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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 are units of magnetic +w6lwh0a gklluz* o7v gbh/ft-k9y3/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 that the *hzgixcjo*9v y, h z0 8dkxk2x9qz;-l$emf$ 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 prodr 2gkv p6g km/3z1(ls zr.2yrmuces what kind of change on the inducekpz/6zm. vrrrlmg ( k3 y221sgd $emf$, 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 produc*j7iyf/o53szde-7k 9d x vpo3idrp g:es what kind of change on 3dj oo yp37igr-f /sd7pv:e*z5ikxd9the 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 of wire produces what kind of changfr9w ,v wga,3re on the inducevfr,9r w3wg a,d $emf$, 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 magnetic field ann2vm9*6fl h*yryg2o b $emf$ 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 direction of an induced current in a cond nwp0j3m+w-*i vv +qtvuctor will be thatv+-mitv q3 0v+wjw*n p which 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 bar magnet is held.ui:v(, 7btkhlgs5zdp/9 p pq above its center with its north pole pointing down. The stationary magg sz/hbki ,9p7pqlptdv 5.:(u net induces (when 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*8aex yu14qts0v jt r+ on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from u0v+t 4 x 81jqstya*reabove)

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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 bx+f(o3 pozp v ;-rai9field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil z -f+xabv9;opoi ( r3pas the 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 pvng7z) ap(c0n18p ts level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil8p zpn)7an spgvt1( c0 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 magnetic8d9 uzevcm9v) q ad55c field points straight down. 58vd )qv acu99czed5m The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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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-incr4lo3dc gc/ n9ao:i;rtvl 37bgeasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circ b9ao/l r7d:g gncov3cit;3 4lles

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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 polehhs/ t/g:(9ko5 crhsl entering first. As the north pole enters the wire, the induced current will be (rhth/9(:lsgs oc/ k h5as 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 rotated at constant angular speed abou9 0 q xqkdpv)w9-rk ;wt:zdr0gt an axis whose direction can be varied. In k0g;pwv dkxw99 :rq 0t) r-qzda region where a uniform magnetic field points straight down, what must 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 ajq:7rc)s;y irngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be )q;7c r:j isyrthe 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..a q6nwqdlck g,dp,bap 5r.8 -i( (arc
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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 an zztqm,kyz d42 4bo4l7$emf$ 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 magnetic fiem2g lz0tpi;gw jut0p- 6 aiij :29ee;fld. 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 fih oot *3upu):c18afnorthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrosufopfctui: h8 3)*ao1s 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 barxg( mgr8o+3 hs rotates at a constant angular 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 generatov;2030n tgracm5c rmmt;8glqr transforms

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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 revol ,kh(u6gx jho(utions each second. The frequency of the 6(k ju (gh,hox$emf$ 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 devi :o-l);)w2bcu4j;rrfth jipp ce 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 )a 2c7jdffna3that

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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 mor k7u7qjpf,v,o 3vsq3 he loops than the primary coil then it if,3v o 3,jvqspukq77hs a

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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 the primary coil contains more loops tha6cr l:j3tz5bw* j)yfg n the secondary coil then it isj:w56b ztjgr3fy l*c) 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 po)alg94p5 ;4bszi dbn mwer input

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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 circ t4a8k3yf)tbelt7c- kuit,

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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 idz1zll(h x0g/i 2rt2b(j7jfrreal battery of constant terminal voltage. At the moment contact is made bhir/7z1 rl(rl(fxjt2 2zj0g 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 co8wkwk. .6v udv*.idsynnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thed68wivs. kuwkd .*vy . 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 arj6p8 dau51v-jp 0agp nd resistance R is connected 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 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 connecti-;ibr wrn 9txt )r6j0gwhz/9ed 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 ct89a y5ivf(8 cpyp+z+x,nmghonnected in series to a battery. The time constant for the circvp+n zc yypat5+ihfm9, 8xg 8(uit represents 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 inductor are connected h1d2(*j myxktt-m7nrun1e3g in series to a battery. The battery is suddenly removed from t7t-mj3h(1*gme2 ydrxu1nn tk he 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 have the samh n7;0d0gf*sd rwuro1 e 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 circuit, the currentx3squ)7 qrs 3f

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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 supply. In this circuit, the cu/7r07ibp0agq11,, kfunobuscek fb 7rrennqb riescgu /0f7 fkk,01 7o,pb 7b1uat

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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 circui9 sc q rt6k9vul,nhjt 1w2 f)/20omkejt changes by what factor when the frequency is t/v9 hjur6ql 19),k2j n20mc ttefkws oripled?

