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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 mc:-r3y.(x jdwvk lj8 v7.pzovagnetic 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 3r(l*e+y 9n9uhp6qd pxcpzy i :qf.b.$emf$ 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 prof 598oh ia :b2dvhency;4oqz, n+t9j gduces what kind of change on the indu9jbey g4 ;5f2,nd zh vo ah:o8+iqnc9tced $emf$, 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 prodsg5zv c:dpa/3 uces what kind od:z/ pg5s avc3f 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 loop of wire produces what bsobm;4g +* i 5hsmv-0ij1es kmq0e0x kind of change on the indukmeesvhss5i 0iqm ;1gm+*o xb0-0j b4ced $emf$, 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 orpl9vs7 pn 58from a magnetic 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 current in a conductor willj-/u96o7fuu r 09lmr8jlgyqy be that which tends to produce which of the following effecgojju /uy 7f98q9rm-yurl06lts?

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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 plozw-wa+tc-i0tvu cori 2) d0r-d 66held above its center with its north pole pointing down. The stationary magnet induces (when viewed fromudawod-o0c - p6+i26v )rtw0r-iltcz 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 magnet is hel/ku m 58y5nua.eu,cs wd above its center with its north pole pointing down, and rm,ucse.n 8w/u5a5 uy keleased. 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 ;+jlmbnz6pgtn zix: c4g6z+i 26jx)uregion where the magnetic field vector points straight 2n zitcxxn g j6+;u+4zpm)6:ibl z6gjup. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced 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 a region where the magnetic fieldm1(h:e2g (ia:8nhnk3r : qb(cqwh xnn vector points straight up. The magnetic field sudn::n3k(1 nxh:(h2nq 8wqch( mbiae rg denly 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 horizoa4/ldoawa .vx.9k (a8ag mf0 cntal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from abov(ckv8aao9a.fa4wx /.ld g0 mae, 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 lie ckf( )b3j*moqs on a horizontal table and carries an ever-increasing curren)qcokm (bf3*jt northward. Two coils of 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 + k s(tuajr*qx,nwy .+loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from above*nj tq+u.+ks x,awry()

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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 spovcw* oty6 ,(meed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rota o,tm(w y6*ovction if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whosen- ca rk7kni8hc7 1n0n direction can be varied. In a region wn n78rnn0khca1i c7-khere 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 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. b1trro/r5m.a
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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 th:37t or;mfc7 62kybg;p mszvj at 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-c pq de0beo34 field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west dirjb0d6md 9mpo 4ection) is moved northward at constant velocity through a magnetic field that pjdp4 mmo96b0d oints 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 constantj:nv+fhl)e1 1k 2o gpq 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 transfo-bl7sdy gfb31rms

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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 frlb8uhd5 pgllo.z5 u5n*63 tuxmj+ it, equency of thej,nl8 dxbt.5u m + luuz*opg536tih5l $emf$ 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 tor(ed (-bfp.r 5b rt1fx

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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 devicepi:y1a 1laz7x 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 contains more loops than th 9 w(-3hps gtyn-gezn:e primary coil then iygt9-wz 3h (-n:g psnet 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 low43tubt2( t mr q,zs/aops than the secondary coiwta t qrb3 ,t(/42smuzl then 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 input c7 *4-ebo)iao iev.o5oyjoo7ef5 z4d

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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 resonan()7/ma kxk:ks qp0zp bt 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 indu 3 kktwf h11)ka6zyr2djx qxd:5xoc90ctor are connected in series to an ideal battery of constant terminal volta)x kd 35196t:y0wx hz2qrck fao d1xjkge. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inducto er,*tcu ; x3)kawrjg3r are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrosr;*3,r cgje a ku3tw)xs 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 an1 e+)q87ynpbtj ;su zid 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 connectf:awjt+1vfv rxwp ch307) f67 nx9bched 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 battery. ls z3 mpe,l:1d The time constant for the circuit represents the time required for the current to real dspem31l ,z:ch

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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 cwaliwa oml 10) /e(s4jonnected in series to a battery. The battery is suddenly removed from the circuit. Thl)mi(w/ao 04sealj 1we 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 units exc l/qfvc.209,vltt-gedwgl0k ept:

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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, the9ii+a,+m3 h dljb;tf d 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 supply.msu9doo0wb6g. o35j y In this circuit, the current. m3soyub560d j9w goo

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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 what facto5z sr)1x;;)uo / 3ipgarg bith5ho8g cr when the frequency5h c x 5aoiz/) g;h3bis 81rturpgg);o 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 vokmj*wg8vet: gez -2;tltage across an inductor is doubled, the inductive ;vt:j8e-mz e g*g t2wkreactance 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 approaches zero, cmq4x5m7 nrn)the inductive react75 m4xnm)cnrqance 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 this circuit, the -bkjyxu 18n3;cdpf2d currek 32 ;fnjuxpcydbd18-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 circuit chaqs m)ihx47b8u nges by what factor when the frequency is tr 4b h)s7imu8xqipled?

