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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 ar* euacq 10*kv1;nsmlre units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of ind7pfan; d9os rw-k)4gpv/e5 fouction states 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 kindi 8*4wqlj qjqhzep /0icx* fi;iqnp/ u 6wt884 of change on the ip c8ji w6ii t4*e /f0 8jzq4pulh *n;wq8xiq/qnduced $emf$, 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 p8bwce3 c*lk2u)s x7e 6 ns8opof the magnetic field through a loop of wire produces what kind of change on thepbc 7wcs8e epn)o2*8ks 3l6x u 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 wireif)2oktb fuq z5y wxwcil*d6 )*083zc o*mn/v produces what kind of change on the indui2tic /nxbw580y3)f6k z*qwufom**zvo d c)l ced $emf$, 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 magnetnukz nc7k7 (.oic 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 direct1;: ict-g)qrabx mi2u ion of an induced current in a conductor will be t)r t: ixg2aqi1 m-u;cbhat which 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 table. A bar magnet is held above itiuw1;caxkn;cc8z4ty*qael0 2+r zqmsy4n5 .s center with its north po; z +ur ta;ynw xi1*.24c05qn4me cayql8sc kzle 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 is held 7i7w2n hf 7bduabove its center with its noni7d2w7uf bh7 rth 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 dc/byoyg; )ht9(ucxu5hvd3y/uu7.zvector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fade3 o.yy7)uu9zcdh//; vx dtbugy5hc( us?

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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 levex,m .nxea5j /ul table 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 th.n ,mu/j5 axexis 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 horizobk*7o1b/s 68tqu1 l nob7rdhbntal table top in a region where the magnetic field /s7tdhb7b*lbbr qnu 86o o1k1points 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 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 amikt/l r(7 x7c horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wi/7ti7 (xmclrkre. 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 pto.jk n ;/pdwczye5 qga;1j g9f.3bv5ole entering first. As the north pole enters the wire, t./ v 5b qp5jykd gacgwt;ez3fn;j .19ohe 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 angulalafnp a)o/9lss/(jo8 23g vanr 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 pf o n slov 9()lg/8najaa3/s2loop'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 whosg*kmdbh :+ ,boks.d6t9(hjes e di (mhs9bjkgeo, t*6: +dbskhd. rection can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if 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.x:0slw wfu(t 1
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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 av/ :7lu.v.pd sz (s dw(5jspwjn $emf$ 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 fi-bo(fvai n2c .av,fke6yxgv7 qc*2s .eld. 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 1xw s :it h7vnrd3a)d;in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potenn w7x31strdhdvi :)a;tial 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 )76 glke r gn8kkx+/ bb0;bkgcvelocity $\omega$ 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 transf:/7 b.gvw/j*ckcm llpy-df ; porms

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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. f :i; ysknb)b0p2uz.jThe frequency of thn i2bz;)0:.k subyfpje $emf$ 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 deviuw w,4aqp p 8u8cm;ibpf j5+hoyps av(78o0w2ce 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 dev2hg z7el,4 h76cvsi zpice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secod sqs4hc(7u1-ynpz5li ; h/kendary coil contains more loops than the primary coil then it is5 hn-yl; e z/d7uk 1cqi4s(phs 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 cy12sl ert6k dag)nbf5g-1 la6qm0/g uoil contains more loops than the secondary coil then)s1l 0rma6gy21 5bl ftkg -qgad6e/un 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 inputh1gmr jhi.vgtk 72, w*

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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 cb; zky1q h jt:8u,2sf2di xco,ircuit,

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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 indug 4+kox)y3bis ctor are connected in series to an ideal battery of constant terminal voltage. At the moms4o )bkx3+ yigent 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 an ideal battery of constagf. pw9 uof*d-*-lnzant terminal voltage. At the moment contact is made with the battery, the volta**-g9wud nl ff- .apzoge 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 connected 7n6a1(q0hz(urn;qg cj .jwlc 85ivo mto an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected.e/ xjm 7z:p qzu0so/z.j f0jc 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 s7hgd) e3r9ch in series to a battery. The time constant for the cirdh79e)cg r hs3cuit represents the 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 in series to a1z6xr32ixkgro h(4jh battery. The battery is suddenly removed from the circuit. T1r3 xi6j2kh(zro4gx h he time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have;wdmt-vkx +6av;x i0s the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply t e 6ovia:-jd5v7/xsl. 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. ,5wpja.ux 5ax In this circuit, the current5ja5.xa, uwp x

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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 *ajlhlybu1l)y 4 oh r8g 64vn2factor when the frequency is triple2jr hg8)hv4lyb noa4y1*l6 uld?