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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 v-:a 5;hqbx mvf5ji8rthe AC voltage across an inductor is doubled, the inductive reaj;8vrahv5x:bqfi -5 mctance of 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 apo*,bcf;pl: q m)jxzde 0wq6(g )iax g/proaches zero, the inductive reactance of that 0 gjoa f(xc )qq6e:,bd/ p;m*igx)lzwcoil

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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 connect7ihsx5h zjw ct7e 65an7pvi/ *ed to an AC power supply. In this circuit, the currewia6 zjhhxvi sp*55c/t e77n 7nt

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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 wq-ncq;n v7l 7ac circuit changes by what factor when the frequency is trc;w7n nq7-v qlipled?

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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 approaw22k0uz1zo ec/ zs3 ouches zero, the capacitive react 3ucku10oz2 swzo2/e zance 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 angle between the voltad.4,arm i 7ud,dgtr 5dges of the inductor and capacitor in a RLC series circuitdgu d d.dar,i ,47rt5m?

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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 RLC circuit is defined as cc d1dr5+e9 utyl c16u$\cos M = R/Z$, 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. The impedance of tht dyzsfqp2+liyj*k5*h 4 dp .+cd;r .se circuit increases if R increases. When is this statement trueplyrsd2.+ yd 4tpfcq *.+jzh i5 *skd;?

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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 increases i7 z80xowez4bjdl .- bif $X_L$ 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 impedanc f4(mzbnqf: n*e of 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 tw--mq:7i5 4q ty1d v/tgo ujewhe capacitance both double in an LRC series circuit, the resonant f-u4vwt:eq/ dj gqty1 o7m- iw5requency 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 7(n8hmay)h+:, fl bmrg3jvol by an 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 cug r :5b.js0:tza9 crfircuit occurs 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 zgq4mm+h:u( uuniform magnetic field of 0.20 T. Find the magnetic flux through the loop wmu qzhg+4 um(:hen 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 au .5p1- fov9ecgdi:by uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field v.9c: 5d bu-ofpyegv1i ector 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 radt)i7np 0egahs1s 7 irn;h 3g1sius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiel; 7 ra3 h7)si1ihte0n gssn1gpd 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 singl e+x1-izoqh sr; b8s)ne loop 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 coil chpwngli (yiif9 2fzgq7.4 v)3a anges 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 squi.l-b( uc ;spu;c,l) a of6wnyare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fsa lb.c)-yf ,;;ocn iu lw6up(ield 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 15 turns and an area of epyt y0w 3 7/qx27ccss$0.40 \; m^{2}$ 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 dj7 m89ef;rvn kw ep7+area $0.20 \; m^{2}$ 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 ;mn*op0d5 rr yvv,owsrh ,r/(where the downwa,,( rrpdvhrw5y rm; n0*o/svord component of the Earth's magnetic field 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 is 2.0 m long rotates aefq1)vh3:p*g0q u5x7w rg mkjt a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic k)g *7gwqvqm:01 xuepfrh3 j5field 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 cross-sece++biv-k ywxy;lt69stional 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 consists of 10lx :ae)+ ge hag05vr6c0 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 loop is 12 cm xz3 i)hwk 3oy)long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to th3)wxkh)i y3z oe 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 maximum 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 of areawqez 9x/ ax0p) $0.090 \; m^{2}$ 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 simsd0ec8;ige/ hple 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 s /8 egc0die;hthe rotating 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 generator with a m12hvqw6v 9n1uub b0r laximum $emf$ 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 motor have a resistance of 6.00 W. The motor operateror.;( ukqfgnml0 +j,s 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 res.9nuvmd whke 7 tu:l3 81njb3kistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a ba.uvd1:huk m ew9n 3ln 7btj38kck $emf$ 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 re5;vjdyx8v e s22kac:esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. a8 5see2k v:2d; jvxcyWhat 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 ve, etk/ozp2d)w579ldnn ,qga 24-V power supply. The operatio7lpd/) ,enn,tkweq92 vdgz5 ng current is 1.0 A at full 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 resistance 6.0 W is connected to a 24-V powe.c:7mehg 5(+45s csey cnfreqr supply. The operating current isec:ne4 r7(f yc.5mgs cq+seh5 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 transformer is needed to reduce a pr apg7s5ou5b + qi(dohme (83owimary 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 tsmlpf-,7cj y: ransformer causes 14 A to flow in the secondary. How m7yslc - f:jmp,any turns are in the 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 r+.u. h2 mml 9z0pvw+h5etow iin a 110-V primary if the 24-V secop.2e twh9vmio5u h+w+ m0 lrz.ndary 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 primary coil and a 2000-turn secondarya2.nk0 7k wl2dlj.ijg coil. If the currennk a l720jwjklg.d2.it in the secondary 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 kfwv/ a+ r/dk-xnm (9 9vn)em ezc4m9vthe primary of a transformer. Assuming 100% efficiency, how manyvm-fa e+cknv4/m9kwdr e 9x9(/nvm)z 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 10.0 mA. wj8g 7g)gbxr4hj:7u/ w cp mx8The primary coil operates on 120 V. What does the primaryw4/gjj787)pg gxcxmwurh 8: b 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 60 turns on its primary coil and 3 d4w7t wy2s s6d9qjg ;k:3lkuz00 turns on its secondary coil. If 120 V at 2.0 A is applied to the pri u qdytzj2;3ws6dsl74:gkk9 wmary, 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 on its prim th/h7u vcpk-vv(ev) /ad (mj*ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what c- (pv*)hvtu v(hmj ake 7/dvc/urrent 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 100 tur9ablftr)h n1n: uag:( ns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondu:bgafr1n)9nat:l( hary 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 transforme0n-vex/2oeopd n .4n dr has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of td4e vn0x-noon ed2p/. he 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 ha:z)u( fyxss mk4 - t6wlba6:dvs 200 turns. If the power input to theyw(-lfxk t6:mz:sb )vda su46 primary is 100 W, we can expect the power output of the secondary to be (neglecting 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 usuag4,z g6 lcrx)oxmkpyx f14 x;ld24d3 z6du/ belly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.;/cz,g4lf xdx ky) om1 3d24blgr6zdue4xx6p0 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 60 A of current at 120 V. The voltage is usualf05/ i y. p*peo 9sh-.rmornqply stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Findpepy9r.fm n5ohps o* -iq /0r. the percentage power lost in the transmission 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.aeql 7x.:gbk6 The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 legkq .x67a:bW. Find the percentage power lost in the transmission 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 resistance of 0.60 W. y3lhc j-ecw6f b 51h-b A generator produces 100 V at 70 A. In order to reduce 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 usedc3b6y-bwcj-5lehf 1h ?

