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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: 游客未登录  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- ;4zt5sxzzb)u 5s*h e aw7gds of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that 5yn2p3h h7jcq(1db 6d 5moioc the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire i hu)pz *bnv/*mn a coil produces what kind of change on the inducedz*u vbhn*m/ )p $emf$, 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 magv1)d x m5i;sx(mgeo3hnetic field through a loop of wire produces what ki 5g ;1vo)mixs3m(d hexnd 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 loop of wire produces what kindbohi2ku x 5 +0:ergf3qxm9bv1 of change on the indu9+2x0 reb:gqmxvu1 k 5bfi3hoced $emf$, 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 magneticz8fdx.r s 2xc7 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, th4q/c3xeg,n;m lcx -ade direction of an induced current in a conductor will be that which teqc4-x g,/3 cax;em dnlnds 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 tablee r7l 9gzo:5aa( hz*vo. A bar magnet is held above its center with itsaz oz*lg 9(:overha 57 north pole pointing down. 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 horizontal table. A bar magnet)krvctamr.r2 qc *g+; is held above its center with its norg.;* )r c+ rqa2trckmvth pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fielhf/evfer harnw4hp( 2*3, /lyd vector points strafe r*(/yrh ,n f lh23h/wavep4ight up. 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 . /t wfi41.g hfcoicy:where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directi1whift:y.o .f4 g /iccon of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnee u 15rprlt8wv5,ho(rcnj:o 6tic field points straight down. The magnetic fi u(v5rt5c1rn8 joo,p6 wel: rheld disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a hor 2x;arlzz2ta /2kan:w izontal table and carries an ever-increasing c2zka 2zrat awlx/n2; :urrent 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 loop of wn5:oo w xbn aif9x3d:8ire with the north pole entering first. As the north pole enters the wire, the induced 9nod85w x ioxb3::fna current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angul t xh qta1v2-pt(p76, uuent8yar speed about an axis whose direction can be varied. In a region where a uniform magnetic field 26t tah1u8xqu-(ptp,ntvey 7points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abwq9bf dn,e, l8n x3pbn/hr,6yout an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation 96,3nhx ynlf,rne, / d bwq8bpof 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.ja28ajv fojkfol 72*s //wv j0
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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 t:sao 4yl x hg55zu n*o3;v2mfyhat 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 mag zbahcrk/ r10da,9q4 hnetic 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 e6ot: v0nxf tlfsy8b*n) u4s9east-west direction) is moved northward at constant velocity through a magnetic fie )tyosfxe8fsn0 :untv6l b9 *4ld 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 anq 3ybbcz;+ rnag 9*hu 9 1p5523xl6 waoaoisvngular 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 generatofaiwfncuq1 + (d;d ;y+r 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 revolution),(+ bjwd5z/ q4c2zh k,uoxknli o)t us each second. The frequency of th4)kw,,5 octzn djqoh )xz kbiu /(u+2le $emf$ 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 dev ta.0mjfmh+ :r7 c*k y-zze4xbice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thz4qqhe4mj*y0ujf k +: igz1)hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the d*c 3a+ g92h wgzuacc,secondary coil contains more loops than the primary coil thencaaw*c+ 9 c2uhgz3g,d 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 primarq f4 akbd8l;(ep46rrob0ys vh( g c,z+y coil contains more loops than the secondary coil then it is aarzs4bkgvh o46lp( ;ybq,(8 0f+rde c

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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 irrvo xt 0i+fxw rwc;1 ,w0(,isnput

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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 resona7s hes6p)o*5.ry q0ij 1keni snt 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 aly 7xu;oe8 (sfn ideal battery of constant terminal voltage. At the moment contact is madys(f ulex;7o8 e with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cons+zdy0iwa4; rdg,) (i8qrz hxvtant terminqv(r hgad z ri4+ dy;,w8xz0)ial voltage. At the moment 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 resistance *mi0hqb(1 co-ef7jfvR 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 isn9uqn 3tx n03 um3 d,um4ml.ap 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 battery. Txh*-bjam/p+4b i /i whkl7f;q6o l0yghe time constant for the cfip /wxhim/ a+g jl -;qb0oy*h4l 7kb6ircuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The bcb3 ons.okpah*45 h :qattery is suddenly removed from the cir*h .poakn4sh3:qc bo5cuit. 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 units except/ gc 2jy, bx.jeza*h7c5suigs*m56 lr:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curtasitpl*i52(j7n 9 tq mbo)+t rent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this cixwk7dxv9jb , +rcuit, the currendxvx7,jk 9+ wbt