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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 approaches zero, t3 x1c/xc 7gsh/ 97tue6 zrubfhhe capacituxh7 sb 6czh3 7u/exc/9tr 1fgive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inducto dq,*2km a2wxjr and capacitor in a RLC series circuwdmja, qk2 *2xit?

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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 a646x8zwo h zb83mmpxcn RLC 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 the circuit increases if R increase vdyem1k )lb ,cf44fn4.l632pye y hxus. When is this statement t,)ec3 k fm1hul .bp v6ey4ylnyx44fd2rue?

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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. Tdbt; 4v)q3blk(kh/h ghe impedance of the 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 impedancex1pp-: s9esfo1i) gm a 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-,hzh k(ito)t series circuit, the resonant frequency of tha ) (zt,ikhtoh-t circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At re/p6yo2pjw htzwr 1go9.fibrn/(6y j6sonance,

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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 citd mqhbe)hu1 x3w.u2mg 5dmqb -t )26prcuit 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 auc q-+su02sauniform magnetic field of 0.20 T. Find the magnetic flux ts q2c u+u0a-ashrough 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 rotat9cpix 0e5wd e6xpv(1sing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnee v(w5pxpd 9x eci1s60tic 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 ec 0,2wekiwfa sm(; .ylee4 ;aa uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whe(e,mife ;al 2.w4we k0a scy;en the plane of the 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 adjustable singlf7* ynv jniz;u q,a)ef:9ov- ge 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 changesr 0biir/jggo, *7jk; lqko 45pu rdi7, from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with qh; s7x* c ck9s1vodz:tqc.f.q3xxp* 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 indsz dx*c9 kxos7qqv.c .1 c:q t;fph3x*uced $emf$.

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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 tur8 0 bc*8md4; il0e (3pnorq*hrnrqgfans 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 ax( dh(r0ra df/rea $0.20 \; m^{2}$ 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 l70h( o9ruht (( -rryd -nkecgrocation where the u-(t-7g9rc(e yhndr0r kho r(downward 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 at a const)y+m.u1bp ykvg j53bpant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in ambjpu y)vbp1 .g k5+3y 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 ohta. 3x.dz b*ff $0.25 \; m^{2}$. 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 consisz9gxse/;z 4h;rz 5rcnts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on hcoaqe,8 kcq /o/u09o 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 rotatoooek/au9/q ,0 c8hq cion, 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 turnsz0z7g: jxb f7yb zrs1+iqityg:ye ( or 98lk24 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 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 generator wit(dak4krsl(ay 9 2k/o kh an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availar lk2s( /kkao9 4d(ykable. 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 with a maximuh e2kmr1ile:0lr3x *0 1b -yhntk i7cam $emf$ 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 resistanc r8hupi cn:b2ifw85a8e 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. The motor operates on 1c*a8+6 fx7mtdn8kxd 0rt) qs o20 V AC, and when runningkxt67q*ns amctro x 88dd0)f+ 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 reswhrza (.:v7i.w bsmf: istance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cur:w viw a:s rfh.(7bmz.rent?

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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. o3 1 q7fowgnso 5qug:,The operating current is 1.0 A at full fqn1oosg7o :q,u gw35 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 internpn8p v.6-5mejb.toizuf5,tp al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0t5jme8 t-., bup vz65pnpo.f i 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 primas, fbtr28cc cdgwf(,, ry 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 transfwcr,putdu 8 uev103 s*ormer causes 14 A to flow in the secondary. H vuu3edt* u8 s0,rcw1pow 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 necessary in a 110-V primary if the 24-Vkb2o8jb3xnd8/ m stu+ secondary m2 s n38+bxu j/8dtokbhas 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 a174 (vxh/5vg1tzodygri qd.6: asxh e 2000-turn secondary coil. If the current in tdh 4qoa dh/x1egi 51 .gr(ztv7yxs v6:he 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 the primary of/j9fiybghi3 e+(wy, w a transformer. Assuming 100% efficiency, hof3ieibj +yww,g h9 (/yw 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 sign transfo92uzbiegi (q-p 6;3/qpl kedbrmer provides 7500 V at 10.0 mA. The primary coil operates on 13dqp2il9i ;-eq/up g(k6 bzeb20 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 p -99muepd+tvzrimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the sec-9v9 +tmepd uzondary?

