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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 x /igaqnrkyhh:d,s07a: 9 0r.d8 b difflux 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 xllt1n7 ; 0pzc6e 4xzxstates 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 azl4.ybf)frm :zg fl *- coil produces what kind of change on the induc4lfb grmf:z.)fl *z -yed $emf$, 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 o-q2 -lyjxjtv os-.5bj f the magnetic field through a loop of wire produces what kind of change on the i.--2 yvbjx5 o-qjs ltjnduced $emf$, 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*v 2ganvuf7jz *r mqg2fp.1 o/oop of wire produces what kind of change on the inducfuj.vvgmf*12 2a7 or/zpn g*qed $emf$, 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 a85x z g.v7bo vcih-g:k magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a pxnf- *6ji(h2d(ehxgdr t +t(conductor will be that which tends to produce rf n t(i-(h(2gx dh6+txp ed*jwhich 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 hori1fl:l *4w6a 7hs4azi7x- lie(agpk orzontal table. A bar magnet is held above its centergalx4i7li1-frapslk7owae4z :( h6 * with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bahy jkd ka: i.e(jqo,*1r magnet is held above its centy1a :* qh(ojkekj, id.er with 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 table top in a region where thn+bklhx l+ ek.+5 s/rte magnetic field vector points straight up. The magnetic field vanisherhl x+ l/kkn.t5b+e+ss 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 tablej/r *)qy 92p5qml rngkz6g.s t top in a region where the magnetic field vector points straight up. The magnetic field sudde*rmn q9/pt2. gylrz jqg 6)k5snly grows stronger. When viewed from above, 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 in a region where the magnetic fie,+no e( 5*rbzoqz ifu5ld points straquo 5(*e,5 rz z+boifnight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carrieu*4o/duef.kc0 5 z fwps an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Wh0 *dku4. zcuw5ffo/epen 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 no04b(gzsj7i/emuhv n x* 3hx*lrth pole entering first. As the north pole enters v/s h0l*mxn7bi jhxe3(g* 4 uzthe 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 +l ;fu3i(b9qyjma6o za: z,niat constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field point; zal3(ynuz ab ioj6+:iq9fm,s 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 rotatedox5xz7l/l) m e at constant 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 loop's axis of rotation if the induco lem7x)zl5/ xed $emf$ 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.6gc jz)/lz:9 lmqn6 ba8q19ghue tb*k
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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 thecx-vswj11 y0at 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 field. Thekg a/c5-o fxw4 $emf$ 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 nortvf(c+ -fq doc8 8o.unshward at constant velocity through a magneticuccvn +d(8-qfo8s. f o 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 at a constante .y gkq 1e-gs6zy(,dvx3a3 2slv4wa:vh3h ge 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 generatorncjj q0nvaw mym.xx*;q :v ;;k6z/8.-xymabe transforms

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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 rev/o.onw. bvd t9olutions each second. The frequency of the/d.vo nw .otb9 $emf$ 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 usedo, xhp4u;0j.qkn2 u92weun/9azkg um 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 devibpszcre,0r/ r 3+r :ztcvh8;gce 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 seconduxw jdl*+4b w.ary coil contains more loops than the primary coil then it x4j.bw *wudl+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 contaq r3*qhdg.-*+l rywd rins more loops than the secondary coil then r +yrw3 d-*.rqhdq g*lit 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 powep v50x7a)spkv -4bl xpr 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 resona( zfrajn j;(d d1*8kwhnt 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 inductorz7mfhizhg (37 are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrosg3h77 (f ihzmzs 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 id)u4tg/zbkd u/etna 0 3eal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrossk z ba43)0 tt/u/gdune 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 inducta1 ygkfe;s pdon7p-;y- a5lr:xnce 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 with inductance L an7ql-o: aui 8dgd 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. The time 3 k. dxcax bb1vnb;u,9constant for the circuit rep., vkb3;ux xa9b1bdn cresents 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 inepbp-;8395.jd la ucj t.sjhy9p7 rbsductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents tphs.- sr5jya9.jb p;beculj3p 978dt he 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 m3f 3p *c u-3qgo0c4rym/m qrrsame units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, then-1 f(z7b vbigfu k97z 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 t ekr+9a n)0 sfix;in6zo an AC power supply. In this circuit, the currenknnz;i 0 iesa9f)x6 r+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 z3ap8,snbzs a6 5q3hi lj5 5ktac circuit changes by what factor when the frequen sqbkhjat355 zn iz 8p5,36salcy 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 ac 1m f/kepv:56tp wyp/p3mmk6g ross an inductor is doubled, the inductive rea6 1 ew3fvppgpkk5p /tm6mmy/ :ctance 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, txg3se ld s6u mrt+)98bhe inductive reactance of thd39gtx)+ubs8s e r ml6at coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this /k .wm xbyax93circuit, the currek/b.ywx39 amx nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancg5owrg-9-e;w8drh: zkmr 6 d xe in an ac circuit changes by what factor when the frequency is tr w8dg-;rkrxz mr5 9-6dweo :ghipled?

