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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magne4 n km--/ sue-sv4lluwkio3*lt33de y tic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that t:3 *t ap-6 o: phvq-ni:wk;fzyg2obcghe $emf$ 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 w wgvk *w) jpflt gx09d8j*)qn0hat kind of change on the indukdgv )08j *fj9 pq*wnl)twg0xced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces w( i-cr 0nkxih6nkeu 7o) (:y/lhyv uh9hat kind of change xe/uih)ri6y -:hlovuc0 9(n( n kk7yhon 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 l 1p;s,4 j cummv*ot/qiza*nu;oop of wire produces what kind of change on the induce *uvc4os*; q;ji1t/aznm ,mupd $emf$, 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 magnb/892f2 bnt vltcmf5,8k wley etic 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, thvb+8ic/ bufe4lbm z2hmn5( k8 e direction of an induced current in a conductor will bem8v + u5( fmez/8lkbnchb 4i2b that 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. v- a zw7ttp/7vA bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from aa /7 z7tv-vtwpbove)

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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 horiz /drvt(3(nzjrb x:z n8ontal table. A bar magnet is held above its center winj:3/(t brnxz8dz rv( th 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 tablenbnn)s5pw.frib) x63- fiqw / top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed bb3siwnn) /inr.q5x p)6 ff -wfrom 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 c(zdjp hxjg4cm, 3ayi3 6)j)0dqfp.bwhere 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 ,cj0ci (4adx .m)yz6ghp f qj)pd3bj3coil 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 horizojlr5ppbab(cu0jf( by w- k7r c32bxmd)2//db ntal table top in a region where the magnetic field points straight down.23 lw2 jx/7br0f b bc/ajpm-pbu(b)cyr (d5kd 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 l0qe 9 +vhycd6zies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced currenye0dvhq 69+czt 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 entels57 dif9 y3jsring first. As the north pole enters the wire, tds95l jys73f ihe 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 conjcj4.ou wk :za3gtb-q1fil c7a7-a:r stant angular speed about an axis whose direction can be varied.c4afw 1gujl-7 j z qbkcr:-3:aat oi.7 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 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 an2wd4.6 ub afwtgular speed about an axis whose direction can be varied. In a region where a uniform magneticdw6. atw u2fb4 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.aqm-rq/ qdw ;9
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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 the kv3+3tkt-(01bixf7hn ygmhat 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 magne1a6 ynvxc5v3ftic 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 moved northward at cuw6s- tmj b:/xonstant velocity through a magnetic field that points sts:6u bm- /xwtjraight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bcc 4-lyqz47ru (ear7dar 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 6)s/m d zvbr1ftransforms

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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 frequeqg39 44d ugyj;d k4a*f04 cwg6xlqjbh ncy of the 4;4cagh bw 94x6dduggqjyf0*j3lq k 4$emf$ 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 use(uxpxre/ rz3 ;+b/ma12ka6j b0a hdqkd 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 de1ys ,kf b3y w;ksxt9g;z d0owwgq;v /,vice 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 secondary coi;tiyd,hq* (wdl contains more loops than the primary coil theniyq( *td,w ;hd 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 the s5 z;pu-vd3bf e3lvkq7 5byt9 tecondary coil then dttp 7v;5 3u5e9q-bvbzf3ylkit 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, thexr3n2q -kz l hi-8wo)g power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonanl.b/1v h jurf+t circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are conwo..ma9 .u vhnnected in series to an ideal battery of constant terminal voltage. At the m.9 ohnu wvma..oment 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 ful ; ny6b2pe4/c (*hp22ufg hq 2gmrcideal battery of constant terminal voltage. At the moment contact is made with the batte 2plfqgn cc (4yg2f2*r uhub 2/p6mh;ery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is codi/m)p*3sq bi 7/rd rbnnected 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 L and whk.5g.z l 0nfresistance 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 inductot5cbuaoda/5 1r are connected in series to a battery. The time constant for the circuit represents the time requireddaabot/c 55u1 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 a battery. The batt-k9pv3d utzj2s4t : fkmd0 2/sskm3qn ery is suddenly removed from the circuit. The time constant for of the circuit rsdd 3f:2sp z-m2j 3q4k0/ s tkknu9tvmepresents 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 unii12-yw/8 le xrkudl3sts except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the xdh0rvo2s wew.uu2k/gw21 :vur q7 .ecurrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cuslahogs- 6 a*l15b3 gqrren1ss6h5* galoa-3qbgl t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when /fn+.- bjesozthe frequency is trijo/se. zfn +-bpled?

