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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 flux exce p i-04u4f/i9gc oymitghre10 c5us3ppt

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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 1 pw6pbq2,i omthe $emf$ 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 ps)*3r qvrc:.m7s puwzofqq 30roduces what kind of change on the i*s3rrvqo)pu. 7:cmz0 3qwqf s nduced $emf$, 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 fie;nx41qxow a(ou4yc-vs -br a/ld through a loop of wire produces what kind of change on4syw;xacoo a /r bv-n1xu(-4q the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on t3 ;1a*1fp;)aagow ruf3ikpl phe inducedp 11 k;opwpia3;)*falfar3gu $emf$, 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 from6cu96w0 0(mc oq.6zsnii b xkm a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current fkw2+.ze y7eu4f)b wiin a conductor will be that which tends to produce which of the following efuef w72k b4zy.ie)w+ffects?

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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 hctj3c k-xh1s0orizontal table. A bar magnet is held above its center with its north pole pointing down. Th3jch0 tkcx1 -se 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+m8j:bv kn/ q9v ce-cc magnet is held above its center e/qkc 8jv:c9+-bnm cvwith 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 akgu4y -e cw09b table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in th4wek0yu-cg9 b is 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 tai) +4vd ugbf m4dwfc;9ble top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increase+fiv9wd44du) f; b mgcs?

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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 aevbi ll+s/crd9)(s zgab.*dr 4ti34magnetic field points straight down. The magnetic field disappea li. brlz at*d44r+bdev/)sag 9cs 3(irs 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 horizonta+sn/z6vj*a d el table and carries an ever-increasing current northward. Two coils of wire lie flatd+en z6asv*/j 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 qf a1 i2me*cpwgh1/0d of wire with the north pole entering first. As the north pole enters1 gmpif*2aq /0wced h1 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 ayrbega . 6 (0(wdf;pept constant angular speed about an axis whose direction can be varied. In a region where a unif0febgpe a6y(d;r w .(porm magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about ann;j(+ 7nm- fmkuk0rqr axis whose direction can be varied. In a region where a uniform magnetic field points straight donrkm-nrm ( qj u+7;k0fwn, 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.ujf,u u4q /wi-7oxq us080t fz
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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 ti8 qnybef y b +ng39vzy*43h5xhat 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 fiel8xj jw 9 ;f1.l4ko4w5 zvhkqvvd. 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-wesxpy7 7.an9y fecss;,oh8b2q r t direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acros;fecn8ysqho7.b2r9y s7a, x p s 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 b :to 9ugl;lnv6ww,f hj;.5ocg ar rotates 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 tr u,3yn-tvltkry7 hwvi*ra7/ ; ansforms

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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 revol egtqt ;gew-(r0nf88wutions each second. The frequency of thee -( re8n0 wg;gtqwt8f $emf$ 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 devicqelo9jc( la6,8kcjg :e 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 tha,(b1o prxh*s nt

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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 zvkw fj66nk) :contains more loops than the primary coil thekk6)n: w jv6fzn it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than th+ v iywp9/bga-e secondary coilag+-yv p/ bi9w then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power i0yl y/,oxo*4g g av8i f0fb.nt-hu+lmnput

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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 circuip830 nzd nqz v.erhd7/t,

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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 ar r672t nzpkh6ge connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the khg t27nz6 6prbattery, 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 connected6t2s ca)/0c mtcc3ajd ;sbolyv0y +6b in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltageyl0/tj36o;asccacbsd 2 )tmv6 y0b + c 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 resistan/jym .;5 0xfaq db0svdce 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 inductpcpt4r41. n jyance 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 5kc )xh 6spqw-eqb*b-k. v a/8tzj*kdconnected in series to a battery. The time constant for the circuit represents the time required for theeh kc)-d* *s t.q5bzk- pbwjx/v8q6ak current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series topv:)+xi ytw6-xll x0.53(bgajqt wyx a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current y yw6(3.pl a+x)xxtjiv50x:bqgt -wl 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 fkq*k7 ny4je2 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 connectedn:go yn*,b,xan3;edu / c2rce to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. g-j jkin8ky;: 2ubx)gIn this circuit, the current8y)-nik k:x gbgu ;2jj

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor whe ojti/s+3xxfkv0mu3hug 2 4. qn+6q:qimas p+n the frequency is tripq +i3qsa.ot 6hnx k0m visj+q4pg+f :x2muu/3led?