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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 r:x h:v981xl,dihkpqpvn* 9j cku19japproaches zero, the capacitive reactance 9j 9px:h* k9kvrluc,pnj q11ih8vdx : of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor b1s6qybo6f o1bnns7 / and capacitor in a RLC series ci61b7bosqn6s b n/fyo1rcuit?

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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 cirtxe*dnwc9-t- cuit 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 circujp kuv8x3da5 3it. The impedance of the circuit increases if R increases. When is this s35xk3d jvapu 8tatement 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 imf; abo / z35rx-zo6in8ssdht,pedance 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 seri/+r0 iejezwryxkq *x:*3ta 8mes circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both do rxm4incngn-1g /+tp0uble in an LRC series circuit, the resonant frequen txgcn/ 1 mg0pnn-r4+icy 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 driven by an AC applied voltage. At resonancl0z w,ne( )kvle,

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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 -jhvn22 u+b mv-rvg0owhen

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field ofl 9+9,.e ovpseqh-(o(1sm9ypsnele a 0.20 T. Find the magnetic flux through the loop when th pol e 99(e.pesv+ams1yq,-nshoel (9e plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fiel 4 r6jzoq(h 2ru sys6ef 0f*cpxpq908wd of 0.20 T. Find the magnetic flux through the loop when the plane of the lorqffy 06pz8qj6 0 u 4rwch(* e2os9xspop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fio( c47g(hj4yw-k izkreld of 0.20 T. Find the magnetic flux through t7-cz ghowjk( rky4 4(ihe 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 nd35 wtqqmr 86ryig y-;cl/ 6cadjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil cj;at ar,zth8+hm r8)m cf*()1 cd sgsyhanges 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 wit. gzmsqy) zopy8d9n5f8 7 dkio0 +de:ph 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied pni58ko:.mo e7 ydpyd9z8s )g0f+zdqp erpendicular 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 an area ohcgxu 5ub7(.cf $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area n6a 0/nrpp d-6:tzbf1c 9 mwvbu71aho$0.20 \; m^{2}$ 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 location wqap :k*hh :9is-21 kr wgdr+o uul9h3shere the downward component of the Earth's magnetic dsphuk 2 :s+i 3horr 9k:gah*9w1u -qlfield 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 angular vmlf;)tx jz /c*6 deoj 3y:yim2t0iwv*elocity of 2.0 rad/s about a vertical axis through one of its ends whilly3c/*o i)6twmid 20ve:t y;xfj* mzje 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 loof 7xl6 5cnxpkr0-art (ps 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 e yoo4ldl8w ms5s89, vturns 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 armature. E rbfs n e5533j0axlf;cach loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is pcx0s5a;ffe5 j rlbn 33erpendicular 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 wire of areakafbxi /.oe- 9 $0.090 \; m^{2}$ 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 avg jk) t5*wzc5 simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avac jk5)vg*zt w5ilable. 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 geh91i , mi8sfzqnerator with a 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 resistance 85 qfja- vq ub/qcc8l;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 motocnr+(d m/1) hoj p*bt*lt+rch r have a resistance of 6.00 W. The motor operates on 120 V AC, andd m*h1c tp*b+ r( j+orcnlht)/ 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 iog t omu(se0490m+p xps connected to a 24-V power supply. The os o+p(o emmp4x 90gtu0perating 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 resistan75ri7oo.-* kf ze:gdrrl-g 1hevk f,gce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bavgke-h od: 1k7 lig ,f7er- zr*gof5.rck $emf$ 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 pom8uar7 9g*/drk ysz :awer supply. The operating :rgysz 8ak/ r9adm*7u 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 transforpa5 khk60f2mi mer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn pr)c;z(fa:wgi u*l nlf 8imary of a transformer causes 14 A to flow in the secondary. How many turns areil;g cf w) 8zu:af(l*n in the 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, how0qz8dq6 zdm2r+rr8 l fj jvjwf./;+qv many turns are necessary in a 110-V primary if the 24-V secondary has 100 qr mjz +/f2fd;+88. r djvzwj6qv r0qlturns?

