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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 )(kw zpr x*na jku;-b;are 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 t )-h jh1 )labjd,ry)oz znbm:*hat 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 k nepic* 5f dfh-x eh+()5es+qzind of change on the indi-e fs5qfc(znxe++h*h5pe) d uced $emf$, 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 produc0s(6w/os e jides what kin(id/wsjeo0 6sd 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 nm8a4i dx6ez onfu3 cy0b * 1i/tcrzni3m 90:iof a loop of wire produces what kind of change on the inducef3 xaib*eri0/cdti :mozn386nyzc n9i40m 1ud $emf$, 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 .dwymhgg. 8rm v or tuemcjhin 557o0 4o9;q/;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 in a conducto/a2rr 7yi (viyr will be that which tends to produce whiy v2r/r7aii y(ch 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 horiz+tklml 9xt 88nms8 -paontal table. A bar magnet is held above its center with its north pole pointing down. pntx89tm8k+ l8 msl- aThe 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 horizow6cb02 jkv v qmaw3+b/ntal table. A bar magnet is held above its center with its nortw0 3/ vcv6bwq+mj2kabh 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 o)v:gwsgpp1 .a table top in a region where the magnetic field vector points.s1w)p o:p gvg straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level t br1)knu .(it6s uu2af9;nhniable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, 6 n(2h;an i1uk sbru9u.)tn ifwhat 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 horizontaqx /nvi (n34wfxf)(2* vi w arq)pbzw3l table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced curreni 3(x4fbr))aw 3/wvfv pniz2xn(q wq*t 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 .j0 jyfnotm 6sl-r 9v7current northward. Two coils of wire lie flat on the table, o tylnfr- 6smjj7v90.one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a lsqj 1yh*-4xhsf s+q) uoop of wire with the north pole entering first. As the north pole enters the wirhqsu j)*hssy f-1 4+xqe, 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 w/jfg:bw*42gtn 7dbu qgyh, g0ire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if ty/ bwt*2,0 ng4j7gb:fh gugdq he 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 cx 69pw5)ul3yl .lx v*yzpe y4gcy5p p(onstant 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 pv( gyll3 .ly yc9*yw)xpep6x55 up4 zloop'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.zqkrp9ux2 g(;.sk ac .
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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 anb1exz s63kb28wq yh8ne z 3fj6 $emf$ 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 magne8rwhsu)vh (bcgy3 u- :k vkl6 ahp9u(*tic 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 mo6-)rec)n wmqq/yfo u2ved northward at constant velocity through aq om-6cq))r u nyef/w2 magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velo)f-vnb k g9:p7t1 jyuq; lgpwsr.vw+*city $\omega$ 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 tra +fp6ss: wsveo ,21(ddpywg1 unsforms

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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 frequency3uds8,68 xxfqrdhes 76 nh r3e of the dhxd38erush7ns8 x 6q f 6,re3$emf$ 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 totqwpq7 w.z 9eyq4c:hv -uc :*i

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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 deo(o-2zxx ql.klv8 yrk3 kk4j.vice 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 contaib(m 4*f 4pagldik5(os ns more loops than the primary coil then it i (g4oiksba5fm *(d l4ps 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 secontq5 y,g2bh 23ztrsgh5 dary coil then it is 3r hqhzggs yb2 t255t,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 1w ck0*+gq orkx6u 44pp3i xykinput

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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 circunsjtu3:ntn.klh3i 25 32s v zdit,

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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 bmqhe+ ;y;xt(yvbe/ 3zbu c*d/attery of constant t*vc;(/ myb hqy;e/bed xz3u+ terminal voltage. At the moment 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 obfh(;(+r+a3ptv w j zconnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage a o(jtfw;3( zh+vrbap +cross 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 .tf*:uk7 hc9mxdcr.r inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connecd.ffd i5qzp-da3y7t 0ted 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. pdbx5/h : *arjcc4b*aThe time constant for the circuit represents the time required for the current to reachh cb4 x */dbjcap*r:a5

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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 5 jzd67elhsq*battery. The battery is suddenly removed from the circuit. The time constant f ld 5jhe7sz*6qor of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exct s4:apah:;p7rf ms/mept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectix73dzqu1 iaa. p 8-egak:w4 eed to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circu,b3wr;g,t y;7r z9bbq ksih+ mit, the current 7,;rbmhg+wk r;bt sb9y,izq3

