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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 jkolz.h. 2up;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 tqq:tx,lg9im z :e 55 knf7/cjdamd/m2hat 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 whalypb+ :8hz4mqt kind of change on the inducedb+ :4yl8 zmhqp $emf$, 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 throug .z3bu0jutx :ch a loop of wire produces what kind of change on the inbzu xc0.u: tj3duced $emf$, 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 chane;u(v 6cojot;0j*,ju p royp0 ge on the induyp;(uoj j *j,pe06 toro0c ;uvced $emf$, 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 b xwmxxjr+.i-2 )v wqrnbn; 98a 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 m9l59 7koms aca conductor will be that which tends to produce which of the foll7aokc sml95 9mowing 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 rc 2fk.5th6ty on a horizontal table. A bar magnet is held above its center with i52y thfr6c.tk ts 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 a horizontal table. +wfzahrk3hd(tqw+q, tyz55 wo ,,y c;4u e3g s A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (wd k,5qtzrzc 4;gyh3w+h qeof,3w5t+ a,ys u(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 t, g.i1ypq 7ampop in a region where the magnetic field vector points straight up. The magnetic field vanishes sudaq .g,1 7yppmidenly. 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 table top in a region where the magnetic field vectzsw:zcp,6 1xwmc 1qaxjwgp( j(37mso v,.nw 9 or points straight up. The magnetmo :7cw,3zmjsws9wa6 pqwj .ngpcxv(x1z (1,ic 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 tabc/cb/ e8ucg3i3v6p2b5i yl ible top in a region where the magnetic field points straight down. The magnetic field disa gcibil v8/3c /i5e3bubyc2 6pppears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-z:)sddsacv mt btlln0gg8 r.-o/6 *2rincreasing current .zt-/2n0rd*tm)lcvlgs:g8dbr os6a northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering fd7io+ w0xny 6 tvtdf45n d4(wdirst. As the td vnwwo70fd 6n5 ( y4ddixt4+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 who1-g gnalq-y2)2 e0axj dblgsy)h2n( yse direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oriy ygd aqg-)xsy2-) 2l 10l j2nh(gaebnentation 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 speed about an axis whoyoq5diof u*gr th51;) se direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of u 1 iygtfh5)o q;o*d5rthe 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.) f4y( o6c+5nfhq cghrxhy;*w
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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 thw cu- xd,2iid+d fy(z 8hw7,c, qkoo;yat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fieldqso6 xbjto60a / ,cp:o. 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-wdsnk 9.fy ujk)e4;fi/est direction) is moved northward at constant velocity through a magnetic fiel u sf;fk)d./ nkejiy94d 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 consu0r vk,. fzf,xtant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatoa3riy uk li((0 x25adga /y:ktr transforms

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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 rejv2s5il8q4 nb 43;gjbar;jopvolutions each second. The frequency of the4;qj ;5 gj lbnb8v4oji3s2par $emf$ 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 devicj2vk)se l5 jx2e 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 thatis0mcu(zt)yxt )u v o4 y0o (*2ijknl7

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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 t)+s s:34m jv/s5 f2uqp )hbc1xwuhbfshe secondary coil contains more loops than the primary coil then it ipb4cusf+ w15 :h) /shu )3xjm bfv2ssqs 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 coil7hf n ss(vy( ke-fiz4/ contains more loops than the secondary coil then it is is-vh4yf 7sfz(ke/n( 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 pow1 ni 1-ugzkjoqe*p 9/zb boj+9er input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resona(y9 sq; 7aqtdnnt circuit,

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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 sern zi;s,eq)+ twies to an ideal battery of constant terminal vol+s iqe;wn t),ztage. 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 connected in serp4f5b,yi.,t(m to aco3s5 0* hx,raxkxocpm5ies to an ideal battery of constant terminal voltage. At the mom* 0cxmt o4.i t3,c,p khy5aafsbr o5x(xpom5 ,ent 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 resis-ak3 nzu dxaq*vigvo,(thh1o((( mw: tance 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 inductanc +//wg+i uh; *m*aej pyjm-evze 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 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 ser h0davdos*/9o.df jm(ies to a battery. The time constant for the circuit represents the time required for the cum/d (djo*vo a0s.fd9 hrrent 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 sitt h:y1c071ab6ll + or 6vru, c)rzjconnected in series to a battery. The battery is s6)t arlurtcb 7,10:zy6 hj ri1osc+lvuddenly 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 h.f4ponknq76n h1mhny 1 c12x r r1q/auave the same units 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 cl hoi4.kk3:eq5qibfmy1-k+w3t l9 p 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 conne ,poees h;-s2tn x*;ptcted to an AC power supply. In this circuit, the current;h2sse t*x- p eop;,nt

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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 l+.0e5 tmif -11weaixe e:soyog)ry(circuit changes by what factor when the frequency is triple+ ei.w(lr1yegmoyxa s 5te 1ie:)0of-d?

