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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 arny47n*we* d /- qeanpse units 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 st+ cejid,yra*l 9 .kg5eates 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 in a coil produces what kind of change onvj9o6jvmh6-m pu* ;w h th w-ohjmh;jv69mv*6p ue 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 a loop of wire .fdg2 uo+1zi2qmy :ai) yy7ep produces what kind of cha2 y y.+ eadu2:gfy1pqom 7)izinge 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 change m6- *s7b 6sgfirggy; gon the inducedf g;r7 gg-s *m6s6igby $emf$, 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 mag61w0fjjg s .lhnetic 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 direc+ s1g v+y+m8ontjuz:,fj0 2x- hyqo hution of an induced current in a conductor will be that which tends t- xsqj +u1u+2vzo8 ohyjh0ygn,+:m f 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 rsb +ht1m6p z9p9n/md horizontal table. A bar magnet is held above its center with its north pole pointshnd9p/+brm mp1 z 96ting 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 tablej1i.1ot6 3c l arided*. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the clt6 .3rjaidd 1c *e1iooil, 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 whe0e, ychb3t0nkre the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as they0 ,3ck0thenb 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 l7)z+umm7 kx m: wcmu.mevel table top in a region where the magnetic field vectom+ukzwm7m7u x.mc):mr points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table to 8j vf-fslte)4p in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the fjt vl48)e -sfdirection of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing f m90.gge(es,,5fj b(+z+ nvhrh mazrcurrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When5g re+hvzhm((09bm+nezs,., jg f raf 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 pouqf dhzlv-41:pm3l.z 2lw q2ole entering first. As the north pole enters the wire, the induced current will bmv: 1f-ozw2q2zpu l hll3d .4qe (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axi 4sz8zw: xvo9cmv/kx6s whose direction can be varied. In a region where a uniform mxkz9vxz/ o4 8c:sw6vm agnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at consu8 dupodzjonh0 9 s/-0tant 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 rotation if the indu-psodnho/ u90dj8z 0u ced $emf$ 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.v ahd7dd mp2tw11q (/f
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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 tha ;2k ln;0kui0ry g3;xkjmpa)vg)rt ,rt 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 field. *s hzk (gz,waqj)r./ nThe $emf$ 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 (orienaukb3c 09e1 kcted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrosb0cka9c1ku3 es 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 ouh .qc vt6ljm9wat./r(wf/+a8 eq-c 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 ,qv:8zm .sxu q,ka:z qtransforms

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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 fb-m9e n414rtmqd r;(up+f reorequency of the e -+4qr9e4tru1pm;fdnobr (m $emf$ 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 devictn) ) 5-ng*f:jfm pbase 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 t6jnns/ s+kslt4vp e 3;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 secondary coil w;pmnb gjp (7;rwe 35fcontains more loops than the primary coil then it 7pwp ;fgrb3ewnjm; (5is 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 6*xw vnru, d)zmore loops than the secondary coil then it is a, dr)nvu 6x*zw

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, thec1kl4 a1u cjp,zg*g f3aj dms1)c5(zj 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 circ1,,cd qs x5jmy was34cuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consta 6h gi+*zw pznq7szt 164m:iifnt terminal voltage. At the moment contact is made with the battery, the volt+w:nsg6m6 4zhp fiq 7i1itzz*age 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 conue/phm69 /vdjowv xuev9 c15l3 v s+7fstant terminal19w /fxvl9oe3du7he+vu vs c6 vp5/jm 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 R iswz 4g;x5 vdn1:lsj.txybi q,1 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 v5/d hrxf1 au9is 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 79g zng:rio) 5njfat9series to a battery. The time constant for the circuit rep:jgno gia7599n)t zfrresents 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 inductousqz3q2 j9:e d+r yk.vr are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curren3 yqj+9uvqr.:d se2kz t 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 exa w44ygnag aw0a iqv3(c;-,aecept:

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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( s9kd(m .m*y ,nh-dem8gsrzf uha+t8 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 ci/w* zn9e 6xdjircuit, the curreni/*zdnej9 6wxt

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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 factor bpj,:q+6ukj l when the frequency is trkljuq,:pjb+6 ipled?

