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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excepbn 7mpo)ze i94t

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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 thaj c eb*adp1m-3t 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 change(ex8ga g (,(e3yzi xou on t y3(ou8(x( aeeg,izgxhe induced $emf$, 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 loop of wx-c3vnn:5g a dkug;b lj z)v(,ire produces what kind of change a kz )cdu(,nvg:;5gjvlb -3xnon 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 wirf*m 6:orddr7 ie produces what kind of change on the inducedr6o: f*dm7 rid $emf$, 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 fr .ymo5 q ow3,i3pqcal2om 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 dempjb* 97,b(2hflb3s1mj)3ti d kwq an induced current in a conductor will be that which tends to produ)bldhw 92mq7me *ksib 3btp f(jjd1, 3ce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is-kq wjvw84*z(p ps+ ksh4vj n, held above its center with its north pole pointing down. The stationary+pq-j(v4hksp*z,4wwsv jk8 n 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 liesl/0ppjl c vmr3- :3or*c9h7 e,3vq kru4fx hzs flat on a horizontal table. A bar magnet is held above its center wmr-oe3rplcjhvqp ,7:/*3 h0xl9srvz3 uk4 cfith 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 the magnetic field vectol+pv +w.azzj3r points straight up. The magnetic field vanishes sudden.+j zazp3lw+vly. 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 tau k7y+fml.((ph8i.rytjo: 7 tb sogt-ble top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fromit7m(gy(. jt.p lb r-:sth+fy8 ku7oo 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 top0mj j y0a4: eoh(.rgcm+pe d bfi34ephu-pi,9 in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from abor0jp9jm dpc(eh04gpa e4,-mi. b3u+eo : ihfyve, 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 aso;l ui9ke o/xgp- efi2n(v* 9 horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When vlk/;vix9e(oso -g ie nf 9*2puiewed 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 through13u2z v zgdas-kpux rz+)l0g* n3dsr, a loop of wire with the north pole entering first. As the north pole enters the wire, the induced curren+uudg* 0k,3-as1 x)rn rzg3pz2 ldzvst 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 d+4 mmu roe +no/hzb+4speed about an axis whose direction can be varied. In a regionbnuz 4o d4+m/rehm o++ where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated 55e u3zg9)d2y enabtn+ fkv4tat 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 rotate fug3n4vya )2kb9n+5ettdz5 ion 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.y7zkn8 x b) zwew y4y1k053xjt
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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 39s*nbmpi m dq1r/f- e$emf$ 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 magnhobr+r4ya8 n19d boh -etic 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 the east-west directs h;(m3a jq*. nk9wqzuion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential in3k(jmqnu*a;qs z. w9h duced 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 constantshz/ /n80g k 06bocrgryw*wpf qt r5ah1n.) w: 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 generatorxw2 sr7 a4mr zm2dvb8si p/q21fkp 5m, 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 revolutions each second. The frp1xs; k8lbbhg 2npx l9.s(w q 2t+2hfoequency of thh bxf8bnxqw (o .2kp2;ss+tpg hl912le $emf$ 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 b2j(oyp so- 6cused 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 detcy-ba8ks3i zc3 9 2kzy/ h0+h-(s i akwzj1yyvice 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 mob:ad sm0o0g *wre loops than the primary coil then 0asb0w o d*gm:it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary , uzwnoj8ikr p/:nwti89s ) :ecoi:)kpusi jte w inw89zo,n8 /r:l 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 powe w9t ( i,xnn2p6x-f6-eeu smopr input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit,nw0 u 9zyhix 7rg1-q1d

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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 conn:f s*:*kfxcjgf5see / ected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltagec*s/ je:ffs5 kg f*e:x 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 connectek+/ k oozqq dg+br,9:vx ,fc;kd in series to an ideal battery of constant terminal voltage. At the moment contact is made+ 9g c +k,krzb vqko/,x;oqdf: 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 resistaouk b8bvx6 .b08/egt lnce 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 R is connected to anwkbtx a(yvaw9ohzfoosw-( :4c *4yfl;v..;o $emf$. 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 bat 1 ejsocu;+-0w ch1;t -ovsbk:eeqr- ctery. The time constant for the circuit represents the time required for the current to ;v -q0 e1s:s kbo u1+ccch;ewoj-ter-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 bats h0;g9x3a/jdhuae h(tery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for theh3sex0ja 9;u/dag( hh 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 hav mg h8;f1uf.sdbtr)/o6fzs7 ve the same 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 suf*lki mwsu8z/kkvhn9- 2bd / /pply. 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 cibj)x 8h9/lditrcuit, the currentlb j9d8ti)x/h