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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 w pwayor0r 7i4p:-j t+changes by what factor when the frequencirjoa7w0 -ytppr :w +4y 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 vo tk7hj m7cp(f1j9*ht8+t eah yjo /n)o 83fwekltage across an inductor is doubled, the inductive reactance of that inductor8/9chpt*fnt3 w ( 81k + kjojeajt7o7h)f hyme

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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, thej phlou+s(cz j w/ im7 0/v)do3e +nht)su+c6i inductive reeoho6( jnztdp0s+ws73)l/iu) /+ j cu+ ci vmhactance 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 c5yiup:2 y52gd3 egrk ourrent y 53e5k doggry:2i2pu

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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 6nbl 5gh wrav84ba)e7the frequen na8 ebvh)agwrl7 b465cy is tripled?

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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 approachspf krb4jfkqz11 n 4n3*wm,t5es zero, the capacitive reactance of thfw1np3 5 r zms b,44fk1n*qtjkat 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 capacitovha)dl szfxdm80o( 4:r in a RLC series ms)ld (h 48z:vfx0o dacircuit?

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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 RLCq5.nll.oppu xa 3//pe 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 i* 4j,hwy a rztn glj562st-5axncreases. When isj 5n5ta,a*-ytwjh 6rx z24sgl this 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 the circuit inc 0sc*nnem (pzgscwz9r.j+m sl:k;y :ygs+ :t*reases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of jtr46.h5q altthe 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 theyi i5* sd9p9cnyi 3pc3 capacitance both double in an LRC series circuit, the resonant frequency of i395pp dyysicni* c39 that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltagpckg,) jpw;0dl6:c +x oy+ckse. 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 RL fptu9rqpv* 7.C 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 0.1mwb0/b7rg. 8n,kpn hn0 m is rotating in a uniform magnetic field of 0.20 T. Find thwb7 pnmn0gkrn8 /.,hbe magnetic flux through 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 i pi5wbx w oibo/6s /y)fd.n/rh838swu n a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of/ y udbfor3.xnsbw/ h w8sw 6op58i/)i 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 uni27 gs lqrktwe(vv)ly 2t:*xaj45 eyt4form magnetic field of 0.20 T. Find the magnetic f ew:xlv5 *q2lg styk(24jry7e4 av t)tlux through the loop when 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 wu2gxw c 5rp+3single 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 coiiaiox 8d:, )h+7k kict rx86ugl changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sideut21f8l blr r7qix6w 0s 18 cm. A uniform magnetic field is applied perpendiculb6xrr 8 1iu0wlf7qt2l ar 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 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 witdwm; bm8 jlusrr73 mbq4,j44 rh 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ide8wfk5 x .2fg0atcmnf7- 9oarea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location wheq.+ny 3dixt g5re the downward component of the Earth's magnetic x+q.d35i tg ynfield 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 constant angular hx(8:leh k1.wlvg 1y vvelocity of 2.0 rad/s about a vexy.8l(wh kvgh: 1vl1ertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loopsq c-/b kj*cc-d 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 o ,haorn0 nfc *g;hk9gh s+dw-0f 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm lbu)cc0nn f:6gong :g 6fn0ccnb)u 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 output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of iuwydsj.0 rh2 r9nuudg) 6lm9yw) v(; 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 t4;u gl f3dt96q3sdte 0a-gdb 89ftkyeo construct a simple AC generator with an output of 12 V maximum when 3 f4-g9t6u det0tglsq9akb;38dey d f rotated at 60 Hz. A magnetic field of 0.050 T is 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 with a maximk7qi8zvo b;ggnk lqs717:: y1 ce .rjqum $emf$ 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 resistancefv /1)wqed b:z6zqkn 7 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 h flm1-b wy4 ,bhq,ugjij2b* 7zave a resistance of 6.00 W. The motor operates on 120 V AC, and when runw7muh bbf4y 1- lbq2i*z,, jjgning 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 zbzom4 9b0w;n qg3j cg1s 5a88p*izngto a 24-V power supply. The operating current is 1.0 A. What iaqzn5gz8p1*c0g gs8im3bw4o ;n zbj 9s the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is v/nemyv yv 8c(;ikajs5 l 6n-5connected to a 24-V power supply. The operating current is 85y jyv6s vamn/c;nik5 e(-lv 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 0p q zk92/1ysyye.21zaobsoa 24-V power supply. The operating current is 1.0 A at full speed. What is thye0z 19bsoyzy kp/.1aoa22q se 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 primary z3 gjy.t8zse4voltage 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 txmm*y4u*0m r w3/hddpo flow in the secondary. How many turns are /pumx 4*rmm0 h3dw* ydin 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-V ,aorl6zt3 0ngxo2 ;enseconda nx ,n6ot0o glzr23;aery has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coanmjbs/ m(8o ,v3+ )yjdbb 9od5m9ipyil and a 2000-turn secondary coil. Ifsi 5 bv 3j9ma 9j,ydpom(8)dyo+b/mb n the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in tq,jbb (lfqh c:s lck.k,zxi81 u*n9.m he primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seb ,*:fm .j.lk8zncq9k b (l,1xs ichuqcondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provide) jmmfj1,4lmes 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the prima 4fmje)1,m jmlry 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 ask:os 7n*pw5snd 300 turns on its secondary coil. If 120 V at 2.0 A is applssn*op:k5 ws 7ied 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/ cr9.po81u: w gfwbig its secondary coil. If 120 V at 2.0 A is applied to the primr.gw/ wocgipfb8:91 u ary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hyit-sh) e/us( as 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to bsi( h-s)uy /ete

