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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following (xf l-o)zx;b n (+oadvare 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 states that t-dk3qbqs /ms) he $emf$ 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 ofnkz88kq 3ngd +qw *xo69kp +ud change on tkdnz 6dn9gkq3 kw 8x*q8 +uop+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 magnenlf te2cv 45+qabu,83 skuc *syge )7itic field through a loop of wire produces what ku8sba cq)l+ e5su* c,gi3 vyte 247fnkind 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 zv kstp*c2 n ,e3(h*kjwire produces what kind of change on the induc 3j*tzp(,2k hnv*ecks ed $emf$, 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 magnetic field 9wcilpz .6 u2wan $emf$ 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 law1 vo7c9cxsx)ruuq2xrt6 +xf, , the direction of an induced current in a conductor will be thav c19 2rxx 67t+,cquorfu)xs xt which 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 horizontal table. A bar magnet is held ab:onhdmjxs 17 vr /9o1cove its center wit1do7 s9mjn/: xh1 rvcoh its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on ac4zj **o5eiuk ay+y1y horizontal table. A bar magnet is held above its center with 5 e4ayzy1 kci* uyj+*oits north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the mai 5h+5sb)ly 4ruk t)6qo e4ebn(quz42s0dfaa gnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced cfn2 iaqlekoabb h4u)dysq4 6+ )s5(50 uz4erturrent 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 taq yq4c4z.l j+eble top in a region where the magnetic field vector points straight up. The magnet4 .c y4q+lzjqeic 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 a region where the magnetic filo : j*gpi1vj v*j-a+8zf kco*eld points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direcfj1p ovzi*jock8l- +aj: *vg *tion 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 carrie9si;oo/dex6i;+ywi ; bcvy8x s an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Whx9 ys eb;w d/cx ;io;i86v+yioen 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 enn8.mgak aonac3 l)yq6l61wqm /qo1 k;tering first. As the north pole enters tcqnl1613 nmw/kao8 aqal6)g. y q;mokhe 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 s rb c6k)jn9g446+yy b jd*acjwpeed about an axis whose direction can be varied. In a region where a unifor4+ can6bj y)c*9j4 dkb gwyj6rm 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 angular sw) p u0lqnpoq3(ieg:1jjar6- xu6+n2jv2r a vpeed about an axis whose direction can be varied. Inw2l:0epg-qnu opv2x) ju a3r6vqjijr (1a 6+ n a region 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.b -6 uusap80zg
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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 te g6gd fhm+o80; zjq6shat 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 mag9t uj : qt* an9xr2nsefw0ajn(fdkrc:0 2gn2.netic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is mov /v pd3lamx2c-8iyj)f ed northward at constant velocity through a magnetic field that points straight down. Make x /c-2 pvam3yij)8ldf 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 angatlb)l9k7fv 3 ih:0kuular 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 transform-tzhk9akw1k d +bgth9zq )4.e /zukz)s

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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 frequency d47pp(tw 4cug dg36jxof theg43p 4dx tjpdc( 67ugw $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tzh w p44/ 9-et8cq: py8k9/heilhnxuz .jqpz/o

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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 that;t 6.z22 ncr*yegreno

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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 con hxh, vj-eccjqr4x-4/ tains more loops than the primary coilev4, xxq4/j h-jcchr- 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 primary coil contains more loops than the secondary cop1j e av75w:ogil thenw15joegp:va7 it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp x 2- o5qg9qrekripk,sw(te;3ut

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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 circud 0t- q.tehhp)it,

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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 ki(nq7z9 yhd do7p-*dbattery of constant terminal voltage. At the momed7(q ydpodzh-i97n* knt 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 co0pk,l)qgl8hrw no y9 3nnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with on3pw)8,llkqgyr0h 9the 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 connect7y nq/; / den/oihvw); tzj.zded 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 c w rze) q:1ganepcpqw4h 896z+onnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery.2dva k, 4q3b7oy h6goi The time constant for the circuit represents the time requ7643yi,bogqvoh a2 dkired 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. c*5kxy;+o.pd htbug4 l2wu o0 The battery is s0+uo.xco h*ld;2ug k4 ywp5 tbuddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same ewyqw56 x0 pq voc;+17og) tfgunits 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 AC power supply. On this qxq+ gk6*qnsq )e03gh 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 supsty qku 4*k;8 gaxyb8zo8g/ +jply. In this circuit, the currenq/b+z8g j8 o gka;8tk*uy4xyst

