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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 (6s,)ypm up3l- sw/owvbem5n 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 state -(lj tgsfjh9 pt+ss/d1f*q.fs that 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 2 np.qak4dzsq, us.+ lin a coil produces what kind of change on tz4 u,lk+d s nqpsaq.2.he induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through ,sn q4g cfnfv8p19* nza loop of wire produces what kindqgnnz9sc,4f8v f 1p*n 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 kind of cha,eng+ y 5kd 6lo u bc;x5frtv(2i-px1pnge on the inducedob -n5p61lgy(uic r d xp+f2ev;t5,x k $emf$, 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 fro c2mr)nl:q *;.b hylqxm 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 inducedzj-)ajx4 ;ju .5v(ntvecv0yo2cm 1 lp current in a conductor will be that which tends to produce which of the followuavncvj4) cv;l0tey.m1(jj 5 z2x po-ing 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 horig-a6,rm,wdxy k5y0w dzontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abovery ddw6-,kmag x wy0,5)

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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 0i noar,/v .eja1bp nmpp1v/c4m*9pgmagnet is held above its center with its north pole pointing down, andomc1pp /pi agnr*,ab 0v /evj. 1n49pm 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 field oe+, q*9gd:jp;bve jyvector points straight up. The magnetic field vanishes suddenly. When viewed from a* 9yjq:+ve,dog jpb ;ebove, 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 field vectod)31usoax(sw;rg 3l h r points straight up. The magneti;gd(3x hs1rw)slo3 uac field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontl+lmxq /p;:p8og ka:kb;0 knga3utf5 al table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappeapfxk oq;mn +u/5: 3g0kp:albkt 8lg;ars?

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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 vzr s,is2rqqwx mrm/.h, s )p3o/tm81 a horizontal table and carries an ever-increasing current,vp)m3r8tr/s1zsmrx.w,oqhm i/ sq 2 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 wire with the north p/h l;rd63;wul r/eniu *3epmdole entering first. As the north pole enters the wire, the induced current will be (as vih nl;emeluu*p3/d; 3wrird/ 6ewed 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 rotatehn4qz4m8 s kl/ki3 5rrd at constant angular speed 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 rotr35m 4 ksqlih4n/r8kzation 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 spcm-,c0 ob- 0 ttoz/ffbeed about an axis whose direction can be varied. In a rmft ccz,f--boob/0 t 0egion where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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.,0wkp.rbd54sb-zqnat o ;l,u
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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 otqw- pip93 ym-p. dv6an $emf$ 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 magnet 74adcknl9(iy e0 2ycpic 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 (orien 931oq1,q c bzdluxg e8i,)bchted in the east-west direction) is moved northward at constant velocity through a magnetic field that pointi1q)lu 98,1hec3xbz ogcq d,b s 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 agf pr/tgt;c9h:p * wmmgsc-*4yg3 0laoi i-d3ngular 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 transfortns(8r45* y baj q2cc4ng 9effms

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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. The3sm( *0g5 pq:ejhqswa34 fq oa frequency of t0f qj(*pmq:s5w4 a3geaqohs 3he $emf$ 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 deviceyuh.vku 69u )7qc jgk3 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 s4. jc-a/ jdknet7b/zh bz:+athat

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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 morek i ;5(qm91iaat1py os loops than the primary coiasy(t9ia1 5mqo 1kp;il then 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)h7 x 2vp8+h-ndbfne /s49k lr f(edsb)k3d wm primary coil contains more loops than the secondary coil then it is af s-rfw4bem7+ nx(dsd8k3lbe 2 n/k9h vhdp))

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, thegiz8)rd;p 2z:/gkg odyvl7(s power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit,mxe/o- f.)kdm

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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 ba0u sng2o- ow:nw5cv1jn 1kmv 8ttery of constant terminal voltage. At the mome-govs51w02mn :c8k1vn wujnont 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 inductor are connected in series to an ideal battery of consh)xqa4- g-lkt on0hy 1a* dae:tant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor i:k-yot 4a*eq0gh)l-ahd1a xns

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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 inductxu ;.k:ee5qc+oq m6q zance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 .m 19ydfh1uv mR is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an ind oliw46/i.cth uctor are connected in series to a battery. The time consta/w io4t6h.i clnt for 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 connected in series to a battery. Tgf9)vhbb-crx5.pq 6qee/pu/ u fs(5m-g eob.he battery is suddenly removed from the circuit. The time constaegfxg cfbsrbqe. pu - (/5eu9/o65h-pqbv )m.nt 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 a d;jez,h9h+ jyrr:y6pm1aj 9ept:

