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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 55pi 7 pls55it3opaj;ju3) fljt-evvmagnetic 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 st d7f3rry yf(kt o,(p.bates 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 wirismtf :k;w(j +y a5i4r tyonew6-;xw, e in a coil produces what kind of change on the induced :t5tnfkj wx i,i+yw; -ye;sw6r o(ma4emf, 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 cc hxt4n/r04 pg 6zf9pfield through a loop of wire produces what kindzch94g/4x0tnfcp r 6p of 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 wire produtttqv+*e+ws do1 e-s -ces what kind of change on the induee +s*twvs +1-o dt-tqced 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+*apm 1- 1)uks q( bkmmghy4sd a 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 by.9ykd6 y4/pnl tug j*n)/nsinduced current in a conductor will b4ld t.*69/ngny)ps/nyj bu yk e that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tabrzbp8m (bc g +9cn/7ju1y kvd7le. A bar magnet is held above its center with it1zpmndv/gb8 c9jr k cb7uy+(7s 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 o 316pp+m( ujldeomt3kn a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when vi( opudk1+ep3l3t 6 jmmewed 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 magnetic field vector pe743ckpqc g.loints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inducedlqc e 4.pk37gc current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regiocmv5q3(wp k c+ ps8)tzn where the magnetic field vector points straig5w cvc3 s)pk+q8 pz(mtht 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?

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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 regio6qym lgi1:dp2* a f x,o7v9eijn where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction 6: exfio*1v dja2yg, 9pmilq7of 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 carrim: mby y2a*w/tes an ever-increasing current northward. Two cbmwy*t2a:/ ym oils 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 thr1zftn4 m(bypai :4pc/ough a loop of wire with the north pole entering first. As tpp 1n yf4/: atz4bim(che north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wiyoa9bb/0imuk - 5dgq. lg (;xjre is rotated 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 thlbuy/xo- ; 5g9.0gjkabq m i(de induced emf is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an nw4jy e9+r i(aaxis whose direction can be varied. In a region where a uniform magnetic field points straight down,a (rie9yj+ w4n 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.6gg..j tzbb +7w6d uyu
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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 an w8v jgt7,fjseu7 3n;sut4,u xemf 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 m;md5jt*hzl 3pagnetic 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 (orisui) xhh z3l1,ented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the xi,z1u)3hh lsrod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal ba gd.vjtp 18prhq+;yvb./wq- qf0kfgzxg1d* 4r rotates at a constant angular velocity ω 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 tr- as e 80yj5l3,zz ci9-kwyk;c lsqc2fansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each seco1hluq g)8d/q1el rt6ynd. The frequency of the l1 6eythdl)q u rq1/8gemf 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 tox0)mwo ppc8 0v

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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 device cglg xupu5n5kdu 2v /u7)8jv1 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 l hp/2;2z.x;i;lnvaih k cpss )oops than the primary coil then it haic;2p.sixsn)p/zlh2 kv ; ;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 sebmarurgj*w 16fv ;20mcondary coil then ima1 b rwm0 ;*vjg62ruft 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 ayf- my41plp7t

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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 cidfuu twx1ll 2g(( x/x-rcuit,

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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 a8k4 onnbsq +,pre connected in series to an ideal battery of constant terminal voltage. At the moment contact is madspqo4+ ,nnb 8ke with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to anh/ff9sh + xvly2f9yk- ideal battery of constant terminal volt 9fx+y/fv 9-h fls2yhkage. 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 inductance L and resistance R is b *q7ya .d9(lhr,mtuk 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 resista-nmv dx,- az1snce 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 batno /hdc1 uwh9:tery. The time constant for the circuit represents the time required for t/c h hu:n9ow1dhe 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 connec8zz wxc8w8zx p16 qok(ted in series to a battery. The battery is suddex688 wq8ox k (zzcw1pznly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same un5gi1 e-e 419.wnoo/ xz7hgsu0p tmglkits 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 connecmvvrfo:82mi+ 50wzjki: j zh/ted to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cugy8mp2rm9-o8 f puh .yrrenfguyo2 y89mp-p .8 hmrt

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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 wharby c*hz.i da d9i63b4ytk,3wt factor when the frequency is d,b z49.*tyby kac6 3id whr3itripled?