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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 o 7-ezoab )fhi3n its secondary coil.oi)fa e-h73zb If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer hasb um77*d,cizflmtn 4 0 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at th n,4m7*t c 7lifzdbm0ue 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 seconbv/( em +2ol5 wgl-u0 4a u*yfkxgcxa+dary has 200 turns. If the input voltage to the primary is 100 V, we can expect the out0eu(awlx+y+ kom f*/ a-c gv4xu2bl5gput voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondar-jfx 8n/neb8 my has 200 turns. If the fe/x- 8n8njmbpower input 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 0 riti)ikrtkti 2 :gxj2 .f*u160 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tota 1tt20rkx*rk2 i) :tiu fgij.il resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A4pb8m, b2bac)mxm vd8pc67m *pyx:mc of current at 120 V. The voltage is usually stepped up to 4500 V by ambx xab,dm p ccv8y 8 cp4b7:m*)6mm2p transformer and transmitted through a power line of total resistance 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 usually stevuw5n/ks:u)(sr6(p:pn m 5xu,s(m, ssjrjp w pped up to 4500 V by a transformer and transmitted through a power linekssw)su/: :(pssr,nv( 6ujmrpn 5 mjx u,5 (wp of 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 transmission line 50 9 9p)llh ci)lokm 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 is stepped up with a transformer with a turns ratio ofl9 c oh)lip9l) 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.sclg98p u5l n2ffc+n;ja*lw g sq87k.60 W. A generator produces 100 V at 70 A. In order to reduce energy l+ j nlf kw fn*lq;7s.cc8g 2s9gu8apl5oss 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 z,ig+w*hr, 9 z-i6 e(z0 vrmslbhn,bapower would be lost if the power were transmitted at 3000 Vezgah0n i-m,zz9hbiwr*s b, +rv6( , l 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 onj3 wow-2zjzpz jhl5) 6 a line with 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 exceejzzz w2h)pj 536lw o-jd 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 awp 5t :gqcy+um/0f-h mjh m16m current of 5.0 A. How much energy is stored in the coil's magnetic field-+ycmqf /5m0 wt6pm1hhugmj :?

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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 resistor and an 18-H i r eja-z.)o7wsx /c+vjnductor. What is this cj/7.sx avc rew-+ozj) 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 m1e z9(ik 6movy)d yk7rms 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 placem j899oy 03 5twmpa/uwjd1yt cd into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the jp ft:cm 6b/iu1jk , uv1bv;.gresistance of the lai jbt vm/vu,1 6;. b:kufj1pgcmp?

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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 connecte(itf3 v/+48ibjlt3v xo j w:tiwa)n ;fd to a 120-V ac power supply. What is the peak current through the rew4n: w+;t i)bto(jvx/8vi3 liftfaj 3 sistor?

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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 of* c-;jp/kub to a 120-V ac power supply. What is the power dissipated in the resistorujbc-; /fk op*?

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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 resijsr( (sxs,pov9c0 za -stor 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 resybs km z0:gqhr235i c0w.gk 4fistor 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 resistorgbawpb- f673 n 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 in n9 5yvffux6qcc fc6 2twm7-5uductor 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 c,i ;vydfyjm -:oil 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 inducts.n*lnik/ 3 hoive 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 indu gp ;1;zqhx +4o c8j.g ;wp;uxdu/mwjzctive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a freque.-c.fzw -5 -ztsw0j tuf+u0tf /ljwtrncy of 20 kHz is applied wtz0fu+.-5t-wjt .f wc zl tu/rs-j0fto 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, 60.0 Hz source sk, g qrjj-okm2/gj*+?

