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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 magneticu +0c1ta jom,j 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 thau *fl v75* yxw/iz muyuw8/5tit 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 g50xlsa. q3c k,yvsf +-xs3o1af9rj8z v9borof loops of wire in a coil produces what kind of change on tkblq 93xa g ,rz+s 3-x9.sofya85v vsf0 coj1rhe 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 magnet5c946xw skvi4lf+kz gic field through a loop of wire produces what ki gkvls44xikf+ wc9z 56nd of change on 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 loo ycb vefn;t-gp ,+kc0;sjre;:p of wire produces what kind of change on the induced 0;b +e:cey;pc v-sjgktr, nf;$emf$, 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 magneutd h +23x0n:qba be*qtic 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 direction of an induced curhv+t a (gvt3i,rent in a conductor will be that which tends to produce which of theathv vt gi,3+( 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 magnettu57qw ,sn*)tdkdxaf d/ 1ay- is held above its center with its north pole pointing ,aqnsd)51 k w- yttxaf7 du*/ddown. The stationary magnet 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 on a horipxfckej iv)g+jp h8zw5d .h(b9c96b7 zontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches twecb5j8x gbc6 pvd9i+)h zp7( j h.k9fhe 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 tay:k0pc(ptlfo x2gk u +.;b(ib ble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the ind k(ib(b2+ txcfou;py g:kp .0luced current in this coil as 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 level table top in *hn 8x 6) zum(pbqa cuw*i )/lta4rq6za region where the magnetic field vector point*8 a 6) lqm 4ib)xa/qh*wruzu(6pcznts straight up. The 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 horifwd( p/p auqg 3q y3m42o ytb,sgfjq.2: qx64mzontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directioq43, gdfyowbfmut426 ag3sm2qjp q/p:. q( yxn 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-incremqrre yt9 +o/ip;tx(: l1v8cmasing current northward. Two coils omq (c/r8ivyx: tm9; p+lre to1f wire lie 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 y3zqho *3b .ksmp)w r0with the north pole entering first. As the north pole enters the wire, the induced currep 3hs0kr*z wq.o )my3bnt 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 rotated at constant angular speed about an axi822 /jbhzxpw6qw mbd9flu5hlh/ ;v, v s whose direction can be varied. In a region where a uniform magnetic field points straight down, what must b2 5wv2bj6,hvph8/ udm /9lhqlxfb;wze 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 w9;xc uke0:to: yn7iuaire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wh ic:eoxu;tu7 :nyak90 at 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.ojb*f,rak esky.vr5c/2 w / *jayv /i-
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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 tbked*7f25 zdy(g8 b lphat an $emf$ 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 f*,5 xq yduy:orield. 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 jp qw83lnm n8 t,(gce7direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential i mtngel( p73,cwnjq88 nduced 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 atk gvl fc /.udut 9rgh(/7z8k /k:qnm2p 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 generator 3kaf;04 zf-d1gfgk yf 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 revolutions each second. The fad3 9m 6thcrm4requency of thc36mam td9h4re $emf$ 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 device ul(/vvfwy+thowo9 /u6 :m3 efxsed 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 deve2wfq2;f 7imed/s4zy ice that

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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 containul wkp0y.6ma 9s more loops than the primary coil ta0mupy6 9lkw.hen it is 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 cote 0ier yz3h9w;r7g q*s tg4i*ntains more loops than the secondary coil i q3 rg y7*; httziwg90*rse4ethen 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 e;a l0xpt5v;) bfdqge*.we3w 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 circuitmiu ew7(lax t:4d,1hr,

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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 idea 9y2iha cjg11aog2qh; l battery of constant terminal voltage. At the moment contact is made with the battery, the voltaa12 ih jogy;a9 c2g1hqge 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 connectoh (iwt*b4w :bed in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, t:b ww4it*b( ohhe 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 q j,bqv xf/6.cqn0;s zand 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 inducts0vzq sf*dgkx-+i . /wq 4rc:xance L and 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 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 a batmd gmg7hcx m30g *5ol9tery. The time constant for the circuit represents the time required for the cug0* d7glchoxg9 3mm 5mrrent 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 conqqm ai ovi)p6628 (b(tn ay tk-sp9fh8nected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for apt2y)oh b(f nk av9qqt8i-s 8m p66i(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 same units excyyws4.oq ,lwa(5 g, lyept:

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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 suhsr.go pr.k:j ll +3/zpply. On this circuit, 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 connectedih1w yk xf :,u v;yl+*xa)c9wu to an AC power supply. In this circuit, the curren1aulyywc,hfxv:* ;)ki+x 9uwt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance 2cb i0s-j0ja /* juqgiin an ac circuit changes by what factor when the frequency0i ajg/ s-* cbuj0i2qj is tripled?