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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 5eb xz)n8ti n,an inductor is doubled, the inductive reactance of th5nx,i bnz)8etat 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 ind pu vwvjh/vym(*ku74g,cds b00ryha9z r168suctive reactanc46zugyvv7jhhw8a /v *d0y(9 c0bs1rr,p ks u me 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 currr8*yqc s(bne0jmj12h esby* m2rc( j0hej qn81nt

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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 changes8mh0 pjub 03kt by what factor when the frequency is tri8b 0k03jtm uphpled?

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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 capacitom o7e0jf;hr-j fwz jl62kr15ev ;,zohzk kl09r approaches zero, the capacitive reactance of tl06,kkv2j0e9k5f fr1 ojezrz;hhl-7 o ; mw zjhat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of thexji znhb4dx :i w9i-p2, :4d 3bglhmd/ inductor and capacitor in a RLC series circu4dh9xx/i:4 g, 3p2: bh zibidm-nw ljdit?

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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,72 zd,.stok02 bsuerwvahm( 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 im 3snyc,i ui/h3pedance of the circuit increases if R increases. W n3 /sihcu3,iyhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the ciqc.h8 x)l 9-ix 8tfjvmrcuit 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 impej* p/kwm3 uew7dance 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 an LRC3cbnt 7x( we adt4r9s6 series circuit, the rnt6 wead(b4 xc7s 93tresonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is dri wmtcvez4fj 2*1o4fam)u ,-ahc5we9k ven 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 circuit ocd4gn(r ;kqt0cqktnw *o 2 a02kcurs 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 i( 9hmzyy5yon:m 2o wr5s rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lo5 yo n(:5m2zwymr9ho yop 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 field of 0en x m;0lytr wjml(()).20 T. Find the l emj(r)(wtn ml);0yxmagnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rot: q4/ef36 bzalucl7pdating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle odpz476:/leu c blqf3af $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singurt u+va5.qm0le 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 chang9lnku 94s1ehj+ik f2g es 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. qt1;fn (hm:xbdyq z7 72ylcu 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 tyycqz1q7bl;u(hmd xf 7:n2 .in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and anshin stlab. 59y/; 0ly 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 area crah(jb9m2s 1 $0.20 \; m^{2}$ 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 horisv4 1bws:o7ki zontally at a location where the downward component of the s1k47so vb:iw 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 tsol v(brvgy nu0 x9.cf7q l7yy10 6.rrhat is 2.0 m long rotates at a constant angular velocity of 2.ofyyl1v7rq .b rx(s0.l uc 67rgn0y9v 0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectionalt06jb x,r/ hh3g,fi qb41tit fc u5:bw 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 consinu5rm5*wf2fx )r/kca g vz5 1nsts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 rectang)(qxreh) b af7 jphl9lu5x8j9ular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will bb9hj )9 )j fa8llx(5qhxe urp7e 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 tavi7k rfzia., ynr u1p7f/ 40gurns 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 construmx +z3a,e pd/gct 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. If the ped,+xgz/a 3marea 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 z d*fbo7c/i *jmaximum $emf$ 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 m emz*fm7 57-gnmh3+0xgaxbs dotor 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. Tta4 uo3jbc w0lm+ey+*he motor operates on 120 V AC, and when running at full speed j a0ly4ue *mc btw3++oit 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 resistan+7won qi-1 lqrjtt/ dxt+5j z0ce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current +-n1jw+7ttrtq50 oxjz d /lqi?

