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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 are units s t07, g8+hv uqkcj+amof 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 thec w,g v2gz z/v(je6gv3 $emf$ 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 fhhq ,r-j* k:owire in a coil produces what kind of change on the induced hkrofq, h*j:- $emf$, 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 wiwj(b)t,dy y;s re produces what kind of change on the in(wy), y; stdjbduced $emf$, 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 produm c)bkih3/veg oyu)2 ,p+ qbz)ces what kind of change on the induced)z/m2,)yev3b +qbi kocpgu)h $emf$, 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 a0ry83 qpblsv 9 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 curre),cc lynizb+2f kysr62eb ( c(nt in a conductor will be that whicrenfik2(2c b b, 6y)sz(cyl+ch 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 azbgx ,i /r:om2 horizontal table. A bar magnet is held above its ,m:/bxg o riz2center with 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 fl4wiye 7hzt1. cat on a horizontal table. A bar magnet is held above its center with its north pole poiezc 14.7yhw tinting 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 magnetizrhm)1:- )fkx+gyk 6nww(-cr n+eaew c field vector points straight up. The magnetic f+ exkk+-ga 6rnfe my-(n 1w)hzrww:)c ield 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 table top in a region where the magnetic fielq:-o2kjpm f 7ss7l mvhw k:7n3d vector points straight up. The magnetic shw7mnpk2o77 q jsf3- lm :vk: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 peg40 ;edek/ka horizontal 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 current in this coil as the field disappeaekke/e p40g d;rs?

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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-ogp :x nek13c7/0icbl increasing current northward. Two coils of wire liecxcp:ekgo 31 7li0/b n 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 fios xy (6hx8*wtrst. As the north pole enters the wire, the induce 8h6t (wo*syxxd 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)h3wu f r)w5ms about an axis whose direction can be varied. In a region where a uniform magu)r 5wm)3wf hsnetic 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 speed about an axis ainzg, ()hz)dhnnf +5 whose direction can ,hna dn)znh )z(i g5f+be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the 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.) sm6ixi1*p ez
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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 thgazyq/-+7xusg -:m :qr 4bjctat 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 flx( gx z2yao+uetup :-1;f:p uield. 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 eastk d h:ch9gcn*xfh;vxpg;m9-c* ib/ 0g-west direction) is moved northward at constant velocvngdi* b hf:gmxc9h c0h -gp ;/9*kcx;ity through a 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 rotisn6 x-2(mrws ates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transform qyhxi11.tsri:kf; u,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 revolunmx.7icm ax 7k g0x8q)tions each second. The frequency of the xn0 iqmxag. x7 8m7)ck$emf$ 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 towax;podde3a* e--p7 nu : qw ;;tzme,z

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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 s/dlyp/yu 4k x85l x4 qj*gop4that

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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/aqv6:mj:. bm ;ksfju the secondary coil contains more loops than the primary coijkm:qbma6 : . s/;jvufl 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 2 qv ;qbo1e.frcontains more loops than the secondary coil th. eo21vrqbqf;en 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, th n l;n do 2wja(1i6dlej(wy*h7e power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuia:k4r0m azt bn9md 9s ud 2w)*tkn,6iqt,

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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 a5(,kight/ y tcre connected in series to an ideal battery of constant terminal voltage. At the momeh ti5/ ct(,kgynt 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 series to 6e9z(vf7sp 3k gf, anvan ideal battery of constant terminal voltage. At the moment contact is made with the battery, the(9nvpve zfs ,ak f36g7 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 connec: .7gqnklzn+s rd 8bt2ted 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 induc, xhgk.spxwlq 0 tw; 4n2gfq);tance 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 series to a batter(br1nqc-oi h25d p 2*a blh-sfy. The time constant for the circuit represents bs q 2a(5 *f2hrn1do-ilhcb-pthe time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in95 s0ls4ip1s h ao(d qlyk4glvz,x4x(m 9t1e s series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for0s(v 91gh9q5xsxsl(4 k 4zdais m ,p4eotyll1 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 unitqzim*3u3sf ,pk * m1oks 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 circuit, the cuvrstoq50mz 0d1( hft*rrent

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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 cir c6/j v-w2dhj+glnck:z . ntwvo;za+* cuit, the curren+ vj6l+ k-to/c wdnhg*cnaw; z:j2vz.t