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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 voligz *vv,;rx)cj v n79ttage across an inductor is doubled, the inductive reacta ,rv7;tx) 9gnzcijvv*nce 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 ind j32p+kaw-l+ eph rzqzm: (r 3m75sldnuctor approaches zero, the inductive reactance k3zaw(r+p+h7 3plmr5n 2 d ljes:mq-zof 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 cirmhxo-1;zvh c cs5zs+.cuit, the curre+5;co hszx v .h-ms1zcnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance iv,yjrt g ye:i:p zu.th,y+ *v+n an ac circuit changes by what factor when the frequency isty:ve zg+*:rtyij y.pu+, h,v 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 ac / tsyolbhg(:b ,6bo,mross a capacitor approaches zero, the capacitive reactance of that capacit(gl,oom,bb:hy st b/6or

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in 9bau ye31 3g qz4yxk(so*t 8/myfmv 7sa RLC series circu /mm3ykyf97uys 1vx*(3g zb8esoaqt4 it?

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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 ahnitzh.r*d dm . 4,,zqn 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 bm9kk(4s2 qkgag d ih+9+ dp7tincreases if R increases. When is ++ah(kqb2tdsggk7pm4 99kdi 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 impedzxwxn s ilp pv*5i,w.w(rz *56ance 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 circuit increases 3piqk6: nfq.:;vwnr uif $X_C$ 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,lxd 2dn3th/w x(-gju r:q gt0( the resonant frequency of that circuit wdqxuh/(0wnd :ltr3tj(2xg g- ill

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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 drivenytk/s+ ;e muwgggzu4 3d9q4; h by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuy bfhn*wi5*lq 90,uibit 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 ./nx m-k)ee4blpp f+ya uniform magnetic field of 0.20 T. Find the magneti) ybxp4kme/.e pnf-+ lc 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 0.1.8r u*qre08 v p6hwylp0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic qw86v8l* eru.pr p0 hyfield 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 ic xu.dxe1(lt5i: o j6uu)zf+ bm.wza:s rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the +uu6c.izx1 5.jf:wdx tuzo b e)aml(: 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 a4rd)1phuch nzqi 4 e9d4u8q)erea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes flzf1 )cqmpeql* u 9.1nrom $4.0 \times 10^{-5} \; Wb$ 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 sides 1dqux:lq 64eul)vp inq m0 8q-28 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changesm-0q8 xv u6 d2upeqqni:)4lql uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an arekz , ))dislgdt/n95qzf atk1 .a 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 are:+m0whr kuz21 ukxt.j dz4vu0z8 +ww ia $0.20 \; m^{2}$ 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 lo4y i6aje mf2d/cation where the downward component of the4ymif2 /jead6 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 constant angulvc- na0boj /h3a4(upiar velocity of (i -uaj/cav043pobhn2.0 rad/s about a vertical 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 cyou;/ py* 1wk4qf*jd has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns oulf 4;qr.d x7qf 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 x0 m 04b64fihepjp v+son 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 uniformi44phxm bj6+ 0svepf0 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 tur+i;ok(w-x rsz ns 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 with an output of 12 .d.idz8eu 0 oap(3y6bhozgt6 V maximum when rotated at 60 Hz. A mag86bo(yzz.upt ih 603ed d a.ognetic 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 ma1gdtg;u6c j: sximum $emf$ 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 of 6yavsqw0) 2so;xbz4) s.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 v n.f9-076(t 6mvhekcpyg jx uof 6.00 W. The motor operates on 120 V AC, v e609y.vhj6utf7 xcpkgmn-( and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power szt** 2da +km7s os:tbeupply. The operating current is 1.0 A. What is the start-up current? sk *omes+d*b27z at:t

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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 *uk84 le x)c9gdrw xq*connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is) g uxqxw cek*48d9r*l 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 24-V power supplszi3yn;n vr-io6s )+iy. The operating current is 1.0 A at full speed. What is the back 6)o iis si;3v+yr nnz-$emf$ 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 r7 iy+akus4tp s 7jadx+ 7z(hn+educe a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in thx+184 k hxzcovhbku*;9 y t-tfe secondary. How many turns are in the oykxu1 zxt;+ 9bhv-h4t8f*k csecondary?