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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.nrdd6/ gr/8q8f awb r an ac circuit changes by what factor when the frequency rdf/rw rq8n8 .dbg/6 ais 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 v 9s v43ixbh9su zla3+qoltage across an inductor is doubled, the inductive reactance of that inducl3a+ z xs3q49ibush9vtor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the indua ;fs.6d x;rkfv hg7k;ctive reactance of vd7khkr s;f gfa;. x;6that 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 conn 6rga95y:eg+l g5gizi ected to an AC power supply. In this circuit, the currere5z g5 :yigai+9g6l gnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanp83sj(hrxn0c yy, 7eqgp9 2y rce in an ac circuit changes by what factor when the frequencynyp qyrc 3xy 2(sh78,e pj9r0g is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor appro t4 h7jcnydqo: .: 7dnkjzn;8aaches zero, the capacitive reactance of7 c; kn:joddj:qhzy78n.4 tn a that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor i wyd4me 7m)yi;vs(a8 ( bpap*rn a RLC series circu(amvs ( idyw *7)8pberm4ap;yit?

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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 is definei6+y y+ 2dbjeyd 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 circuitc9sqr1 y4ht4x h0q/k d. The impedance of the circuit increases if R increases. When is this statement true?q90 hts41/xqyhr dck4

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the ci e1joy /sb)9e :nd4mv mkilc38rcuit 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 thevmhs9 u4a 1)2rjwb8h;ukd:w ih+ny,i circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double ii0xx0 ac3c tz 7b)8eba/wr *agn an LRC series circuit, the resonant frequz *cxgiba a3ewc08 txr0b)/a7 ency 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 dricyyb .(r s555i6m nzrd3+vc beven 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 ciip44x2 qn ywd:*s83wl-zblqfs v1;i x1uq8kx rcuit 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 magn/w9k*fsn2i st h 6qdy.etic field of 0.20 T. Find the magnetic flux through thesq6nt9 ikw.yd*/h2fs 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 :6zk hs +ja58yev0tixrotating 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 field vector are perpendicular.ts8 ki0 xjaz+hvye5 :6

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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 magnetic field of uq(17 jjgd9(vf1r 5 -vd viokw0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle vv7gvi - 9qodwr1 j1((dk5ufj 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 y 1/pm9 *p j ir:mi*cq*bb)ggpadjustable 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 fr7f hot*fx rk/1m6 w)omvnq;4wz 9-ktdom $4.0 \times 10^{-5} \; Wb$ 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 u xg/f.,p :sj4y rulc3frame 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,g.c4:prsu y u,xf/jl3 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 an7*n sj)wk d p8,qbvux2d 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 aok / p2drof/ vwxl-7)(uc* peind 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 a0s9cf 62rix *ue13 )pjlh qapgt a location where the downward co 93cie*sqap01 fx)uplg2h r6j mponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a cons ucdd*vh+( 3ngtant angular velocity of 2.0 rad/s3d+vcgn d(hu * 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 haq1lnvv wl *w-iaw:8 .) gk+zcvs 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 0(go: bi3r up*yi8 eks100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its 0 bvm0 57mqad2dpsrx8 armature. Each loop is 12 cm long and 8 cm wide. The armrq078dm bs xpdm2v0a5 ature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns vklc/po1e :y1y p5c-zof 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 toms.tr z33j sjh5di .1o construct a simple AC generator 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 .oh r3m.t5d si31zsjj $100 \; cm^{2}$, 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 maximum m wdw-lyt)1)k$emf$ 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 on y 4dnjkz41fa93c bzbazf8ef - - tr0x3 6yunq0$120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opik mx1j/(zf8e erates on 120 V AC, and when running at /ki (ze8m1jfxfull 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 2p0 ,;gdhafir mje+ig*,rs-d ,4-V power supply. The opera,igfr-r m*+;jhgs d ,ei ,pd0ating current is 1.0 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 is connected to a 24-V power supp)mwzgts b;u 2f60d yz.ly. The operating current is 1.0 A at full speed. What is th; .)fm gz06ztbs2ywude 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 v7 :zharnf0 x*is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacvxha*rz7 fn :0k $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage oict /:sy 61ld s*er:wape,.vxf $120 \; V$ 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 flofbif7 pnn2*s06bmq-yw in the secondary. Howis2bb mf-f*nyq7n6 p0 many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if tz+7 gk21rao*w:mpo,dw. f tjehe 24-V secondary has f1tka.j,wz 7*o+ 2d:e pm owgr100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consif )obsy5ddhu3 z:k .s)sts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in tzho.5ks3 :ub) dy)dfshe 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 thqx7 jxdjwf f/cm b0*:y 4-bz,pe primary of a transformer. Assuming 100% efficiency, how many a-xq fdwc/ ,zf0b y p*4mjjx7b:mps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign trans-up7x5;w bj *hb- rlncformer provides 7500 V at 10.0 mA. The primary coil operau*-x p lwh;5-bnr j7cbtes 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 coil and 300 turns on its secon/btm56zbgcm /qnu)*c dar)/ngzu5*6 c mb/ qcmbty 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 vw7amoh b np*2v:c8j;;kg sm2coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the p7g sv8jcw m:h m;pbk22avno *;rimary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2: p u:t92zobp arc:xs200 turns. If the input current at the obps2z ::p :xc2atr9 uprimary 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 eatk*v6mt9m - and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can ex6make-t v*9tm pect 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 transf hu9ai3y ll(*vw;qdik .2; hzi(;xqwdp e3py5ormer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expil3 5z iw i*ayqx2lv;y; qheu.hdp(p9w;k3 d (ect 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 voltage is usj 5uuj4mwo(l*,q k)ieually stepped up to 4500 V by a trans*o(uk) mj4 i u,lqje5wformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of cux*6 u ,qksjv(/ d9lszirrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer anddiks/xu 69(,qjzls *v transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thz* h acs,je-9je voltage is usually stepped up to 4500 V by a transformer and transmitted t- s*ja zj,h9cehrough 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.