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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 chang+ j:h zeldnq(e56q 2saes by what factor when the frequency+ln26( j zqah5eqes:d 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 inductor is doubled, the induok 1so /h-iz.s yb ga81,nx*tgctive reactance of thatyb ,ntz8 h-/k1 1sxagg*.s ooi 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 vyz):qc7io:sqev jy;y 9yhb -:*rf o k49vm+e goltage across an inductor approaches zero, the inductive re):yb:k9mezye7fr4:ogh q ;y viyq9jco-s+ v*actance 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 AC power supply. In thisx:q. 0zpf9h3r,qg pe8b r.sw l circuit, the currebf l8ghp:qp9r..,0w rzsq3 xent

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance nfk, w(tp-yp6 in an ac circuit changes by what factor when the frequen,-yk( nwfptp 6cy 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 gn(0ughab i 8 -zytzm3f05bx 2a capacitor approaches zero, the capacitive reactance of that capacitzz f(xmg30n a20 g5bhui-bty8 or

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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 betwy2 n h,bv4nf)4 zil4veeen the voltages of the inductor and capacitor in a RLC series circ n2 yznb4vh4 fe4,li)vuit?

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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 define0goi(d k7b-w zd as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increa5uh 0p hu;: mq9p5tisrses. When is p;i hqp5s0u 9mu:t h5rthis statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuj x/z6xs.)k ue1c0 1rezpca6p it 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 series0p bbzq57w n 2netu 0vtq.6am00sb,xv circuit. The impedance of 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 p3n,ruil8h a+-jn q;z an LRC series circuit, the resonant frequency of that cirp3 hj qzn a,8nrui+;l-cuit 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 drc9(r7n i;te 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 circuiv6ecy3 pe m:bpa8:.8 ocgsj2s t 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 rotath*y 9*yzhzaljycy*4 up8x -z3ing in a uniform magnetic field of 0.20 T. y3y -xypyza4h *zljc* 8h9*zuFind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fie rvs*o3:qqef p3mat ezv-n k62(b;q+eld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and th3ek *e23;rt+mv-o b6qpva ( q :qnfesze 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 radius 0.10 m is rotating in a uniform magnetic field of 0.2i, z*glzh g*c qhp8c7q95mdj20 T. Find the magneti7ih*qg z qz8,c5hgp *l 2md9jcc flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of ap-g1a0 26jpwp.lels k6p o0.yq9cxodn 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 fromqzh4)y (qff u, $4.0 \times 10^{-5} \; Wb$ 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 fra6msye,0b y ot6me 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, fin , 60ytbmose6yd 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 area oh3amp qfux 22 vcu r7h4vu0j5/f $0.40 \; m^{2}$ 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 arefpz*a: - gaym 9q6yul0a $0.20 \; m^{2}$ 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 spa6.wdw 6;ra6kw1szrk p n of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field wwrk6.ksp ;1zdarw66is $6.0 \times 10^{-5} \; T$. 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 lonp i 2vmyk;9hxu1 c9p5pg rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of 9;c xpp2yi1 mp95hvkuits 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 h 9 e4,d uyf01mosgwdt -4eli-has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of dp6 r vd5fjx-;ozn2m4wire 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 lo,2e18z t rhq w.g5hqknops 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.h qket81g nw q,rh25z. 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 t,hyn. )g fi.hq6ys7qiurns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an9r q* y)*utodn output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of tnd* qt)uyo*9r he 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 g1mfp 8rc.5-0 5,grjlxxj ;zby coo: gyenerator with 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 operates gc0)tm6/ lzq*7cuda w 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 .1.odx)q dn). zn3osybv,c uzyd0qv1resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generatedzyzqu vo3 n)ob1vxyc,1dd .. .0 q)sns 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 connecteq0a.cf , usvv0d to a 24-V power supply. The operating currensvqvf.c ,0a 0ut 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-Vh5+lh6-ua mtk power supply. Thet-a5m 6hhlu +k operating 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 supply. 6+0qsi cn zf8lThe opfc8lzni6 q+s0 erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to:k fqnv 7:tsb),ibbt6 reduce 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 primc s, tm)zz4:bn7yx/fvary of a transformer causes 14 A to flow in the secondary. How many turns aren /7y:vsmfzz4 xtb),c 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 m)gm7oh9bd (bo hyy-n )any turns are necessary in a 110-V primary if the 24-V secondary hy7d)nmyhb -)ob(o9g has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary co/ nt no1b8snn cp9osj27o ,-wfil and a 2000-turn secondary coil. If thow1onn/j9so-f ,p2stbc 8 n7ne current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformz e1;ja ea x0f8,r 4ybpxs+y,fer. Assuming 100% efficiency, how manp+f be 0jr8,f4s ye1zx;xa y,ay 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 transform9)q -rfeqj 9poer provides 7500 V at 10.0 mA. The primary co-9qjp 9)refqoil 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 .mg2wd4a s.bk,q rz15;aig rtsecondary coil. If 120 V at 2.0 A is applied to the pbgaigtsmqr a.1;5r w24 ,k zd.rimary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and v+ *ozvh7-vds300 turns on its secondary coil. If 120 V at 2.0 A is applied to thed7o*zsv v+-hv primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer h r0.hl51jqjfdrjvz g)0 xctln bz8:)-as 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the))- bdjjr0 zh10cf g n5v8q.lj:txz lr 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 1s 2vgy:tgun n2-t/ e+o00 turns and its secondary has 200 turns. If th2n/ustt+g:gon e- 2v ye input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20 r /i6bhi1yu(r0 turns. If the power input to the primary is 100 W, we can expect tih1/y(i u r6rbhe 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 lxgb3g2pv x 4 7 tkz3bfswg.3h,m.i.cof current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lvwxh4c,bk7ps .g3x 2 imfb ggz.3.3ltine of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stu s5uvm7m b--yepped up to 4500 V by a transformer and ty ub vu-sm57m-ransmitted 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. Thy,pl,d 3bzy b+e voltage is usually stepped up to 4500 V by a transformer and transmitted throughy,,lzb+db3 p y 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 resistance of 0.ch *+urs-o iqyw.kj4b te:i. :60 W. A generator produces 100 V at 70 A. In order to rbh-.:cui riste4*w+o j.:q ykeduce 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 linei4gfgr jf o.q1k );i,f 50 km long has a total resistance of 0.60 W. A generator p1gfif;i) g k,r4o .fjqroduces 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 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. Ho// a.2totp dll+ov2fk6x(p jmw much less power would be lost if the power w6v mooj +/fap/(p.t2 dx2 ltklere 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 2ylq g:vm0a; +w0 A. It is to be transmitted on a line with resistance of 0.600+m;a qlvgw:y 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+u;7wp+ hw8puzm1kr *v +puyjuj 5+mz a current of 5.0 A. How much energy is stored in the coil's magnem +uh+7;*y pv+zuupj1jr5ukz+wp 8mwtic 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 inductor. :inwsu p:7p)s What is this circuit's timep:7 n ispuw):s 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 anz4z+hi y.wht - AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currenp m40mw)4jkq4 ywg p/et?

