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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 fel y 9ns+zhtk18r9m x:(7 lquxlux 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:zb,m ksf ,-ct 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 looli.4k, d8:ublj- zb vups of wire in a coil produces what kind of change on the induceuid.ku,b 48vbl l :zj-d $emf$, 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 fbygsm,:0 ; fojield through a loop of wire produces what kind of change on thg0ymfj,s; ob: e 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 ei :xrb+;eeqf6p) s0 jchange on the induep: +;sri 6bxq)ejfe0ced $emf$, 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 magneticqo:78 a5gmoe hnu.8kv 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, theal /z/z+ z1l38f yallse*g2cz direction of an induced current in a conductor will be th/ 8la/ac*z z3l2sygz l+1fe zlat 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 i 3f+uuo ufspaa:k81 e.s held above its center with its north pole pointing down. euo8 a .:pu+u1kfafs3The 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 horizontal table. A bar m2-eav(+jdw 2)j r ;c g1pzhlbxn z(n-vagnet is held above its center with its north pole pointing down, and released+ z2-j;x-j hnd r vc1(nav lwzg2e)bp(. 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 magnetirya:7 25algqxc field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current72:qa ly5agx r 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 a region where the magnetic field vecton qz lp0ks3c8f n/e37hr points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of th/ hlnc e873qspk0z nf3e 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 magnej*tbsf4pq fd()ve 7h4 tic field points straight down. The magnetic field disappears suddenly. When viewed from) qfpfb*he4s4t7 ( vjd 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 howv;hrhz 0)+ rl56aad zrizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. hd6rh5 vraz )wla; z0+ 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 wthvuvf 2,( .ufith the north pole entering first. As the north pole enters the wire t vhu(.2,fvfu, 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 izejzr-l: nfyu 635r+us rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fz5 u6urey+fl nr:- jz3ield 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 atg,0y3 mau- zgs8g pl-:s/hsz e constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points strzhlusg ams/,08:ey3zpg-- g saight 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.zrgk ,f-nx45y yqqae f7,r9 t6
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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 ni id ae:-wznj(/r7x- $emf$ 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 ek60 ngpytyh76pe hk+z-v8b kr*i b/ 9a;qz7lmagnetic 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 eastt3sfun6;/wc g1jl-v s-west direction) is moved northward at constant velocgs1;l/cu6j3 n ftws-vity through a magnetic field 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 an,5.cha5)/nihr3q l g zyic+zcgular 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 generato9bsz(7c jj (lgr 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 revolu nlbhl:5n:9 pmtions each second. The frequency of thl5mn ::blph9ne $emf$ 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 used h1/ ommy2nm ni-,aaq8to

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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 devicesm ;8ti xmp0x,zu5p1e 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 th ie9tsy)z6c, ie secondary coil contains more loops than the primary coil tysizet), c96i 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 contains more loops than the secondary cogv+zw3, tty. 57yt: fl jvf*qp0fd-ye il then it is az tfl:vfg0yp.+t*3j7fy 5dqv-y, wt e

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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 inpute :48yjmpd,02bea 9z 8q ei(xgtgjf3 h

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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 resonant7/ k28pjf/txd bqwt) g(,nyxx circuit,

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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 battery of5qdw, l3hjs) 5 whp/9,pmomwwnh9bu. constant terminal voltage. At the moment contact is made with the battery, the voltage across the h,owlsmpbwj q5u .p539n, 9h)wd m/whresistor 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 battt45l2vf7 q lei whyu21ery of constant terminal voltage. At the mo ltwu2lq7ivy 21 h54efment contact 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 rj+ (a2oeza9vzfuxp.6 esistance 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 connec5c)3lt ida: x -5ghzoyted 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 battm os7kl1fe8cs1* rdb4ery. The time constant fors1mkbf d4 cr*slo1 e78 the circuit 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 coalr :4p0g1ic*r12 f ybz-d b0iqey; dcnnected in series to a battery. The battery is suddenly removed :pyal z2qr1ycbge 14db-f i;r0di 0*c 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 have the same unit ;xm/+v:t dbgl6 /9az x3nu q3wmzo3ras 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 circui zny c-6n:9thu x*zdm3t, 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 supp3q+ff.4 .it k jbcb8rily. In this circuit, the current.c48fikjrf+b. qb 3it

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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 changes by wha-gd ge+. v3xhgt factor when the frequency is.hd v-g3+gxeg 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 v6 *i/4nct:u2,q0tslbf rq x xvoltage across an inductor is doubled, the inductive reactance of than:u*,6t/i xtv cbq 4rq2f0s xlt 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 approac9pf5q5 p6 5b1rzufag8v7m if rhes zero, the inductivev8rpqzra61u 9 55ig bfm pff57 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 con,5(oy2bi s-k;8j tesop 6aftw nected to an AC power supply. In this circuit, the curre65(fj8 wto;y2ak,ibse op- ts nt

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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 cim5v acd/k4i9or zc*0rrcuit changes by what factor when the frequency is trip5c/mr i *crod4vzak9 0led?