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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 a5b3i zgsrgf/a3* ib1 b 500-turn primary coil and a 2000-turn secondary coil. If the current in thegaz/f s5 bigb1br3*i 3 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 of a transformer. Assuming 100% efficiencyyb69dojl ki4fjo1-r z:v*o j: , how many amps ao6: yko-lb1vjjjd9z: io *rf4t 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 provide d vgug r i 1ggew8z)l)kgp1 6(/ihym)l7bnj6.s 7500 V at 10.0 mA. The primary coil y6 (l/68i pw) zgd7 r.jgbl)nvki)heg m 1gug1operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its s+7v twrq 2l/qpecondary coil. If 120 V at 2.0 A is applied to th/q7vl2 tprq+ we 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 primary c0qu(40pj k 0nqk7bux1 kmz d;yoil and 300 turns on its secondary coil. If 120 V at 2.0 uky uz71q pkmnx4jqk(; d00 0bA is applied 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 100 turns and its secondary has 200 tk1 7hb n**p6js*i +tnnfo htm *eln-4hurns. If the input current at the primary is 100 A, we can expect the output curkhl+n7th*nn 6joi4t* sb pm1n* eh*-frent 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 imva2lc q75v*f ts secondary has 200 turns. If the input voltage to the primary is 100 V, we can 7c5*mqfl2vavexpect 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 tz frzwsq+:q65/e:;c,ov9p jtu l2bmp urns. If the power input to the primary is 100 W, we can expect the power outpuf ztu,c6wp/q2 bsz59lp o; er:+j:qmvt 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 k 9l o5k0jsxe;current at 120 V. The voltage is usually stepped up to 4500 V by;sklxjo 05e9k 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 1rkc j.mxv9r4pmel9 t:(y q3+o20 V. The voltage is usually stepped up to 4500 V by ax9o3 (r +ck:qvymlm tjpe9r4. transformer and transmitted through 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 120 V. The voltage is usuxc(e; ki8w;wxg a l//cally 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 e;(/lcx/gkwcx w; i8a is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gen)y/gv10 h)fxiv8a 6m5xme6 y2 zazc lyerator 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 hy gf /x6zealim 6v)vm2y81xyacz0 5) 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 toteets es (5bsd32giu. +al resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost+.23gs5ese bsi (ue dt 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 leskw 8-/7x 4gkz1p tpmdns power would be lost if the power we/ k817nktpmdgx 4zw -pre 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 tradvk1lucyv pl; :q :/ 4enzt e2)7m9 3blzxrxd/nsmitted on a line with resistance of 0.60 W. To what voltage must the generator out 2rdlk9l )b v tz/y :nldcvpme4x/q x:1u7ze;3put 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 energy is stored in nm w 0fk+o4 0tyzk4f+o*.q drithe coil's mtdnkq04+4*0omyr k . zwfof i+agnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H induc9w7ee+jqp 6 a5tu:sa*tdmrn /tor. What is this circuit's time cons 9ue:j*at te/na6rd s5m+ qw7ptant?

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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 aug2 b8 hc 82m6iuxm)zbn AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the. m+6 npqxjrm 1+tqjw2 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 120teg./4niu ygdc/ /z/j-V AC outlet. What is the resistance of the lamj/u4et. n /g/dzyi cg/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 ooh 5f)a jq+v4the peak current through the resistor? f+v4a5qjh)oo

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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 t gp r8omha,bfxu0 i33 uvx(9q0o a 120-V ac power supply. What is the power dissipated in the resv,8 0hf bxr(xmp oiu a3gqu309istor?

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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 5k-; qf/:lfnzb 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 resistw42hf ld3o;9/9 kmhyf/t vo ldor 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 ia s)vxpewl-op o*v* of5 04siib4 1s5zs $I = 0.80 \sin (240 t)$. 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 reactanceng3rk; zuoz5vxdb 1d+7*1q j3yin-7y jem6pw of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2sbsdcb330yi 1 pu1y;t.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-mHt.;yd 1 vf*lfejy zw4( coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of in;l ytnt,f ,wk-ductive 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 :ujv65i *nm hm y5tqbv;xr/s r/r,7y y120 V AC at a frequency of 20 kHz is applied to itxy y*/h56 r,v urtb:7rmni;qj/ys v5 m?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-Va.wre fo)l yj. mg(..f, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kH3e , ;s:o dfrsvnojl:0qrag17z?

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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 reactancep fthgw9k/+zc 2+b p)n 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 12 nxa/z c0bl hd/73+rjb6tb b6h00 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 capacijjf)ku akg:-8jpv3 : stive reactance of a 0.010-mF capacitor be 100 Wj 38pk )gsjuafk::jv- ?

