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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 magneticv3e.pxrkr u:trnswc-o g 7, . ch3-q9o 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 statxad mz/9/n-l d /+mquxes that 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 kind of change onk5i( def2k 7ol the inducekid7 ole(2 5kfd $emf$, 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 t7g v0gk2 .wjtaero6 dh+:bhe4hrough a loop of wire produces what dhkt r6e+e ov2a:4b.hgjgw70 kind 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 ofo*vx7u1q 6rig a loop of wire produces what kind of change on the induced6x irq7gvuo*1 $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnen6v.zs ugoz ( ;.hz+pgtic 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 indr7sba-;azx.g lv57l uw2pv6r uced current in a conductor will be that whir7p6avw 7gv-2r xb;l. z sau5lch tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tablekdw; ar :lycg.f7tt- +b3zx /c. A bar magnet is held above its center with its nortrc;:+t -xlg y.a/tdwbzc3f7 kh 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. A bar magnet isysg ct*r:b 1/t held above its center wryttc* 1b sg:/ith its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector i2r*gn m (ra5wt64oel points straight up. The magnetic field vanishes suddenly. Whenigat ol(e*r64m 25wr n 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 magneti6v,t qzrbvvm wkig2sf *eb 5:v5 ,:od:c field vector points straight up. The magnetic field suddenly grows stronger. When viewed frof2:dwz, kvv6t:g5qbmv: sb oev 5ri,* m above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the 0ni,t+01 lu 50lrgarnt -juq/dsvz..ne h*fc magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, wh .ilu*cztrh050,f+vjadn /r sn0 -l1tn uqe.gat 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 horizontjz3i 3shbnja/, cb t;- jw)pt7al table and carries an ever-increasing current northwar,s/ti-ajp ) wnjz7b;tjc3h3b d. 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 entj+k yrla,dp .68j9 lqfa+:w llering first. As the north pole enters the wire, the j,k q+apfllaydw9 l:l.jr+86 induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis w 0ed bqt,4ph:ghose direction can be varied. In a region where a uniform magnetic field points straight down, what mustebg,dh:pt 0q4 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 s:,jg+lva;h yconstant 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 axi vjy+glahs;,: s 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.wcy9k ugt+ d*e.2yps,
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an a2 uhh*q:d6sr0pyft8-d 1 mic$emf$ 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 magneti hr eb;a8kwe6ohy*0 n8c 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 mxzrxcmoqh1 b 7vi(m)p**0tnd1lir0l/4 y h,j oved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning th dqitx7m,4y)r(c lpi*vhmbl1r0 0hon jx/1 *ze 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 vgvvl 2-1zwas ) y;gnt**sw*coelocity $\omega$ 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 generatoj 8jhbnqam 1-...to zqr 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 revolutions each second. The frequency of g u .chck84qfl 5d61hsthlsuf16cdhkq g.5h4 8c e $emf$ 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 uselvyzwrr,n;j tb zu0 71;t 5xm0d 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 t)ge 38tlw4ozzhat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primxz+ zcg36mcrt-9we q :e44 bzfary coil then it ixtgfbr e: -q 9z3zcz4+64wcmes 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 -rc0k1gfm1u5+ 1upd orh 7gl7do,po wprimary coil contains more loops than the secondary coil then it is7o ld+ 01g womh5pcfr7 gpouk1ud1r,- 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 po q0+l35yzj l-sfgiim( wer 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 +rulkew5/o o/xm7 d+bcircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cons2n;j cxzq p8/mtant terminal voltage. At the moment contact is made with the battery, the voltage a j82/pmxcz; nqcross 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 induiq vgy9,hz4 1aunkctq: ;ainh nrx-140uh7/fctor are connected in series to an ideal battery of constant terminal voltage. fn, y:ux;huq10nk 14 igah4r/hniv9 a7ztqc- At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductat, 9fxv:wc+sz nce 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 a sm5lkl xjm-4f4,b)g 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 ifqd88ai tk 3 -ry de0y7)io3zqn series to a battery. The time constant for the circuit represents the time required for the currez8qyky3 3di0qd f-a t8)7oreint 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 induc6;uoefshys f7 ;*2 pcctor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant fo*s;e coc7 hfu2 y;p6sfr 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 e :wmftb;baj2e0 y 92-mzbtv +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 cir- covivz kwe)6/ j94gfcuit, 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 thfv:2687g7zgc/z(gu fqugi5z6q ,q *s x azngais circuit, the currentfq z8x/a*z76v2 uucgzz 6fq 5s:,nigaggq(g7