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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 th4ona6zy go91 ie AC voltage across a capacitor approaches zero, the capacitive reactance of thanioay 49 o1g6zt 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 voltages of the inductor and capacitor it g 1n mmv2v i6yityt*-,aix 1*o;dam:n a RLC series cxm y1mdvv**amni, tt g62oi -ity ;:a1ircuit?

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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 RL c8e5 w.flw00 j3vqgwtC 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. The impedance of thxhc)fmib.glv6 -m0.z e circuit increases if R increases. When is this statement t.v .m)mgc0 hfx6-l zbirue?

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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 thegkzao) xuwk8ip5/6 8k 4clh6i 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 impedance3fp6/u u-xv gg7nu1xn6o 0 vvx 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 circuey-d5t7 96m v7l v6 udvd2lcxjit, the resonant freq76dxe uvmjd2-57c9 v6l dltyv uency 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 thatsiu wfwje3 (9pg8mv8 -, up *omnwe(e1 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 R:mc5ms.gw n nf,u 49jcLC 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 is27kth,mhzo**aue8f.a6v nz r 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 field vector are para8nzv za6 t* aohm*,k.hf er7u2llel.

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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 oh(1lccvbnj: m77l5jrrpd7 g3 uj9h4e f 0.20 T. Find h vg(7 pd7jrrhm c b:u 54ljne7jc9l31the 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 rotatl8d jneo0d ijx.y5o-fay2b: ( ing 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 field 0n2f (iex5y j. y:jdad8o -olbvector 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 adjustabyz+rfp;v 1ul0le 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 coil changes fromf(emb(rvs5)4)jb 9u y 5rm rnk $4.0 \times 10^{-5} \; Wb$ 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 wyk/0:r;6w qxmma (irknp 7b. mith sides 18 cm. A uniform magnetic field is applied perpendicular to the 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 inx0 ib;may r:/.nwk7rpkm q (6mduced $emf$.

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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 area0r: fxos0qz+k 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 2; j.-;sxiru;eu-rdh vdoz7 hand 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 66zu0 cb t-7oql0 m flies horizontally at a location where the downward component of the Earth's magnetic field oc-z0b 7utl6qis $6.0 \times 10^{-5} \; T$. 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 at a constant angular ve ,ye* dwxa8j7glocity of 2.0 rad/s about a vertical axis tx, wa*87jdye ghrough 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 cross-sectional area of 9*7)n t5 : e/fpzawlayaxv91wca(hu n$0.25 \; m^{2}$. 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 100 turns r zg8hty,-:n twp3z p+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 n8vr;mpn*+v /wk-d/mr ,gc uu qc c82xrectangular loops on its armature. Each loop 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 maximum o/ u/x28gnr+cwm,-k*;rv dn8p u cqvmc utput 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 o,l.egfht4 +4 wvf .dbif 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 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 simpl5x kk,o2wkd23 f r+hane AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is+3rkdfn,2xhw 5 oak k2 available. If the area of the 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 wifab(y1b qrw1) ,pj7k lth 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 rf wbpu*z( bw:1esistance 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 6.00 W. Th0rk q( 4xjzc +a,xz:c 7maaj2te motor operates on 120 V AC, and when running tq2c,:4x+ zx7azaj (ckrj ma0 at full speed 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 connected to a 24-V 8*0bqlwpxwr ekb6 14spower supply. The operating current is 1.0 A. What is the start-up currenb4l1ekp0w* 6bq wxs8rt?

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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. *db6 l pq1+tj1yp,7axa0tg *, tehc-btyxmo *The operating current is 1.0 A at*px0xbpm*a6c,t o7ttyg+ ql1b j*ae,1 t -hdy 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 5o f qrv.fw52wjj c *;:lkb4en6.0 W is connected to a 24-V power supply. The operating current is 1.cbr5lkjfwjv5* :.en2oq 4; fw0 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 q;b )wtyxx7z5i 0gj8nneeded 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 causebk.izr85l1qho nprkb h x0gc,4 h(.m4s 14 A to flow in the secondary. How many turns are in the secom5 l4q1zrgbnh.kh( h 8ibxrc.,k0 o 4pndary?

