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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 ma)x13vz.:lsfc gtl;djgnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thatg1hq -z6x.wg x)uv)o h the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chi0+8p-t fswlv baw47xange on the indf 40piba 8ltvwxsw+ -7uced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loo0hnc5d c*lo.pp of wire produces what kind of chadoc l n5pc*h0.nge 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 w* xcus hk5(2ji *m1oriire produces what kind of change on the induc om(r5 is2c *u1ixjh*ked $emf$, 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 fiel (qlwu. ,pf6wnd 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 alr0j/ txz+.o(4name8 oxqe4a)x3x vb conductor will be that which tenj0 ma3xq.xenvar/ lte )oobxz4x84(+ds to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a ho7e9iaz 87f ee:avyz;drizontal table. A bar magnet is held above its center w;8eaif 7 ezz9a:yvde7 ith 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 bar magnet oznx2*9 ;cfjqis held above its center with its north pole pointing down, and released. As it approaches the coil, the fallionz*j2cxq f; 9ng magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the m*bc zykak(az 8 r-*qr5.eyd t/ +t:ikwagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as tkd:ti r/tzck5y .+r k b*e y*w-q8aa(zhe field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in an7l;aot-wcqhpxi38eo e c 5*- region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases*-7pqc x-h n eel;oc 3o5ia8wt?

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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 t+1bum-:(+gh dpgyj bthe magnetic field points straight down. Thg-btjm(ygub p h++ :d1e 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 horizont0 cqk04ixwc fu s1s;s*al table and carries an ever-increasing current n1xs4*sqicwu;fks0c 0 orthward. Two coils 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)f6 er) ; rdl blgbghdkhs.201 pole entering first. As the nor ke) d;gb hd)ls.b6 2f01lhgrrth 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 constant angular speed aboufpfpt0t9 :m-jt an axis whose direction can be varied. 0f ptm:9-pfjtIn 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 wiw5g*d/l4n fnhre is rotated at constant angular speed about an axis whose direction can be varied.l* n/4dh fwng5 In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law./r qtemz - y- -wrtsy--m-)ivt
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that :a zg8 ;dlyk c1 ( aui l036osvik:o3qzm6uaw,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 ma;tj ,, d2xezhtgnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in thtoevmy1) 3w0;mt h+*ijn7cfb0 k 7rsre east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acr* eoj sfr h tnmt03vkm+w7ry7 ic;0)b1oss 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 cai7ghdg aer :5m s+h12onstant 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 tra :i4 n6lty8vg:n ap;aqnsforms

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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 throu8yp wednq(hx* 70hr. p0rqny:gh 60 revolutions each second. The frequency of tqnx0dr8 hnw h*q ey70prp(.:yhe $emf$ 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.fvg/ w-ubm8 sevice 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 devicvqpl2nw o7l a .me(gjb (m90q7e 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 se kp0snn )d8h.9z:jabw:r x)kqcondary coil contains more loops than the primary coil then it p0 r)ndz).kbwja: qnx89khs :is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secon hh0z65,naijdu jc* 5b a6hjf:dary coili *6n6jd j5zhu ,c 5ah:fhjb0a then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpu-x7b w sig) rpk/0lan4wujwjl0,xj1 +t

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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 resonantnlj3++1nu mi fqpj1k*ho 7r l) circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series t*1 oslhssk)m* o an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the r*s) s1msl* ohkesistor 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 inductwwf 6, p+yw5b1m49asmj h+cdwor are connected in series to an ideal battery of constant terminal voltayj9chww15wpf4 s++6bmwa, m d ge. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with*2i :tnv1mr lh 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 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 ut;o2iip9 o; oR 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. Tt6.q /ib, nmnmhe time constant for the circuit repres, t.i/ qnmnmb6ents 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 g6hjwt :tk:l3 azjrcl 62u**t battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required foat6*r6zkht:gutjl 2:* l3 jw cr 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 exce 3b uvps3a)6axpt:

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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, sn;vwf:f - v1 p7h w/8;qyjex,dr8wwz w3wue; 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 powechke:b(6 ejz4r supply. In this circuit, the currenth j cb(e:e6kz4

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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 na.ej *qalz5yfr-.+ vfudv05what factor when the frequencn0+je r. .5al*v-fdfqzv5uy ay 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:c cz17zi k6 4ertlh1gr k1.mi is doubled, the inductive reactance of :zr ec 1m46 17klzi1tgc.ihr kthat 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 voltaglycfc2.;x u*o(z s8 zee across an inductor approaches zero, the inductive reactance of that cx8fz ezysu 2lc;.(c*ooil