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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 AC12do8moz urk )im-)wt voltage across an inductor is doubled, the inductive reactamt-)iw oz2o 8dru) 1kmnce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC ,cfok v9:/y dqvoltage across an inductor approaches zero, the inductiq o/9 kvycd,f:ve 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 s7n8 cd:xlr2q- a7tj xq)l2vtmupply. In this circuit, the current2jr7 q-tdvx8l2 a cl :xnt7)mq

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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 fsc+g 7btf6fn e83c- rrrequency is triplc-3g7 8csbtfn+6f erred?

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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, the caihzt+;y 1g l1op jv,.xpacitive reactance of that1ghlo +jt.1 ;vyip ,xz 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 anq*pte c8a)p-8(nu w +nbpib6v gle between the voltages of the inductor and capacitor in a RLC seri*bu 6+eabvq pn88 -t(ip )nwcpes 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+4/wo7lgo4 aq c q;5og lz3 t3fqo4rdl 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 impedance oftg,rdt jb*-jj0saj.+mz/-/v lm+eql the circuit increases if R increases. When is this statement q-*0d+tma/g zr bjtll s./+v- jj je,mtrue?

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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 circuit increases i9z 6qxflj 0z5yj/h is1f $X_L$ 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 increasesbv1c6pf/b .mw 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 b -d4k1xgm ml82 amxzp(oth double in an LRC series circuit, the resonant frequency of that circuit wig-km8dz4p axx21m ( lmll

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonance,)yrhb5p( qu m;o o-+-pssf vn*ad;q *i

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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 occurs jo1b(qxjn cg6* jqv*5 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 roty j78xj e6.aoeating 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 vecj76o 8.yja eextor 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 magneticw:wg2ne- l..h :psdp t field of 0.20 T. Find the magnetic flux thr.w pw-h.t g::lednsp 2ough 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 rotating inwl jzwxg w8xpa)3w +jn+l7:(u a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loa jw: gl)+ wzljw3p7n+xx uw8(op and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop iw00 j*t qr7oqts 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 chancr 8i(huko7mq 4 +yhk0ges 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 squarev3s7qa k2tad iv:/h: n frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. 3hkivt::s2 daqnav 7/ 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 w phbg*5ued2y 2ith 15 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 a3serq ;row-u o jf0 *.5w7vbujnd area $0.20 \; m^{2}$ 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 ow(z ( g9ocy5ssf 60 m flies horizontally at a location where the downward component of the Ear( sycg(9s5 zowth'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 consta(g:vixj4eexn oj s2u5+8ary y;0orq5 nt angular velocity of 2.0 rad/s about a vertical axis through one of its endu2oe5o8y jgn +ayr j;5rvs(ix:4xeq0s 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 generatvs (7gyec.wl kmrt.60 or has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wiro9 uejca20ffy jw :.z:e of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature.x5 g. ;02nzhj,b2stfgp7ybc c Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side2xj;n7zg0 ,g bs. h 5byt2ccfp. 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 wirbm8 h 94/dsyvz7 hel0qe of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output odr 1wbqtn1 )kn)vh/xyzd.t*hd7zg3,f 12 V maximum when rotated at 60 Hz. A magnetic field ob d qynz1rdwt /,t) 1*vh)xhdk.3ng 7zf 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 ma n(qog3ft : f.g8;ifavximum $emf$ 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 h i+vey-1 o*pgmave 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 hav 3t,mkx/ e..a )i/ijess,a9 kojkkrt;e a resistance of 6.00 W. The motor operates on 120 V A3 i .k ,s, mxarek;a9.i je/jt/kk)sotC, 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 powe isqp:(vrt7,.yv:1ga awthd9 c5ku s1r supply. The operatiqcga 1hvsk :s51v,rt.utpi:9y7 wd (a ng current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to 6r9*wv3,xenqg0o r* e/t wdfda 24-V power supply. The operating current is 1.0 A at full r n,e0*9vg3r 6*d dwtwfqo/xespeed. 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 resistangjvmy gst,o5m l(mcaux2 9g0qi:1d1, ioc5 (pce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fuldox(mjq citl gcpy sg05gi5 9(u: 1aovm 2,m1,l 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 voltage ec;c 7zf qqjymfws-gl(l*wge4,g4-+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 transformezmh +.;*acp a4nu 0fmir causes 14 A to flow in the secondary. How many turns are in the secaa+0m.4h ;n ipmfczu *ondary?

