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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excepj(xgt ;yrj petc epw6e,dk r9.y;s;97t

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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 ind vwgzw)b9a3 a*+pudg)nb3 q 0puction 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 cow5 yh8mxp-iby :p0k1z8xm9o/ v ql xy5il produces what kind of change on the i5-b50/zh o89yxpyk:lwmi y1m vxxq 8pnduced $emf$, 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 throue:3 )icai5pf6c oxvd 2gh a loop of wire produces what kind ofp eoaidv35i:)6cf2x c change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wi5.-c+ lnvu :lg -bwit*d: ybicre produces what kind of change on the induced -clyv:5ldn: u .+b i*gc b-wti$emf$, 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 magnetido4p d)ikfk,zg k*9/ac field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced curre haf/w4t.cp3pxur*qtjv5/7orsd ; .int in a conductor will be that which tends to produce which of the following ehtapt/iu r.57; fdoxpr3js4/w *vc.qffects?

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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 ms v2 ca pu,i:abs.gj63g9c zs,i- d5bjagnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abovez6:c3bsj.2 gsv5j,g ci, saida b- u9p)

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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 ekly id4-yyp7p/3rdu .mz5g3is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed froyu3 y3m.iy5/4-zr d dpg7 elkpm 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 ta p(* 2iiugz xk,9.hzytble top in a region where the magnetic field vector points 9i*zxy.2( h utgz ,pikstraight up. The magnetic field vanishes suddenly. 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 table +l gpev6 n-p8/0cgnd+tg q vy)pop,j4 top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from abov8 gop-n vpep ,yvdt nl/g+q 0+)cgp46je, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top y0mrn7vr50hym9pju+ in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currm9+ 0 mr7yr0hjp5uvyn ent in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal t 2-s2 s m4c (k6xbjthe2zzmsh:able and carries an ever-increasing current northward. Two 6zs -2t2smhbhk z4j( :xs2c emcoils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north(u4ubwg;;h) iybtmc5 pole entering first. As the north pole enters the wire, the induced current will yt)b w(u4;5m chi ugb;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 at9z8ovxp)e qk p8ab t4lw 13k3h constant angular speed about an axis whose direction can be varied. In a regiopt 91a)qx3ke84 kwp8 z volh3bn 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 rto/ea3b-f. r.sp 0umq otated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dow/q-3fembs.pra o.t u 0n, 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. jqjf2 bl.:1qc
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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 thk2 c0jd3s o9 axs+ *:umed7cmmat 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 j g 5u,moecyig 8*) ih6strd-3field. 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 moved1wp9cjy4 s6zv2j,hue northward at constant velocity through a magnetic field that points straight 1j,jep cz y69uvw h24sdown. 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 bru4e6hvol jm(k( 7*0noih,jy djyi7 .ar rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trmf uocdh7k +4 )nzu)w0ansforms

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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 re(3j3kw bu;7.c wu-xmx) rphs fvolutions each second. The frequency of the;x(mph-w ) b.j 7f3 cuxuk3rws $emf$ 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 used t.wz p (.sl.euko

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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 devicem1 uyicfv y9 384,hesb 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 than ez b.+uqxd8 a9the primary coi a+bu8e.z9dqxl 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 pr73.dsb;ul 9: bbrdf z(ra sg.dimary coil contains more loops than the secondary coil then it 73abb (rsg:;zub.rsd. 9ddflis 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 fvz4hino 1-:upower 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 (:qbrsm/ hh)is hv):ocircuit,

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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 x8l *e) nx w(vt+hn5tzare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batte wvl8( nhtxz5nt+)xe* ry, 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 con4ib:.ri8olb- lhewuu w j p1a7b3t.-uy9rih, stant terminal voltage. At the moment contact is made with the battery, the voltage across thu .elj1t-uyih.w9oiahri ,: wbl 3p-u8 rbb74e 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 induc0r (gj*qcj4m zbc 1x3htance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit wi )xfxf-9axxyzuy* v(8th inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. wf ,g, n(wqkbd//c6 4jyeckp ( The time constant for the cir/ke ,cp4fyndb (/ gwc (jq,w6kcuit 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 a battery. The batt dfx :vqzelk7:iy73gfvwe+u2d7z3 - very is suddenly removed from the circu-3:77i u+ yz w:le37gvfkevx q vfd2dzit. 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 same units exb0kpg oi (/g170k4p5qbe)0tls ut xe ecept:

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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,1vu*u,cex n1g 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 thisa+c+dl4emd 8mo49m lksv qk06 t swhu55)ex:h circuit, the currenh m658 wu4q:kl+9o+emsxhdd e5la m k)04vtcs 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 cirlg(vpwz6-p0s cuit changes by what factor when the frequency0zp w(gl s6vp- is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, t.0oqht no6v )9fbs-p dhe inductive reactanvt6 .d9h0)nqp- foosb ce 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 b z96t3betz; 6vyzg4ninductor approaches zero, the inductive reactance of that co6e9 vtbn6z z3b gt4z;yil

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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 tx gsc28qor uh;w9y(b65 4sjd po an AC power supply. In this circuit, the current sjxubp68hdr2o49g qy (swc ;5

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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 circu k ge6iz yw,nj-.bm(;wit changes by what factor when the frequenkmw( g eyj,wz.6b;-incy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches z ao u;mi+p94irero, the capacitive reactance of that capacitoro r49p +u;aimi

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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 the inductor and capacitor in a x+z-(i+gm v tmr:no*c xtr++g n:m( o*iv z-cmRLC series 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 ae:8 ah u:kkvz4n 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. T:l4hga o e5 q-nq/-pptl t:a/vhe impedance of the circuit increases if R increases. Whta/t 5pl - qv/4 pqa:-oneh:glen 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 of4dyhke.crwgf (0(i j0fh7 am( 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 cir3 p.sqjfbap 1 s)(u(zrcuit 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 capacitancem,u5ys-jwmu.rj 0;j juo(m n) both double in an LRC series circuit, the resonant frequency of that c j-j0 (r w.;m5yojsuujm nmu,)ircuit 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 driven by an AC applied voltage. At resonakpzai9g) tux;q +r*1aq,p9v v nce,

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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 2c;a/wxbh .h ;gjy8d tcircuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m if ,,hhr ))+bp0)ckmw*dwip rps rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop ,, idf)r )hkmcpw0w*p+)rphb 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 jjd0s606z vj.6jbf hm uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and 66s fzjvd0 hjjmb 0j.6the 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 rotsj4vrn /t 4a*ozc;8 zoating in a uniform magnetic field of 0.20 T. Find the magnetz nov 8;4rjo*ct/ z4asic flux through the loop when the plane of the 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 single loop is reduced fr7b5hg1 0 xsmrpom $1.0 \; m^{2}$ 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 changesbpgbp(m zsdo, klor7 :6)z(1 f from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cunbaa20,a/ryu pj f7 8m. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniu7b8p ,jn ray 0aauf2/formly 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 an(jy,nj ge.9if 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 arevx *hbp(eq w()a $0.20 \; m^{2}$ 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 horizontally at a locationr0zms 7p8kn6 f where the downward componenp8n7 m6k rsf0zt of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long ro9 bg xu2t1rq4atates at a constant angular velocity of 2.0 rad/s about a vertical axis t1 b9gu4t xrq2ahrough 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-sectional area of z)xsfiio pp3t-;8 cj )1wbyvck7l2 o3$0.25 \; m^{2}$. 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 consistma af /*vg, ab/td;abght:7ou iw14 t*s 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 rectangular loops on its armatur*w al igya8(,gr..tws e. Each loop is 12 cm long and 8 cm wide. The armlyggt, a*8i w(ra .sw.ature 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 heat5-n-2 cdm 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 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 cosi5(* ny f6g9*j24:xzwe yx:q cyvm llnstruct a simple AC generator with an output of 12 V maximum when rota mszc xg4:xvfljw2yn:l 6 *eiyy(59*qted 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 8 q2vhoi0g0xsvqo*r + maximum $emf$ 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 rev e+5yq+k ot6bsistance 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 h2wd gq,( hhua01 0lzda resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it 1ldz0u(,2 a0 ghw dqhhgenerates 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 cono +b 9pyjr: 72fr0blhdnected to a 24-V power supply. The opera h2yf0l9jbr rbp:od7+ ting 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 conne-( b)r 0xm;kf :uh;+orkucswk cted to a 24-V power supply. The operating current is-mcu:uhkkr ;0wo +f;bs kr x() 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Thw6+mo 8:cmvfn;n(es8k( jm)he fd5 uhe operating current is 1.0 A at full speed. What is the back 6(sjf8m+n8 w h )fvdeo:( c5en;kummh$emf$ 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 e0 igr nd.9+ s,kx5vgl6s6gpa 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 transfort-pyl ,6z0927ti d,tu:apy jpbvk /iomer causes 14 A to flow in the secondary. How many turns are in thi0p-/va 9bt, 7:jdy6lkzop ,2py itut e 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+aw c:m*0aze 9p;3xcda x1 wrs necessary in a 110-V primary if the 24-V secondarye*xwr3;az s:c 9cxw d01map+ a 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 jw t(,6dg 1wcou *ts/ca 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in th* gtc1 d/ju(6,cowstwe primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumion))itwq:0i b y/,): sgscqanng 100% efficiency, how many as/a,iciq:by:s ))t)g nn w0o qmps 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 provides 7500 V at 10.0 mA. Th-ssii 4o bojp7;vo. 7qe primary coil operates on 120 V. What does the pbso 7oiisjv -o;4q7. 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 turlos;vm:hvk) m( 6.lx dns on its secondary coil. If 1m(:sodv6h lm l)v;. kx20 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primar sm ze9)kbm0v 1o hhq+28fyle7y coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current 70oy esbe9qz 1h2)+h vk8mlmfis 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 ajddce ny/ w477 f7:ascnd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curcw7/:7 yn7jdcs4 d faerent 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 and3 bs7l yb:b5iv9/ozm7 gqk:vxa6 lte5 its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volta9oby5: e:5iv6l7agksv3z txb7ql/ m bge 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 t/:fn uk;wm.kgok ij*qu, :v+qox6hg 4urns. If the pow.uvm 4:gk*jokow, g 6:f;i +/kxu nqhqer input to the 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. Thie: fwqlku1q*.yw;4xz a7 g+de voltage is usually stepped up to 4500 V by a transformer a f+iql guy.x 4: *qdw71waezk;nd 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 3 pwsj vud x30xhb4l(.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 jb 3x3(hpsdl.xu4 0vw 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(mnbqt,as9fz5 i(e:ewnzo o 0m 2b7.j 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 ijn:.o en2qbas w o,z(t z5 b9e(70mmfif the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km luf6 3k9bq5zaybgy 07bong has a total resistance of 0.60 W. A generator ybq76yk0b zg5 9fa3buproduces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A guaa 3 uml8 xxm)d-pdho g(:x 0e)yd*c0enerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost -dm dax:*d0a o0cxu)8humy(ep 3 l)gxwhen 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 muctl7rlh) 2ycz :h less power would be lost if the power weh t:2z) 7rlyclre transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted o b: 7 spl9in:/l c7-q0eey vmb7trjj6in a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if ther9lis - by:jveq6j0l 7bntc/ip77me : 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 energy is s nurk4 a n5o3ays6rd8ar5;r. j)jo1pitored in the coil's magnetica .oi5 jnprrra3y1k;8djo6a4r us5n) field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit c7t: ql4 g (hjq,gv(4bt lzepa*fo(qt/ ontains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constah*f qa4ozj 4 te7,t( : bl(/p(tvqqgglnt?