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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 indgc pwzxh;+ 0l b6/x9nto a 120-V AC outlet. What is the resistance of the lac hxwdzn 9;lx+bg60/p mp?

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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 connec9 6yj o;h5gsmvted to a 120-V ac power supply. What is the peak currentv 9o j;6m5ysgh through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supetz/6i6q/d ohbv4h xfy/1)r gj(-dlnply. What is the power disslx/dhvf( je- o/qzt )ri n416g b6/hydipated 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 resistwa2n * 3cec3kuor 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 resistv 4smy;w ,mz3b3)kkscor 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 yvp)nkr1 ,*kxtv6; dcresistor 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 ofljd+ f 0qn e .cotbl* rg19*w+yqxs)t; a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.5mdbtqz-2 +1n5 brvf 9k0-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 ac-rfv5h :no oaw9g4b 1lyj+( b 14.0-mH 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 nlvz25nly* )ql cfn f+0ecessary 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 ; ku8 .iq0mxtz 98/vpfpl e jdl.qm*.ois applied to it?v9xz*i medpq .pm08lt ;.uk/.fo jlq8

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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 coibmefrg (17p4mzt h;i *l due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitiv w4rb0t5u/s dje reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 y bujo8 zt69s)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 reactath;-5dnm6n(wv twh;5n*sjs a2i wm 4 xnce 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 rkc/f3vsj/1mx o ui/8uh q8 t)weactance of a 0.010-mF capacitor be 100 W?xjc w/iu o /s3mtuh/vq1fk8)8