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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 in a 110-V primary-8w vgo;.cv (a9f-zsmlty5 d g if the 24-V sem(v d-fo 9wtc5gs8zag.;yl -vcondary 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/ia*/os gir *e-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 r eo/ias* g/*iA, 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 transforme3 w8:sg-g jw5ls/ xhgqr. Assuming 100% efficiency, how many amp-/l3g8w:hg gswj 5xqss at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer pr v(qgavc7tm 1r5,v4 dwovides 7500 V at 10.0 mA. The primary coil operates on amdrw , g74(t51vcvv q120 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 k/. ls e kh;m-a9sb2a9dpu,sp turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the s,2.kmau9shd/p al bk;- e pss9econdary?

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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 turns on majhqmh5-) t q9+owz- xrjct)13sh wl9m c6 7aits secondary coil. If 120 V at 2.0 A is 1amj6o5sw9 3rl-q-ht7j ) c )w+xzma9 tmch qhapplied 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 100xx-c b )zts2dit2oc66 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current ix 62tx)dtc-2czobs6 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 7ckkds 8d2s(g its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the 8dk2 c7ksg(sd secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary h gx mb7j;s0+p;uy:gy p u6uyl5as 200 turns. If the power input to pum 5pbgyu jxgyls7u;;+0: y6the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usu( ;u/x3ik hj/xsrd a-zally stepped up/u ;kxr3/asix -hdjz( 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. T hsiwj.av+35 dhe 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 per hs3aj.vd 5w+icentage 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 ofl2v r9nz* ;fuh25y i)u jnr.rf current at 120 V. The voltage is usually stepped up to 4500 V b5 vih yjr)lfr2r 9fun*.nz;u2y 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 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 linelwkrd9at 3)c3v*pk /v 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 stepped up with a transformer with a turns ratio of 100:1 avwt/c*l)v33 d9 pkkr. 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 lm, o:l.4bg *yes zwc7bong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the origingsowc ,bb * 7zemly:.4al 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 much less power wouldf rtug ;a :nivs*9/qc h4s9if9 be lost if the power were transmitted at 3000 V instead of an u;a4h: 9f tifq9*rgsc/v9is t 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 on lu1sn(w14 0g1gqil bsa line with resistance of 0.60 W. To what voltage must the generator o0uln 1lis qb4wgg(1s1utput be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much ro eqm5.p):oienergy is stored in the coil's magnetic fi m:i)p5. rqoeoeld?

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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 a j2aobi:nv4m.nlc6,s n 18-H inductor. What is this circuit's time constant?can2 6:l4bn mj v.osi,

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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 theyra*;j+-rx :xryrqi -4r(xat 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 placedv7080c/wb x mlckprvv v( -a+t into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into p/i0-wjjyi 9:e 6cleha 120-V AC outlet. What is the resistance of the lamljjp:/ eih9c6ew 0iy-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 x 4j :prlfa asrf+p*19d :. jt/wnr(zdpeak current through the resisd(.l wpdp as :/ ft1nrj:afjz*9+r4rxtor?

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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 lpo- ls041v *stzrg1i4 nq)lsthe power dissipated in the o41q-zs si1l p *)l n0lsr4vtgresistor?

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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 5 kxmt2/wloac) y-ln*.0-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 resism.(goivq 3z 2/ eopa*ltor 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 ;w)h+ yhbr:)a;,ndsckccn) i50-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 indeqk urs3q7/s mai+o4-6zdbl.r8wes + uctor 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 gu( n 7fwqwpg2y0xhd2q2gmo -,j9tc 5 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 coil ,;pkqd9iwb b//whz(v ye(s -h5fk tx+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 necessary6u0dy)woi3x o 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 1200-h vqbftg.*x V AC at a frequency of 20 kHz is 0hbxvqt*-g .fapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-ijol9 r8/o.8qi0ncop 3y (anpmH 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 reacrqkf gugbpo,pom3ct(a5w*t/+pt/- qy+ 1 y ;wtance 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 isi u*17i)-; olvdggzsb -z8rkwxvx il*h5+g *w needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 12t/c9k g7 ywe.f68a+ zy pu9caj00 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 w 6l7m2ftubwf 79:z h c7qun2dreactance of a 0.010-mF capacitor be 100 W?22f7mw qdu cbl7z:tuw6h 7nf9

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 )ficsf 8u2mn q:-:pwoHz 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 resistanih8g.5ob 8h ofhp-;fice, 15.0 W inductive r;8if.boi 5o8hh -pg fheactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and *ny0zn*eu+pj 7kx2 8qlc (dqi1.0-mF capacitor are connected in sejq*nnl*ci+2z0 e (7 u dpyxk8qries?