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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 resistancev4k+p - zu(yy/. kx+mcf+ui cl of 0.60 W. A generator prodx+z.pcvmik /c fl -uy4uy++k(uces 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 used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0k jbe6:+nvt .a.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to h ea b6n:k.t+vjeating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powea ou ;,nasrcooh-o216//s)imfr hrn 4 r would be lost if the power 24n/6h rf,- ror)nh1oomos;ia a/csu 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 440 V at 20 A. It is to be transmitted on a linlcchuq )l0t32ow5q mxp nn+65e with resistance of 0.60 W. To whatlt2+0p mcluxn hn 55 o)qc3q6w 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 stox cty0o9 p s)ijf7u uq6ct+2:ored in the coil's magnetic field? f+7u cx0o6oi )qu jspc2ty:9t

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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 inductor. yt2miai, q+u 7What is this circuit's ,yumta7i2 +q itime 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 thegbp v ik.ef) ftr:8a55 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 120-V AC outlet. What is the peak current?1 ;h uks.avjm)

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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 1 fs d6iv 26x9dmmie( ;tdkw(a620-V AC outlet. What is the resistance of the lamp?66d;( e2w md9fiksa d(xmv6ti

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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 as l, gcpco+4-q 120-V ac power supply. What is the peak current through the r4l gq-pcc+ o,sesistor?

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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 2or+e3 j kw/tba 120-V ac power supply. What is the power dissekrj3 /+tbo w2ipated in the resistor?

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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 resis;8 :/s; q x8 2y0cil4aj5ehownh:zdj/goeqp jtor 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 resistor isl 8av+.v+uuhq $I = 0.80 \sin (240 t)$. 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 resistor i,9 md7:kbl eu/w zajs9s $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1e5njfk fw j03-8gp tfgwlud1: 0z w 8ml.ao00j.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 reactance of a 2.50-mH coil atst1(0ln 1vkel (gc *ru 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 14.0hhky*sq-7k907 :mk 5 jqc7 ryslcmn;w W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nec yxri/apg473u essary for 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 frequency of 20 kHz 7pjm(b3pmkepn nyf--y f*p+ , is applmy 3 y p-p-m(pkjbne*f p+,nf7ied 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 Hz/90n 0hn97uyel qxp6zqa(yt0q7 f kfn 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 capaci+)ydc(d-s+l3l9no;yk (e w v(zhb apjtor 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 efx0req*) a4h needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactn 0y*(/vkbiftuvp*:2rvb m 8 bance 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 capacitiv9:f*wnolsb1j4w9t f q y z3rdy7v+0oce reactance of a 0.010-mF capacitor be 100 Wo ndzq0fvf:tr9s+3wjlc1b79ywo y4* ?