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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 doubled, thee*w79;w gngx(j3sli+ 4arzesu3 px7o inductive reactancgg3jo7sxa3i (pzww r7+e4ln *xu;es 9e of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC vv zyr m,:1fg+ooltage across an inductor approaches zero, the inductive:,vgfr zm +o1y 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 connected to an ACnzbq5v8*/zzu +1tuea8v zga0 power supply. In this circuit, the currentu50tzn1 v/ez8zuz+bg aq *a8v

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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 f-tt 8h9xh5t) eo .cvreactor when the frequeh.) tthr-c 9vt8e eox5ncy 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 voltagfb5, 0 ;fohcb i.lxq;qe across a capacitor approaches zero, the capacitive reactance of o l.hb;bqff,xq; 0i5cthat 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 vol pl6yo-9,a oc*pvu5g3a fgm;qtages of the inductor and capacitor in a RLC series cir5qyu96p , f*-agmog pl 3;aocvcuit?

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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 cir5t8w b.hqc*ai zmx./( kb g:pik l(3uscuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The i rmo+o+h-sr: 3cw o6lfcipnwor. 43x*mpedance of the circuit increases if R increases. When is this st*+4o: + wmx 3rcp cinfo36hwrloor-s.atement 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 impedance of r(ct.g v09dpfl )h(v-c9yje xthe 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 ofk/ i zygqn*gkcpt09;mk(/s ez se *z7) the 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 in an L b*t3)whgn- clRC series circuit, the resonant frequency of that c g-*bwl )thnc3ircuit 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 resonane-mexx/2sedq43lb(oja53 bo l7 yt0 yce,