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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 ajnp8 xm i+1ctve 0v8w)k7t o/100-W resistor, 20-mH coil, and 1.0-mF capacitor are connvajce xt m/k8i078 )nw1tp+ovected 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 ,s hj h/d qxbg5p xe)qhmn8xj 3z1,v76is connected in series with a 20-mH inductor, what is the impedancemq3 7/ 5j,s)e8hxh 1gvpqx6 hxn,bdjz 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 20-mH y.59gn(emz d, /kp xjcinductor, what is the phas9gcke5 .d/ zy, (npmxje 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 caprk(am0 sj m7w aobg2wf(1rw*(acitor for a total impedance o10sw2aarg*wrf (jm(7(bkm ow f 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-W resistof.n6j fne1va9r and 15-mH1nnfevf .9 6aj coil 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 5000 Hz fo( p8ek*-1xw oq vgy+.is. tyzfr a total impedance of 4xyk tf8. eysi-wgv1 +( .o*qpz0000 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 k cna/hhdo3;9 1.0-MHz for a total impedance of 1 kn/h 9c;3odha50 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 conneqe2mp7gw. nn :n 2o4qdcted in series with a 20-mF capacitor. What is the imped.2dgnm7qe 4wp nnq :2oance 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 forn*cd;eigs61u zfxb7 h;a-*na a total impedance of 45i-faadec ;;z*nx* bus6 g71nh W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mxfn43zu4x e hj*v6b( gF capacitor at 1.0 kHz for a phase angle of x4e 3vz*(nx6 fgjbuh4 $40^{\circ}$?

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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 wit*w09 pk8k)kkkpc* e o ziuq:g7h a 30-W resistor at 1.0 kHz for a total ikp 9koq8kik7g k u0:e**pzcw)mpedance 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 capacitor at 120 Hz. )wywa,;oijxd g85vztejg1 + *What is the phase anglew gvy)+1*5oi e a8wjtg; j,zdx?

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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 cos nc+my**bgq p;h0 p*xil, and 1.0-mF 0nq*h*+psm ;ypg* xcbcapacitor 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, a6 6 j+vr+kx*vw2izpdbmw-l p 8 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 62+w 66b8d pjzpx+ivlr *m-kv w0-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and anl 7u 2xxocqg6r8niz .: inductor of inductive reactance 30 W are connected in series to a 110-rnuix:87.xog 6zlc2 q 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 apl :.b. xifwlsi1;g n8 series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,n x. ;:pifsgb8i.1wll 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 io/ro:g0 gov* f, pecd+n series with a 500-W resistor for a phase angle od+/:ocporge g,0*voff $40^{\circ}$ 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 freq/nzfpnb mu *,(uency should the circuit be driven in order to have maximum/p nz(,ufbn*m 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 ac series circp+8gr:oy1 +k2 6sv mtc)fyvfauit with 12.0 W resistance, 15.0 W inductive reactance, and 10.fy+t :s rf+v)6cp18yo k2ma gv0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuiy3) (tvmu4 unnt 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 resisktnhojmp 2 40k(u)zp- tance of 30 W. What is the powmhk2( u ok0zpj-np4) ter 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 aw pdfr)xf;9n 0 series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppnp 0xr)d;ffw9ly?

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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 7, 5nsd p7kh u:fglj8s2 0cgwpaf)+yycoil in series?s, 0) uw h5d8jk7pyyf 7n+sc:2gpflag

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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 vkj0 :eypyz*8with a 4.7-mF capacitor for a resonant frequency of 10 kHz?*vkzp:eyj8 y 0

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant 1s/e6hlosr vrp24a 1yfrequency of 1000 Hz?eoah1s6p24/1lyr s vr

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 4 xeropw*fy1ek * xh(-10-mH coil if the resonx *1rkh-ef oxe1y wp(*ant frequency of the circuit is to be 1000 Hz?

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