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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 magnetic mu 5n wae zoj*4g;iq98eh91vq 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 sav t n4vdqo::5.d k, qqm9b2qmtates 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 5h*dn l2a b(3uztx r,iof loops of wire in a coil produces what kind of change on the inducedt 2z,l(* 5ra b3dnixhu $emf$, 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 magn4aau6w x.f((fxm5 w kmetic field through a loop of wire produces what kind of chanx.4 ((wamx6f fmkuwa5ge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kink2hve8xo5/h(*l : pxu fdl7m vd of change on the induc*p 2mxlfhxv8ke7 5hvlo u(d:/ed $emf$, 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 magnetic field aidh /4rdcl7tf04 ctb,n $emf$ 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 induc0r31,q(kypezh qyi fze0b i5 8ed current in a conductor will be that which tends t8r eqhp01 bi,q3ei zkf50z y(yo 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 magit/qt(ab l/ n.net is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abov.itqba/( /ltne)

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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 hvpo/ro 2rgyo s874d i2orizontal table. A bar magnet is held above its center with its north pole pointing down, and re8rs i4/22gdor op7yv oleased. 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 regi5 2/sj: ohuyv9f4tckl on where the magnetic field vector points straight up. The magnetic field vanishes suddenlyyf/k2t 5scou: lj9v h4. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level tabl7vdy/, f:kzjrlq 5 -vke 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 indv- 7zf j5,/qvk drkl:yuced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where,qh4ug9znpf -fak /j: the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in th-fgzp q4 h,/ujf9ak n:is 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 horizo14bw f;5bk wxu,pe*nj ,nec7 l4lgdw35 him ;hntal table and carries an ever-increasing current northward. Two coilsj w,b*,ef; wlg45 m43 7x upb;w inn5l1dchhek of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nor44pe1 uov(kss/nzca +th pole entering first. As toecv1nuaz p+4sks4(/he north pole enters 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 at constjmwq09(gr-+8 :bzyk 3m 2ujeo0r x46r wpzaxzant angular speed about an axis whose direction can be va: rq r+mwj zjg3e0y2 -p9xz a(8x0rmk46owuzbried. 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 constantqm /lza*9m0k8awuj o : angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the*a9ammq/ lzk j:0wu8o 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.h ,t,2. ktxc1fpw k5bt4w8 sej
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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 thak,tlv+ej+x /gq7 nx* yt 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 fielh(ftf z7r)2 qld. 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 afouxid2 ).bv6t constant velocity throug ivf.ou6b)dx 2h a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at6lb0bsz:m v 2 uwbnq4/vr1d v7 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 tr18 mp7gpeu fz6-rlb 15fnr 4waansforms

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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 t3d9w u j/ksjv6hrough 60 revolutions each second. The frequency of theud w/v3jkjs69 $emf$ 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 d urb bq(beh ;7y716egtevice 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 de(ywtb 00 n(wcfvw-nuh+wyc1 3vice 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 coil contains more loops thi4psx1 d hk*p6an the primary coihxd 6ip*s1 4pkl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the2u) ysfqv8hmt +z0 2bq secondary coil then zuqq0 2mhy t+82v s)fbit 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 8fxx vycq;kld(/d n 1+power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circjeutu 1m/00/x2vxdw cuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cons *)vp ul-f)4tzdx(p *s qecaahh9,d9a(llc, k tant terminal voltage. At the moment contact is made with the battery, the voltage across the resihseq* )lvtd)palu ,ah9z,( l( afc9xcd -*k p4stor 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 id8 *qz4bsufx *keal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the indszu*fqb 48k *xuctor 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 jlagxgi2 a 8(la:m3 :his connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conn.euqiya(q:f)k kb62h ected 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 inductau(rn5fer 9:r ,ibu, mor are connected in series to a battery. The time constant for the circui,er 5mrnb9iru,( :f aut 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 sjsr*4ajzasecs3;x y 0 .ayb/ )ov:6gqb b)z(are connected in series to a battery. The battery is suddenly remoa / 3.sy6xe(js)z; a*a:4q o0yjzgsrbvs) b cbved from the circuit. The 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 the sam 7gq-bzcv 18ige 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 s(.j0c ed..r t *egnewhupply. 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. In this circoxes,0 mk45fouit, the currens 4o 0,mf5xoekt

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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 the freq/.gr*)vro .dyh5 xcjtuenc.j.5 /g*tr)chrxvo y dy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is criz1; *qj4t;:mca y kdoubled, the inductive reczc;:;m taki 1*4qyjractance 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 voltage across an inductor approaches zero, th7ca :0:tgg nl xw;ava(e inductive reactance of that coixv0:g t7ln:aa(cg; wal

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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 cw s6z-b esz6*g)mwt /an AC power supply. In this circuit, the currens)z*s wcw6 mte6z/b g-t

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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 8 d1)en zlz5/wyl-pmzthe frequency is tripledl8w zn5/) dylze1mzp -?