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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 indu/cyj4*sm(ph* 5r;xv ebk1stzz: j ls5 ctor is doubled, the inductive reactance of thxspz/ :m*k5 hlcs*(jv e;zb14jyr t5sat 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, they i-53r9cyp4c( hpx0 bzft( ii inductive3 fxi tciph y-r0(4(yi9pz5cb reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, v19x(kst q7rzonl) ;9qig.r j3vwlj+the current;g tlv zn91swv3+qr)lqj7 i(ox9 jr.k

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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 factors +8svu1vloo91um,mybt h(6 z when the frequenu6 s(m1 s,mo 9ut8blyzhvv1 o+cy 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 whe3 acgax l;q 1:cv(7AC voltage across a capacitor approaches zero, the capacitive reactance of that caxce qg:v h cl;7(a3w1apacitor

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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 v-7jr bi /s,5kv5lcghv oltages of the inductor and capacitor in a RLC scsh/-5br7kil v ,jgv5eries 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 RLCd ss3*g:sct 6g circuit is defined as cos⁡M=R/Z, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit inc ydt)e:z0y5bxs;wg wu/ht 3 7areases if R increases. When hwasdzxy)3/ eutw;y7 5:0 gtb 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 of the circuit incrxt/bg*f oo;d77 v6l*fz2x .jn/+m nowb ux kd1eases if XL 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. i7ep+lx*h7)kru 4 s jrThe impedance of the circuit increases if XC 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 double in an LRC yt +mf0z(+a:) cdqcmgseries circuit, the restmy fqzd+c)+g0ac( : monant frequency 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 dri5 + ;jaz/h(kd8hxpdq 9 n8y2nmrw : t3dlr1npvven 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 circuieky)evks :n )*t 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 4.0×10−5Wb 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 rotatin pa au.l a/yib7yqik --io:x*3g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of theoayik*/ -3.y: l i uiqa-xap7b 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 w6ec-d5 rt*d8;dd yprrotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through t-86 dw5d;e crp*r dydthe 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 magnetic field 2nu8 b6c0vq yuof 0.20 T. Find the magnetic flux throughy 0n 6cv82quub the loop when the plane of the loop and the magnetic field vector are at an angle of 30∘.

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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 abxt f3;yt(bol* (tqj q8.jw3x djustable single loop is reduced from 1.0m2 to 0.50m2 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 changes )le.b ro6lio- s87tqj from 4.0×10−5Wb to 5.0×10−5Wb 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 d/cxfym)d,h9phub+dw 8 z v0) with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If / yhcdu )9fh)d0x wvbzpmd8+, 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 turnsr 9o8-*xvnbg0l ioao/8-epb3 cit w;)ai4qmb and an area of 0.40m2 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 area2j3r;; m*vj64u39e shwhvr)sp gwwl(kbagc : 0.20m2 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 spab8.gd zxl+- 1.3+xwnt (u,byuor dxcen of 60 m flies horizontally at a location where the downward component of the Earth's magnetic fielty-.x1b+lr .(+un,dxz3o gwdb8cex ud is 6.0×10−5T. 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 s 8ate70ui2nd that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis t0nts27 a uid8ehrough one of its ends while in a constant magnetic field of 5.0×10−5T. 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 cr5;8vz*(pbp8jfie uiqhq* (p t oss-sectional area of 0.25m2. 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 areadv8le, nxk1b6iq4 h3b6gq1ov 0.090m2 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 re9n -a0ze is*/ht* zrvpctangular loops on its 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 magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this genepzt0/vs -nr **e z9iharator?