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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 resistad-kdpll5g: )geh,u )y nce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss du:ly)-kd) ug e, d5plghe 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 line at 1000 V. How much lessku* 6o77t:nbmppwpk 5 ag ix7: power would be lost if the power were transmitted at 3: 57gp u*an7:7wppmtb x6ikok000 V instead 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 ; +9.iesd(7 cfyzozp qs4y*azon a line wiis;z dc.fs 7oy4*zy+(aze pq9th resistance of 0.60 W. To what voltage must the generator output be stepped up with 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 carriesyn9mg+do p5 8m a current of 5.0 A. How much energy is stored in the coil'yon89g5+md pm s magnetic field?

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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 contprn82;ej h7c w)9b1zzmmi, boains a 6.0-W resistor and an 18-H inductor. What is this circuit's timecm zwnrb7pie z)hj18 b;mo92, 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 where the rms vldf 4:5z4s8rmh zb.nj oltage 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 into a 120-V AC outlet. 9iwr5 8j,zpsg 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 resista9.ak5 ce.:o(t6 qmkb zhdxn( vnce of the lam6hcbxkk.me:ndt9. v 5qao( (zp?

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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 ac power xu+2ii 5wux-m/qpzq7w* ;eay x).)i* av tycwsupply. What is the peak current through yzi2 y;p5t mu.* v7qawi +)a)ux qcxewi-*w/xthe 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 to a 120-V ac power h zex 418e2bgasupply. What is the power dissipated in the rezebehgxa814 2sistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisl .-pb (brkyzf/fby vo 1(63f 5wph2djtor 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 resistor ierbeok1 (3if)f9 wx, xs $I = 0.80 \sin (240 t)$. 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 resp;*bzbp o ccpl9m 43kn6*rlm+istor 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 indu ytuq6sdq1yvx 74+b6 bctor at 60 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 inductive reactance of a 2.50-mH coil at 1-xx *xn tl9ll)4x dci-000 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-i0c-b mdz / lle(1ko:8ijrkz: 0u0wjn mH coil have 14.0 W 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 inductiv9ip6* 6 qu :t x9wcv:x:gzmbkae 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 amf4+t.f8uq xaiiae+ eo4*4p h 60-mH inductor when 120 V AC at a frequency of 20 kHz is apeaf h.m e8oxf4+t*4+i ip4uqaplied 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 thr8hsts bb j1x4*9 b;xc8wh7whj::ev5mecqy f6ough a 2.50-mH coil due to 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 10 9r.wdtvsy:b cs*48 tn 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 capacit w6bp*1px6j b1mw.cl sy5,hj1p+a bsaive reactance 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 reactance of 1i9rx o e/q st,rnc-)wx1(fm pb 10vfz(200 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 capacitive reactance of a 0.010-mF caw3opx.7 0h yc4ok: cdopacitor be 100 Wo4 3o y7cphxcw.o: d0k?