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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 at 1000 Hz and 5.0 V?h:an .dnzdkj/6p.oti.n 3gc +

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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 circuik :aabi xa7/) :a e,)rwjkqkz-t with 12.0 W resistance, 15.0 W inductive reaerj:wia /))7kzaa q x:, abkk-ctance, 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-mibgmf2.g3eh .mrb8 (tofk0( zH coil, and 1.0-mF capacitor are conn8gm3eb mr0tk2ohgf.b if(z .(ected 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 bzz hv/57m8ywwo4 .f 1ltye:j 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri8j hebw: v zy7om/5fwtz1yl.4es?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH induct cfgrm: 2ojqh54 2xb+6mrvkae d-rzp 69em59qor, what is the impedance at2 45x 6d e29qmkf+m6q:a-hpc 9o rrb5ezgrjv m 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 connecte( 8ze ib k(o*2razji+pd in series with a 20-mH inductor, what is the phb((o ajzi pz+*e2ikr8ase 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 needek1(*ajk.u+uq 6z2dc 3ez mgqsd in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W ajed6zg.q 21q+u(ua szc k3k*mt 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 capaca+wu - q5q(oikitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W a-q+quw k5i(ao t 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 to1090awds txoq tal impedance odo9 wtsx0a10q f 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 109 t)95f: q7 yw z*kymqccj;jtj0-kW resistor at 1.0-MHz for a total impedanqj mktw fjy:)75qjyc9 ;ct9*zce 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 is the8rs)i1o )nmc 4gpdkll7v,xpiw 1) q0;tyg/y z impedan) / iny)dk08 4vpt,wqly1l;x s)1pg c7zmogirce 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 neede q 2 6ti9 ad:17q(hn 2k(uihfvj9kkmmmx:t.mqd in series with a 10-mF capacitor at 1.0 kHz for a total im 69kx vjq9nami 2m12 .q(:tu mikkt:mdf(h7qhpedance 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 wi; iz g49f1t 7 hc7)wohoe0n dzs-cw)sdth a 10-mF capacitor at 1.0 kHz for a phass7zi14;) swn hohf97dd cw gc-ez0t)oe angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at p5u8h:he0qmeu7 r)m*, jitnv 1.0 kHz for a total impedance of 45 W)7qn uhe,itj5u 0 :veh p8mrm*?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the pha3e j (b3agfwvu4wo4 ,i;n bt5yse anglegb;4ioneyf(w433 w 5 uj bav,t?

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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 mz)t : 5jkp7mrresistor, 20-mH coil, and 1.0-mF capacitor are connected in series rk:mzt5j7)p m?

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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-Wm tq:4p2:ohm fy)6epj resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connect6:ph :o jfqm p4ty2me)ed 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 ca iydkt1t(0 8jnpacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What 8ni t(dk0 yt1jcurrent 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 forjn401 z;: bihzkx6(c4xidk qo a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, xkz0 n4hkbdx jc;ioq1:i z( 64and 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 fopkw5ry:j/ k co l(v7*jr a phase angle of pwjl7jo5k cv y/r*:(k$40^{\circ}$ 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 fju/ qrb(h*r9grequency should the circuit be driven in order to have maximum power transferred from the drivinbq gjr/ru h(*9g 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 in0xpf2dzqu,d7)dy d3 6uad/ jq an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W xpyj6d daz)qufqd/2d03ud ,7 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 circuium 0x ngqgd3 ux5g23(vt is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 303; ch o02k h0,dee bdst8qg.to4,dkx u W. What is the ,3q.d ht80,co4uokbeh 2;g ddtxks 0e power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor fo ;a(qb2m 8f,cgxe,u6.le vzumr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, ac28mv,(gxb;ue.zq, e 6 f malund a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequvw.ca/0v*vt wh/rks j4ve j6 ,ency of a 1.0-mF capacitor and a 15-mH coil in series?saj0vev//jw w 4h kvvr*.c6t,

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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 nadge9,j/n .pimv) svx +)bi; a 4.7-mF capacitor for a resonant frequency oj+pd; ) xv bvminia/sn9g, )e.f 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 inductor for a resonandpjfpbo;u 8, i79wi o7t frequency o ,fu;7 op978wpoij idbf 1000 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 ztr-z 8o0 hfa6be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be z86zht0 -foar 1000 Hz?

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