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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) 4w hywjc5dsy2r+v,t 24-V power supply. Th w)cdh+ ,ytwv24y5j rse 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. 84)hbuz 89 m;hccsdvp0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is z4p)c8c m; 9hbh us8vdthe 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 transformergqmgh l64euv yx*k09/ .dq;br /e nhf. is needed 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 transformer causes 14 A to flow in ikma 8 t 4(,icutk;6vpceg49t the secondary. How many turns are in mik;pc9tk84ac, ev6 gt4 iu (tthe 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 necessary hch1ut +c +)vc3vbw4e in a 110-V primary if the 24-V secondary hhe )4u 3+1vhcwvctcb+ as 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-trjiy7 kke1 /f0 xxcpbi0wq-(; urn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current iki jp;e0 f (qwkcy10 i7bxr/-xn 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 9) e, lde4 fxcex96 fcy*h:monof a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in txec )o4lhcef9:9 xfy,n 6m*edhe 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 at1qnt qjf12 k w:g0(gxz 10.0 mA. The primary coil operw2 g:1jq g0k1ft(zqnx ates 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 t 2sgc0 q-uyh0f46 3t e0cevrsrurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presv4s0 -he urscqg3fe6yt0 2cr0ent in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnsps6,k ,fo 2tym on its secondary coil. If 120 V at 2.0 A is aymo ,,tp6s2 kfpplied 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 transf-lj-( ::gatu-k 7ywauu(zzu o7: fbaqormer has 100 turns and its secondary has 200 turns. If the input current at the prz-lz-ut (u7w ( ubqo:aka-j:fga: uy7imary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2009wl wr4-n;nlky;- x kwh7d-na * /xoqa turns. If the input voltage to the primary is 100 V, we cawnaaw/ - ;wkx od94qh-7;n ylx-*rnlkn 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 trans7 ra*n-nrm3.lz ur ej5+t8d atformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we caa+aur-ezjt3mn rt*.8 r7l5dnn 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 12xb zbaw;s96k (0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitte b9s(k ;z6axwbd 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 isukc emnin6ts;ufn g6yp6 2)kd:i *3c (3-loee 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 g3emoc6e2eyn6-n usi 6 n:iutcpl*;kd3)f k (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 Az +6i(x ;t,r e:repyui 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 percentage power lost in the transmission line if the voltage is niey:u6,zterx(p i+; rot 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 tot(s o cwm:- og/ta77g1o) vwykcal 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 voltagosom: kag (- g1wy 7t)c/ocv7we 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 lon dvf pbt53-vey 34 w9x4s7txuag has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce enerx9 ft-ay4swuv54t 3pebvx3 7dgy 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. How muc9tg cxrp 69hi1 i)uru7h less power would be lost if the g i 9c) rr79ti1h6xupupower 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 transmitte iuqxn20yd134emisrd wq3 t) ;d 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 exceed 0.010% of swqd4302xr t ;qi)nmui 1e3dythe original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is snm5. c1uaj8ywigrw wp,81 t.rtored in the coil's magnetic fiwpciu.gy.r8a rm8w wn t1j 51,eld?

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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 anogr h:sy ur(n3xn fbiuu:*92 (d an 18-H inductor. What is this circuit's *2x:( 9fyb:s 3 nuruhngrio(u 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 cirgg; j j4ms8j:;vh8r nh4 brw1mcuit 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 9zilk a0ocp emno*8 n,+4qnn+peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What iqqy+1 yx+p.ff,sf )zm s the resistance of the lapfy, mqzf q+)xs. y+1fmp?

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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 1nwn i qc8 d;lo(f9ni9ac power supply. What is the peak current thqfiin9;w91oc d 8nl( nrough 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 conn wwg0q,w8 qjxb 4bg(3pected to a 120-V ac power supply. What is the power dissipated ,bw4 w pq0j3 wgbq8gx(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 s:ao8*7cfs 32krhwof 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor iht5e1yr8d;0h9p a elks $I = 0.80 \sin (240 t)$. 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 is) paiulua2* h e*v4/wg $I = 0.80 \sin (240 t)$. 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 nd+v/ *jqa3 k3k5q dkaof 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 reactancea4v iv0,-liic wczsg ;6*j3p7h yjci7 of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH cg2ld1hw, v;,b0k f5y j tmec8voil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W y7kbmzq-b2 p 1i 1ap*tof 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 kHtg cyb+q5ejb,a:f5 b/z is applied tgbcaj ty5+ : ,bfq/5beo it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V,)1ni9n 0hzus0 /elwawkih my6qb*p -, 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 rea3k15b(d 9dkr 9j(a4f ovim asvctance 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 W ,ovanxe2;4ipt-a 1g wof 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 reactan-da8o- zlink;,3v7 ;c cywyxt f o+p/uce of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor ;2 nbru( irm9o)n( liobe 100 W2b;ir liouo (m9n)(nr?

