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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following : ajuz1k (iq,fare units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states th.c tk8qdb/q n4at the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produs9uix 4p8pk2lv4ga+ zces what kind of change on t4sz2 ipl4paxvg9 k8+u he induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces wtev8;ly k5 sri0g* b4xhat kind of change on r5vsk84tly*;xe 0b gi the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop w.m wn6yu( jcoh4prt; a3z h511lo-+1abz whm of wire produces what kind of change on the inducer1 jnm tblw163 ahh4-.+uyow ozhc( m;pz5aw1d $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magn/yta6ib+kxbk ,zow8- i,eis1 etic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the diqap*ps9.0bd9 czko) hwg dpm5w4) nx 7rection of an induced current in a conductor will be that mwspp9* aqk5)g9wp 740 oxndcz) h .dbwhich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A b ez5-73 zy.othr7rb zbar magnet is held above its center with its north pole pointing down. The stationary magnet induces (zh.-r rzbzy53 7 7ebtowhen viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat xi2n(px ga-/h. 5ygux8 :bsqnon a horizontal table. A bar magnet is held above its /gai:p5g2nh8( xb nuxyx qs-. center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fielsgq8h jdgh/4zf1n2.v d vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the.vd zfjh s 2/4ng8ghq1 field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic,2n ddr8,cqw u field vector points straight up. Thedwd8r ,q2cun , magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magneti9+yuf0bvu( ,fzi:tzf itog *** ihv6 rc field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field dis +0:z*yifvht,gfi*(6vzit uo 9ubr f*appears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-incr b)m)a0s1 tawqacm )+aeasing current northward. Two coils of wire liewq+saca m) b) ta0)m1a flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering xak6a0cf3s6hfirst. As the north pole h6k0fca6xs 3a enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotxez o--( +1lyfcm;ub e df*0boated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mustfb-m*o0;(f +l1eu byx cde -zo be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abo43snz f4 j/4pz,e yxo m(fzka1ut an axis whose direction can be varied. In a region where a uniform magnetic field points st /z(fjsez4zokyfm 1n3 4, xap4raight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.8mcy yye8ac p fmmr0.e; /a51qucju.6 uhd:d .
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that d-x.l4lambsh; (2yt 0bf *wplan $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a ddo0 -sus8;io2gbxy5b 5 e)xy magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved nornz; gyvd+ bp zj1 gi4o(3x7.yhthward at constant velocity through a magnetic 74 ;(hg+.ypxz yo1i g3bd jvznfield that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant 4;p *3vryu6a5cw m zl0k cu 4q;8n voybsq9du1angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator ma55g b.eqh y5transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each sec c0ii8:hu,q etond. The frequency of the08,iit:uc qe h $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devicelkxoi(q +ai(f9*d(-m7 n adh y used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device t*9c/k et1d8+mxzldot n(rlek;z0 (vhg-xq0a hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops n3,7lv 0 hkiif7c;dk2jab :he/vn/qythan the primary coil then it is an vh,kdf23bj;vqn0eii/hkl/a7 y7 c:

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if trb-ki3o.nhhn+gz 7 qf: bu)m+he primary coil contains more loops than the secondary coil thennbq3)r b :nh7hz i.++mgfkuo- it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power icr 3 n)c/;fqeenput

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ( x.q88b0gym)2vqpl xjqbk2fcircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batte/(-t8jw oojy dry of constant terminal voltage. At the moment contwjj-y 8oo(d/t act is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cong9b)u-6 4uwxa -g5qnj os7tfkstant terminal voltage. At the moment co 4k fj-bsxg-aw otu7uq g9)5n6ntact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to a(pl6ft2 2l 6q bykr)smn $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connerp*3 rr n 5dvrchanyjio*,;j gar,09 biz2h((cted to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to ah(ul; j 1) nl/mrbfcn6qzk6 nyeoz86/ battery. The time constant for the circuit reyqj/n 8 fcklbo 6z6rlnzmh) 6( n1u/;epresents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an indut,w,y p+kft bhp8s5 ;dctor are connected in series to a battery. The battery is sukb,s ttp8yd 5w,pf+ ;hddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following hav/:agvv4uzy z+ e the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this cirrg+nz l -wws70cuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supdmi+h6vd,;5yq 95rm f dg.gsh6ysv :dply. In this circuit, the currenrd gd:y sqg56y;hdvs, f5 vm+id.6h9 mt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit c12pm(hyveqzb(9v s )jhanges by what factor when the frequency is tripleb)y1 z(qvp (mv2jhse9d?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, 1 9vd me90dso+hq*vql the inductive reactance ofdsq+9o*dq 9mv lh 1ve0 that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, thev(xk5hmrl y7isp6 o.z9+2 v jf induc z+horpyk vv .j f(659sixl72mtive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC pow*) (epjv3c /h- tsu8ska 6iuvzer supply. In this circuit, the currens ua8s 6 )h/3ctvpez -k(vij*ut