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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 voltage is 120 V(ic xcji-)( ho?

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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 1am,qn5 00 pejx20-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 a 1207dx gdq -.+px*n21so10aw;chsgd c md-V AC outlet. What is the resistance of the lapodsxmdg .q2 +wc-n07*; sdhd1 1gxacmp?

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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 a6z5kwtv s i; (/km-whe 120-V ac power supply. What is the peak currev-6zs(;k/t mwiw hke 5nt through 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 connected to a 120-V ac powere*xjbd3. vm*q hke9w; supply. What is the power dissipated in3jhkmed.v* *x qe 9;bw 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-Wvrt.pbtep. *u (g u.shly .7p6 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 ia wvpb wppxcx75i45ps2+ (q2as $I = 0.80 \sin (240 t)$. 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 resisrkbqzqdo 97 (.tor 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-w x0-ov n3jl+2j)rwq*wc r 7+csx mak.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 100jg-lavje3 zj k:wvysq+4rts6v06 ) 6u0 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 hav es5 j mk ,qovnni d. 1qxy/::r58fa+k5b(lkdee 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+yvcdi t1 )fhbbc6r; 9i)uy- q 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 iu.l yxt9. viu5g9j(fk n a 60-mH inductor when 120 V AC at a frequency of 20 kHz is 5iy fku9..( jglt9uxvapplied 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-mH coil due d-t2gq v0,lqp(n/h*im4cvep to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mFq6l8, 0ws(bip iidt(b 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 r);syo -csqr vj0:qox(eactance 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 o)h rx,xar6phaiw7.q) i t+ lv2f 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 capaci9 :d:sffv +yby.ijj 0ative reactance of a 0.010-mF capacitor be 100 Wj:id af vby.j+sy:f90?