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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 zhn;6k or/ux1/2rou k200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secouxr /k o/h2;nk1uro z6ndary 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 hascz0oyoky, l9g yzsd+e97 ch-0 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the poysly7hy 0,co+kg9e9 z d-co0 zwer output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually sgio 9 tlluj6l: v.q33qmjp3j,tepped up to 4500 V by q tqgi o. ,pl:9 u3jjl63jvm3la transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 Abr*.,n4o1a nuskrz2gnt, p-p of current at 120 V. The voltage is usually stepped up to 4500 V by a transformsu,ok.p n4a*r2 r-n gpn1bzt,er 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 4)* toiz/oq fkcurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission lineq* toz)4of/ik if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W7hfm11dx d4lw(zour ie45h6 q. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original ee15(fuqoz7md1dx4 6h h i4r wlnergy 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 resisnb7alx /j,tptl- p9( htance 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 upnthaxbl p9( ,/p-7tjl 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 dow : cepp v+0g;ra6u5bjun a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instprgbu j +e acp50:6u;vead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a linwmg 6ow 0jx fk/ 2opkx9iq:9zs6/xus-e with resistance of 0.60 W. To what zgo/-os6qkx90k 6 xwu s jx:i2fw9/mpvoltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is store4.cz vjkj0qm8v 8ni0od in the coil's ma vk0qcjv. 0im8 j8ozn4gnetic 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 resistor and aggt:o p d7i81cn 18-H inductor. What is this circuit's time constap 78d:ot1cg ignt?

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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 v2ch-jcwjg4wit+bs;q 7 dwc: 1oltage 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 o2zqv0r8;c lct /b2kt tutlet. 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 7mmvb e4ta; 50ph)i6rub a+gathe resistance of the lam tb6vh5gam)m ;pe47i+b a 0arup?

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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-t,sme.lbs6h*6r jvh) bojq7/ V ac power supply. What is the peak currenvs*6h/o ljjqs mr be,b 6t.h7)t through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V an/u 1tr7 ) y /oownmk4;0esnxkc power supply. What is the power dissipated in the uo;nntsw7/o0kk x e 4rn/)1myresistor?

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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:m j(0p uvs.hil60xnz-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 re6a zmu*d)sps yc(gv5,sistor 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 501f grl8s3 xko:-W resistor 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 iau /c d9r99cop(.pe rh)t9kcbnductor 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 dwda:/u lvr2(*r io( sof a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0v,vn i3hvug 3h(89;x(enc nqi W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reacta ce* t*-zrimu)nce 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 inductorc 5d*j(nogp w: when 120 V AC at a frequency of 20 kHz is ac:o5 g*w(pj ndpplied 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 yis la/c26.oz- 2dilsdue 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 cap gex*eh3 p,3j 6ddua-zacitor 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 to have 50 W of capacitive react*g*e 6vq ;wxwlnsw1me3n+ 7co e-rkp,ance 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 rea-d8ej 0k 3r tpw;o2q+4v scjhnctance 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 reactan4- 6pahj;7i2 aybhz/u/adc3 b4uya yfce of a 0.010-mF capacitor be 100 W?3cyj 6y7ybh d ua;4a /ai/up4z-afbh2

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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-ah4 b is(y+vrvuwjo(;, cj fm1-af1r/mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W indb h jet;z0ja z.u,83zeo-tk6bue6 j,e0o-b.kzu8;bh tazjz3tctive reactance, 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 1i9zl12uxy2,pz4 mfdv:(yma9bkz dk4 .0-mF capacitor are connected in serie 1:z kkf49bzlm, dxp2(i amv942yuy dzs?