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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 circ1vupat+t ;awfj vi49 5uit, the curreip 9;uttwf 1a avj45+vnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the fre6d 8,xn+ko x0 m fa0mhvplvle sw+7h,6que vle+ds,+k0 0oanxlhwhm6f pmx68v,7 ncy 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 zero, the capa/.eyj,h0 xc2-py scac citive rx,./0pjs2yah - ccy eceactance 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 ang;r,xl h d g* lyhtrr9l7spk(,4le between the voltages of the inductor and capacitor in a RLC (h kdplrr *7tg4 l;,s9xh,rylseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circug ecz1 r (ati2(yow::uit 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. Thy5l7:xh*qxr( o d vy3ae impedance of the circuit increases if R increases. When7y:yh r*dxq3oxa( lv5 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 im -fk.y0 tgj)gh glz7,kpedance 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 injnn o3oo4 de6: ;i; sz1h7kcdtcreases 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 angs j2v)h8 .empd the capacitance both double in an LRC series circuit, the resonant frm.e)hpvs j g82equency 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 drk nnynxks:7(x :w7k4biven 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 hms k0 dll1qrfw)6j(2occurs 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 0.1yfhq0o+t+ zp 6k,u/ -bk*xnbq0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lop,on-++ kkfu0qq /t bb h6y*xzop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.u2/oeh0k da fjwl26( i5ana z/pj :n5l20 T. Findjfnaj2/652ip e( kowa undal:0z/5l h the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform ma24js(x ,kjh g:grm-bn gnetic field of 0.20 T. Find the magnetic flux through the loop whghjgx42k,n rs- mbj(: en 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 areaqo2sepw+.nkx c- lfu7+,iv; d of an adjustable 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 c0 i ql/ep8k*vz1urs,vhanges 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 squ0ucm m8(hn4c1ul. bkfare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fiu c4c. 0lnu(8fmmbh 1keld 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.a,(hs rwcl)z,v. erj 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 arq3lj smnt) 7z:gpj):gea $0.20 \; m^{2}$ 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 aq* 6 pzr .l +sc.bt;i:4 dghv*fhvs,ab location where the downward cod * h .pz 4b+t,svs h6l*rvg:ai.bcqf;mponent 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*kti3oos+ 1yl long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis il oytk 1o+s*3through 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 haskmhlh ,vm 0 u(ci,tm9.+f nm6i 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of p27om-p /;pssrxq,fyarea $0.090 \; m^{2}$ 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 i9u o gm88bmr4kts armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnek gub8m8 9mo4rtic 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 wire of ared33z9/xc *k:m6mc*i hmx zje ia $0.090 \; m^{2}$ 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 simplb6f p+y7fk+f0 fag-nde AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T isb76f fd 0+yn+kaf-f gp 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 wip7lxrsfuxoo e 585v( 2th 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 aqn6,rvh 2d7 zs 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 resv5c: (si 1qqoi o.0acoistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it (vsoc5c0 . q1ia:oo iqgenerates 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 issl03yk zst:jymp .9b,d6,es d6g1l oyjvbq :8 connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up c9z1slj6 y: e8ldm,dqoysjtbpgb0sk.3y , : v6 urrent?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a kmvou:r ;h(i lwqx0 g -h1,0gq24-V power supply. The operating current is 1.0 A at full speed. What i ;xh,k-w(1movi0 hu0ggl:qrq s 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 s,:p33v gtpjlfsc:,+5fq 0 ky mp;onocupply. The operating current is 1.0 A at full speed. What is th,q fkn ft5::ojcp,lv 3;0oymg+ ppsc3e 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 primarcl8 v(vpd.6;xmbt: he y 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-turn2188 ksoz peqasn+cxrc4iz, ; primary of a transformer causes 14 A to flow in the secondary. How many turns ,zc r8cx n; a2+k1zo4e 8qsspiare 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, how many ta o/gfd x gsa :- ktx;17s5nghysih/45urns are necessary in a 110-V primary if the 24-V secondar fdi 1ag/h/ 4xosg:x5g kthysna;-5s7y has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primarf/5pd,mdv 9j h9y8ihoy coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in th/my9o5hd8 di9p,hf j ve 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. Assuminp 1u tyj w-pnd/9.b)kkg 100% efficiency, how many ap b)t/.1wy- pd nkk9ujmps 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 transform / pom*dqbp.bb+po+y6q7l.kwer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whap.bo o/yl 7w+d qb*kbpqmp6.+t 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 se,azshkt0/x9t w 0kh. tcondary coil. If 120 V /hw h.taz 0kkx 9,s0ttat 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 ozq+ 7x3 kdom4vn its primary coil and 300 turns on its secondary coil. If 120 V aozk+vx7dqm 4 3t 2.0 A 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 transformexd /hcsm6mnf9xx+( s:r has 100 turns and its secondary has 200 turns. If the input current at the primary is 1hn6cs x(ms/fdmx:+ 9x00 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 100ysozf u))l :.a turns and its secondary has 200 turns. If the input voltage to the primary is )s:z. f)yulao100 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 turns*( uu oll2aye0f q8k:8umjpy8q)qav :. If the power input to the primary is 10:voul2e* amuyqk :a p8yjf (luq08)8q 0 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u rsm1hf;nymr dw1*/ 2kfj6 c7tp to 4500 V by a transformer and transmitted through 2fm1n6fw r1t c/;m* h7srdjky a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppedco4 opqzh4a60e0q hw1 up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the per41c64o we po0q qzhh0acentage 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 usuall-zt/ /fb(x9mwyz:gn lh755pvea yht 0y stepped up to 4500 V by a transformer and transmitted thn5by-7z/ fth( wpatmz:/l e0g9y5v hx rough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lo3m.xs8x8bycv, 2jbz(r b xts 3ng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of zc ty3m8b8 xjbx(x,s3 vr2. sbthe 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 k: d1cvqv r 7j p2oje/kxi 32mhf50+lkcxy: av:m long has a total resistance of 0.60 W. A generator produces 100 V at jvvycr12k53xfdl:q c xo mak2::0hjvp +7/ ei 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 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:abwz;6d )oo cy sf dd5x;;s*j a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1;ac6s obydwjs5d; dxo;) *zf:000 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. :c0 + 11hwdul+ ibgb:d/ hmen3itg8ye It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is ig 0 /h b1+tylb n8h3du1gdi :e+mew:cnot 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 enx( cgzpmguie:p/ ::um1t c1d*ergy is stored in the coil's magnetic fielcgpi1:ce/z m u*x g1dum::p(td?