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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 primarx47d daxwlg-. qv4sv9y if the 24-V secondary ha.w 9sd 44x7x -dvlgqvas 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 a 200rxg32:epbuu3gt* j/ she38w q0-turn secondary coil. If the current in the secondary*u2:/rge3juew g qts x8bph3 3 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 ny f;xeb.4/.mxrp9 wea transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the s.n.xbefewm/ ;r49xyp econdary?

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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 transforr4sm:;z7v ouz mer provides 7500 V at 10.0 mA. The primary coil operates onom 7zr4 ;uvsz: 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 turx cbp*2j47fc b3 upet:q7.xd;xsrd3lns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present i;d 3p7 cursel2p7f 3 4q.tdj*cbxb x:xn 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 coea 7l./dm(voi ch :uulz65c.lil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curren ml/az6:hvcl5 lc.u(o.uedi7t 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 tg 2wk)z;a k*ss zdw1a6:ucrh7 urns and its secondary has 200 turns. If tg;wk uh1 :2z6cs*z) da7wka rshe input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns a -aefmb,l:d/bh30but xf /-dsnd its secondary has 200 turns. If the input voltage to the prima0/ bf3 d-l m dubbt/:fhes,ax-ry is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20+k)c38/cp0zwv: vvcdzqb5 ig 0 turns. If the power input to the primary is 100 W, we can expect the power o5:+kcv0zivgzq8 /p3v ccw )d butput 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 u,h-wizqmd)1 tsually stepped up to 4500 V by a transformer and -h,qw m idz1t)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 A of current at 120 V. The voltage g/vc j -) zstcgbb*;s/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 losbg/jbg-* s) vtc;s/cz t 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 step1c4 wt)p t8hgsped up to 4500 V by a transformer and transmitted through a power line of total resistancet84w1gs th)cp 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 km long has a total remsdk/ awp; *ydl4, dk. krf(v+sistance 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 steppks; 4.k/v(y a ldf+p*mkr wd,ded up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistan+p3 7ncjslkr*ce 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 of 100:1. Wlpscn7r* 3 +kjhat 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. 7jr0bsvrm4mx7 kopy7uo/66n How much less power would be lost if the power wor6v7k brx/m4jp0 7 snmuy6o 7ere 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 440 V at 20 A. It is to be trh ( g+,esm7zqhansmitted on a line with resistance of 0.60 W. To what voltage must the generatorzg hs(+mhq7 ,e 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 stored in thuusv x*yhz1y o5jl6). q7z bh7j(d fsa-*xy4se coil'* l sf x7u4s) jzy*j(zdo-h.x q5sya6 1ybuv7hs magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H intfy 2/9ung z2nductor. What is this circuit'syzuf ng92nt/2 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 rmxcwzd3m(/;ob s voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed injirdm*ytd0-)b l+4 a mto 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 resistance of the laz4x,hk3u xmq v m-ef5pz (vf.1mpxe-,zmfp k1hux4.vv z5m3(f q?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the pea 0) fk;uoidxhb5-tg(qk current through the resistor?u; kof) -qi(bgdh0x5t

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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 isfmjs 9-wwi 1jr,xb. * +sf:fvl the power dissipated in the resistorb rf,.x1 s9*: ijv-sm+wflwfj?

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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 50iw+hv6 uf-, ip-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 resistor0u*:rdynjyi- ;mll o0o 9 xa0w5-hujn 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 9pkm:v7u,2 o 0x*xupzjscw;o0oxt3z 50-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 a: 4psnnafq0sc1*q:.hxz .h)t m+n rfof 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 r id;f17ksvm*fkil: *w3k z.aj vft.5e eactance 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 of1bh v2pm9q*fy;tp k p2 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 reactance at 1000 H*oji 2(o yed1xz?

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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 wh5y mg j3q6ba3fen 120 V AC at a frequency of 20 kHz is apf6gj5 by3a3 mqplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hzv9ma+t di)kp ; 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 cacl,rzo) l;3un pacitor 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 Wmg485 en x6bcj of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have aso (9 qmiog3y( 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 capacitis(/l2o*/e woxhydl t45ix/ r vve reactance of a 0.010-mF capacitor be 100 W4oe y5sl /*d /lo wx/2ht(irvx?

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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-mxrx); or i,zyz0y810 c7c9c bdunfoo,F 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 ozj x36j+icj( resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactj6z3x+(jocj iance?