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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 circui5t 1rt:fcc, 1-y i6mwybgrujk+s)lp,t changes by what factor when the frequenc1y :5)j-wtcf rl, 1i rg,yukmb+ct6s py 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, ucfrt6k,(1qba0.h ,.js s me kthe inductive reactance of t (fm e1kq.,srcu.kjt60sha, bhat 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 approaches zero, the indu,s6f1ofebd. x,+v7p 7 a eporxctive reactance of that coixppa1v.x f6+ed,re,7 f obs 7ol

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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, the4 0lwmwju+:4 (rx0eqsz 67vf z:kszcq currentqqzcmvk04fx lwu06(js 7e: zs4rw z+:

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancej4. k)fzdxo1u+j pz6*00 p:ka kkcvjg in an ac circuit changes by what factor when the frequencyf6x.u:j0kk4k 0 zjv1oap +)z j gdkpc* 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 voltat.hdf u*,t wb-ge across a capacitor approaches zero, the capacitive r-w ht*b,duf.t eactance of 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 angl- z*u n5u+wzaie between the voltages of the inductor and capacitor in a RLC series circui5uzn+*i-a uwz t?

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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 a:p*qk5s(w lz 0kzw, /a)fjybvn RLC circuit 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 impedancey.nt tlm o40:4 bygi1j of the circuit increases if R increases. When is this statem0 ltbg4y1i4j yo tm:.nent 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 circuit1i,g cbiznz/( 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 circuit increases/ u ob( m1*nwfa-f( runiir)8k 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 capa48rme2bmm;u h citance both double in an LRC series circuit, the resonant frequency of that circuit 2b;ur meh84m mwill