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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 approacheyw-j;jdjv .+h 6hgxh21oi i 0qs zero, the capacitive reactance 0;gv2j q-w h6o1+.i hx jhdijyof 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 angl4 7 goutk a*xpzj8-rne23i(l z0k u-oke between the voltages of the inductor and capacitor in a RLC series cg802 zeu3zluj--4( ao7nxork t k*kipircuit?

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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 c gdj* 6ux8yh9aircuit 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 increases if R increases.4n+chi 1s y7jokd5 , wzkwfk*( When is this statemen *,1 sdocfw7 nkkzi( jk5w+y4ht 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 circui qnzb;x0qa sd4)ji1 r7t. The impedance 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 increase3boe dq2 14flvs 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 ep: -zuq; ,uv nqf.)iwdouble in an LRC series circuit, the resonant fp-u:f u w ze.q,vi;nq)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 circuit that is driw *iott/homo:1mt: /uven 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 occgn6 bin e-5a.jjwdo(5urs 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 rw0 w0ofxtgf rd8g27 r8adius 0.10 m is rotating 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 vectfg80trr8 f2xo70d wgwor 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 rotati),3.ld4pty rs g m(qokng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnet), 4 lgr.dk qpo(smyt3ic 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 mdtc tzwcjsx 6)c5q0fhx 5, z/, is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thefs5/6tc,d0 5t wz)x,hc z xqcj loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable sie y2bm 6ng8 a3 ih t+4nlv)9(dzsto.lbngle 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 cukc1 *le)*y syoil changes 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 ohn8/k* 4/iz,qtuj z yrf wire on a square frame with sides 18 cm. A unifqt /zrz8yjh ,/i*k4u norm magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and anpm2m, ugpg6s2 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 andz5 bq. 1 xh*25)i,lgwcgmsr u+dqn;ya 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 of 60 m flies horiz5 v+tw*fe-c x0d)jflzontally at a location where the downward component of the Earth's+e)tcxdfwjl5 z0vf * - magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant a.sldf b3w0;olb . wnc83bcz;angular velocity of 2.0 rad/s about a vertical axis through f8zc.n bsb;3cdo 0awwbl 3. ;lone 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 c1xy-c9cj9slx 0 ut 0ms6x0srhross-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 o5nw, pz7e 70wtjbw edg)0lbq0f 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 rectangular loops on its armature. Ea kvu0p( xf. (l2vof*atch loop is 12 cm long and 8 cm widepfva.t o(f*2 0uvlxk(. 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 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 wivyx;6 .im j,iywa7xu 0re 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 simp6 . rjawtnc/v4le AC generator with an output of 12 V maximum j c6r/vt.nwa 4when 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 maximu c 5m(iowva36um $emf$ 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 havemv8wl,cz03vb.)e dnxcs* c 1a 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 motorg0tq (s;p *ofv operates on 120 V AC, and when running at full speed it generates a b 0;(gsfvto *qpack $emf$ 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 coylpv:,7(qlw i6stc+ o nnected to a 24-V power supply. The operating current is 1.0 A. What is the starp:+w,6(oyicl s t qv7lt-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 xafv,wbje 60b838cno 6.0 W is connected to a 24-V power supply. The operating current is 1nwecfxb, 6 o3vb08 ja8.0 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 resista yecw*)jxo: lkwff4 0fnn +6;gnce 6.0 W is connected to a 24-V power supply. The 0wljy6 ;+)nfc4*fw: oe gkxnfoperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary volvow9/ 8mni+h umg81nstage 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 the;9z 01m cls(dndl/dqx secondary. How many turns are in t1(c;dd0 qlszl9m dxn/ he 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 in a 110-V /j5hn-bpej,s iwokn24.2dto+94qecc: ewe s primary if the 24-V secondary has 100 turns:-spoehe+ w.4e jb/n 5 ,q4o 2cc jniw2t9keds?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn pq03c c-rjgtakx n8 8ywi:h 9d7rimary coil and a 2000-turn secondary coil. If d7qc x9-ncgkyi jh3 awtr: 880the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary ofwxb:v-k2nd+k))i6 q g hpa-kfe (h7x d a transformer. Assuming 100% efficiency, how many amps at 24 V can f7eid(nhpfgx)- b-)vk:kxdk2 h+ wqa6low 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 transdl3n-b+s s0+1 t- mfvjpaj tki+sg*a /former provides 7500 V at 10.0 mA. The primary coil operate*ia1-gs +nb0v ps j d/t am3+sjl+tk-fs 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 a u3t3riu.3tv fzk8y i*nd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primaryty3u33kvi8 r* ut.izf, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnu :5b4u)ietxdm8d8g6 s 5hjg) 4t ebxfs on its secondary coil. If 120 V at 2.0 A is applied to the primary, what currentg6 e)ub5d8xg utjfb m)t4xsi 4dhe:58 is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Ifz5d; caq op3.f the input5q fp3da ;co.z current at the primary 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 5i*(mwbxj lh0sx/j)*/ ykd6bm h6r jhand its secondary has 200 turns. If the input voltage to the primary bm b6x//jm*hi0jw)(* kly5d 6shjhrx is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tua+qo - ny)of4css22 nkrns. If the power input to the primary is 100 W, we can expect the power ou)nqk 2s4c oyns2+-afotput 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 9 hzggskz37kp pza33a.84 xq rA 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 number of turnzs 3kkh38rxppg 97zz .qa3 4gas 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 currentvd0y7 i7o fyujbmn.o:1. pt 1g at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thm1u on.votj0yfp7. g d7b iy:1rough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 12l ofc, ,jpok270 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 not stc,,7olo2jf p kepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. 6 r*c.p)l-rz v bkl.tdA 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. * rll6 kpc .vt)drb-.zWhat 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 linls;5*9tppb 1m( vx 6oex6 vlkfe 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70p(9vlt x6lf5vbm1 6xk o*e ;ps A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power om10xni ugolloa/ ,1f9b b40fwould be lost if the power were transmitted at 3000 V instead ofboalmi0 11 g0f4fuo9, lxo/bn 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 tran:s/miuk 2z 2wh /rsz*usmitted on a line with resistance of 0.60 W. To what vol:mu 2* zrsw ki2/s/zhutage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much enerussy:g*6) oxh gy is stored in the coil's magnetic g*hyu xs:6s)ofield?