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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 +7ysd0vyrq 2 id/p 8exuows94 resistor, 20-mH coil, and 1.0-mF capacitor are connect9xv4uqys8we+d p20ry7is d /oed in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected inju y mw5b/v48a(y29ikhz0 gh q series with a 20-mH inductor, what is the impedance at 1000 vb5 9y8y4m/uhj zawh 2gi0(kq 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 copl:v58 xpye.kfzg +7+ sqvwqq/h /nn1nnected in series with a 20-mH inductor, what is the phgnh5p.sv 7w8nzfvk +q+q qy//p: 1elxase 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 needej , ;if(e9-zqeg 5les uqf;u*yd in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total y u*fg (eqsef i-qjl;u9,;e5zimpedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series ,4l uhy (o mxmcqws5+:with a 100-W resistor and 15-mH coil to get a total impedance ofyw 5m4l+hsucoqx m(:, 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 2xkx*m)41bwa q4yaos(ffd n6 put in series with a 450-mH inductor at 5000 Hz for a totalxyqxaok *d42m6 ab(4)1fsfwn impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in ser um82ysy:rwtidhq:1 n8gg(1 k)tjne4 ies with a 100-kW resistor at 1.0-MHz for a total impedanc8(kj gigy:qw)td14hn2 mnsry8 e t:u1e 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 capacitorj36d,mv(7i scc(0 pybht x7 hke sp+, ,qsq)ka. What is the impedancev , sdt(i k)q7jpbs (pmh3h76yksq0ca+c ,xe , 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 fo6sdvy +xm9xd -r a total im+v-69x mdydsxpedance 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 ) o;gy .5u.,4ar1vh r lxseozz10-mF capacitor at 1.0 kHz for a phase angle g. luz4oeah,. rx;v )roys1 z5of $40^{\circ}$?

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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 30-W resi8lc wfj vs.:mba9 :xgxfc (q1)stor at 1.0 kHz for a total imf 18mvw(9gsj:.c:b ) a qflxcxpedance 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 witkaj e1 4fld1/b):a up1d iktq;h a 100-mF capacitor at 120 Hz. What is the pha :4tfdk1i )1eka 1 uja/lpqd;bse 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 a wg5jpcf0y;-2mga7n r4d j*rp 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sejwjd*r;40 -ggc5a7 2r pp ynmfries?

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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, h8f2efx tnl*iu9 t o4.brv86g,r tnf,and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuittionhgrnulx8 ft4,,r9 tf 6e 8bf2*.v ?

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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 capacitive reactance 30 W, and dey5 i 4nnl7p1an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz p75e ndin4y1l 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 anglet q0a :c af)nf9o.r4ze for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-Htnf a q49)afoe0 .c:rz inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor fs *xq5w36r7e0oy m m3gazg4 gbl/mti7or a phase angle of337gmgltq y *g/e5740 6xizabm owmrs $40^{\circ}$ 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 freqk8,:cdft/ 22bir ocph uency should the circuit be driven in order to have maximum power transferred from the 2r cbh/8tic2d,:of pk 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 iq9f4f ;qibh4s tba62z n an ac series circuit with 12.0 W resistance, 15.0 W i4zb6qi f q4f9th2sab;nductive reactance, and 10.0 W capacitive 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 an pzp: y +:l8xqku6t7z jAC 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 ea 9aa7 p qp9;*t4qsltimpedance of 60 W and a resistance of 30 W. What is tapt4p; s97 a9qtqale *he power factor?

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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 :;e gds3vej9q qa tr*: f.qbk0for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supp* :e3;eq: k0bg vsrt.fd9ja qqly?

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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 cq1 - 4 yuch3/oj0idwk7cm ;io rguv( /(ujjzj3apacitor and a 15-mH coil in series?j4r3 / c mv 7kqj (i/ju;-y10(dwgzouihuoj3c

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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 4.0 gc aw4kqg0nik4pm4;7-mF capacitor for a resonant frequ0ckqg;g i0a 4pwkn4m4ency of 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 5cqnxl 8ko :1dt5qwnb(x,f4u series with a 3.7-mH inductor for a resonant frequency o( t:5,ub xqf5on1 8lnxqwcd k4f 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 must be placed b 00v ned(,irn isf9/-w4tvlj in series with a 30-W resistor and a 40-mH cov9f0erlb4-wi ( i,vnnt d/sj 0il if the resonant frequency of the circuit is to be 1000 Hz?

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