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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. ve s/f7ro4d;h At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC ciq v7k-u2 jtg.u9-1tssl pcd)8+hsx wmrcuit 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 0.p61 d *l+9:chxklnui .kdi rf .p-ilc:20 T. Finnl.-pik d6chi+*kx1lrfd9: .u:pi lc d 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 uniform8fyhiy: /f .b3p pzue5 magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecy 5yu8f: .3p/fbzeiphtor 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 rotakn ;hz9vwzh (1i/ *.rteou.wgting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetivtg. e rkwhu.w;z1h *ni9oz/( c 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 of3.o+oeqw, rko 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 c8l-l0xxv pqe;oa:f5changes 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 18 cm. Achhlnyqdbl l1fgbn 90(-c49 7 uniffd7g y1hn-9n9qbb04l cl(lhc orm magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average 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 154:hecmjwjkaxq 5l /rh9kam ),:myi :, turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and .c7a - - evw-sy p3vm87def0x;ednfaz q4 ww.tarea $0.20 \; m^{2}$ 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 hori+/n irb;*6tav n xfra8:0;kc 3d zjuh2xc ufb5zontally at a location where the downward component of czubharvx /+6n ;3 tcrba82j;fkf: i0nu5x d*the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant -gl z7q0a5* bfx 7 *y57h, nublylaesbangular velocity of 2.0 rad/s about a vertical axis t ,nfs -*ah5b5q7gax0zylebu 7ly*bl 7hrough 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 lnrk*srpv ipc32zg/).m.ju 4woops 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 o/4gz* tn,.zjjrx+w vn i*1ogrmqtd+ ,f 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 rect 7gt.yj s2l9 m46npzodangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armatus9n ld 2jogp.47 tz6myre rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire7*p esckb q, 59q2bid0wrobr8;cd1d h 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 clpy(v+0waj rdhyrz war04gl0 4u/0 o/ onstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If0 0apldar+gjy( rwo h4/z0wy4 v 0lru/ 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 with a ma9esvzd;b/ c b.qc03 lgnb .ok:r 8e3egximum $emf$ 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 asen (50m0xx 0 hpyb):ktgvp9q2..de-p j muyz 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 open 3wfllc0qjp585n0h frates on 123wl8 cnqf05pf0nh j5l0 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 resistance 6.0 W is connected to a 24-V power supply. 1wak,feo,e *flk z8a5The operating current is 1.0 A. What is the start-ukfaaol1kz we *f ,5e8,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 resistahho l)5v.kkcc 7crz) x 1-(xbmnce 6.0 W is connected to a 24-V power supply. The operating currenxbkchz5v k-l)( m rx)oc1ch.7t 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 g65r- 2v2lm/7jg9zmo +bu3d ubbhr nnludm** a 24-V power supply. The operau hmgb m j* 7+dr9 g/3 b*m2v2oz-d5nulr6lnbuting 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 reduce a primary vx4g, vjwaam n;;,+ml eoltage 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 causepnv .qoa*w brq; a7(t6s 14 A to flow in the secondary. How many turns r(v qna* ta7wop6.q ;bare in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessaryt9qsw+w0 kgfwjacg( 66;it d8fn(1oi in a 110-V primary if the 24-V secon;wcsi+16j og fgat6dqi(ww0n k f9 (8tdary 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 0r +y ep5vfs2pgfo cl *dv*+x4primary coil and a 2000-turn secondary coil.*c+slfye f +pg*0do pvx24r5v If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming mi i. axx118d xs(d(wt100% efficiency, how many amps at 24 V can flo. i m1x(xa81iddx w(stw 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 provides 7500 V at 10.0 mA. wf 1g av0/2. ie)bvi8sgy3 v0/vsilnrThe primary coil operates on 120 V. What d i).f3ls0s i08naev/yvr1v/b wvgg2 ioes 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 prim1 -ozluc1adr)golp +(ary coil and 300 turns on its secondary coil. If 120 V at 2a) ro1-zugol+1 c(dlp.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary c-qc cq+ w3 pl6rdc*7ltoil and 300 turns on its secondary coil. If 120 V at 2.0 A is at-q*w76plq+c r 3dlccpplied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20(h 6e91 itbymcij2d+y0 turns. If the input current at the primary is 100 (jti e1+9mhy6 c i2dbyA, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tur2yul,p olzlt: w 6wg:-ns and its secondary has 200 turns. If the input voltage to the pr6 o2p,gw zwlll:: yu-timary 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 t*,5- witudqmq-wzga. t(4 prg urns and its secondary has 200 turns. If the power input to the primary is 100 W, we can ex .*ui-g wr(q pztdqmagt -4,5wpect 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. rhdqmb:4ztu1py ,1 4ns5ip 3 qThe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance z1,i4 q5ryps n1d3mqb 4hut :p1.0 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 60l 23u:*u fg0 d+cxqihw:ijl; a A of 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;h gl+x*:w ci0 ujui3a:dq l2f 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 a pgew/c.g6 /yws4 e rdci-h-e0t 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of t./g0iwrde ch--6esg/pe 4ywcotal 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 resistanl/.ijyx*+t b/lc rx a2ce of 0.60 W. A generator produces 100 V at.lilbxj cax/2 * /ry+t 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance ox uwx-)5idn 2ciydw36f 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 y3 6n wxxwc-5)idu2idwith 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 kwv,q;c eb7 .iabzu f;4(/yyd 6-W line at 1000 V. How much less power would be lostibdbz ;/(eac;7y,k y fu.wvq4 if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted o) nsfqa kx0gk;k/6 oh9n a line with resistance 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% ofhn9gx 6aqosf);kk0/k 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 mucs6--uc o*xt1i d:oli ph energy is stored in the coil's mag6d1ip os -l:io ctu*x-netic 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 6v+ :yk8dr 4cw fiqb85k.0-W resistor and an 18-H inductor. What is this circb fkik45:dc8 vyw8q+r uit'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 w:9v *xvdgu3nws93nt + j0wrqv here 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 current?fim c9m, /42a; uorn8ezu:k yv

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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 isjy w.avl9ne4g7)7zi p.g ; fob the resistance of the lamb7ne4igwgov z.9j)af .;pl7y p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cl0ppp,0ry a 5 + shmvfdt15pwby16nj:x7* lapurrent through the resistor?d7sl5yxp: my 0 pjbpal+h6, p15tfpanv* 1rw 0

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the p*+rcnk 9vk+hn,d+d5 bq uw/(s q8wluvower dissipated in the resiss r+ 85q+uvqun(,v b k9/d+wnclkwh *dtor?

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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-Wbikwya5(7 d*c 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 59 yb 8u3,iikul0-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 5ljh 70 / tkwb;grtpg:90-W resistor 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 induc,rmk8pw*8cmn tor 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 1gc tl;+ 4 .kw-5b.vk6oa zx*tgus-srz000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have+(z jobzqb9br (0hsqnp7gp 30 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.z 4k6d :nookw 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 fre 1sukuf5 9cn*x)+c3b grqom t.quency of 20 kHz is ) m.c*xrkqgf93+ 5 nuubo1cstapplied 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 .*q)7nx u0x mxkc.r,ki wph1na 2.50-mH coil 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 capacitive reactance of a 4.7-mF capacihg uv )dsl7) l4/4cewtf 4hy*gtor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive ref84oxv5 7y 2q +4kk cxl5x/aq9hfflqgactance 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 capacilf 5k z*g7u/r5qbzj 3rtor 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 reajlt z0od,pw7 )jebr ./ctance of a 0.010-mF capacitor be 100 W?zjjlo/ 7dp)r e .0w,tb