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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 on, 2ech 9ejq,/rv i.mcircuit 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 inl8oj); 7l; e:mo co zr5k /jxsbh)0tjb 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 at75 ;kls jz o8jmb)rh0jbolex):c/ o; re 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 0.1ee o5ka00)n fo0 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 veane5oe) k00 foctor 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 radi:p n;j8d ra5dn(r sdd7us 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 magnetpd;7rads ( 8 5:ddnnrjic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reducm p3uu g+z3o9ged 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 chana(acne2h.o l m) ,4nbiw 3z:kyges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 1.kijv3e+ h3dz 8 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field.e 3z+ji3hv dk 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 and an x/ )4xqx12mcxuiw/ fd+yn qwj lhb0(4 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 areahw 0ye,n2us d e5.2s dvl+qlo3t3di6 b $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a loclg3zdgkf1c7r )7n6- m:ogi qnation where the downward component of the Earth's magnetic fiel:3-n7kq gmlrogzf 1)dci76gn d 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 rewawiuu) b5txd 1 , 0rmoq9.fzn:48inotates at a constant angular velocity of 2.0 rad/s about a vertical axis th1uwxbnizq,59fu:08 n ior em.w at)d4 rough 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 has 50 loops and a cross-sectiona1c: *l6rrjd5r1b antzo f e67gl area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area h+pxx9 +0falag7 ik) q$0.090 \; m^{2}$ 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 rectangul6msbn 2 yba/uq9f-h2 yar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a unifya 22h6 sm nuf/9qybb-orm 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 wr)-y6eh;bglgwmr- o :y w)fvu;c1g/ wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simplnn.qtk c .r2z.e 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 are. qzn. 2krtn.ca of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a max 9-uuih/q a*xeimum $emf$ 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 havemk5g;c7wm hdpz rb4qb wv/ 7u+e4s+*q a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on.tnesey 8/ q/jhaljo),ac- ;v 120 V AC, and when running at full speed it l,8qvc/e .-heoa tjanjy/s;) 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;.tjyl; w:s ypi.e3cn to a 24-V power supply. The operating current is 1.0 A. What is the start-up c;li3 y;.stjenwy.:p 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 co ),ljr,bortr:c h0kax5 8(5bl k.v ocfnnected to a 24-V power supply. The opevl(5crh.rkbj8 ,ortb 5l: )oxa fk0c,rating current is 1.0 A at full 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 resistance 6.0 W is connected to a 24-V power se 6sy:o2 mp6ng aj/g(/ iesgh)upply. The operating current is 1.0 A at full speed. What iyg(o )jha gs/s2 /iee6gm:p n6s 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 redu7*wv6duzf4tbn bm,)kfzc /c ro rc- ,)ce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seb rbnx0d+l6xa8) ik o-condaryo n0 dxl8xak)-6irb +b. How 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, howtz1:do 0vuh. h many turns are necessary in a 110-V primary if the 24-V secondary hoz.vhtd u:10has 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 prima--pcxe 8qnjowo+9 ih, ry coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wh -cqx9eo-, jionwp+h 8at is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efig6rpje37 xyhrj0(,bficiency, how many amps at 24 rjr(xj e bg3 i7h6y,0pV 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 ozykf7rbh zu ;kq +9941)aiyt +j7uc xrf a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates ou+uf;y1q x rtyzc7rk 7994+) jbzkh ian 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 6dwduw.u0 +jc- k,t7 6id ;vvsb 4i;xly0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vos 7;4 ylk60+udx; ti-cvv,w.wbui jd dltage 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 and 300 sd hkp-0,dot+,l) ezj turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current d,okh,)dl 0-jst pez+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 200 turns. I.e iv hg0dj08if the input current agev0i jdi0h.8 t 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 1w9ndp c*1afy100 turns and its secondary has 200 turns. If the input voltag 1ayc*f19p dnwe 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 has 200 v5y6o n br+0kmturns. If the powerrvk no05+m 6by input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped uo pg xlu* )1r. qr65qaup k+,o6ggbzy9p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number ak6,+p95uzxqyrqrg o.lgo p6)g *1bu of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is u +v(7sew n/))gmfyo s, jac2wlsually stepped up to 4500 V by a transformer and transmity la se)n2g)cfsj( +7w/ ,wvmoted 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 curren(3aj( wcr var8faegawt( ;6dh7 e2. uct 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 percentage power lost in the tran3 cv dwuw(8(7artr2e a ;je(cga6af.h smission 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 50vxbh/i1ca5ay/;a9 nbbil ;9 +o s h7sc 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 s9h+ay i;c/5i n ;xc9haol/s1bb7 bvawere 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. A gene)o b+k5 ri2 mo 7t0+ kb p:opnvggjke-73x4bxerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmiro-tb j0 k p)v+o5x:x 347egnmgpki+b7o k2e bssion 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.c ytvfy,zpm,64 h/+bz How much less power would be lost if the power were transmitted at 3000 V insteay+ t,6bfm pc4,zv/yhzd 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 txo.cou4 5ty vmbwnt p-rl*7/0ransmitted on a line with resistance of 0.60 W. To -4u. o5o tbmtr7lcyv/w*npx0 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 o+qa 3dn cab2;af 5.0 A. How much energy is stored in the coil's magnetic ca2 b3d+;anaq 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 cfd34gpny k5 8l.,th6jzl hx*nontains a 6.0-W resistor and an 18-H inductor. What is this circuit's t86x 3ly,n.tf4dknhlzh * gj 5pime 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 t(b /uxmsy6 aahf.7wsm+ * s-mfmk(1lyhe 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 ou(nbhn9-5; oy :;*eilc lb3syoy e8jsztlet. 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 lh ing8q0 pz56pqz,s)+s6ftx w ampwz,tz+q s)hpi8 6 p g05sf6nxq?

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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 connw/u emac6ix* (ected to a 120-V ac power supply. What is the peak current through the*a eux(/6mwic 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 cqx-g,mc al 4nlmovinx1531d9cx(s06/ af cy gonnected to a 120-V ac power supply. What is the power dissipated in t yim1c5oxc4 /d-xxal30c(ln am q1,gg vs69 fnhe 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 ak m4u/16nfs vb 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W r2 (/vhx bd0t2ad9ir usesistor 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 resishalsf +r k:7 9.lt8udt 59ouector 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 induu o-4,8b(0 rmirbse-l6gtci 4341i k yrp dghector 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 2tm 4k.mt ge5cof 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- k 5pn t ow9;lg:2r)ecj;wa5mkmH 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 157 W of inductive reactance agbrx64w 3 fwe*t 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 v *-a wo8xz/xw/n)t 9 dp:h;c-rilmas is applie-np-drcwv/mx:/ st9*ihx a ;aw8 )zold 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, 60.0s ovk*okto:8a d1*wg7 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 srun-a ,c-p-a szf h++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 8e)pwnktg/sdw d( w5 1+k dl(lis 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 zf+(f,gs(x lis)l*ia z3w+qdotql38 capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capaci(q2i b 3bdsbgmw;*w(ator be 100 W*sw3mwi((;b ba 2d bgq?

