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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excep4 trktq7zc2w +t

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the,9q ,l jkw 3e0eqy6ggr*yy ua+ $emf$ 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 kkwljmp9.+nq(vrh)b -vuo * :lvwye /+ind of change on the9u+lv m +o pv)jv/h qe*bny.r :lwwk-( 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 bx:/+2(5xp jey n (h62urx9bcnxeqc fof wire produces what kind of chan5:/nu (ypcx exb2 bfxxj ecr9+2(hn6q ge 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 changb3vk- 4+pump ( xbftd0ah0vc-e on the induceh-f vu -3+dxca(4pmbk0 ptbv 0d $emf$, 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 fubv qm 0.z9va1e;r m6brom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current incc +z9.yk1v op a conductor will be that w. po+vk yczc91hich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a ;8qa mfd w ovvx9poy.ckrt58po0,; ;u horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary8fpaomxr;,5yc8vd.ot;k ow q u ;9 0pv 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 is held aa q79amkx-cas:k6gw q:y 3 2tvbove its center with its north pole pointin6wa cq39qkk -:aa:ygt v 2ms7xg 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 4,:3 psp +vwwzs5gq aoa table top in a region where the magnetic field vector points straight up. The magnetic fig,wspo4 qz p3wv5a:s+ eld 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 l151,xm;wwedlw mgwk l 7 r1w6oevel table top in a region where the magnetic field vector points straigxl l1 ,gww615mm7 e;row1d kwwht 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 top in qydtw l+k 8r2o cnt2vflq7s ,*s+1b7 pa 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 disappeap on1 72yqt*sl+b+8,2wtr lk sc7 vdfqrs?

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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 horpi5 vodwpl8ah)x4+ ) oizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of t5+w8 )4pohpidx lao )vhe 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 pole entering first. akc 2-mr1w 4uo.sj h)o As c .2oah1 kums) ojw-r4the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis w-en)34(i m hi3fsdlighose direction can be varied. In a region wheiih3l n mdse 43gfi)-(re 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 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 an e96*jcsirwu ;gular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orien6u;jew r c9i*station 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.7ojghg fho+;3p8us s9,qnbdt 5e um-;
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an 46dzff9kqoh t 5qq*x1$emf$ 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. Theq.wqqq rui 372 $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is movfgvwfrn/l y+;bc )x./(krqs *ed northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced af.ynrk/+r g;)(q x sw/lc* bfvcross 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 angular ,dzzy+hye2xu9 akr pg 78)kd6velocity $\omega$ 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 transformsa8if))k wz8ak

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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 througho .zd6a(/ ,h/zuq vpmp 60 revolutions each second. The frequency of thedp h(.pqzv/ /mzau6o, $emf$ 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 devd n8/87rmtl suice 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 shn. bht)wgf(17f7q c that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more f7x /n g,gw:zj 8d(zwnloops than the primary coil then it is (/f7gndw,xzw g8z :j na

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondajmth *wen3: h0ry coil then i0mt*en h:3w hjt is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power h3b)/mr*rb n8eu 4 axtinput

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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 2 m 7w(+ji.qd2gpjwc tcircuit,

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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 7t s)t9(tv5cvjoxo72 nobft7of constant terminal voltage. At the moment contact isj)2ctoo975vn7 7t( ttxvbfo s 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 h:b ig8rqp09od/ 1xa nto an ideal battery of constant terminal voltage. d90 8 xbaro1/ih:png qAt 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 is connecxq 5u/l-.6pnq1 f gsfjted to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is co5 bq+ b(y9hid( bnby4an2oc w7nnected 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 ayuz uslt. rb-3 ig pu+87vo2(k battery. The time constant for the circuit represents the time required for the current i p7ku vu3strluo+b 8(zyg2.-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 )k*zkslub 4+gbattery is suddenly removed from the circuit. The time constant for of ths klkgb)z4*u +e 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 unitskh:s 6r-kp eg8 except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an d8azcw35:5pchy 1j pzAC 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 supplk:yx c /)1ozs640g6 jweo naogy. In this circuit, the currento/g6eyz 1:wncxa6ok)o0g4j s

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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 s ayy:sn-/s g6;lp-oiu gf0z 4ac circuit changes by what factor when the frequency is tripled? spy:n--6o zgsgy/f;aus40l i