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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 d, s 4ggu,zd-enoubled, the inductive reactance of that indug4 ,g -uzse,ndctor

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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 :yqr1.,-- 8 -kwmdtxs m swfchthe AC voltage across an inductor approaches zero, the inductive react-h.y cs :,mk1wd s m8x-qtfw-rance 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 power supply. In thimmk/ e)qzoe2 -. ,xrdbs circuit, the currento,bqk .)dz-xee2m /mr

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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 factor when t96,ofj: t-hbftc ct:t he frequency is triplej::f 9foth-cct t,6tb d?

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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 ACt:8r0m /;rhkd jlmpq: voltage across a capacitor approaches zero, the capacitive reactance of that capacit ;rtj/m: dr8m:kph 0lqor

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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 voltage8 dvr g-*vb* qh-jtvb5.ay3a7.qz tyjs of the inductor and capacitor in a RLC series circuy5qt7vdza hvtr - yj*.v-ag. b8j* q3bit?

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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 do;o-b4 w3glxt efined 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. The impedance of the circuit increases iftfk*j8s**c f f R increases. When is tfsjc *kf 8ft**his statement 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 th,udd2)6 ozoko +e 2cqhe circuit increases 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 imp2tv xf cka,j )3ira*ur-(,fyk edance 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 the capacitance both double in an LRC series circum3 gf aq -to,c2pak117wclxg6it, the resonant frequency oftcgcka xw 12o71,6lfq p-ma 3g 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 thzo v dm5gfdoqas:i3d7()l+p *8ojog1 at is driven 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 RLCkn2m3zqxpnuz po ;iq6+* b:t5 circuit 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 rota5 ,frdcx4*-cwyncbb1q f m yln*:+2so ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through,lcqb xccnn4ym:+*b2y5f*r dow s-f1 the loop when 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 ofmmv0 h1 -u+kvo)dvfy: 0.20 T. Findhduyfm:1m0+ )-vkovv the magnetic flux through the loop when the plane 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 rotating in a uniform magnetic field of 0.20j1*mbdg mck4h7g 0f)g T. Find the magnetic flux through the loop when the plane of tbm*jh gm01cd4 fkgg 7)he loop and 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 adwpfoeay-v ep/cui: *rw847.e justable single 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 coil2clo, oj7 *vq*eif;m h 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 turnjs.a 9(806pnhuo utcys of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of theuuc .t n0p8 9sh(j6oya 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 15 turns ah15+r,a psxj 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 area sksu) u o/*d: o9vq-k jt63aug7v pot($0.20 \; m^{2}$ 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 msn .55nts 6 -sag:xsxy flies horizontally at a location where the downward component of the Earth's magnetic field.sx sng5x5ss6 y:tn a- 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;+korv7euf vys; w2(d .0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of i+y sr(fudvk;evw ;o27ts 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 ixl4;qw/e .ie4 cn ;hneh4hrmuu//t3has 50 loops and a cross-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 consists of 1:djoo* o8a i/b00 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 w1t7kf+i cqh3 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 7 c1+fwi3 tqhkis 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 j4 7(is9t1ll me h glk3om:x0uwire 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 AC geneni5ot6l*h;h ),mhg4djv :wtf rator 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 rotating coil,hhgnhjt4v lf5o);t wi: *6md 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 gene308drlopmg7 5o )gpic os;lu9 rator 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 motor have a resistanct 2pfsb6x4b.l,b vet0e 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 resistance of 6vx u4t*ad(9o g0pzg543 kkjq +da(-mkwp/ f mp.00 W. The motor operates on 120 V AC, and when running at full spee+0 9j xm3/f5p o4mv-tzag((4* qukkp pwkgdadd it generates a back $emf$ 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 cot; 0 o2i2cvijznnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up ctji;i0zo2vc 2 urrent?