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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 througd 69dqf0ux0emm yd9 r)h 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 impedance of an ac series circuit with 12.0 W remgta;p k95 of,sistance, 15.0 W inductive reactance, and 10.0 W capacitiv5m 9,p;kotaf ge 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 cou6qwp v fzw2oth1ai8wq :.; 5ril, and 1.0-mF capacitor are connected in:1 w6vhi.w 5qw2 ; o8ztrpqauf 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 resistonrrf z3xg , (:dk7edr4u.ape(r, 20-mH coil, and 1.0-mF capacitor are dr,earf7: rux( p eng( 4zd.k3connected 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 if.gu (-f3p,zsjuji, ps connected in series with a 20-mH inductor, what is the imped .i-jj3zufpf(u , ps,gance 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 conne2h-qni4t*zw xcted in series with a 20-mH inductor, what is the phase angle at 1000 Hh 2w*xq-tizn 4z?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mFzjn6z85.i.//l v mqhae f a9cf capacitor ch86a./ezi v9al.f5jqm/ fzn 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-Ww2n+ hry (d6nfx: *qxk resistor and 15-mH coil to get a total impedance of 1 x*q(x nhn6:2rw dkf+y10 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 a)a9vtman pfh;pep:ouj,6 1r7 t 5000 Hz for a total imha1) vn 9rm,oj; p apptfe7u6:pedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in qzyhn/l c+7:c series with a 100-kW resistor at 1.0-MHz for a total impedaczqy7/nc:+l hnce 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. uunmkv+17k hf9t,y m0 What is the impedance at 1000 m yu0t9n h7k+1,fkmv uHz?

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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 a,b 0h)*ae jlq9atlt8 with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?ah0la*e8q9,lja ttb )

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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- bi,pdn /:sy)cmF capacitor at 1.0 kHz for a phase angle o,) yd/nbp:ci sf $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for e) 1; foajh8qtrdcsz 4.qi/n; a total impj4ec).rof hd1zq 8i;qn/a ;ts edance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF cal vwfze 5et0;9 dnf,dy3m8vos aeu6- (pacitor at 120 Hz. What is the phase angle93 -sva; de(ntefdwouyz0v el6 m,f 58?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, an+xny,lt oik)q, h ya dr2:y1c*d 1.0-mF capacitor are conny:2x dc)yk+q,* i ,la yorh1tnected 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 3j4v-nzt7*s6f xi ijol:raf/10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is t*iv: 6xz l- r4sntjfiafoj73/he 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 iz-fu r-fzdv 6-nductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What currenr6-f-fvz- zu dt 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 se2krd kjtz*i hr v8j+t3:(gy(tries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tr:trgthj8(2ity jz3(k +*k vdo 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 phl 6jjdoe1* ;fkokvw +(ase angle of kdw +k1voj l6 ej;(f*o$40^{\circ}$ 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-mHt)iqom /, tb,u,- epsowlq6z7, C = 10.0 mF. At what frequency should itbsoqel-,,/q6tz 7,wpm u)o the circuit 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 a o2r9 lcr/zuimfv.om-s9.4mguem.c (s s: ;mlc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pmsfi9l r m2ro eo(u :l.v.gms-c;zcs./4mmu9ower 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 cirjez vxf6 r6;9rcuit 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 30 Wj qk8, i61f hkq)c99yfikc(kg. What is the power f,98hgf jqk6 c)f9q(ic 1kykik 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, a55golve* r nd0 10-mF capacitor, and a 0.45-H induveo0l5g5d* rnctor, 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 capacm 70*suv att0fitor and a 15-mH coil in series?m0t v* a0st7uf

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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 ;uzr,h9 zocwi7 1x pi2wdw6o14.7-mF capacitor for a resonant frequency ozi,o1 h9 2cp ww z1uo7dir6x;wf 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: .mmmnp/6/fk)2xmi1 rt ebl5 qk;grt in series with a 3.7-mH inductor for a resonant freque)r.kngti:m6mpt e f/rqm mk/l;x152bncy of 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 be place,fc/qywp 7,bv d in series with a 30-W resistor and a 40-mH coil if the resona7,wcfpbv qy ,/nt frequency of the circuit is to be 1000 Hz?

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