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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 w z,2 5wfdv(j8c3.sya mdm4jzdoubled, the inductive reactance of thmz jd8md a, vjcs(ywz453wf. 2at 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 voltagjl1viu6(pbpgp n(xy veb2 4/ 2il8nc:e across an inductor approaches zero, the inductivp8xj4y nnpg(2b /( lvv c1plbe:2iui6e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is 6;,r/d)yflr(n y xwizconnected to an AC power supply. In this circuit, the curren(dw y y/xli)6n r;rz,ft

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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 farb:s( gvhih2nc+0 e lv*4din7ctor when the frequency is tv*(l ng7iv rcs:2h4deh ibn+0 ripled?

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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 a;bj l7 8kwgh,zpproaches zero, the capacitive reactance of that ca8k ,jzb7whl;g pacitor

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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 betwo hvsiq b2m8z 0 6gvgm83hdy6ril2n9 .een the voltages of the inductor and capacitor in a RLC6nod0v r 2z93v8b2g8 .gih qm6mhs ily series 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 circuit x ( z,d(5bqpu.3xkjawis 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 .*qjgg7v/ 60lf vflz2q ) qxvlincreases if R increases. 2gqf 0f7vq.*lgl j lqx/)v6vz When 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 impedanc8egtczfbalxl1yiks*1 5 gv/3i + 3;jxe 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 tk vet(tid) fy,g5/9yumo ia6; he circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doub qwb1v63*of5n u nx3y9de7 guule in an LRC series circuit, the resonant frequency of that cirou7xb3unn3*e5qw g9f6 duv1ycuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At re/ ofk0eh6g7o rsonance,

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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 circuit occurs 4s+z pswvvz v:+3drgfv4/ n.bwhen

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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 c5u .ku 6oqfla m8h*o sgok.5)magnetic field of 0.20 T. Find the magnetic flux through thao6f5h.glqokkc8 ous . *um5)e 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 6:vr tgrmhk,v6r2bk *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 fir:r6 2,v*tkb 6kmvh greld 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 r ll drys23jd)slp ,r .umf/r(1adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throumr (dps, 3jflrsuyld12l./)rgh 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 adjustabt+tpf4zwb/nijd.8j0w23 -lc a w-p f kle 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 frov2ton 3j7ql/ot (kg a5m $4.0 \times 10^{-5} \; Wb$ 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 och *ieor;:5.fv xgn -sf 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 valo r xn.-vf5;*iche sg:ue 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 we7 ,jbm u4es1sith 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 arefnkjqob w7/13 a $0.20 \; m^{2}$ 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 +qondc9/t:um+ l5 uexa location where the downward component of the Exde5tnu+m/o qu+9lc :arth'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 tw - y9ww+eq(zwhat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magw w+(ze w-9wqynetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional arbe go;z(pgurt9 g)p;b js2nm,4c2td6ea 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 of 9lu8b nqwb (cd+g1p9hln h8+wwire 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. j8izq* 7t2srz 0.gb6 jpss1 jec 5a(wzEach loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long siqs8 wi *j bs6jjae gz7ptz1r.zc2 (50sde. 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 of9c0/ wulk5 0b6xzj yxi 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 generda(-l n ez/dn9ator 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 tn la9n-/dze(dhe 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 m g8e-ezmo*u7oaximum $emf$ 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 6.00 W. The motor operates onlbo*ec sz: --r+ye4h b $120 \; V$ 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 motorv k1r ckikc 3iq:s,a3k7n0uw 5zyod47 have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full s077uvcn4d: r kkw5zq3k,iic1o s3 kaypeed 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 resist-ik gy/k4-smh/ ku q.nance 6.0 W is connected to a 24-V power supply. The operating current is 1.ikg/--k./ h qks4 mnyu0 A. 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:pu,;ry -okju a )lp;ske,5 whutrr+3 is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back;hywpa5uu-,r +;krj ) 3ouprl: ktes , $emf$ 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 internal34jhb,fvay-d 2c6h th resistance 6.0 W is connected to a 24-V power supply. The operating current dfhc-2 ha3j ,hy vt4b6is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce qg) qqq(0j n6ts1kuw9 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 two4j30 lr ojmg:3 jgb+bpr8q .o flow in the secondary. jo8wj3qj 3m: r.p0ggb+ 4 lobrHow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many tur3i ck;coug7 (, dz-osens are necessary in a 110-V primary if the 24-V secondary has 100 ti; 37(s ,cocg-kze douurns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn iyvuj * vr/(8b,z/s qusecondary coil.rqv iy( s/ b8/jvu,*zu If 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 the primary of a transforsy ci9 w,7wz+zmer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?wsi9zz 7y,+cw