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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 contain 84p 0ar2pnc) rotazs:s a 6.0-W resistor and an 18-H inductor. What is this circuit's time constapa 02t4os pr)r az:n8cnt?

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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 voltnta1doh;/jv. d h +p/tage 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 8-2 4r+2vwd upmymvkf 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 mhw6b+8w8gdi a 120-V AC outlet. What is the resistance of the lam h+m88gib w6wdp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak curre1 zv(cqq-gmg- :d9 mpent through the resistozd-ge1 p-mqqv gc(:m 9r?

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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-us(w 7/eu4 e;v auiu hvuob9d 6r:/qo*V ac power supply. What is the power dissiveau /si4*ouevo7 q/6;ru(9wud: b h upated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resa kbxj/k000 +ey6wl cbistor 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 vbu7 r aconice hbz7:)x./u6450-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor np+9-+zktm,4go4juwyp* zuc 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 inductor at 2z*,pmzm7dnvb sb 9vry6x((j 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 reactant- zkj40p9x aj4xm;+wx 5wgqjc y9gc7ce 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 coil have 14jk*urq x6c/z l*yz*2v. ho el..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 of inductive reactance at o33o l1;uxtv n xorm t)(wxo 3qobfivp-:j:(21000 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 A3:uz4.l3/gyg lfp8*y vo kc fjC at a frequency of 20 kHz is ap lzy/ y:3.o* 4uf8fggvcklj3pplied 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-mmhv co/ nb+)d/oxcx fr.x(,i(H 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 r (0 obzh.9fcx .ta3dubeactance 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 of capacitive reactance at 10 l9phcqpv4+x;bxrr:4 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 f(y4gr03id-ic( huwe/x7 j-on w*b vo10-mF capacitor 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 reactance7e() zqid w3mmkd; hh* +apqy/ of a 0.010-mF capacitor be 100 W;dehiyqqh+/ )mm(3k7*apw zd?