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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 arebh,;6 qmfj8 jt necessary in a 110-V primary if the 24-V secondary has 100 t,; f6jbthq8jmurns?

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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 3s80b.wdmzpya p4)rc coil. If the current in the secondary is 3.0 A, what is the currepsyad80). z3r4cpmb w nt 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 of a transformer. Assuming 100% e9qy a3r(fsnbbww1 0; qfficiency, how many amps at 24 fq0rqwy; sw 9 nb(a3b1V 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 neo0lrx l .r l.frh5ly46bn sign transformer provides 7500 V at 10.0 mA. The primary coh yf.l0 lrrbr4.llx5 6il operates on 120 V. 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 60 turns on its primary coil and 300v 1k df9:0hmnm turns on its secondarymf:mn1kd 0 hv9 coil. If 120 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 has 60 turns on its primary coil and 300 turns on*tvb vz mn,c.qg+.cf0 its secondary coil. If 120 V at 2.0 A is applied to the primary, wha.zmf *0v c+nb c,gvtq.t 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 100 turns e1s5g-orf xyccj -e;0yg5z8 t,qgc b+ and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curr- rst5e,+yjcg yeqzox1g;0 8cbc g-5fent 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 turns. I1z h6sp,+)xzh(bn )u myhi;j:oz ig1q f the input voltage to z1s( hzq)y+iu;,h: bix6zg)no m1hpjthe 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 havu0z:2vpdgrn ,i i2 +fs 100 turns and its secondary has 200 turns. If the power input to the primary is zn:rdip+v,vg0i 2uf2 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 currento72w8gcxpj*v47f f 9 gkoc:rh 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 number of turns 2fwj8xfg79rocov7 p*:kc 4hg 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 currenpu9oh:k8 jh3ocb zu*2t at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance h:o3p2c9* kbuzo ju8 h1.0 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 usualy ruc*wi8avup- ,( ei jvn3,y1ly 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 v-3ev1yau, wp j ri8 cn,i*uy(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 al a j5a1cth+o2 .s u(iut6l:vb +b)kkm 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 vomsj a btliho:c ta 5()++.6lu kkbv1u2ltage 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 resistance of 0.60 W. A y +j d/ves9.x4d;gbcxgenerator 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 is lost when the transformer is used/ cdsxvjyb;ed 4xg9+.?

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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 70n nsed ucy ox3;3a+kV. How much less power would be lost if the power were trane;nk c+ xduso3 037yansmitted at 3000 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 Vntp;1 hx io5d;7q +gpb 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 trqibo ;p;dh7 tpxg1+5nansformer 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. Howw r6kl 75lj-z z0mz86nd.xet w much energy is stored in the coil' r l6zent.l z-w7680md xzjw5ks 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 contains a 6.0-W resist7 pj6zdpn u8)gor and an 18-H inductor. What is this cup8jd6 7)gpnz ircuit'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 the rms volta (laukf)m .o6ige 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 ACng,0 ,cmd9si u4s 82vhk0uewb 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 b2l0)whn:vih into a 120-V AC outlet. What is the resistance of the lah:v h2)0wbn limp?

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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 rbys07h )c*4n5/ qza8sc xvuh power supply. What is the peak current through the resiz/cq y)r7c5 bsuh0h8*xvan4sstor?

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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 powek2;kha)yqi , ar supply. What is the power dissipated in the res2 )ak,iqh ;kayistor?

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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 eyk ),mk ulbb o3+y)qrip2:-z 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 respx )h8.ha)vrd8l boj58a ri34gp+gpk62xzve istor 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 resistor:biep :st1 b(d 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:htrrv 8t 4z*x 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 2k-ea -:p6x .7 p9nrn* wfs 0znpjo;jnm.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 of inductiv3 c/g ;z;izr*j74pzdhee+opc1 bkd6fe 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 15 30zoa-5zf jrm7 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 6 (yfay :-iedi60-mH inductor when 120 V AC at a frequency of 20 kHz is 6yi ey(:-faidapplied 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 2.58wb*q)yvkh8 l 7gx e4z0-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 kHzlmrlo509n z1 voq-r0u?