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factorc*.yuapk2fey+m nle* r(tdxj 4 )2p3m when the frequency is trimyld xat*2*p)ye3 (nmjuc+.4 ef2pr kpled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approache dfjj -rc68))qcrq 4lzek7 p,gs zero, the capac7kq, g)ep8r jr-c4)lc j6zqdf itive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase annk;8m5c ifhg 53r, d7o.rjfalva1 z 7tgle between the voltages of the inductor and capacitor in a RLC series circu.fd7c kv3n7ioj5;l8, h t 5mgzrraf 1ait?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an R+a,v03a g2etpc:3s3yseaew u LC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. Th/a:mr .k/mu u;p3ev ose impedance of the circuit increases if R increases. When is this statement:meu/vm arok3./ ; spu true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit ini*hr gn ,rj g:q/k/v,fcreases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance plw5z)g by k+bm-63:*ymjyb qof the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circu) (f kpi0n6l26mrzybuit, the 60)bkimfy(6 u nzrl2presonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by aj,,xnn y +8wjewjw 6rm/k g: zn.ka.* byo4qo/n AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit ocrgg/ir98 nagg:hb zh27c jxpw1,(9 tzcurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifore).koyrcmog p(iu 96;i(8d gfj si)3lm magnetic field of 0.20 T. Find the magnetic flux through the loop l9 i gps j3urdg6(f).(o );i8ocekmiywhen the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of hv5.qwsu x(e8wo88o dv7iu f5 0.20 T. Find the magnetic flux through the loop when the planwu seq d85 .v5wo f7i8u(xhov8e of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatil+ nwqzx;k, 4jg 6v/lgng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop aw+/ l4kxgn lj,v 6z;qgnd the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loocmj, )0lly wm7p is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil4 ichzf(qv k1e*9upiv11 )xvg changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with side(li cqcsa;(vj : j)0/ if5ymfls 18 cm. A uniform magnetic field is applied perpendicular to qc: f0f5)lv(/icjayj ;(slm ithe plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with )xx io;)j5hi esk5,ab 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and areu(b- t mmarhzcs;30 .za $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location ww+v z9i0wr5u - 6sdlxf3:ohbo here the downward component of the Earth's magnetic fieb +f:w 6 ud9wzi s30h-5oxvlorld is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that isc8s*i l jhs55f :a6tbxd(0n jy 2.0 m long rotates at a constant angular velocity of 2.0 rad:nx8f0chsj6dtjia* ybs5( 5l /s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a crossd 0)a60q)faxh) xdwab-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consistrxw 654ap 7ts)nb(q oms of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loz 6 gef1ma,ec-op is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maxiczg-,mfee6 1a mum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire i0zgocy:. 7js of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple( y7e5 si* +k ltm(:fkj tvllt7or4qn p:5*mfm AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotat(t47v*kl*:o r5 +nl7ffsp: mkmmj5eyttqli ( ing coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a ge hnt8ymgt k2)9:ru/c ynerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC p y3b(jjsdxk10wm/l0 motor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a 8h+i4g jsmi) l1nr7tjm8tm c8resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bjmnmgl81748)8 ri tj+shicmt ack $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected a3ubg.uxz7q / adl y;65n3vwo to a 24-V power supply. The operating currnz7. uoxvqygbawl;/ 5 363audent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. uuj )hcc t *t/ 7rsh:0ec1s6qnThe operating current is 1.0 A at *)cj 6h 7t qtsu:/e0chn1rcusfull speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistfs m+/c;1t u:0f fjxdcance 6.0 W is connected to a 24-V power supply. The operating curr:dj ; /tscm0 cuff1+xfent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transfor uj /nph(xzp lgz5d095mer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformezauq4 xctb08ybbji )4hg;n 14r causes 14 A to flow in the secondary. How many turns are in tbt 4)41b0 xqcnayub hi84g;zjhe secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primarybib:9h2f9kd a7kad)t oi yuk 2rr0 7.z if the 24-V secondk 7)k2u zrdr0f7 dyb.aio2 9aibht:9kary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn priitrfvf* 6xtnour9 4u72d i:b 0mary coil and a 2000-turn secondary coil. If the current in the s7vrurb d4nt*9ifox26:tf iu0econdary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in thikvo0vad2w3 *7zy,gwb :dh v 0x+ksr7e primary of a transformer. Assuming 100% efficiency, how manavd7 +7oxs h vv2w0bykg03i:k*dw,zry amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at ci1/yr1plrs6 bk aj2810.0 mA. The primary coil operates on 120 V. rs1pr 68k l1/cai bjy2 What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has gmk c1. .vk( jqphep+iig03h:60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applich(ij m3v.0k:1 egi .q+hpp gked to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns oeo(rlm;:ul) e ,u orxhl/e 0:n-qoy,g n its primary coil and 300 turns on its seconda xlhye/ reu l;,qr(:oooml0gn ,e: u)-ry coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 81z;bd+fx asx,1 r/t1x jtszx 100 turns and its secondary has 200 turns. If txjs 1f8r+,a t;d x11/xx bztszhe input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tuxv( (m dkpuh9n3o n+k4i;xc;qrns. If the input vu(dp x h3 i;kxk4m(+; no9cnvqoltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. I +.kumnqgo,w7-bmq: ff the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectigfm qkq n.b7mu+: o-,wng frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuall6t;lfj2 yysjrz- / )bmy stepped up to z ryj-6t byj)f/m2;sl4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 7ln 0h gkr*18u sc el *yq+7slydoul.,um.p) s60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the tra 0l7 *7hc,+kqlsusp1 8glsy .ldoun u*erm.y)nsmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. rw 1q- nc +a5v/lb7jkyThe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the t-1c5vkyb qj/7 awlr+nransmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total rsc( vdo9wk fw 1j+rh*/:g ytw+ndy8,4lrua + resistance of 0.60 W. A generator produces 100 V at 70 A. In order to re 1rcwd:4o+fs*r+wn/+y,wlv rh a9gtu kd 8jy( duce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resist(e00j(qn9dh1ogxu 1v .qvz4qi4fo+a qb- iw sance of 0.60 W. A generator produces 100 V at 70 A. In order to ro (qdwx1n vq-g9fh4ubia0 s.1j(zq qi04voe+educe energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W litw zq9 :eh / (d-z-z+kiwaso5cne at 1000 V. How much less power would be lost if the power were transmitted at 3000 V insteazdt-w- a :z(oq5k/+seci wzh9d of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line w5nae/ +mhc/ 8ggh,e8t is5isxith resistance of 0.60 W. To what voltage must the generator output be stepped up w mas /nhxiehg8e5/,8cgsi t5+ith a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much ene)y- bccc.n0)j )zjxzw7rgkf6b7o o 4jrgy is stored in the coil's magnetic field?0) o kjcncczfbrj4 wjx.b7o)7-z6y )g