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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 0.0wmqma0g ck 8 kqq-8a7)010-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 vua 7jocg ok2h,h2x67 of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 106xkgu722 ohc ao7 hv,j.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 kzooc*.f / :wx1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sxz. :/oocf*kweries?

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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 ifws(-kz.n8qi i ( jpctvc6t6;x a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co;zsjx(tc k(iq6-pit.v c n6 8wnnected 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 conne0ort/cpqrf.d u ;v m7/cted in series with a 20-mH inductor, what is the impedance at 1000 Ht ;orqup/m rf7d/c v0.z?

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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 c zp3ot,n4d23gk v,ebkonnected in series with a 20-mH inductor, what is the phase angle at 100d 4zno,33bg2pek, ktv0 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-mFm9yzwr;6+ek jm:4h nr capacitor for a total ikj+6; zh9rn:emy4 rm wmpedance 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 capacitanc;7l:gq s hsgn cia7;a8sr1a )jes is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzi r sa;janlsaqcg17)gh 87;:s ?

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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 jp+ quicc8g .)5000 Hz for a total imped)c8 +juip g.cqance 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 + nm9/y gud (xf;jqmb 9n15vjtseries with a 100-kW resistor at 1.0-MHz for a total impedance of 1;tgq 9d jnjm/y9(n1m+ ub5vfx 50 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 connek(xrzr34)e 6 icu3pa ft2ud 2 v,sk3gzcted in series with a 20-mF capacitor. What is the impedancecxiud 3e3 z()g,63kaz4f2 tvsrpk2ru 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 u xitr652 ,etea 10-mF capacitor at 1.0 kHz for a total 6ti, 52retxeuimpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at :q:kpj zib6f hyk-qr37kk3a1t pr)c*8 ,h onz1.0 kHz for a phase an ,ko8r3hhncia)zkfkpjb tz-kq :3p r :*61yq7gle 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 sergq7m yx.9i4 akies with a 30-W resistor at 1.0 kHz for a total impedance of7kx4.aygq9m i 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 wit5:a19uli)w ohf):(mkem uqwy h a 100-mF capacitor at 120 Hz. What is the phase1owk9hfl ai: 5u yeq)m( )w:mu 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 if a 100-W resistor, 20-mH coil, and 1.ttrd1y8b30/se ;ky n4dz; n zj0-mF capaci 0z31; dt8ysnrenytk4j; dzb/tor 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 circuit5s4w qcf z; mj96a2 mxo4x s0fpxt7ho- consists of 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 cip smm25;f 4w90s-o 6x4axq7fc tzxhojrcuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an ind1xbh fmg..w 8luctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flo.w 1mhl.gx f8bws 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 containinr h6jl;a5 d ;4rr azz7rr+2dhag a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supp6azhdrrhd;za;l j4+ ra2r5 7rly?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phaszugqrs ) oro.3 9g/*xh)lau)gaxwb- *e angle of q-)*l)xa 3b)gauw. g o/hx*grrou9sz$40^{\circ}$ 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 =dvlmv- ,u; o;i 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dri-mo, ;ildv ;uvving 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 in0rapg hs59n w: an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive rrg5p09h a:wsneactance, 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 circuith-)74fq a -,7wy a xgxwv;djzt is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What iukbuk-g(o 4x+37 j trvs t3vtjb+-4k( gkuxr7ou he power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing ei*rkbgzl e:754. uvga 50-W resistor, a 10-mF capacitor, and a 0.4vu l g4i7erg e:z*5kb.5-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 capac .ctco(rwcgul8 7o )g*itor and a 15-mH coil in series?tr c . )(cow8g*gucl7o

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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 cav t(5y a9xhlxhwm1, 1rpacitor for a resonant frequenv,h19ml x( tahy5 wx1rcy of 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 needt.jt( v42w+ ,f h6gihjk9humoed in series with a 3.7-mH inductor for a resonant frequency of 1000 Hfg .ko(jhh +j9tu, vih4 6mwt2z?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor musd8 .f2y6 urzicqh7 g0tt be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 100rg0u286ih 7fc.ytz q d0 Hz?

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