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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 0.5b .e+ix57 ik82p do 5ylrxp jxz1lf2d0010-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 aawf;nyi6 g8 hn)n;mg.c series circuit with 12.0 W resistance, 15.0 W ind) nina ;n;y6 g8w.gmfhuctive reactance, 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 resisto 0 wth.4c7 3xd)anfdxur, 20-mH coil, and 1.0-mF capacitor are cohdxut7 cfd)4wx30a n.nnected 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 xujrbwx :wcy::uv o5y8f)weo oa4*90at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri)v8:uxyj: *wcr:fuyb04xa ooow9we5 es?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH iniss lm ib/g/,j:;od7 qductor, what is the i/iqs i:o 7jd,s b;m/lgmpedance 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 inductor, j*s3* bwxhic+ what is the phase anhs c +*wi*3xbjgle 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 o8f eulykq6f8nr4 7x *20-mH coil and 1.0-mF capacitor for a total impedance of 100 W 7f * 6reyo8xlqnuf48kat 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 capacitank p842j,(ih gy6 ytvhbces is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of p8yht k(hj4gi, b2y v6110 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 for a to0 1kjo bcn1 41 -8v,sarrkxzzotal impedanccs 1z0,kxjo1obnvr-8rk1 a z4 e 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 se)(pwqqa a cd,-ries with a 100-kW resistor at 1.0-MHz for a total impedance of,c q-a wp)qd(a 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-mF capacitor. eg;26kpltr7a ,r +fgi(mts ;e What is the impedance at 10;f6rg, ilkge ;p+7stat(2re m00 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-z io90cnybh1zr1 5e2tmF capacitor at 1.0 kHz for a total im5y1o9rtn z01izhceb 2 pedance 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 1b2rd 0zlim()syn9 jl6 (ej*yq .0 kHz for a phasein2l 9d0q(bsy)jm( *zer y jl6 angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.x (fvsc;s /epb60fj;gcj;(e/r ip v w(0 kHz for a total imped;(jvexf b/e0vrfgjwi ss(c6; (p /p;cance 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 wit ze6, g)ngzp-bpy c1y5h a 100-mF capacitor at 120 Hz. What is the phase angle?z yy cpgnz-5pg16,e)b

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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 13vm5 0bk 2v+dkq,xzj 5awb/qb 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected zv+3 ,m0 kj5b2q wxv/bbkqad5in 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, a 10.0-mF capacitor, sr8fb i 0ss/vr ef(mv 8ed)o.(and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cue.88 fs/()rsvofrv i mb0sd (errent 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/olu6(k*fn qy 9su aj5 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What *ly ok9/f(a5 qsuun 6jcurrent 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 g m8v.+gjd6, 0sl sbqjcircuit containing a 50-W resistor, a 10-mF capaci 0ljbjss .8q+v6mgdg, tor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in se0:s;(ho)u3 b-ob zf fash/ ahiug x0j9ries with a 500-W resistor for a phase angle os;ioubu0:xsz 9h / o3 a -)jh(f0gfabhf $40^{\circ}$ 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 ez- ai;t83tc dhas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tra3tc;dt8 ea i-znsferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0hkd 2x i5x-(zabk;)c*ev znj9 W inductive reactance, and 10.0 W capacitive reactance, when thd9(h 2kx ea)kbxcz;i z5-v j*ne 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 f0i+ ry+yym6g,ws y9 gAC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a*p)n jowe(+ftnu; u1k resistance of 30 W. What is the power factu o1tj);+w kn*fepn(uor?

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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 a 50-W/ c*skfm i zp9p38rlbb *;ig1k resistor, a 10-mF capacitor, and a 0.45-H inducczfi9*kbb/p3*ril;p 1gs k8 m tor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in s.u1zorn y6jelhdpjyo9mu. g4bc .i 140hk b46eries? lb 9g1honz1d .bj4uo.yrj u644c hi0.6kemyp

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needes v(r b,vv8cx-q 50aaud in series with a 4.7-mF capacitor for a resonant frequency ov5,( xra8-u acsvv0 qbf 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3m w,t6a 5uysj,w6u+g f.7-mH inductor for a resonant frequenugumsa5f, w y+6w,jt6 cy 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 serizid)wq a3 (;yomvv8hoe91py f*8n 3 rhes with a 30-W resistor and a 40-mH coil if the resonanthf 3mdvypo iy8r*8evz (o;nw 19q) a3h frequency of the circuit is to be 1000 Hz?

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