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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. T g0v;bljoq1.s he operating current is 1.0 A at full speed. What i1s j0 qolbv;g.s 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 +i+ n.)/6/ l qbu oqhh adpgag3ad-9oeresistance 6.0 W is connected to a 24-V power supply. The operating cb hh)6nopqad/3d-gqa gl .+o +ui/e9 aurrent 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 transformer i7bu u, 2z3hamtoqqp*m*se( v u 2(m:qps 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 transformer causes 14 A to flow in the secon0a0 df5gwhe x)dhe5df 0)w0axgary. How many 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 necessaryfucafrmqq; s wkj2)x ,8 /us4i;d dh-) in a 110-V primary if the 24-V secondary has 100 turnxu dw )h4;;s2cruq/fj ms-8ikad) fq,s?

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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 secondary col ycsj x+g;yxh)w*c /m 56ph0:rwimj3il. If the current in the secondary is 3.0 A, what )sxwrj wl;0 :cj cymph5y+ *3 /hg6ixmis 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 the primary olq3 a;o(2wfgv)ji 1 xyf a transformer. Assuming 100% efficiency, ho2qaj3x g vyw;)i1lfo(w many 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 s *m:btylxsfu+ .o;tg/ign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doesm sugxft:t ob*;+ /ly. 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 60 turns on uwmq 5u/l8:t5).we emz aio 9qits primary coil and 300 turns on its secondary coil. If 129iu/.q 8qomwmtue:z w)le 5a50 V at 2.0 A is applied 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 sh/y(5eu 02d;b8gircp6hadb has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what c 0;g ic/ pdd(a25shyehrbb68uurrent 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 turns and its secondary has 200 tur.7( ly eexxtozti2nm 0 0xaj2- )*czdyns. If the input current at the primary is 100 A, we can expect the output current at t mx.20(-2ta cd ex)oxzyit0znel*7yjhe 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 trawg -q:2 imrd7unsformer 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 the secondary to2:i ug rw7qm-d 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 tu -l ywwd1cf5c4rns. If the power in cy4ld5f1- wcwput to the 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 o7 pie tn2rfdp p.p4:;is usually stepped up to 4500 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 pi pe.t;on:pf4 d7pp2r rimary 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 .08j-ol n5yvzsvv (aq/ale 9o. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistancej/9ze.a n aos80qv v5y-o(ll v 1.0 W. Find 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. The voltage is ab ie9 34:tr)mkaw8 zqusually stepped up to 4500 V by a transformer and transmitted through a power line of )m 3a:9t 8ai4ezqrwkb total resistance 1.0 W. 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 transmissiongsi d0*ra7ys : line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage i 0ag:sris7y d*s 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 resis9kh f6hud3i i:54zr nk-*rc lstance of 0.60 W. A generator produces 100 Vk653skf*z-ri4 rh :cindl9 uh 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 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 less power would be 5pn 2gs 2;yv8q3p koulahq;h0lost if the power were transmitted at 300; qq2ngylo;kauphvs530 82ph0 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 generato.l0 u(tvqji d*1nv/lcr is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the p.l it0(/l* q ndvvj1cuower 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 energy is sto q(v:1/gzsp h0k y16ftn3qrf kred in the coil's magnetic q/f nkqyh31rt6sk1 v:0gf(p z 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 contains a 6.0kh.ds y9 +i.nt-W resistor and an 18-H inductor. What is this+h9yknt sid.. circuit'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 where th;zam/zpa12 hx e 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 into a 120-V AC outzz+wr)0j l, t4uy sy5g/7shu qlet. 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 resistag8sx7e;-n maru z kw77nce of the lamp?kxz;7nes8m w g a-ur77

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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 supply. What is the peakhgj-n*vydwqi 5i62x , current through the resistor?-2g j ny56qdihx *,wiv

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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 supply. What is the power dissrx*k/gv n3 vy/ipated in th3*kr/yv vg/nx e 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 a 50-W r: )dv(ahjh+m u, p( aubd.nx(xesistor 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-no: m44miqmz2W resistor 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 resis /j3 )vfs2cjv ofb7n:ktor 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-m yx o)gp:8h h-n6wfg 4ob)iw8tH inductor 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 cor4rufm . m-(4am ia.mwil 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 have55u5 i lpv.fni 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 158yq*ar t4c gh4:jmh1g7 W of inductive 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 ro4byxe8f ez(- yad3 1when 120 V AC at a frequency of 20 kHz is applifdzya xrbe(8yo-43 e1ed 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 a 110-V, 6:0mv:q x0(axh nysm;y 0.0 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-m*8n; vyhye-yi F capacitor at 10 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 ou: nf7 h.b2mr71worqto have 50 W of capacitive 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 reactasci tkyh42 )8unce 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 capacitive reactance of a 0.010-mF cs *s *k( (ouwdglw4z4g k:wtnk4i( yl*apacitor be 100 W?*(:io(lks4 4y w4 *d ggtu*kk snwlzw(