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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 tg8cako+ez )/w):xu vc hrough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedancemd76cv1)lt fvvf)ro2)bmi -i,jb5p h jhwq5 ) of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and v1 m)hwj5vdbhi ml cfiq7j),v)f) -rop tb2 6510.0 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 coil, and 1.06zhb y: 9/ty1h7+xv(lnszpul6)mmb s-mF capacitor are connected in ser/zml6pn: 9h1 )7u( btxvbym6slh yz+sies?

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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, 20-mH coil, and 1r :qj(p7bja l(.0-mF capacitor are connqrl bj(j7ap( :ected 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 200g rten2rf4 ub dp0o33-mH inductor, what is the impedance at 1000 30nf3p r o0 rgbeu4t2dHz?

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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 withj 4 h :0 7rycnmui-gw.gmhv/1t a 20-mH inductor, what is the pgwi n7:g0mc/ trh4uj1-.vyhm hase 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 6g f: /z6f n poh2gar5l+)tadva 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W rzdfpal:v6ht o5n2ag)+ /f g6 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 l; ndt(ps (e1y o+tvw1t-5 vwmand 15-mH coil to get a total impedance of nt1(s o (pytvlmwd;+vt1-ew5 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 inducfb83*l;jn tkp tor at 5000 Hz for a total impedance of 40000 W?fnbjl k38t;p *

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must c s5v xpv7m3w-e1qj+ rbe put in series with a 100-kW resistor at 1.0-MHz for a total impex1+v-qpm57 crejvs3wdance 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-kwy8 edqrdnc5 d *v3i+gl 80:cmF capacitor. What is the impedance *kcdyiqc deg:3 5vdr +08wl8nat 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capa9e z)l g lls,m)ro3grwf yz9n).)kll*citor at 1.0 kHz for a total impedance of 4. z*elofgrw3ngl,y)lk)zrl 9 lm s))95 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 kHpga09bt-m. a oz for a phase angla.g0batm- op9e 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 resistoa9sty4**huh0*nnqjsx mn 6y1 r at 1.0 kHz for a total impedance of 45 1qs hjn4max**tn 6us9 hy 0y*nW?

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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 lw;m b:38mwux at 120 Hz. What is the phas: umw3lx mb;w8e 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 amd73u qeg79ef+40-w q9:ppddespted t 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri:-p7ef4ee dp0md e+7dq3g qt9d9psu w es?

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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 c+a,.ja;est6a udcmb4 onsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350u; 4 ,bedsa6jaam. +tc-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductorr0zxb( 2p 2b po(zj*nv of inductive reactance 30 W are connected in series to a 110-V, 60-Hz poweroxpz ( (j 0bzvnr22*pb 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 )ko6ddc arl*8we+5xl a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wd) 6w*eadkl c+lxo r58hen 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 phased;ttvkq33s -p ;o4d dz1cr jb8 angle o;s;jo d33d1dvrk -zt8p4cqt bf $40^{\circ}$ 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 mbg o/ 2tngedz;q0x6msh;)mbx y07qy6 F. At what frequency should the circuit be driven in order to have maximum power transfqo7 zb hxn eq6sxt/g60;2 )dmbgy;0ym erred 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 iqon.)yl/nt 7)z -wwptw7f3l rn an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wz.ltnpw7y 7fw)nw to-l /3) qrhen the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circ+tyroyx,v -; kuit 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 impedancocix7*n1,fwo + 6 xkcz8./t vag0yx dee of 60 W and a resistance of 30 W. What is the power,+t g01zwvidoe87fkc/x x6 .xncy a *o 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 circuit containing a 50-W resistol(:nakqt5b qqb :1g +vr, a 10-mF capacitor, and a 0.45-H inductog lt k(anb1 +bqvq:q5:r, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacw. bwcg8)-wl zitor and a 15-mH coil in series?). cwlgwwb -8z

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a re(aec9 (9 gxc2p0qin:r rzs3a vsonant frequency of 10 kHzn cqe93:cgi2( a0a vzrrsp9(x ?

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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 ip(1 f .ggrp0cknductor for a resonant frequency of 1000 Hz1kf.0 pgg(cr p?

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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 resisto-xz3mr qxf0hm3 c2a cigh6 4o+r and a 40-mH coil if the resonant frho3x2q3cx -4 z0arif g6+hcmm equency of the circuit is to be 1000 Hz?

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