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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 providey3) h4en mu be6hq5qq3s 7500 V at 10.0 mA. The pri65 3u) h4yqhqm 3qneebmary coil 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 q* qneql45 bt3 edwnx3y1s,v. has 60 turns on its primary coil and 300 turns on its seconxq 1vw,3ltnqdsby35e* n.qe 4dary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil a)7aki:w:obz a nd 300 turns on its secondary coil. If 120 V at 2.0 A is applieio:a zb akw:7)d 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 has 100 turns and its sepr 5c;p8h q*sncondary has 200 turns. If h8rpns* 5 cpq;the 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 w52c a1mhuci0qf 8/cand its secondary has 200 turns. If 258 0h/c cimu1acafqwthe input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary tdi8 c:v,m j5kyg: yq*has 200 turns. If the power input ,k8 icq:jy:d5mtg*yvto 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 120w--af3cw8iey(ra/ m 9 h*oxiu 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 numbe / yeo 9c-3*-riah(wuafmx8 wir 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 Vgoe45:b l toxav +)-8orox* kw. 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 loeko xl)bagoor:+ wv- *45ot8 xst 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 1m3ev jjt34+37 d; pscuh-ocax20 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 line if the voltage is not stepped up.vh3a7ojutx pc3 3+s- e;d4cmj

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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 9o cby ynrmbf3ju70l+g7 ht 2350 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not us 3+h 7gjomlc9 n3bu 7rby02ytfed?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A genera dgs0 uwglku+ x)hq1+4tor 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 transfork4dlgg+x1u h u+q0w s)mer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. cgodm4dp,): md ji -.;hmh7 kp How much less power would be lost if the power were transmittedk-: .icpg )74,mphjmd d;hmod 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 Aktu7pf 5 *1njh. It is to be transmitted on a line with resistance ofj5nt7 1 kuph*f 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to 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 t; wt72u4u0v byi ebx7the coil's magnxw2uitb4evy7u7;0 t betic 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 ff)xhdl )*pk16.0-W resistor and an 18-H inductor. What is this cihfk)px)f1 d* lrcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit ph 17tjymo wx(i6cw6.where the rms 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 into a,3 p1qd+7xp4q5iye hjk5ar e y 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. k21u k3w3 eeyi:b6ilq What is the resistance of the lamp 6e qil2e:i3ybu k13kw?

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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. Whathc s.k +w 2q;,cih/awm is the peak current through ih;2m+ck.aw, h sw/qc 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 ac power supply. What 6tjwbqp,-4en - l2evq is the power dissipated in the resisto ,-2w e4bpl6 nvqqte-jr?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i5e+u d5aev pa(s $I = 0.80 \sin (240 t)$. 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-Wxxm c.pug -8.a resistor 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 resistorzd6 3m;xlkr+b 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 aan( r r(ox41mq 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 reac /vbl 8p4a1nhe80qrto(o tb7htu5- bitance 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 of inductive reac gh )g74v(3o.qhbo2rg i;ea,qxu9m i qtance?

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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 fz9bwdvj; 7u6nrjc5m 2or 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequenc4 we;s4zy4 pk /st.pzcg46kbb y of 20 kHz is applied /t46kwk.4ebz zcs4b p; ps4gy 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 d dlhp6o ;og3.eue 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 reactang k-*mi*jv 6a+na ms,ice 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 ow tyjpi-.:0qj-gtn c3f 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 a reactance of 12ned ipv u: na8*yz242hd;9wed00 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 caiu;v;h m/0dw -w3odjwpacitive reactance of a 0.010-mF capacitor be 100 W;wdud3/ o wih0 mwj;-v?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF dxg3o )kyua )tg,0eskt; hg4 5capacitor 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 c6sqwnzd1ylu/( 5 3jqcircuit with 12.0 W resistance, 15.0 W ind6juq1zd s5lyn(c 3/wquctive 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 1. dbw;wd2uf d,500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arf.d dd,2wub w;e 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,zg)c zox2h7i 6 20-mH coil, and 1.0-mF capacitor are connected in xciz 6gh zo)27series?