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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 when thad/a v-nnc-pl l/+ e4xe frequency lnadxa+/lne4p-/v-c is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductt;o+14n.9 k p mnfrl2u m)qylcor is doubled, the inductive reactance of t);1mq 92mp+4knl tnr. y oculfhat 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 inductor appr-,zj l: bdby+gt1v g1joaches zero, the inductive reactance of that 1dy+j gtzlv g j,-:bb1coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, thchi, *nsq62 /i3mjgs fe currentsc2g 3s *m6j i,ifnhq/

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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 fac4vis4o4vu n fr tpy11:tor when the frequeontfypr: v v444u is11ncy 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 thj- ezkm oc0x8ca3:0en ae5,n z9n+i oie AC voltage across a capacitor approaches zero, the capacitive reactance 3 n0 e zxiamn8,ke ie:-j0+a9oz cnco5of 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 betp5e wgrw,psbdf,3 b :t..xm*lween the voltages of the inductor and capacitor in a RLC series circuit?w5s3 ml .redtb.f, :* ,pbgxpw

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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 defined as uj(kw5w qvxt+m36) ve $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increab/8v; *ai :+fm*c mn s2hevbbises. Whehsf*; 2+ vbbc m/ ni8b*vaime:n is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circs1m.fzs;klc6c f u u8.uit. The impedance 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 circuit7tbw z9cq;hl1f 8i j(k increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an uaoos5+;u *(a1 /; zfy-aadv x,astjqLRC series circuit, the resonant j+s 1ov d,aaa(qx/*ay stf-u;u5 ;ozafrequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At 6b*o44 w xsg nf;w1lrkresonance,

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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 circuii1ock ps nzl.:*eai8, 1m7vvut occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of gem ag ux.d9;z3s+1ahb * woz:0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vgsh z 9m;.g+w ouzbax:e 3*da1ector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magne; blgbtfk/ 4h:tic field of 0.20 T. Find the magnetic flux through the loop when thef l ;/hgbk:tb4 plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radkk6nt 0/xvx9cxs;/ wfius 0.10 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 field vector xvx/9kfsnc;t/xk 0w6 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 are7-.ga fa:+efgst3gn da 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 from ks;)t4-9jng e sgraa;wz8 z o/$4.0 \times 10^{-5} \; Wb$ 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 w8v imqjp -/+sxa (d;n200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field ;vai qnjsp-xd8(w m+/changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns anduyn7(u4 :ch4 x5fek6sqht4 n4p vz4hb 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 areahmg4hlv; 5p i4 $0.20 \; m^{2}$ 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 horizontallp .uu4o9.s6 cz( g/ edzmfrzn8y at a location where the downwardd.(ouzsr6zz4 gf u8pn / 9e.mc component 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*50a- c nvhj3xos d/tf at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its endsd0a hjcnof*/v- t 5x3s while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50( smhj; +ej3midc 91rz)+gcvb 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 tu/-t/ )ss djva d9q xxdzomoi:8,30xngrns 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 akp)6+s5kmh0 loc7 vv8m gv rs/rmature. 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 rh+gm8vm0kl c5 /7 6sr)svk vpootates 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 consiuo* blscn;e :am)e9)5 w /ispht6g2xcsts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 mb rmzayu1f9wrejzt)lns / q9j34te)l8 3x:(construct a simple AC generator with an output of 12 V maxil 3(e tjw/bzqfujmty8ar xn)sm19el4: 9z)r 3mum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator witzb5tb5js;6 -w1 f c8up9fe qszh a maximum $emf$ 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 operatesr l0 nf0oism7c2c7d di.z bf17 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 jf:)5l:2y,x)mero7fzq6iq a kx w 5 xwhave a resistance of 6.00 W. The motor operates on 120 )x,xo 7xz5lf:fa5wej2) qmr k 6wi:qy V AC, 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 reso*m;d 54mc1b) tckewoistance 6.0 W is connected to a 24-V power supply. The operati4o*c;b5wo tce )1dmm kng 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 connecpp(.u(w p3gxig.g 8f gted to a 24-V power supply. The operating current is 1.0 A at fp(( u gpx.38gfi g.wgpull speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resista9t iy jc5 lg43wbb(3zunce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at f 39b5b( c gluzti4jyw3ull 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 g-5p+xefm-vr )flu; ya 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 primrcjk ;r bs 2co9fs)b h,014nviary of a transformer causes 14 A to flow in the secondary. How many turnssrcb0 ok,rc1; b)f2vs hi94nj 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 mlf/bi., rkk3;. ajt8d/fd swiany turns are necessary in a 110-V primary if the 24-V secondary hasfsk .8/3;./afibkrdjli d wt , 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* jjci- az3iui d9r)5t primary coil and a 2000-turn secondary coil. If the cu-z)d ij3iujr a5*9ic trrent 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 ,s bdda 3e;/ccgyohy :2d;e9ctransformer. Assuming 100% efficiency, how maced eh;b3s ;:oy, d9cdg2/a ycny amps 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 transformer .( sqdth+im.b3 t xrbg vt1h*,provides 7500 V at 10.0 mA. The primar t +(3bis.hgmtv.1xrqbt*d ,h y 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 has 60 turns on its primary coil and 300 turns on its seconu0f,rtsxl886k ; g/xqm f1mesdary coil. If 120 V at 2.0 Aqe r1;mmxl0 ut6x8sf ,g s8fk/ 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 w.cr*;/wsghkq 6of (aturns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is prqsc ;/w .ahko6w*gf (resent 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 (n) j8pap/udt 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to ) n/(p8djtu apbe