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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 v)2bq3ci,z mm an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the c73lmkx)thzx y( bz;rtr4jh, jl0 0i a-urrentr ,lli7krza03 jt;jyh(xt4 b-xm0z)h

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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 fa iga4k,.nm8 ndctor when the frequency dmi4a., nkn8gis tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is do/jvkrr sdi t3b +a20;iubled, the inductive reactance of that inducv0ab ji/rsi;k d2r3t+tor

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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 app+y,j6vu2, o.lnqu+d.q:qn x 5ejdsl sroaches zero, the inductive reactance :j5u2n u ,ds6qsq.olxd evjq+n y,+l. 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 curru8 kr wgkd:;,j 3fxr t(nw9ni6egnfdj ;k9i(ut,w 8x6 nr3wr:k 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 changes by what fac dpu,4 9uw48(pggaaebvv npkta6 f/9w4/8f krtor when the frequency is t6rv,k(9tgafav/pa9gp 4nd pu 8w4k e4w/ ufb 8ripled?

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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 volt0tsjft5r; z;1s.svkdy;h 2fuage across a capacitor approaches zero, the capacitive reactance of that5st.ys 2k;z 1jshfv0r ;;dt fu 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 b414 o *bm+d *v;il7egrhrlkloetween the voltages of the inductor and capacitor in a RLC seridm gr*1o+e7*h4l l4kb rli ;oves circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC cir:-2vuslhtk9 ema3h i0)icar )fqs c2;cuit 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 iz:z. 6n n0ekdkf R increases. Whendnkezk. z06 n: is 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 impeda0a3u3 zdt23frye3 tdknce 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 impedance of the cir*uxv0 r/)fkrocuit 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 circuit, thejq ;r)h gir4v1d3 3rdmv 4ra3a resonant frequenc31rrgqiv43d) hm r4 vad3ajr ;y of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At r rao/du:ia2*k3n zsh0 esonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a seriess4b lw8lsqv3 i1b3 vumy+ p6t, RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of;qn1 3mvdo-yuz fy1 ,f 0.20 T. Find the magnetic flux through the loop when the pl,1 qf;o3vfdyn 1ym u-zane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetq+y hx *:1 eb4qws3a8zmky txr 6ef)9iic field of 0.20 T. Find the magnetic flux through the loop when64z 1th9q*smx e+bi8xq kfya)3ey: wr the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneti:a zj2o w,s-/.;hxrg:tura omq-jz0q c field of 0.20 T. Fin0r:wa/ zqsojrj,hu q.m 2a o:gzx -t-;d the magnetic flux 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 single loop is oc,v;nkiik 9- 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)jlw5rt. yvf-ho; /jv 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 tur/q55s2 2vt0rs1l qihef nbx mfg7x.r2 ns of wire on a square frame with 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 in bhl 5q0gev51t xrx/f2mnq fr7 is.22sduced $emf$.

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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 anym s );(2ypvfbxdu 8/p 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 a)v +eurdm zlc:le2 v.(nd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a loc7. o4iwc 3;eryxnnsq .ation where the downward component of the Earth's magnetic fielcyqi e7;43.r.w snnoxd 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 rotatesd*c v:ue71cqh at a constant angular velocity of 2.0 rad/s about a vertical axis through one od7q1ve *ch u:cf 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 andnvp f0/2d-lqg op4h6h a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turnshe;nps x; (lj+/fcw)o 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 c:l ,p 9;xggf4,vrwwzdm 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.dfw49l,xwp:z;v ,ggr 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 tup-m2-9b lfzbprns 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 generatogbxp1+ x,2 l9um d4dfxr with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 9xdg, m4 +21fuxpxldb$100 \; cm^{2}$, 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 maximunebgca ,j. 1i8m $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance ofnaa0oicrc:+0hb( b3 k 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 mviz )i 8k;v)yv0u6nu eotor operates on 120 V AC, and when running at full speed it generates a ;8euvyi)ni vz)0vuk 6 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 isu u7aqlie5 s(9 connected to a 24-V power supply. The operating current is 1.0 A. 5 su euq9i7la( What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Tcb4tkpki3 (f) he operating current is 1.0 A at full speed. What is kfk4ip)b c3(tthe 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 dmjl9)oz8bk- y.l rme-47jie connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bibmde j 9zk7-e-4o.ll)m8 yjr ack $emf$ 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 transformnz3dl7i uf/eo4 (5 xxber is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow i19uq 3fif so3dn the secondary. How many t9us3q3foid 1 furns 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 primarydnkc mk3;3 y*)nph63d qx(j ,qvaer7y if the 24-V secondary has 100 turns?qrnv,e 6k 3);3pqh7djka3y md* (ycxn