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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 area ;xtha gvvc4lf l vo+aikfs 5291ro/ .)0.090m2 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 simplkj)yta8,* i fve AC generator with an output of 12 V maximum when roi ,8ja ty*kf)vtated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 100cm2, 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 maximum wr e jfog;7: v.t.qcu9emf of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of 0.030m2, 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 of 6.00 W. The motor operates cs 706:qnc vcpon 120V AC, and when running at full speed it generates a back emf of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 6is-jga;fpm;2h36 kjeagmw q69 sg/a W. The motor operates on 120 V AC, and when running at full speed it generates aq63;jigk; g6s6e-hafws a92 mjmp /ag 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 con5jr a z)i8gkg5s7.isv z.uk *gnected to a 24-V power supply. The operating curre ii7g 8g5vgjr5 )us.z*kk.azsnt 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 connecte qjad06b;ki1oh -, rlzd to a 24-V power supply. The operating current is 1.0 A at full spel1bjaokh6rz;-i d,0q ed. 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 n a.azg4w8/vqke 7hi0a 24-V power supply. The operating current is 1.0 A at full speed. What /i.a4z8gwvqnha k0e 7is the back emf when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reducehk r6b5 7psufnn. q64b a primary voltage of 120V AC to 6.0V 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 tra/(zr jue;h vtcv pr02rzb +s)0nsformer causes 14 A to flow in the secondary. How many turnsr0e zvurr b;z+/svjp2)( tc0h are 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 d-so s vqk;cl3g1m5xtw 0:eg. turns are necessary in a 110-V primary if the 24-V secondary has 1qg 3k0:xm5s1s t;.c l-gvweod 00 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 primary coil and a 2000-turn secondarzbpiu c;osjni :-k j/ol;;t: hi2 .6oyy coil. If the current in the secondary is 3.0 6 :n2 iso.oycup :-; joi/izb;;jthlk 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 t1era lbff)k) *ransformer. Assuming 100% efficiency, how many amps at 24 V can flo)e 1 fka)fb*rlw 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 neov eki9 -5tmftv)jhw2 ,n sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 Vt5v9i vf2h)ekw t,m -j. 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 sc9hi)ryl)+i bv8o 8 yqecondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the8+oy qi)ihrlv 89)bcy 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 prima rea - epfb-*z68,copzry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what currenob -8fp-* ,6acepzer zt 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 transformelq vo4s.l(o 2cr has 100 turns and its secondary has 200 turns. If the input current ato q4l l(.oc2vs the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seco; x an)x3tn0sqndary has 200 turns. If the input voltage to the pq)t; xa0 s3xnnrimary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.c) ted8+l:ztcmil h88 If the powe8) t8: 8 zmhilcltedc+r 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 12b/5p8/5f r1qoccbxet:wbj*dhuo0* j0 V. The voltage is usually stepped up to 4500 V by a tranbqx cuj8j5br* oo/fe*c/1b05: hd ptw sformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagkk 1o51/q xx(jqbl3keon4x e(e 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 linen3 xe4 x5 olqkbkekx/1(1 (ojq.

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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 usually ju / ug ckg,rbcva-63d-v2e )av:lf6 sstepped 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 uvv u6g/k r:v djgcbsa)le -f32a6,c-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 lf+/;uo ne s)yvong 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 v euy;on/f)+stransmission 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 oecy tw.dkeab:+ 5;hy 1f 0.60 W. A generator produces 100 V at 70 A. In ord b+c aey dy;kh.15wt:eer to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powf*qyzeuf0 ,iesp47 p) cwmy, 7er would be lost if th e p7,)y,ef*ucfmwz i4pys7q0e power were 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 44 :kg jgcnp6dip/r 57f)0 V at 20 A. It is to be transmitted on a line w 7kngpp/:)6icjg d5rfith 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 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 the coid)n .m-a2xz2ko1j nqll's ma2lxj-)n 2q na kmd.z1ognetic 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 inductor. What is tp c 2fktsn)3(9z .g3mxz0zsq this circuit's time constant 0sn2tzcx(s ztq3gf.)zm 9p3k ?

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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 thpe kk 7+wpl+ mxz:q97xe 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. fyfh0u/vh)w4 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 tw; ox9*qy 6sbicr- 0l120-V AC outlet. What is the resistance of the lamp?xoi ;rb-y 6qscw9 *tl0

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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 6jsnfaema8n vl+u;r 1guha1ei x( 9zes,:g).ac power supply. What is the peak current through the resistor?mg9h:1s e6l nruxsn e)iv1 (f jega.,u8;+aza

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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 9xnyyfo(jt,6 y7y x y7ac power supply. What is the power dissipated in the resxo 7t7 y9j(,xyyy6yn fistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rs, .hxn37plo6i4 pzb0jh h -ahesistor is I=0.80sin⁡(240t). 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 ih6 ,,mx7wbgjvs I=0.80sin⁡(240t). 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(s v+mp /mcvt,-W resistor is I=0.80sin⁡(240t). How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor u0/;zf kos.62 qm *e tyf qjtujz5x2q6at 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 2.8 t jb7*8whp6wtd bz/4gobw9 z50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive lt8 iv exgk iwv *911dcs((nw7reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hztz sx).p1vre:f0a 8 fn?

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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 of 20 kHz kp/dkzw: (5 onis applied to i n/oz( wkk5dp:t?

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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. 5tv/gntcy16 ndff3ku 36 ddm-50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF-ivt;ip(i h kw7cd+.q 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 50y /lclk2j 19lf j4m)/fhvb a(h W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 12z8b. eaudw6ysqtt -0o fzq(6)u6a) jr 00 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 reactance of a 0.010-mF capacirqss .6t dd -u2dx*;bbtor be 100 Wdu*;d.xrt sd2bb q6s- ?

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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 0.0010f k(7)ne8xcwf rzku.--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 circuit wi) d u/puvu(0s p*k7nesth 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive ruv dkp )7 ep*s(s0/unueactance?