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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 acros a7ymurh )7szu)4 x1xns an inductor is doubled, the inductive reactance of tha sx 4yxna71rh)zu7)u mt 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 voltage0/w bg) eej8hy across an inductor approaches zero, the inductive8 h0j) eeg/ybw 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 AC power supply. In this circuit, the cur/j:0f1a7nm+- xcon 6ezryo u nre of1:nuzmne0co/ r6ayn7 jx-+nt

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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 factor when the frequed9n t y(bp* 1q/mnms;zncy iy(tn;ms1mqp/dz nb*9s tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero,v0*7l:ngesz q the capacitive reaqgl ne7:zvs0* ctance 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 angle be p 85t,gqq)hmntween the voltages of the inductor and capacitor in a RLC s,t 8mqh)npq g5eries circuit?

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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 63* a uzf.tihgf2prt1 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 impedance of the circuit in6mgkvtw4d vq-+2*u qjf sa2m(creases if R increases. When is this statement 4famjd 2 q+vgts2mk -* 6qwvu(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 impedana(535knqq fi xce of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases if y4h,sshu(e 1(4at jix-y cni0$X_C$ 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 LRC series circu )u6xe(*kjn dhxr7c+ mit, the resonant f6)(hjxr7m+*cdx uk ne requency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuezfulo3oa g-e2 ltc4)5+gbcvi;3,u xit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuictcxa.j 1)(qe8nivl *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 rotating in a uniform magnetic field oo/aybpqv8tk5+ m, *lg 6wrwa 5f 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are q5vro k pay/awbgm,*6+58lwt 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 magg8fuqd:u5il2k ; 2 qx7ygdl2xsl * n.qnetic field of 0.20 T. Find the magnetic flux through the loop when the plane d;8x25uusg:ql*nf . 7 qiyqlk xd2l2 gof the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field oaonq nkqdb -qw6bk3 (kd*l+ 38f 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the maqd6 qbabnk-3woq(n 38k*k+l dgnetic 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 s/ wy;1 cdb:ne+c5ltwwoas f.qj7e.-area of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changesccnyq /9u8nm6 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. A er 6-qhy*i)go su ,o7duniform magnetic field is applied perpe*-gedu srho7yq )6i o,ndicular 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 15 tur1un wi-rg68 bwns 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 are(vqt 5vor/yf-1l )aala $0.20 \; m^{2}$ 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 4w;ft/vn0 jq6(p b cnj60 m flies horizontally at a location where the downward component of the ;ncf j 6 b0tnw4/pv(jqEarth'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 20d(bcwol:3 s )w . ithrzxrw*).0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends w )hd xbc*0ir:wzr o(3w )lst.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 ((r5yv2u 9+ itko u(fnrqm4pfjvy- 2i 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 wire qggl;h3 o5v t7of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. g)9 n:pa6lyy ;zj7ew z 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 uniform magnetic field of 0.30 T, which is perpendicyz a7gn;zwle)y6 j: 9pular 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 turn utg,ql-x u32ps 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 af bl8r6 g*i)vb simple AC generator with an output of 12 V maximu 8ibr*f)vl6bgm when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a d5f.(fmv; rv omaximum $emf$ 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 j(v0uw9f d y0pr+0jfe 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 mor9c56r j(na nxtor operates on 120 V AC, and when running at ncn rr9jx5(6a 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 tofy 0 6pqk:s0np a 24-V power supply. The operating current is 1.0 A. What is the start-up current00sy:n q6pkfp ?

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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 izrye4 x8 57f)onyxir* -y0uhl6te, oss connected to a 24-V power supply. The operating current isny4 hr 078f ,)ou s-rxilxe56*tyzo ye 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 suppls-xfx 4n3.rfd *d6gie /obmgk x/3,cjy. The operating current is 1.0 A at full speed. What is the back bxjg3 / c-sd. /kmd346 in ffxx*r,oge$emf$ 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 need fn6xz,8z,qfv ed to 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 primary of a transf 1sl6h zys54kg+caio4ormer causes 14 A to flow in the secondary. How many turns are in the secondary+45ok hg4 i61 lscasyz?