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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 inductor. What is x7xu:a/q,hf 4v zxrl)this circuit's time constauq4x /h7 x:afvxr) lz,nt?

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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 u6 + o0p86t aklc,y/ctvu)s zt120 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 peak:hwgltnud(u291q b x0 current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is t+,rg kg)h *uszhe resistance of the lams*+urh), kgzg 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 conxw i2o p9ll14bnected to a 120-V ac power supply. What is the peak current through the resistor?9 llxbp1i2 wo4

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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 12o f1 g 5qdq5b:l8/f3dcu/yb fb0-V ac power supply. What is the power dissipubo5q fgfb1 / df3:8/l5cyd bqated 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 r*r ( slta4do,a 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorff428gl)wzl j 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 6h2wc univ7(o a1kf:v nl.tb2is $I = 0.80 \sin (240 t)$. 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 reactancekyt* so;ymqwcy2 3.2s 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 2.50-m3pgqvj*: cth,H 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-wc 9yhe mq(dcb;m 2t dgo*33d 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 inductive re8iqvfg z v::/lvk)ol*actance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency oq;,h3-w;hef jzn vg/ 6/kcw4 qmkfd;q f 20 kHz is app-kz;vgqmnww6/ q fh/ qkfde ,; j4h;c3lied 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 to-3eg1*xm byh o 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-mF capacih;q6y1 esv+h8c-d11f fxj ivc9b 23vnh uqto:tor 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 ofpff ks1/4kvdm ukr7s -+)mg z( capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1ft)sqd.7s l l)200 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 rqli w9fi1jzb:7 k ke )oe0*tt4eactance of a 0.010-mF capacitor be 100 Wibjtef:0z* ew7ot)qikl k49 1?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF)rn8en f.6m6:zq1sq a fwuzj* 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 impedancenlxb.v(wmc* jmu hwi-+ 1-om; of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W ca*-;mjnxmvw w1 bi(hl+cmou .-pacitive 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 10h:a 2 7v dqp(oq5yg+t8 csyt:d0-W resistor, 20-mH coil, and 1.0-mF cat ovh7q:cd2t+p y: (y8adgsq5pacitor 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 qc 1(8av se8 uliavp(.a 100-W resistor, 20-mH coil, and 1.0-mF capacieuivp.la s1c(8q (8va tor 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 connected in serryj sa,z fz )8fn5-y2mies with a 20-mH inductor, what is the impedance at 1000 Hzn52-y a fzj8m,fysr 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 connected in series with a 20-mH i bk w)u ,2ejc)02pais*sfhyv2nductor, what is the php)sifh e,uj 0v2c22)s* ayw bkase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capacf :ll9-c 4 cw o+sb0mw0ngnh9zitor for a total c 4hs0-90llcm9 n+f: wwgznboimpedance 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 seriesec,o*xiz pp+b,cw45gd0 r mv: with a 100-W resistor and 15-mH coil to get a total impeecog0,:wr5xpv ib p d,4z *mc+dance 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 0cz ;bf4dejvs0ud7*dseries with a 450-mH inductor at 5000 Hz for a total impedance of 40000 vf00cd7 z4s;deu b jd*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 5z1hc4zx u r3i100-kW resistor at 1.0-MHz for a total impedance of 150 cx1r i54zzu3 hkW?