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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 ca-kl) 2uuuhi ykt5*k6- y2vizrpacitor 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 og5mv+ x5oja22tj: 6b f fwql)df an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capa vf d :q5+j6g5jx2lmbotf2a w)citive 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 r.b.f0 + gdre m h i9g6eb.*jhxf. j6iw,)iyveiesistor, 20-mH coil, and 1.0-mF capacitor are connected vged ,.9x..gy6w.h*ef imhjji0 fe6irbi+) bin 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 resishmcb e k(v t3at4.d2k5tor, 20-mH coil, and 1.0-mF capac kt ab2c5md he3(.t4vkitor are connected 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 bb 4c0 ln46( xhk x:yh)xyly8v20-mH inductor, what is the impedance at 1000 Hz(clx4by :xhb )8xkhn 460yvly ?

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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 iz/(ub5i aiu6 mkcl-/mg:mbv4 nductor, what is the phase angle at 1000 Hzu bm ml5u :i6/z bm-k4/icagv(?

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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 p0hv 4ew3 zcc1g*1w/e wqdqe1)ur, pa 6jou 6w20-mH coil and 1.0-mF capacitor for a total impedance of zqae1w erwud,uw)4 6pqhcopej/ 1g*16 c0 3wv100 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 serie3/e jc d;obud(s with a 100-W resistor and 15-mH coil to get a total impedance of 110 3/u dc;dbo(ej 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 ate+6mofxrxa47vltwv-fs j, w *y ,g+/ c 8uwwv/ 5000 Hz for a totat/7e4/o w6 w uvg+wm8cwx+,r,-vxylav* fjfsl impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz0it fdk9lr;j;vy blrd-xe24ef2s h 0- for a total impedancer;y0j e-0d2lt f;h9elb4f rs2dv-xki 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 inmx iox9ik:d60 , eb(yn series with a 20-mF capacitor. What is the impedance atmyi:x (dn90oxei b,k 6 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 serie5wdir /-yaqnq mf5. odhi-(3 ys with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 Ww3iird/. qd o5a -ny- qyhfm(5?

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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 capaci/v9if y 1smoa8tor at 1.0 kHz for a phase aoa819i/y vmfs ngle 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 resist) ;xw hwxb5/. vn6ovskor at 1.0 kHz for a total impedance of 45 W? xnvs hxk.b/ wwvo;65)

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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 ivv9z4q 6.pq m ac;a/4)xptrf100-mF capacitor at 120 Hz. What is the phase an a/;i.c q)xzrvqpva mfp694t 4gle?

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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 xey msyt(t(13 ; ;xkmkvy+bv :resistor, 20-mH coil, and 1.0-mF capacitorxm;( v+ ;:t v1yeym(xbystkk3 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-ln z :dprk; +9 yihf(d(ali,b of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The ciryli (;- lz9,bpfh(adri n dk:+cuit 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 i0 v*n,g)gb k0ial. mrvnductor of inductive reactgrv *gkanv,. b0i )ml0ance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W, zkpigx:)n5rm9+h0 zkl x3do resistor, a 10-mF capaci:,z km 5gzkip0o3h+xd xl nr)9tor, 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 angle eh5d(ue; 4 zzlou5(ed; zhz 4elf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequ58m ) a+jldpwn)9v1)zi wa nsrency should the circuit be driven in order to have maximum power transferredpjn9mias1n)+rw) )va85zw dl 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 resip* 6wn jidu+ (h5 cyl+*n3hw-ts:u ulustance, 15.0 W inductive reactance, and 10.0 W cal:pnyw t+ *cjuulu-6h s(*3uhn5dw + ipacitive 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 AC circuit i(fi6g2l zdv7 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 j4 er2ug 5;( s( oo*dw4vpahhkhas an impedance of 60 W and a resistance of 30 W. What is the power factordh4p; h kjsu( eo5g2 (*vawro4?

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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 factay2 kv6vwa4q5 0-hwqi .cnc e:or for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 605hv n6a kyv.:cqc4 ai0q-e 2ww-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 am :6ew*/usu1u-ha uln 15-mH coil in series?ehuu1 n s-*a:ul/6mu w

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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 5va3l+4smt c8bpa.lu 4.7-mF capacitor for a resonant frequena5l .+4 sbl8t3cmavupcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH ii fhx3l o0vk(z tqo.( e7+sza.nductor for a resonant frequency of a(xo7k.il. 0+f(vzh s 3t oqez1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor ah8bvlsk k*ne5( 63kdg nd a 40-mH coil if the resonant frequency of the *35k86(dn bhks gekvlcircuit is to be 1000 Hz?

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