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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.*g+g1sgtyqsvccvj ). tz8w1. 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 of an ac series circuit with 12.0 W resistk-z+gbd pr:7hance, 15.0 W inductive rrdh+ g-7k :bzpeactance, 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 resistor, 20-mH coil, and 1.6 tv o63px 1qqj3scc7x0-mFcx 7v6xjsocq 6133t qp capacitor 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 atl9q. /q uxrhts+cnxw wh-+4h , 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected+4wns/l-uq h ,9wtx+.chxqh r 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 conosi d*igmvt ,uev;1/7 nected in series with a 20-mH inductor, what is the imusv v7i,/;m1egtio* dpedance at 1000 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 with a 2v;m)t)phnw3u hj-t m2 0-mH inductor, what is the phase angle at 1000 H)-2 u ;pnmh tvhj)wt3mz?

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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-mF capaczvzrn-jl2z *:w5zu2mitor for a total impzwv-zz 22mj*:rlzu5 nedance 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 needef h;,e9w vxl*xdq3+laa(* mnqd in series with a 100-W resistor and 15-mH coil to get a total impedance oa *3an;wlm+*qq (x9led f xhv,f 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 be put in series with a lvu:g6e 1ec8h-rpr*xn0d4 b )xtwa5 e 450-mH inductor at 5000 Hz for a total ce16:xp0 *dt erg5he a4-8x)lvurw bnimpedance 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 put in series with a 100-kW resistor at 1.0-MHz))gmdij vv uw5z t39j.1yxj j8 for a total impeu3wjg d5xtvv) yjzj9. ) m8i1jdance of 150 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 capam5 wyns3d-ugjh8a ,m+ citor. What is the impeda- uw ,h+n ymdgj85s3mance 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 capacitor at 1.0 kHz for a txoxs:5(ie8vv : .i+m zo1eycz otal m8o 5+eve1x:scx.i z iz:yvo( impedance 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 with a 10-mF capacitor at pi1 (e-e2fhjb 1.0 kHz for a phase anjpfib2 e h1-(egle 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 n f/r0w5i8dbi qeeded in series with a 30-W resistor at 1.0 kHz for a total impqbd/5 r 0iw8ifedance 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 o9:/odkv gzdmf17z a5Hz. What is the phase angl1/za 7md gdov:oz9 5fke?

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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 k n4jq .4dsu.lif a 100-W resistor, 20-mH coil, and 1.0-mF capacito k.dl4 .qnsu4jr are connected in series?

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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, aet 3hzvi-m+4;x- if98 rz qpiond a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current8;3te- z zf9 ihr v4iq+xmpi-o 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 capacitou 5 ww).ie4ygzr of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110u w5.iegy4w) z-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-w ,a9nl6aw 4nbsx3 vn52x4w thW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power4lxt,nbwn6 s5naw4vh2wx 9a3 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 resistor for a phase angmsl e.zmx+;*zfrsq bqau -t 74-;vll8le o7 mal- xf;l qslvs-qtrmz*8;uzb+4e .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.;at v qagf(kzb5 b/g.10 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transfe (g;tvzfk/baq15 g.ba rred 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 outpl /zuh9:hy :yput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is co9: p/huzyy:lh nnected 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 o 9q2:mrfew)y$63^{\circ}$. 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 and a resistance of 30 W. What isp rhhk1;(;1/jqo4di uur, u hk the power fack/1;4hrp hd;1u khuojruq ,(i 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 factor for a series RLC circuit containing a 50-W rbmk0r 5rvto zz+us*:+yx - 1doesistor, a 10-mF capacitor, and a 0.45-H inductor, when connezm+o5 *0drovys 1x krz bu:+t-cted 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 frequen cwp6x1,zhr v6cy of a 1.0-mF capacitor and a 15-mH coil in series?,wv6xch1p z6r

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nee)anufktqu1w , h )u6/lded in series with a 4.7-mF capacitor for a resonant frequency of qhtf/l61au) ,u nu) kw10 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 3.7-mH inductor for a resonant friwyw ;z)f c7yo9s5l5requency of fw)rclw s7zoyi9; y 551000 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 p*.bu+ v0fnk kjd:eem05o4f uhlaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is t veb*f0n+hku.f5 :o mej4d0 kuo be 1000 Hz?

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