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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 i-o0 4k 3vnvlc*j/nxoll0bex. v :hx7turns are necessary in a 110-V primary if the 24-V sevl x4: loexv-/3x0n *jnlo0vic.hbk7condary 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 consist7tvm . ig6ik5ed j()1hzupk 7fs of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currentvkt5 f 1( )iphjm.de 77z6giku 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% efficiency6sgd+jw 2mje-5l;hw m , how many amps at 24 V can flow in th; hdmjj5 + 2s-ewlmwg6e 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. 2v)x x 7a- rmjgswl6 qv95.)a(altcam The primary coil operates on 120 V. Ws5 9 )v7cajarat.w qlv2)al(m6m x-gxhat 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 s0pwdhn16k((sckg)4w qxb x7on its primary coil and 300 turns on its secondary coil. Ibg0) 4n c6(whq kp(s1d swx7xkf 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer han nbh8mvpo3ifz+w+7. s 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pi7+8o+hf.3 pnznvb wmrimary, 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 iti zd/. :yj4v (fnb1ruys secondary has 200 turns. If the input current at the primary is 100 A, weij1. zv :br(f4/yu dny can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seco bt6r;g+q) 4ppcuqae5 ndary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outpp5e bq64gta+ q);pc urut 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 transformtu :(p2 iz,o*s:wcr2sp2azhher has 100 turns and its secondary has 200 turns. If the power input to the primary is :2htsp row:,ih( 2zuz*p2s ac100 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 u2hjttmcf u enf: /2mza f4ze/,x*11xup 1xf/*umt/ 2,n:4 af ezzjftxm2cu1eh to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 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 ush/en9rww5)wz d*ebc 4yi1n o/ ually stepped up to 4500 V by a transformer and transmitted through a power line of totd/ww *4y cn91z e/hbw)5oeirnal resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagncigr 8,xt m85u:kd,apk;x-be is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the vdnx, km;rtb 88 -g:k5iapxu, coltage 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 v t3sqf3i2 k*+pw p7iua 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 en iqtip*kuvfwp 73+32sergy 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 dww:;u2dab2rpw3dh *zy-k b6u ab0a3line 50 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 sw33dw 6urazdky-b2b da*w0abu2 : ph;tepped 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 1000n8 *n 27bleidp V. How much less power would be lost if the power were transmitted at 3000 V insl2pnin *8 bde7tead 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 transmgo-22.ky drs x9q hel6itted on 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 exceerk. y2h2gedl9qo x-s6 d 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0-5h anglid z)/ A. How much energy is stored in the coil's aid g5n)hl-/ zmagnetic 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 inductxw -67tw/8zx52o zr-fcpsxgtor. What is this circuit's t tgrp-5c7wz x6s/8xtf-w2oz xime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms volt)b10y yi30s;y4ep + ( knvcgaak,bttaoyz l4-age 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 c9obc4zb-3r-eq 9i w pwurrent?

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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 theakencdr/6qgj07a + ;f resistance of the lamp c;ef nj q6+agdk/0a7r?

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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 1gw t9oxewptyd24e)4 z)b uu9q,oof+ a 120-V ac power supply. What is the peak current through the roy4,uq+ 1 )9weweuoo 4 d)ttb 9zx2gpfesistor?

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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 powi0 4+(x)tqov3q pwtl ker dissipated in the resistor qq )ot4k(0+3vitpx lw?

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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 resistor is axsypjb2v .r7)5 ygy 1$I = 0.80 \sin (240 t)$. 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 re+mkuj*vw u m/;sistor 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 resistor isar; :/ rhgs l01n,fmap $I = 0.80 \sin (240 t)$. 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 1wb 0oy/mjmptb2t/,5,t6c b vt.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 x5f069l 6 qgkh j ld:zj1l9vlcHz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reac6jz+y 5vodw8vtance?

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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 induct6iy /9 hj8l7ukse2vqsive 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 frequenc -sq(gt(wj )ciy of 20 kHz is applied to it wc(j-igqs() t?

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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-mjl ,q-w/tk ez:8edrao0x-r x 7H 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 capacifrgxy0ye s q mqc,e;. wxsw5ui31y :,)tor 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 havujfv/j /c bl(gqj n)3u:/jy f(e 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 n1 xm: 9px w,k1czxk:wcapacitor 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-i:eaw knm*l ;nsz,-l*mF capacitor be 100 W? ,-szmnekl n*la *i;w:

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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 gv1pl g ar:f,.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 resisth .04muubrz g x:wf km00b3be,ance, 15.0 W inductive reactaneb rbummh:,wg3f 0x b0. 04zukce, 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, 208m+1geak g o9q-mH coil, and 1.0-mF capacitor are connected in serieq8km+ag1 9g eos?