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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 322u b:ny)tv x1x kljg0.0010-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 circ*gyok f2j2yd u3l -,gmuit with 12.0 W resistance, 15.0 W inductive reactance, and d yk-gymgjl22u*f3 o, 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 15b( tx.ie kk1,/kvr, a :8*3zojghldua00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF v8i/1(,kza3 ae.rj kkotgulhb , x d:*capacitor are 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, 20j3q /tyag:i2 h-mH coil, and 1.0-mF capacigai3 :/t hqjy2tor are connected 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 connecxjw1bf/ m6 xd98do7xuted in series with a 20-mH inductor, what is the impedance aw6mx uob/x jd79df8 1xt 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 inc g -dli zjw3)w.x :8avhqax*8 series with a 20-mH inductor, what is the phase angle at 1000 H:- x* 8.izawdac)h8ljxw3gvqz?

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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 a fedhg: g56b.fjjsk(v l49vt r40 ru .0eeh*psnd 1.0-mF capacitor for avg.4r e*k:4j psejthrl.9besu g h6f0 vf(d50 total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in serl ej72erldrsnb7za.lmf +p1 (p :2ba 6ies with a 100-W resistor and 15-mH c lprez 6jl +empb1nbf(dl7sa2 .r27:a oil 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 serkimm:: n6tpy 2ies with a 450-mH inductor at 5000 Hz for a total impedance of 40006 ymn t2:im:kp0 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 100p*ib(w 4 nrcbc22 i1tr-kW resistor at 1.0-MHz for a tota4 (crb2it2p1 ibnwr*cl impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mmedofd4b k537zhhd+;;t 4x bnF capacitor. What is the impedance at;e m kd4hn4dt+;5d7 h3xobz fb 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 capacitk dz ,si9szb;e9a/b6twetdq++ n7o1 por at 1.0 kHz for a total impeda;bzs9 ,oib na1/ 6p++e9 7 dtdsqwetzknce 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 ne ,o)umszeyk-p,me.o , 9:l brgeded in series with a 10-mF capacitor at 1.0 kHz for a phase -sp l,uebyr o mo9m:,)k.,gzeangle 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 r95 umlekzttk/f:1 2b hesistor at 1.0 kHz for a total impedance of k/tk1b luzf5hm:92et 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 yj 36ndcwlgo )bs v *(,5wel*n120 Hz. What is the pha 5) ogl(*bn,d6eycs 3v*jlwwnse 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 utz /klq8c q7+coil, and 1.0-mF capacitor are connected in ser8+ qtcl7zk u/qies?

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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-zwe qiip-7.8yo *3 kmkW resistor, a 10.0-mF capacitor, and a 0.3*.q8i ykez i wp3k7o-m50-H inductor. The circuit is connected to a 120-V, 60-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 an inducaln1) ycgq :,fb:n 8owtor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz 1f :b8o,l :qgwancn)ypower 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 cipn :cn0ip7 lfo,r d i(bomzr:6o5n3c+rcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conneniif:+3ocd: zpnbo 07 rc lm(on6, rp5cted 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 series with a 500-W resis g0dgsp( ln.t(ilqc 1v 6c8j/mtor for a phase angle of p(1 8 6(ciqctg ldl0m svgj.n/$40^{\circ}$ 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 frequenc)u1rcgs ml5e*,2ocx.a yxtv ,y should the ctcovsx .5axm,l 1*uy, eg2) crircuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circui) dcxtg/1 iym6t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W1 6 ctm/dg)iyx 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 circs8 4)pt8gfewjuit 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 isn./*al,wl dhlu*4l+cd g z- 0*mtqd hc the power dzdlc*,ldu0wh qg *cln+4am-h.*l/t 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 cj 84v38x,:li .r ydbw xm.4f/vc/f imjc -mnveontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to3m,w:8bc.myfvx8d/j4.ii -lfjr x c /ev4mnv 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-ml/l,(dp1oyp 3y, i,ygrdw-uw H coil in series?d/d (,ry poi, u,gw3y ll1w-py

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needplw vt( u:ld(8hu6;cfed in series with a 4.7-mF capacitor for a resonant frequency of 10 kHu tul8lwdc:vh;p6 ((f z?

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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 serie huz+ v71:(exbnm5zgsed .yh 3s with a 3.7-mH inductor for a resonant frequenc+um73eg n:(d h v1yebsz z5x.hy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in sp so-; )pnfugl d,j xj2,6j l tbshkim-2//kc(eries with a 30-W resistor and a 40-mH coil if the resonant frequency unj kfpp-2di j o/,(bcms )tj/ lx-,2sg6hk;lof the circuit is to be 1000 Hz?

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