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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 mf j75k)7:ymk jhqtw/ turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secmqj j /k:whtf75 km)7yondary 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 1 fzj(j5cnty1; 00 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionalj(cnzt j5y f1; 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 *segyz /oyrg0/f7 8n qof current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 t o/fg7eyn *r8 qz0g/ysurns.

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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 cudm0asve+nx,, ;l j(ozkgsd54rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitte s ;zxg0 (5,4,dsm+ndj vklaoed 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. The voltagewpml* r:ez+y1ft- )r z 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 ew*zmft 1 zy+ p:rrl)-voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gene ;4d6q kerfi qdu)6w1mrator 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 transformerr 61 ded)6q; ufki4qwm 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 0.60 W. r*a6h v 3sas8lnzwm08 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 enerss6awmrn *3 vlhaz088gy 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 pow4h z87w+dxb7bdek,nw5l +xt7 ass c5ier would be lost if the power were transmitted at 3000 V5swb+s57 z i7t8dd nelkwxa 4+chb,x7 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 transmittedziq-c3w5)pveax l7j- on a line with resip- w z5q)laxv jc7-3iestance of 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 the coil aagyaqyt --xdw;tn y):5uk 31g-u n kt:3x; 1-d yytawqaay5)'s 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 inductl1m r,k+keu5ko7 ky: fv2z0jk or. What is this circu5:zl1 y+m okkk2 ve,uf7rjk0k it'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 where the rms voltage ks cl,:o dlj 3i6n3b(his 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 plac5a81wr1 frc 6dso uu9ded into 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 i, /qwq muq*0y xb)vm-lamp?bq-yq*wu /mv0i x),qm

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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 connn0 ,7 ytoxmia i+.5k(myu3ld tected to a 120-V ac power supply. What is the peak current through the r0o+.7l5 3mta, diuyi (kn txmyesistor?

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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 12 iutk xfn7u8a )wo; 13zhe7xa60-V ac power supply. What is the power dissipated in )u;wixfautn7 18z7k e x6a3ho 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 5 2q( igz109fyqqjby :x0-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 5i 8zr/r8kv.p m0-W 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 resistoj4df aukh.+( qr is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inducto hhf2ul z2w63 sa rje+/l1pi4dr 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 at 1000 Hz i6d)- kcef-g*6ynhfp cw62lz?

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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; 3whpbu t5r*b coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 61 u r:jjasdg0a( zl0v157 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 indunr .( .o8 bghm1tnlbozp- f.i;ctor when 120 V AC at a frequency of 20 kHz is applied to (npmbtl -g;f.. bn 8 horizo1.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, 6 rto9+n;x g,pjty5nq,0.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kwf,:s qjqsyn5qo2j qe( *y 1y;Hz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reah0/wm04dv7z7nxo a lg1rc 3 rnctance 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.y3xazy yof 8*kus2i5 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 capacitiv03ksghn p+szh ; ,+bm r/t+jpre reactance of a 0.010-mF capacitor be 100 W?pm n;z+h3r/jb+s t,g+0rp hsk