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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 pcsj*rh .gy /+0f4zu)qz4 yxj m5x w9dthrough 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- kv,rep-nttcw /r .*b 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive-- .btvkr cer/n*wtp, 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 otgax f w4(ujxly u0r80 6--bi1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor wu-0 t (xa o6bu0igf lr-xj4y8are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFxvq41,oega v5 capacitor are conn1qag ox54evv,ected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in secbf)d* d79 pwl)kc+ jpries with a 20-mH inductor, what is the impfj97c +lcd)) d pkpbw*edance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 2ff-nk 2exk6 z/0-mH inductor, what is the phas -ff6enk2 xzk/e angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capae* y+ryi:kiasr:(v2vcitor for a total ia2k:r* :ivys+ ryive (mpedance 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 capacitancess+ e+ 5qhx7juz is needed in series with a 100-W resistor and 15-mH coil+s5uj h zq+7xe to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 500g:uz;r + j.ggfr-;ylj0 Hz for a totaz j+;; -r g.:lgyjrugfl 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-MH3 tz9ix4bj ;yoj uzlt w0a19qrs2yei: 3+8x yxz for a total impedance of 150i0e z sb; z321:riuyo wx qy3tt 8l9y9+j4axjx 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 w*6xwvep.xj):m s fc* meek,y/ith a 20-mF capacitor. What is the impedan:c)*.sfe6 myemvkw*,/e xxj pce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a tota79x)ayg7 kkuly mj*puee*5 *al impedance of 45 W?7e*7l myu9paukkj)ay e**x g5

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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 serijv m wt:6r zsmjz;:1p0es with a 10-mF capacitor at 1.0 kHz for a phase angj1 j6 m:;:pmwr0zstz vle 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 vik88k:f 7h kfi ;z-bnat 1.0 kHz for a total impedan k87f 8nvkii-;fk h:bzce 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 capacitor0l0km x) exzc h-8bme2 at 120 Hz. What is the phabh0 x0 zemlm2-c kx)e8se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz iz-/b*g 0jbm 8ah npc( qj,e.inf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in senm(e, hn/ -.z08bjgb*pjiaq cries?

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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 onj)pvrbq m2/*2aagrq(l2d d4f a 100-W resistor, a 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 current in the circu4 a*2qlrrpaj)vdngm /d(q 22bit?

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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 dnqjs y:ahixy0d;gak0 m5;7( W, and an inductor of inductive reactance 30 W h xky0m0a:;j da;ydqi sn(g57are connected in series to 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 conthku,1z.):ofnmo zq:r aining a 50-W resistor, a 10-mF capacitor, oknz .,)zrqh:1f:ou mand 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 serz ene+-(rdfbn2z 0k2r ies with a 500-W resistor for a phase angle oee-r+2ndbfz(rz nk20 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 frequc /j7 xs5--lw wy0,bilmqx.akency should the circuit be driven in order to have maximum power transferred fr-wqxkb0a5s j -m/li. x7,cywlom 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, 15.0rb5 c7(d5q ftp W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12pt5q fd c(75br0-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 circuit ismsw s 31g roh06q;czv8 $63^{\circ}$. 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 szo*:6ou4n 7wc rc+kf W. What is the powe:kw sr 4zfu7c+o*6con r factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a seriw)rn aa4(bttv*,*h7ow5b y3l ed 8aames RLC circuit containing a 50-W resistor, a 10-mF capaciav* *mo,r a7 en8tlbad 4)y5ha(tw3wbtor, and 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 frequency of a 1.0-mF capacitor and a 15-mH coil in series0q;rz10b/ rvul gd 7kd?vg1rdrlz0 /d 0ku; 7bq

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capack0 r o 4yhkz,m)koab 2.m9t3yhitor for a resonant frequency of4)rha9o3 ykbkzom,.20yhkt m 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 wie fw9e frmpavg;z. iceru7ql:n.hw+ d1o; 0.2th a 3.7-mH inductor for a resonant frequen7or qcifve.0d ;:ln.a ghe+; wmf21rwz.9 epucy 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 mustoqhs8*cq;el al6 fbeje8b1 ,4 be placed in series with a 30-W resistor and a 40-mH coil if the resob4a*,j seoeelf;l81 b6qqc 8hnant frequency of the circuit is to be 1000 Hz?

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