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6. f0(z7v9hz-am*yk1fh8 piv bn0-W resistor and an 18-H inductor. What is this circu0invhz *b7p h-af z1mfk9(y 8vit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit wherevg/dvjl q20f8l4j5 av5:d a9vte/jk v-bw0et the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed x8zk/*lyjlwobab1. 4 into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the larq vr54 f1wa9rzn481f4kwe x cqz 84nw4e5 rc4v19xf rr w1fkamp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V aczy binl. 1i +mp-31vwi power supply. What is the peak current througb1i.il-v+y3mnwi 1 pzh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected x8io , 14yn no9clt5o9xxf(p tto a 120-V ac power supply. What is the power dissipated i(9xx9o y1,l icoo5 nt8tf4xnp n the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through adzc,0n6z:vjb rwie(p qt1+l 8.e j; yj 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistozh)de*p:e v r5 wdj;n6r is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resiwf8pw; x9d a8 58lt20lx eujdgstor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 6wy)xly/-)walae/s5zuc-x cv )2 pt 8 i0 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductivepycw izytv5- b3mb,8qi d;0 mqs (. i+zx/itr8 reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W *ni-ttiv fl ):l2cuwa1vt5x -of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of induca+1dt:p )x dzltive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency ojv3a+zd+uz (qsuhl9(zf; .ijf 20 kHz is appliez vqjhuz(da +;fu 9 +l.s(ij3zd to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to, urgrb7 v1)xwcn 9n1gl:o+c0 kn:) rny3cbnl a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at v;ozjx pa 1 9(7ejbq,c/pi:mx10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reappd5m0l u co tsn1b/8fk: 7he;ctance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a ym7.m- f 8twkri8imh44 plt+vreactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitivan 43j. gwwf-udiik-v)wp (. le reactance of a 0.010-mF capacitor be 100 W?(.wv u--j alpiwn) 4dwgfk3 i.