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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 ty 9bcd3) xhbz:xm f1(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 n ,waib;ak 2ii4ve1b,r eeded to 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 10ruh1-l *rd yn04gf-t z-mF capacitor have a reactance 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 reaa,2t9oh- wo fgctance of a 0.010-mF capacitor be 100 W?-oaf 9,ht 2owg

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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 atag,+i g j*x2g rrkdpp3bx0;6q 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 serieo nbd :y+ e6; /,408(s3 iadrhxqmiiutwt1j les circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancyor8h q(40a1d/; 36elijmit b s wiu ,:t+enxde?

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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 impedatk ;k;en h gfsts93h1)nce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor a9 hk3 gfs;n;kht1t) esre connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil,/; c:rmmzpsjmq-4 1 bf and 1.0-mF capacitor are connected in1zp f:jrb4qmm c-;/ ms series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whnjfm2)ed+q rm7 u8) bkat is the impedancem8 +2k)e7njbmrfu q)d 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;k wh38mw u:,jap9yke is connected in series with a 20-mH inductor, what is the php38awm,9 k ejwhk;y :uase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0u utgk1-r -n c:c7ng+u-mF capacitor for a total impedance of 100 W at 1500 Hz?ng7:+uk-c 1tgc nuru -

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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 1:fyj c 84nif3u00-W resistor andj:ic3u4f y 8nf 15-mH 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 be put in serce i vyq0x9z26t.(1aozp.umj ies with a 450-mH inductor at 5000 Hz for a total impedance of 4000010q26oiz9 pevu.mcyt . z xj(a 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 fp0-m d)m;k z-dmill *lor a total impedance of 150 kW?-*d0 lzkl- ilm;mm)p 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 series with a 20-mF capacitor. W*/arec 3:x4i24d gpzw-ahktfhat is the impedance at 100wdtcip-e*a : xakrz4/3 2g f4h0 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 n )tibznn,- a5kHz for a total 5-na bnzn)ti,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-md g ql)7tes4wm 7t-px3F capacitor at 1.0 kHz for a phase ang7wlm)-t74qdx sgtp3 ele 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 nee.x- jn/h *31gfsbnokh ded in series with a 30-W resistor at 1.0 kHz for a total impednk3n * 1b/ohsjxh.f -gance 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 sersnrnv0e p. x:i65n3cpkl* +uuies with a 100-mF capacitor at 120 Hz. What is the phase+ulkspu xinv3p6 .n*0r : n5ce 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 Hz if b;*dq,ynz+6 c/pc om 6rmfxv/a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seripb6q6mcom r/yxd+,;c n /fzv* es?

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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, xw8 ba8 okqt9tm)0jm8 tev7*aand a 0.350-H induc 7xo)a j0tqtmatm8b8kvw8 9*etor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacia;y;od5:t tse7w5 ye ,bzzn* btor of capacitive reactance 30 W, and an inductor of inductive react;zn ot:5,etwz ; ebs7a*yd5 ybance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circu:wjsc*n6rk d0/ a(:evkbpqbuu ;6rf7it containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to arqu d;n(0vja66:sb p kcf/b*:e7r ku w 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 resistor for a phase angle ss fspfbm1d0lhskkz26i,zs 5k :1(r 0of2i,spldsszkzfm 6 5r fs001 k:skh 1(b $40^{\circ}$ 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-muy lkrx( erj,3y*e )y6H, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferr6 yr3uelyy ,e*k(rx )jed from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit wi.i h/kr)i ekq2th 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is cr.iei/kkqh) 2onnected 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 ciq/psz:y 5 lgl1rcuit 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 impedance of 60 W and a f:ovznsb50yr0 23ovnresistance of 30 W. What is the power factfv3y nbn0v5 s2: 0zoroor?

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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-o 8+ql dc82ey7052xnzkfr ecfW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplycyzn0c7qfe +fl re8kx5o 282d ?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil xezmno mr)rqi0l:rww(mu1+lxl d7 ,gn.;(v4 in series?lgzqwx l)7,1(4dn 0m ;rlrwmn +ev :.oumri(x

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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-mFu hw2-ot o z*k6mh7rc1 capacitor for a resonant frequency of 10 kHz?tr *7o1 w k2mu-zochh6

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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 resonk6 ..(fk(+xc-:s mszlsvh 2f o1xdda uant frequency of 1 .klz6xsx-2h:m+ u skd.v acd1ffs(o(000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor* fw ::ftwc4ep and a 40-mH coil if the resonp*: f4:fwet wcant frequency of the circuit is to be 1000 Hz?

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