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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-zp9*lmy* b+ai turn secondary coil. If the current in the secondary is 3.0 A, what 9*aimy zlbp+*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 a transformer. Assuming 100% eu b t5nnh*1wu/fficiency, how many amps at 24 V can flow iuntn5 ubhw/*1n 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 -8gixmu 0p/q 9f kzv8qklv:l3 neon sign transformer provides 7500 V at 10.0 mA. The primary coilm 8q v:k/gkz 8u-ql9pfi x03vl 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 oyuxcr8 /ki n w0r-4b4coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltagec k- w844rxyr0n/biou 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 iz q oztmeqjig .dtup(;7)7i0+yj-xp, /os*a and 300 turns on its secondary coil. If 120 V at 2.0 A isi*+, (7mij j)qp xgo sut-pzo.dy e;it/0zq7a 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 j5i*o7cdf4wihas 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 the secondary to 4 jodi*57wfic 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 seco8j4qz,sc.y zp8 i*i dindary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bei siy8zi*c4p8z,q jd.

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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 a,d)+fgm)u 3 ux//yjwqic 4lg100 turns and its secondary has 200 turns. If the po4gqx umwd ,+y//) a 3ufijcl)gwer 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 60 A of current at 120 V. The voeo( :*:hxldp3vsxvuq hw a;)x n:1wv)ltage is usually stepped up to 4500 V by a transformer and transh;edwuspv xoq (xvvaxl :h: :n))w*13mitted 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 A of current at 120 V ve n9st-v.2n bgnpdd2x 2xh;;. 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 thn2d 2-vpe2 ;n ;txv9sb hgdn.xe 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 voltagrdm9bjwus 453ch 5fq +e 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 line if the vcb9455 mrdf qh3suw +joltage 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 of3vb9 zaq6mek+ o p nfy6t0z--z 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 of 100:1. What percentage of the original e6e0 -fzzmnz9yt vab-+ok3 pq6nergy 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 resistajrw jk+uzi-vj . 7r 8u(y l:ts0p:cqo,i)- cwrnce 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 turnuj + w-z:irp:qlurjc 8k)vwto , -j0s(cy7i r.s 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 linwaz7.:d5g(y q vjjz1ge at 1000 V. How much less power would be lost if the pojgzjqw a1(5d :7yzv.g wer were transmitted 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 ecc*3b+hdp5 /q6jyo/g.sqng 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up*gnq65qj sg /b po d3h.yec+c/ 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 (zib3 z:ju+p.lgf 9je energy is stored in the coil's u3(ejpbz g i+9 zjf.:lmagnetic 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 q1b we.b2qw 5d6.0-W resistor and an 18-H inductor. What is this circuit's time qeb d 1w25w.bqconstant?

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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:9x zf4bor3 apge is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet.qns1r0e v73j h 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 resistance of:loi0.sl: vb c the lamps::lc0lb ov i.?

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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 cof+ ;-xpt/yhj6xjm- j8nf5shk+q z496xsp p wcnnected to a 120-V ac power supply. What is the peak current through t n+/68z;y5x fsjhx6hjc w+- p 9mpf-4tkq sjxphe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power d)*wg4:+ - gck n6nsx/dpmz9;jggq -ks7qb xcv issipated in the resistor?cd n6n+-jsqk/pm*zvw-sgqgb g xk7c) : ; 9xg4

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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-W2lo; p/cx /j p)u6cndh 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 resisto- ex l u:io5h3 fkcltw475c6wrr 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 32emhyunew* f//-ntn(yen-yz . d5n p 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 o)8cs -ynbw.*,bpyzi zf a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive re t:dh1(jsz- 8sa 0wdrnactance of 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 14.0 W 86f+/qnt4h epjk s1ng 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 isadms(m 2dhvu*1f/ ;lnductive 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 9x4q dc)p h3v* fmc)ckfrequency of 20 kHz is applied to m p3*))cd49 qxccvfh kit?