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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 copksu/w kq89+u nnected in series with a 20-mF capacitor. What is the impedance at 1000 Hzu8qk/spw9k+ u ?

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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 capacitnlq0b8 .66 k;vra9lls9nwbxq or at 1.0 kHz for a total impedance of 45 W?.lb9rqqnl knlb8 ; v as9066xw

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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*sg8jrtie 03v)urm 6v at 1.0 kHz for a phase r06ts8v)mv gr u*eji3 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 (hvzauv0bd+6 series with a 30-W resistor at 1.0 kHz for a total impedance of 45 Wd0( v6h+zubv a?

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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-r;y xcq ym99u( 0dadme:dcc m8j,m0.vmF capacitor at 120 Hz. What is the phase ang d(:cy80je;9u c0,mryddm am cvmxq .9le?

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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 anj 6x rd+lp/erv j;-uhg. m hv;3zprw q)1f+o:md 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF hvp mhqu31fl +) oj/w; .rd;mvr+re :- gp6zjxcapacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consistssj*hu9aa dm8q:1bkhq(qf 5a1 of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-81qs qa91am bj kh:uqa(d5 fh*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 capa38yt ,0z, hpqreo2ez4nl s, psm*)lnmcitor of capacitive reactance 30 W, and an inductor of inductive reactance 30zs4nmy2l)o e *lh,3rpnms0,8t ,qpez W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cirt/qwa:eg(g qrle: +s3 .(krhvcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powe v(htlq :e.gr(gaq+ r:kes3w/r 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 resistor for a phr,h du g,q.b.e23q2d p saq5 mggy*pc)ase angle of as qudgp.ygcm5rhq2ep b)2 ,q. * g3d,$40^{\circ}$ 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 = 200oih3 c0t(v5ya gz 4ls/-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maxi(vy hg/0 3 olcts4az5imum 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 circuit with 12.0 W resistance, 1,p011bi vaolb 5.0 W inductive reactance, and 10.0 W capacitive reactance, when tvab1 ,boli p01he 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 Aq*ln:ysv)q/ v9 w9pqkC 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 resistancobg/.1uq yo s-il80 mkmm6r y0e of 30 W. What is the power q0. m0mymbsg/u16-o i8l kyorfactor?

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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 Rnkx+eh 4wl z3v ;fa)0zLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected wke0; n4zlvz)xfh a+3to 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 5n5 7,adnfzzhj2 z nk2in series?z2n7, a 5zhndf z5j2nk

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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 capacitor for a res qrd8c+7i7fi ,omib6 lfuxvi1 :lp/x4 onant frequefcm+v i:p uxbf7l /8idl1iioxq,r74 6ncy 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 needed in series with a 3.7-mH zsv8xno(dtfz vs6;)1c l es-3+ pbbn7inductor for a resonant frequency6; bcnxoz8ns v+ l(3zf-7)dpssvb1t e 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 place2r jkpv5yrb5dmnbf+.) 55:jcot )cpm d in series with a 30-W resistor and a 40-mH coil if the resonant frequency of thn p dr)tmjf: r)cjpok5.v2y5+c m b55be circuit is to be 1000 Hz?

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