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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-qkj2)2bdd d.l0bin/ fW resistor, 20-mH coil, and 1.0-mF capacitor are con20kdb)n2ddqj./ lf ib nected 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 1n)ox( yfbq5d:j j(l4r00-W resistor, 20-mH coil, and 1.0-mF capacitor are conne:)b jjx45nf((r lydqo cted 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 series with a 20-mH inductor, wha 1-rror.1biu4t8 y kcbt is the impedaub.1b8c krt-r1oir 4ynce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what x,q)yi2qmo5 bv2 lu i/is the phase anux ,q/2m)y ovbqii l52gle 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 q56j7gp7z wgxamtxp9a kt,1a(o/)yl a 20-mH coil and 1.0-mF capacitor for a total impedance z 1,p7o)gqlwa /7t xa9 gj kmatxyp65(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 with a um9 u3j/ i;xbzi: yju78pln+ r100-W resistor and 15-mH coil to get a total impe; z9+:lujm 8xri/n pyb3iuuj7 dance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a t x.mzk72;a+6z uso l2yk2mkav otal mo7vkklu 2ys .z ak;62x +za2mimpedance 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 seq4cir19w c+cw7ib4c5r dhwt7 ries with a 100-kW resistor at 1.0-MHz for a total imped71 wb7c5i 4+twhw qircr9dc4cance 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 capacitor. d(h6)3uhzmt2 -m hevj What is the impedandt )u3-( hzhmv2ejm6h ce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a to2 q -1b+zenfpktal iz1pk+ b2f qn-empedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF 4 d)*drguu yx:capacitor at 1.0 kHz for a phase anglr uxgu4 )ddy*:e 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-b1 y4l;c5qbre aivwl7gq 20m6 W resistor at 1.0 kHz for a total impeqw7ie4q51 b;gl0ybl6carvm 2 dance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor ap*/5 e3w qrwts* *ojpoe+t/fqt 120 Hz. What is the phaseo 3e*//tjtq q5r s*wwp+ of*ep 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 gr4iko3jy5wup9*))nad1sx y w/b8 z h100-W resistor, 20-mH coil, and 1.0-mF capacitor are g4wz1 5uay)xysi*rjb)dkn/o89phw3 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 100n2yn, mg38dzrzqjx c91bo;/ b-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor.ndj2c/,;gx9q ozybrnz 1 38mb 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 capacitor of capacitive reactance 30 W, and an inducto)qg7t3y iyx6- *2i9na/waj2f r d wxqbr of inductive reactance 30 W are connected in series to a 110-V, 60-Hz powet2q6)f3rixd n9yaw*/a jqg2y- b w7ixr source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resi(gu n, fdfy)q4stor, a 10-mF capacitor, and a 0.45-H inductor, when connec ,fgqd(fyn) u4ted 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-se*;y*,ynglrwmkb( 1 W resistor for a phase angle ofr b**key l1mwg(n ,;ys $40^{\circ}$ 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 = lqky8f +)-kvc; le+wp20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power trans+ wl8+p v-yl)eckfqk; ferred 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 resistf49 8aran l8tpance, 15.0 W inductive reactance, and 10.0 W capacitive reactance8aalf8 9 ptr4n, 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 AC circ ss( 1ovk*vff eu5m*)ruit 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 impeda5 :gy3seikx2s ck k+b:nce of 60 W and a resistance of 30 W. What isxksic53 :bgk2 eyks :+ the 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 for a series RLC *n-bkif5(nfs o*k s 1gqh-yu*circuit containing a 50-W resistor, a 10-q*hg1 f-so-yu*k5* bfkns( n imF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mHs4kuqojx a3rrk4(wyivo g 8 .x0))/pv coil in series?rqj.( o4vi xwx/ 83u pgvo0sr ka)4k)y

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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 resonan ny t02x lk08+k,dnqjdt frequency ofxd0t ,+y2dkq8l n0nk j 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-m.nwl otjc 0u3 qy9y*4lH inductor for a resonant frequency of 100 n03y9ytjl. *q4col uw0 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 serqt9z er9,s 4mmies with a 30-W resistor and a 40-mH coil izm ,9q4mts9er f the resonant frequency of the circuit is to be 1000 Hz?

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