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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 t.scj- 619109wb6zix8hjkw0 as;jm vg st dhgv o 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 realr1:/1lijjbrv p4e,(jbe3 f( peqy c(ctance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive r7c-;siwasir:gshu4q izf-18f-f +6vo ycm w/eactance 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 yhpo,*j5k; ci1200 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 capacitorfogz2j,m + cj8qlte: p*y: 0hw be 100 W?0:tw:2y,+efom h*jg 8p j zlqc

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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 througf q/wh, e7 -7zx-hs gzxz*q2;lkyrq8jh a 0.0010-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 indrxva *r55maac91p uiw8 je6g0uctive reactance, and 10.0 i6j1v* 0a8p rr auwe mx5cga59W 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 t aw99v(p ( d6vci9jhh1.0-mF capacitor 9(ahwv9d thv 9j6cp(i are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20zyt08me b.9:wglb xo 3-mH coil, and 1.0-mF capacitor are conne: lzb y9e.xt 3mw0bo8gcted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in seriv h7t/fcbix1.f mf 9sh41x uv5es with a 20-mH inductor, what is the impedance at 1mx 5hcfv41b7xft9uih/s f.1v 000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series witj95u:lt)7sz5doavdsplu 4s : h a 20-mH inductor, what is the phase angle at 1:5:u)zso5v9a47pdj tsl ldu s000 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 witlve 8k05 rlwgh u/;)nxh a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 ev/ux;0hr k5wl)g8lnW 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 n9jc tl4eye3w/ h,xm q2eeded in series with a 100-W resistor and 15-mH coil to get a total imp34/xqcwyth e9lj 2e, medance 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 seriesmm 4dz,b0 op:;tw grm 6x1jkl0 with a 450-mH inductor at 5000 Hz for a total i tx0mmrb4dg;k 0zl1p:o j ,6mwmpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHzqc crtboub/b8 9l,v-4 for a total impedance9/l8,v- bcuc4 tqbo rb 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 sxgt h*1netw 91xon2a cu1pv)0eries with a 20-mF capacitor. What is the impedance at 1000 Hn9* ctn1evtg0wx1a1p2hx) ou z?

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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 /jhwmly9 jy3z /-4fmc capacitor at 1.0 kHz for a total impedance of 45 wh jylf9/3 /cmzm j-y4W?

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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 1q j3:(if fs(im0-mF capacitor at 1.0 kHz for a phas(3 f(iqjsifm: e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at :iqfn:b13kb u1.0 kHz for a total imped:b1kfiqn 3: ubance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 10ke+tv m4mw 7, g;epz9c0-mF capacitor at 120 Hz. What is the phase ;zck,+9emv4tg7 wmp eangle?

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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 150h9v)-e v,x ergk;;jp 5 .wacej0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF) gh v5,;we;kxe rp.v -acjj9e capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF cavg:mc, 3 u:stk*sop:zpacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current,* ot mgv:s3us:cpzk: 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 capacitigwnv0ld 2ag +,ve reactance 30 W, and an inductor of inductive reactance 30 W are connect 0awdv,+2 lngged 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 ciq4z sna y6qyl-axqzw235j4x 5rcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, w64 nx 5 4qw5zqsyaxz32yaj-qlhen 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 s z 6bztm mixq39kro376p*qom2 eries with a 500-W resistor for a phase angle of 37kor39tm iz2 x bm6*zq poq6m$40^{\circ}$ 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 ou6o2yflb.q , = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency shoqyl6,2 fou b.ould the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0a(kk/k9qb yzm q 2u/3q W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supp(k qkqm9/uaq kby2/3zly?

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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 ACnjpo5c35d4 ,rp d9zsr 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 impedance of 60 W and a resistance of 30 W. W;p., /pt+jd*na7bob q2 +lfqdfwee ; ohat is the power f*j 7d+ptf; /qd2ba,q+pe ;o f.olbnewactor?

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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 conohd/y 2.l:+xw bfdf; w)y.ui ntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductoul);ynhof ./2 .b+d: fwwxdi yr, 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 1dvtynv ;9u5pf.rwe8x ;x76mi .0-mF capacitor and a 15-mH coil in series?frn;y w5p ;i7 u.t6xvx98vemd

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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 frea/h. v4thejoq+but4x)s89 i(qlm j8tquency of 10 kHz?)ab. h4mu4/8+j (qx8t h vttljq9ieso

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nee(btke-0 9affeded in series with a 3.7-mH inductor for a resonant frequency of 1000tf(f ak e09be- 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 pl1 o3b 9mhweby)aced in series with a 30-W resistor and a 40-mH coil if the resonant fre9mhbw3 o1eb)yquency of the circuit is to be 1000 Hz?

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