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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-mFz3svw xg4sf69 capacitor at 1000 Hz and 5.0 V?

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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 ov)kk gbr4;s)af an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c;ra) )gkk4vsbapacitive 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 resistor, 20-mH coil, and 1.0-q7zrc6 zp0k (:(d ukymmF capacitor are connected ikcp6yuz q 0:(dmrk (z7n 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 Hzv s52p4k vh5(ghnwj-o if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conns4on5-vv(h2k5hpj g w ected 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 series0/8wk-cc1 ewhala qi- with a 20-mH inductor, what is the impedance at 1000 Hz?hc1w-w/e0ia-a 8c kql

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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 with a 20-mH inductor, what is thzsu)33, s0+wvsze agoe phase angl+sg o33s0ve ,uzzs)wa e 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 yytm7df7bxx :, bfmj1pkb.. : a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at b:7.,y7 yjfkpb mxt. 1fmx: bd1500 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 1c ixq*fo6:t7a 00-W resistor and 15-mHt*ax6of qi7 :c coil to get a total impedance of 110 W at 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 bezrdg;s5 .t6pd put in series with a 450-mH inductor at 5000 Hz for a togrz; .t 5sdpd6tal impedance of 40000 W?

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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 axu(dwe.*60jjk *)dgk1yt qo put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?jeqyka.*k jg)1 6 o0tdu*x(w d

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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 s2jl *o:1 bbm ep)ib)x) jup1kmeries with a 20-mF capacitor. What is the impedance at xej p) )1b2: *mb pujom1ilbk)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 iifr*q 5m5sxy9.rd c ooc .jx0893hlfa 10-mF capacitor at 1.0 kHz for a total impedance of 0xh5m3 9jd*5o qf. r.cociyfxi rl89s45 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 with a u:4u: qkc-gax10-mF capacitor at 1.0 kHz for a phase xu4 c gqu-:a:kangle 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 i 9c.d5jvmh1eby; f 9pen series with a 30-W resistor at 1.0 kHz for a total impedanccfvy e9pjhb;9.m15ed e 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 12mf;v *9lga*g u0 Hz. What is the phase angl;*9g vagflmu *e?

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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 Hz if a 100-W resistor, 20-mH coil, and 1.yk buslkh 9hc5. b7s;9 je pig-/od;*k0-mF capacitor are connected in serieseykjk9/ cib dk h7g5b9huls;*p;s.o- ?

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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 consists of a 100-W resistor, a 10.0-mF capacitor,jfxxotkuo :6jtycn t4,hck1;-*vkl4i, * id/ and a 0.350-H inductor. The circuit is connelo6-ttk:1 u,4d t *yojn ,viikh*kx cj4xf;c/cted 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 capacg)2- hli.xvqearhg/o, r (x(4 yrt *txitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a(.(thxivht r/x,gl ) exyror-a * 4g2q 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 for a series RLC circuit containing a 50 znyr3v9y2 rgti6 i+.q-W resistor, a 10-mF capacitor, and a 0.45-H inductor, i r+vtr3.qgzi y2n69ywhen connected to a 60-Hz power 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 resisily ;koo4a g ,hu+f/2vb+rk: vvgiu 8wx5a;4htor for a phase angle o our+ ky84 vv: hiah v2+oulfg4wx5 gk;bi/a,;f $40^{\circ}$ 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-v 3au(wj. jub3mH, C = 10.0 mF. At what frequency should the cirj3(w .3uavb ujcuit be driven in order to have maximum power 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 i. sht4k:ce fb2n an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reb:te4k 2f cs.hactance, when the circuit is connected 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 is (z1jmi8xpu a+$63^{\circ}$. 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 60yvqp(2u ax9*re8ku c 81i;d fd W and a resistance of 30 W. What is the power facuif8(*;vdr u98yqe ax1kcp d2 tor?

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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 facv9 , 4b; x0)bcnrjcjowtor for a series RLC circuit containing a 50-W resistor, a 10-o0 4 bjxcbcj;vr9nw,) mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power 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 ;do tcb7 o/d3vqr,7gycapacitor and a 15-mH coil in series?o,;v tr 3/ddc7by7oqg

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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 92gj8idefvdy slr.-:o ylnt 7c7bgca, n2 p 1(resonant frequency ofjfa.p-192ig 8n,gclcl2ny: y b7rve sdto7 d( 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 v+tvky;xi) 0sin series with a 3.7-mH inductor for a resonant frequency of 100)i vy+k x;s0tv0 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 be4:ky xvq9 1ypzvv(t; u placed in series with a 30-W resistor and a 40-mH coil if the resonp:9v;yqxzvk(vyt4 1u ant frequency of the circuit is to be 1000 Hz?

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