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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 7:6ry+m3esleez v ) crresistor, 20-mH coil, and 1.0-mF capacitor are connected in series?l m 37ye6)r:ec srvz+e

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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 inductor, w jd)l ;zh28 uh1xu(*e hviq9ffhat is the impedance at 102q z;1edxu*hfh (uh)ivjf9 l8 00 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is tp ng7w)uxu:byv /+ij,he phase angle at 10,u/:ywv7 nxpjbu +g )i00 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 uk;3/flwf:guxk s v5 9a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W :5wu sgkk/ 39ux;lfvfat 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 needecg1298wiq(7lxcri,ahg * d xid in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at7aic hx 18gc g2ii(9w,*lrxqd 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 fohh6h+ ip/beucw*p zv w (t(7t-r a totaw(/pp +e 7 ihtch v6ubzt*(hw-l impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz forr gn*:b0wd exp)*r t y*uci6c, a tota ug*d:r,b**6 wnrep yx c0ci)tl impedance 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 connecj )2u u1u 0whd*msw-s14zwn oyted in series with a 20-mF capacitor. What is the impedance at 100nusoww1w0-s ) m14u*h udjz 2y0 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 capacitor at 1.0 kHz for a/t5dy+a:l oy:t.la fr total +y5y:/aoa f ttd r:.llimpedance 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 sjva,q5 jq f8e4eries with a 10-mF capacitor at 1.0 kHz for a phase anglqqv,j 4jaf8e5 e 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 lp :yyzde;. 3i1bq6qhin series with a 30-W resistor at 1.0 kHz for a total impedance of 4pq 63eyh.1i;qz:y dbl 5 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 :(b44smiplj hocjq 8a r r(d;gr)bm.q6*vv:ma 100-mF capacitor at 120 Hz. What is the phase angl hgm)(;bv sr o6d 4j:c8m j:mrab qrl*vq(p.i4e?

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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 resistory ,e js(bo 5tx1/: bnylen/8pz, 20-mH coil, and 1.0-mF caplp/ny1,t e b:z5b y/nsjo8e( xacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, aj:-m .:5dii r-rme9dgcuv3 kb 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms - m3kidg uemic::.5rr-9jdvb 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 7;frpj o2syc 7ni7of0W, and an inductor of inductive reactance 30 W are connected in series op7j2 07f ri;y f7sconto a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 5qcnqk5y )0 ,u mfu-8ls0-W resistor, a 10-mF capacitor, and a 0.45 8-5 kf, c0yuslunqmq)-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 nect k/.0b+mdw2. vwfu 5v(zm *axq)ngytessary in series with a 500-W resistor for a phase angle of*u)+a. x2m/vbdq0g.5tt(y wz nwmk v f $40^{\circ}$ 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 frequencym6qe tov d(: xny+--ll should the circuit be driven in order to have maximum power transferrdly:nxl o ev+(6t --mqed from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 Worop9xi9j+)w61l 4aq * y+trbk ikz2u inductive reactance, and 10.0 W capacitive reactance, when the circuit is cona 6r y r qt9b)+21ij4z+i*9kwpxokuolnected 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 nsmlop2 o ww47l4- yy3AC circuit 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 imped22,bgl,arg/nc vd 4 dvcui ;k1ance of 60 W and a resistance of 30 W. What is the power gdv4,;/cndg, ri22kbu lca v1factor?

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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 containin1zcwqef1zr .1jg s/jps8u7 f .g a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, w1 q.sc81ufejj1gzs7.p /wrfz hen 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 capacitor and a 15-mH coil in series?zhynvt:/ k1c4yz: hcn4kvt/1

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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-mnainpi h 8z6 )nhje0:4nnk 66hF capacitor for a resonant frequency of406nh8 6hienkj)nzn 6p:ni h a 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 wimu e 9;ik x ip,ce+/( qtefcf1cs9*o4dth a 3.7-mH inductor for a resonant frequency of oepeidfec /,t(c* f49iu;x qk c19+sm1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed ihn6gv +f862fgx lc: hfftj9o 7n series with a 30-W resistor and a 40-mH coil if the resonant frequencyf7f9hg nvtlhc2+68o6x jfgf: of the circuit is to be 1000 Hz?

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