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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 rfn+ luh0ll 6cb :8z1qqesistor, 20-mH coil, and 1.0-mF capacitor a0l: ub+1 lhncqq68lzfre 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 1 qqjv:o4g0 lv100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecqg ovjlv 0:q41ted 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 series with a 20-mH indumpff97 os ymq+y/84pz ctor, what is the impedance at 1000 Ho9ms+pq y48p/ zf7y fmz?

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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, what is cfuu 9qqd0kctw5b1n;;q 9*i b the pha1qb*u u9q 9ibdk cqn ;t;w50fcse 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 cap memijq/rtb33: v)5w dacitor foew5 3/btd3m vmi):j rqr a 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 isifde8 (nn( 4lr needed in series with a 100-W resistor and 15-mH coil to dn frenil8 4((get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at9/:hz3 n ys09aphby ikn8jdy( 5000 Hz for a total impedance of 40000 Wnbhi n8py/ ad:y99y(h s0j kz3?

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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 in6qjl2azz79 ug6q*f ip nfm. )c series with a 100-kW resistor at 1.0-MHz for a toiz2nq9 pljf6)umf .q6c *g7 zatal 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 witi(w lfe qf;2 shqn/o jj3qj-b c4b4,n2h a 20-mF capacitor. What is the impedasi l,bo(2qn bjfhnq32 4f4jc e -j;q/wnce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nekhz4xlfd1pl 08 5oh h.eded in series with a 10-mF capacitor at 1.0 kHz for a total imp h . odxhklz54l0p8hf1edance 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 1.0 kHz foriw;k3wx4 wjj 1 a phase angle of w;i13w wxjkj4 40∘?

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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 1.0 bvj/3 7fgbyic s*wmy l:glmid 89,. ;wkHz for a total imped:m;3gw. j lc9f7i, yvgmbsw/yd lb8*iance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 1w 9j;-y e4znp wjt5l7l20 Hz. What is the phase an7jj 9;z n5e-l4 tylwpwgle?

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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 i lsa9wifam ,8h8/.vy resistor, 20-mH coil, and 1.0-mF capacitor are connected in ssh lyi 9,mifaw.8 v/a8eries?

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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, x (kwsr0*s .zra t02znias28ua 10.0-mF capacitor, and a 0.350-H inductor. The circux 2zsuan80s a*2(wiksrz.rt 0it 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 ind,crad*cz6 mz8vvze5 9b5cr3muctor of vrbmc3e9czr m5z86 da,5cz*v inductive reactance 30 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 circuit containing a 50-W res c *zloqh8ziaw4cm7lxe- gs+1+n23od istor, a 10-mF capacitor, and a 0.45-H inductor, when con37wexm h-icc8+s4na lqdzz2o+ o*1 lg nected 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 5c e,nop0fa /-j kl*ej(/r9y ap00-W resistor for a phase angle off/jn0a-*or pe yej9 c/ ,k(alp 40∘ 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 frequ l+sik: ;9kpjh sa8+nyency should the circuit be driven in order to have maximum power transferred from the dy;+s:ila sk8n9k+ hp jriving 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 resistandlmt5n 8xr4/wt)zkf5j8 n ke2ce, 15.0 W inductive reactance, and 10.0 W capacitivfmtkek xj dr5z)28w4n/8tl n5 e 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 ci:b5/l ek1udv7f)ksb lu dg (28xxsv/frcuit is 63∘. 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 imp vm3ih)7s :fl n8zzyos ,p1zl0edance of 60 W and a resistance of 30 W. What is the pown3ly 8pzi:s,fmvh0z7 l z1so)er factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor,mlszcs;cj6+ 6i9l9ya a 10-mF capacitor, and a 0.45-H inductor, when connected to a+m69 ac9s l6lzyi ;csj 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-mHa 6( kuj2zakj7(fu* q.tlzn7s coil in series?.at7u lqza( kfz6(7u*2kj n js

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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 resonant frefs9vv l(ibjx o-n)b328bo f p,qu8 lpfvvbo 3x9,b nsio(2 -)jbfency 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 sdqi; at1h :kt4qqc * u;ay.zsbg+ -1qwith a 3.7-mH inductor for a resonant frequency of i+catu qs1-k t1qy ;4qzh*a:s;gq.db 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 series with a 30-W resistor and a 40-myawz3s-;cy kdbmn+. 8lh)6t/ lxjp 9zH coil if the 3b lcn/ sy9za ;wj 6t.m-)ykz+phxld8resonant frequency of the circuit is to be 1000 Hz?

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