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?a m ay;jw(vof7 ni b.guz-,c/5

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance36fs ;,c(a fp(tk.mj-kbo e(vmhm f 9m, 15.0 W inductive reac3akfj mpct ff6(v(mh(s,;. om- k9 embtance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W my9o;3uz1vgtresistor, 20-mH coil, and 1.0-mF capacito zgty;uvmo3 19r are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resqhqi7zwhz4 oq ;2759vioz uu4u4)lb fistor, 20-mH coil, and 1.0-mF capaciqzbqv7hz)f 2u 5luo44 z hu9o4;7wiqitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mzf1j7lw4e :fdib k6g ) d(oc9aH inductor, what is the impedance at 1000 ba idfelf4:go d1(w79z k6jc)Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series,dw ;b0pq kib3 with a 20-mH inductor, what is the phase ;wi30bb p, dkqangle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mFayew6 :,xug,h capaci,6wyhe :,g xuator for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resc.vwz;8atq)xd:/pvg d*s w n*istor and 15-mH coil to get a total impedance of 110 W atw8*px /) dc *;a.:vgnd tswvzq 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in serido)pg xa*ard/3)mi. 33 ;tfbie +ufpaes with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?fm.oda3f +ugd*eai )3 x /p)iatbrp3;

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor atp.kk)ql)/ i1f2 5 rsg(dpzp:5hymed s 1.0-MHz for a total impedance of 150 5gyz q5 dpkl:2 fi1s r)p)meph/(.dsk kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacls2d 8(6tuu xxx i5yc(+ 0tdzgitor. What is the impeda t(xsx06lz 8+gu(d i 2ty5uxcdnce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capa/ t5 +aqv. 4dcykblf0hcitor at 1.0 kHz for a total imqdyf/ .h av+ctk0lb54pedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series withm dq*uh1/,muo5 rjbc39k rvv0 a 10-mF capacitor at 1.0 kHz for a phase an*ruoj/3 vdm, 590qmv u1cr hbkgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in sersetb -5o)tmunr6 ad2 /ies with a 30-W resistor at 1.0 kHz for a total in5t/o) a-2sumred b6tmpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is *7 eeokvw;d7lthe phas7v;e7owe*l dke angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 x,rf oar-rwr/: 1o b;zHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie;xoa-r1r,:zrb r o/fws?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit ci+ +vppb,o 7z+)jvf uconsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H induct7 pb+zvjp+icvof)u+ , or. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacdpq8,t1yu l m4itive reactance 30 W, and an inductor of inductive reactance 30 W are connected inpd,yltu q41 m8 series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle fugv1s j 2gkrcb +l.4i8or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powerr2gvjg ulb4s+ik.1 c8 supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resibey1:rm:hn55 svmtc n ,t6gvrj9o+no49zg p ) stor for a phase angle of9 vsy5 ng+tj:6 m:4o,ehznp 9rtc1 )n5gv ormb $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.z5: 4-t-kj b a2xhvhuq0 mF. At what frequency should the circuit be driven in order to have maximum pothu5zk:qa 2 -jbx4h-vwer transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in anceyl ;noy9 +8xar6m( gh tqv5 +7cca7b ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conn+lx g8n; q6 avm(ca9b yth77coe+yc 5rected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isbcw45/o4k zm)cr 7v ft $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W a;e7tuech/r,w,g y5-yzq h j) rnd a resistance of 30 W. What is the power fac;7 uj-, hyqt/ e,zw)er5y gcrhtor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC c5wmd.hx*n2/wvhj -b iwh,y;uircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power bh5vwhumx,. j*yw;d /nh2iw -supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seo :4l0 g(hg 5kch3sxycries?o 4gsy(5xg hcklc30h:

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a r5lj )ygh3 hd5sesonant frequency ofl3y)j5dhh s5g 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a lw8u948yoh mvid- /4azn ckukt t930m3.7-mH inductor for a resonant frequency of 1n dho0maym8 44v ktku9ul/ 3zi9t8w -c000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a b xh2m e8k+bu6a3 gv2v3hdwm2 30-W resistor and a 40-mH coil if thea d8m+3h 6wb3uvhgmk22vx2e b resonant frequency of the circuit is to be 1000 Hz?

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