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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 capacitor t lvm i u,c9r3six:x7zm0p;4dat 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 vty e xy x3wy3jni+i )u2:x4l:resistance, 15.0 W induc+i ) tv4j:yxux2nxiey3lwy :3tive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH co, 3s nwkd;,iw.wq8zo vt74jck il, and 1.0-vd kwo, 4 zswk ;83.n7jqwc,itmF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W recie ,bb,rq/9 tsistor, 20-mH coil, and 1.0-mF capacitor a 9 b,cr,/beiqtre 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 coewbbr4/lp6bldv )2u ;:qf)ym nnected in series with a 20-mH inductor, what is the i emy6l wuvp)4 fldb:qb;r)b/2mpedance 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 inductorep-6iwdn8x* 1 6q 0x8kwwq tki, what is the ph*w6 pn exx8w tiq -dw0kqki861ase 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 nmb9 pw7 t,;5t:ozokqz eeded in a series circuit with a 20-mH coil and 1.0-mF capacitoro9zk7,5: ; qmt pztwob for a total impedance 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 100-W resistor ai4 : w pp ew1(ydppe9whq4nf;2nd 15-mH coil to get a total impeydp:f 2p; 4w9hw 1eppwein(4qdance 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 b.vy7ip e xpwz1y),31mi(bgstotal impedance of 40000 Wi pew1 .1y3ms ),bxbg(p 7iyzv?

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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 series9laixhue.z. - with a 100-kW resistor at 1.0-MHz for a total impedance .i a9.-lzhuxe 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. What mnjcc ,+a(p)y3y:ed zaux8/ z is the impedydy aj/n,ep3zx:8uc()c+a m zance 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 y :s: l*h.y2fs/xvakqoz ca/5 with a 10-mF capacitor at 1.0 kHz for a total imf:/.s oxvqalsa2/ yzy5h:c*kpedance 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 1kg yk;9o9ij+akd (6sf0kom.d.0 kHz for a phase angle oj9modg.ky6i (d0f ;kk9ok+ saf $40^{\circ}$?

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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 s(bb+v48 qttb et8oz( at 1.0 kHz for a total impedance of bv4b (zo( beq8t8t+s t45 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 i f+ p nv7whq.4rx--njsfhfb35 n series with a 100-mF capacitor at 120 Hz. What is the phabn xv7-rf-53sqn pjhh + w.f4fse 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 sb4:r g vrbx qz,dti hh038b.afvf); 3100-W resistor, 20-mH coil, and 1.0f) z.rbq3xv08a: f;bhiv34 gr,hbs t d-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor,y1,3ea0iem 4 a s8pxsq and a 0.350-H inductor. The circ qy,e sai4xme10 sa38puit 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 3z b x/yr (jxbx-4xka3qe vq*97k1kmj 70 W, and an inductor of inductive reactance 30 W are connected in series to a 11 a-bjr1zxvqy347jb (kxmx/7 k9qekx *0-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 (m-0cboas3m scontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hzsm(s- cm03abo 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 serieg.ne .ha3xpr y5ttg,. s with a 500-W resistor for a phase angle of g,at. .t3gx.y5r nhpe$40^{\circ}$ 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 = 20t /t0c wz4j+bi0-mH, C = 10.0 mF. At what frequency should the cwt/04 tzbcji+ircuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit wij0z be.exe9z4uk q3t7th 12.0 W resistance, 15.0 W inductive reactanu9.k e zejt 3e047xbqzce, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cixpv j6zk0/ja2sv vlnz0 ):vz 6rcuit 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 Wngnvs00dr x/;a+d: dtcom(a + and a resistance of 30 W. What is the power fat+g a ;xro:dd d0(m0nn /scv+actor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, 0j xd s2*jjz fc/vsk4+a 10-mF capacitor, and a 0.45-H inductor, when connect/j*4ksx2jf dc j+vsz0 ed 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 vzm ng-7o):bu a 1.0-mF capacitor and a 15-mH coil in series?omgnv7 -buz:)

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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 capac:*mewp k22vu1bt)1qk wrw: (yxzf3y eitor for a resonant freque: 2b ykqwuf1te) 2(p*1myk zrxv:3 wewncy 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 ymnwt6l 1x:x12-griz in series with a 3.7-mH inductor for a resonant frequency of 10 twm6g1 x ryz1l:x2in-00 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 g ci s;h,9w+u1(xmfsifuagr9l /ve 8 2be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency gslherui1 (/gx2 u 89;+ivwmafsc9,f of the circuit is to be 1000 Hz?

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