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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 reacta ;0p vkr4:vj o,btms4mnce 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 120vge * ,8xz2* u:n4 gebdzlsk0d0 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 capj6rhw3fq 7u6/j k/qw;itty9b acitor be 100 W?6wt q/bf/i7r h36 u tw;j9qykj

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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 ci g,iv.2jk gk:apacitor 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 of an ac series circuit with 12.0 W resistance, t9lsfz2qe 4*a15.0 W inductive reactance, and 10.0 W capacitel4a s *f29zqtive 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 atq agipn09f3w /2pbz9dft: -u 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected zpwgntf0 af-qt:/u9i 39p2 db 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 resistor, 20-mH coil, an o: v.cfw.5rxgll ssn1ma 46;td 1.0-mF capacitor are connect m.4ts5rl o;vl c an6gx1:w.fsed 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 connec:ec1a:3f v.pky-:o1qp:5m uhbcmglr ted in series with a 20-mH inductor, what is the impedance at 1000 yhoa::k gbrueq.1: mcpv cm35pf1l- :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 y7)cym (ir36d eg*ejzin series with a 20-mH inductor, what is the phase angle at ey cy 37mde*zrgj6(i) 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 needek9hqvwea1j *i-j*7 a 0qke ub.d in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedancj h-eek q9.vqbajw7ak1i*u*0e 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 capacc xu5+s8t y8okitances is needed in series with a 100-W resistor and 15-mH coil to get a total t8osyx8ck +5u 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 be put in series with a 450-mH inductor at 5000 Hz for vzx*bgwn2)9v5id :n q5buh; xa total impedance of g 2dhb)b5n x w9q*:vu; zxn5vi40000 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 fom7y:1);uk4uw ug1 b8 kufwo9f knto/xr a total impe84uwk 1g9/kfyf)uw bu; :kon1uom 7txdance 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-mFsl,jg6u dq- q8 capacitor. What is the imped,s l 6-jqu8dqgance 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 sesq lf9. q mzcw91x(wl-ries with a 10-mF capacitor at 1.0 kHz for a total imq ls9xlcmw.(f- q9 w1zpedance 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 se ds;meynz, *s:ries with a 10-mF capacitor at 1.0 kHz for a phase angle ofde:sms,; y*z n $40^{\circ}$?

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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 series with a 3-qr nuy6 ;r3c/, hsl xyrz:,/pktrgb;0-W resistor at 1.0 kHz for a total impeda y;ns3hg-:uc qr k zy;,xt b/6l/rrrp,nce 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 wno7b6sd t7 dy:s5f+ ozith a 100-mF capacitor at 120 Hz. What is the phas6oztdb5soys df7+ : 7ne 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 r ;es*ymzvh81nxv g,7 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in rz vex7*m1syg8n v;, hseries?

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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, -09m6jyxdvd yand a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whav6y-0mx djdy 9t 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 c7i+zt t ytx hcz:..bw.apacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in thiw:yz. h i 7.cbxttt.+zs 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 ama btr)h5fe67b 60tyv series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-rb ft70vey 65hb )m6atHz 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 necek56aeq wv21* r3)zptn4( u ay;syyalcssary in series with a 500-W resistor for a phase angle of yayr24v as5uq n1y)z k;*(lpcaew36 t$40^{\circ}$ 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 = 10.0 mF. At what frepr zn: ;givrp33v/zt) quency should the circuit be driven in order to have maximum power transferred fromtvpvzi/ pz: rrg;3n 3) 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 an ac series circuit with 12.0 W resistancfeb7xgh3 qc2iyv n15 8e, 15.0 W inductive reactance, and 10.0 W c3qh5v8 e2bf1yn i cg7xapacitive reactance, 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 a 6r5f81xau2egds (zpph n; sv3n AC circuit is $63^{\circ}$. 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 impe f//swh7qvu;s u.0 zuvfa+ p4vdance of 60 W and a resistance of 30 W. What is the power factor.s 7uv as+hp vvu0/qf4uwf;z/?

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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 x6 rxa ..3gfcffor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a. fgcxx3 f6a.r 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 capacitor and a 15-mH coo;csz5aasgab;6iyd ;h.n 9wehi7 c77il in series?zi; so6swy;dahgab;a9c7i5.h en77 c

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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 resonant freq5s) *tkx+8n p a(te8t+bdswpwuency ofkdb(t +x*5 8 +wapssn) ptetw8 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 wii, ulo4qh,o re ia634mth a 3.7-mH inductor for a resonant frequ3 4h,q, reuli 46aioomency of 1000 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 j7l.5jpw( hs ;9 lzziemust be placed in series with a 30-W resistor and a 40-mH coil if the i5h7zz j;esl(w lp.j9 resonant frequency of the circuit is to be 1000 Hz?

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