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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 , e f*jmnko-khwibd7 ewn/9 ;x3(kmw /series with a 20-mH inductor, what is the impedankwk (7ob ;,wwxkn mh9ie//*dm fj3 -ence 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 ser)hq1iaib q8w8vf 69lvkr vv,5 ies with a 20-mH inductor, what is the phasf5v8kr8i 9 vlb wq h)1qvav6,ie angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF i3e(.fkx *rnjcapacitor for a total impedance of 100 W at 1500 nj(.3i*k exr fHz?

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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 cap e4d9(;qaoxhqoooe s/vm. y7z8o +5vmacitances is needed in series with a 100-W resistor and 15-mH coil to xv aeho+m9.o8m(z4 ydvo;oeq7 s/q5o get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series 9r fmx59o3. zekht2ktwith a 450-mH inductor at 5000 Hz for a total imped 5kt2z 3rmetf9 x9kho.ance 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 serz9xczoe; +)c l/6tqfpxjdx/.ies with a 100-kW resistor at 1.0-MHz for a total imp.j9qxd clp/t xe+/z x;) fzo6cedance 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 i sx0sam+ -zb*jn series with a 20-mF capacitor. What is the impedance at 1000 -b*j0 s+ma zxsHz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neededxxtr:3.d0q 2jxa1cgsbfpdeh/x;/kx. 2c a /a in series with a 10-mF capacitor at 1.0 kHz for a total /e; a .c2f t da0xcxr gbx2a:hpkjd3/1q.xsx/impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 iklf:l mq*gm2fe7q8o i5a26 ikHz for a phase anglek8aoemi62l m:fli*q g27fq5i 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 1.0 kf;sr4jci*z u6Hz for a total impe*s rz 4c;i6jufdance 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 at 120 Hz. What x9nj2gtsb ze5/ j /aeie i09/bis the phase angle?b/exaii9 b9n 5/ gejszt 2/je0

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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 100-W resistor, 20-mH coilxq7s*r8:/gzsa tsg g 6, and 1.0-mF capacitorgss6 /gs zaxrq 8g7:t* 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 q*vi6j a2*o 6uepzmh. 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is t6 *o2hv*a.uep 6qjzmihe 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 reactancom i pdp3c6,cw8f 7k pzai(stus /*g4.e 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in thisp.4 pc/kowugtz i*m8fd(67ca3 s spi , 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 kbf) o )nn6qv4RLC circuit containing a 50-W resistor, a 10-mF capacitor,bknvq )64fn )o and a 0.45-H 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 for a phase angl5u-+h;m -hldlvn0qzi raur:, e of0u5nldah-+v lm,z:i;rr-q h u $40^{\circ}$ 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 hax 0 pd skt137g+gook.hwh4y k0s R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driv43k0h ohw1 0dpt +gx7 kgyks.oing 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 hsm r22/g)b (4ha npxhzr*++lss jpibnb+3q 9in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capn2rh(*nlg2ar xjp m9phq3 +bis hs/+bb4z +s)acitive 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 8;uzs(qnpyh- xbx.e)AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W an 9 ( xlwzqwshlo*p nnj+u.j.+)d a resistance of 30 W. What is thehqnplx. j ).+sww o (+u9l*zjn 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 /ed(4p6.+y ys siumtt5 s osg(circuit containing a 50-W resistor, a 10-mF capacitor, and a 4i5(p6y st.ose t/y g+d usm(s0.45-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-mue70oc v2c mf.8y4usbjpvf5+ F capacitor and a 15-mH coil in series?8e2 .yofbv c f+usm450u7pcjv

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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 seri0n*bk i;ww,fv y.kb3zes with a 4.7-mF capacitor for a resonant frequency of 10 ki v0bbw.k;* knzy,3wfHz?

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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 ser17;/9nqjrejnz ge;dbt 1f vb 1ies with a 3.7-mH inductor for a resonant frequency of ;jt1 9 ;11b b/gnjqvdfzrn7ee1000 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 place jhxx djmwr, j5vch42njm u72t 5/-5vbd in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hzjhdmr5j 2j2j / b54-cwnxv5h7tvu,xm?

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