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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 circuite-p5 uk8ob mp2 changes by what factor when the frequency ibk-mup epo825 s tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the2 b6i/ yiwqe)n +h-ixc inductive reactance oib6x-i ewyn qc/i)h2+ f 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, thva/h 8*tp+s2tx (ngwre inductive reactance of that coilh8w2(* / +tvatsng xrp

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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 supp e*w-olq lqm++/ jkua)ly. In this circuit, the current *ll mwoe+q q-ja)+k/u

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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 tar/.v xg:ox /hu)j jcf dr0d(9he frequencyv( )/jxo :/d9. hfrrx augj0dc 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 capasxh;i7w- liu /citive reactance of that capacitor uh s;-lwii/x7

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and cak()l75.w jld w iph:hdr72o u;nimxr)pacitor in a RLC series ci7k7(;d:drjh)h wlo piun5 lrw )m i.x2rcuit?

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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 circuit is defined asr // *5dcj,,jgbczuhw $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases .9gtkw -i:dti if R increases. When is this staid:g i9 wtt-k.tement 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 circu:fz vci)ho d *jg+61igit 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 incre tp s*c32hq:w0q *;8zygygpnu ases 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; t. 5lqv;vehfuble in an LRC series circuit, the resl .;vfh t5vq;eonant 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 drivenl2yv,8 q 4v)y*rtulnw 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 :h 1qeypytlq4.p03lyc w7gk3 g3yjf 7circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is r;gl.c(6lilwy4wbk : xotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throug4;l i. b:gww klly6(xch the loop when the 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 mag06vlr8 ;usplfr /jav5netic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loopru5l/p;a6jrvsf8 l0v 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 5uv3 9z7;lkl i9 wtescpvf):bm is rotating in a uniform magnetic field of 0.20 T. 9 k:7s9;)bz3wv 5fillu c pvteFind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frkcb,q 9tq6 5,)vebkr tom $1.0 \; m^{2}$ 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 changedwo;she 86 lzbv9gv):s 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 tuz k8kat-ei (ywp o 5rn8+f:-xqrns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.tnzky8 + 8fpi:eqxr(o wka5-- 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 anu.c y uwly5zsai 9p)3,d an 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 anzu j43au j8w(cd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m fb93n3wcm;uu7 fhj9t; lxk1 vy lies horizontally at a location where the tfc;3 ulmn 9xu;j73wb9hy kv1 downward component 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 igah 97fx4jte 0w dw)59 usuc/aa) 0hhas 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while i )awu)7/gwu09h5j49afsaedtc0h h a xn a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and aio5o :d.2(uart i ob 3/ggxo0k-mwuw4 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 of0ts(*u ,)ue 9wd 35lctarysve 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops onm3sb cgi*hxp-g;51 v g 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 txpbg -g3s; 1cmgh* v5io 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 oasoacji.k( v 3 -(5hetf wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator withj3 kpkv(o )* yl58suen an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available.*3 )lpj8ek5s(nkuy o v If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a p13:k bh n9+ayka.rbt7 qu 7utmaximum $emf$ 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 of 6.00 W. The miysqea 210er1 m)a,w*iqgpf -otor 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 hasm9;ej 8 nh/umve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fu;e u hjmm/s9n8ll 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 is connected toq vefmgx*l:cjn9io9c6 - oy/2 a 24-V power supply. The operating current islm9ce-fvy o:9i con/*q6xjg2 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 connected to d1r 8qduha,u)7mrx1w a 24-V power supply. The operating current is 1.0 A at full sphqu)arm871xrdd,w 1u eed. 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 resistancbq 2.;.mrrs wm,isls8e 6.0 W is connected to a 24-V power supply. The operat rms2w;bl,rs q .smi8.ing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary v.k.b5 f-luyhholtage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary :1 z:hqwk n6zlof a transformer causes 14 A to flow in the secondary. How many turns are in the secoln6wq 1z:h k:zndary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary ifs kjts -w+)sm qwp:c3q+5pn r( the 24-V secondary has 100 t+kp s:ws)c- qpq(j+5wmn rts3urns?

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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 2 3zoymbo z (ven(am;1mdrxan7:jre (/ fo 8p/)000-turn secondary coil. If the current in the secondaryo8(mnmz3(/ayj o);r7nd1ar(z /x fe m o:evpb 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;br fkql50 vdw7g1ao;6(tm r j in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 ;qkrvod; m (l 1g0bj5wart 67fV 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 transf i)3n7wlx wx. o9ba6ldormer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drlxlaw73x.ni9o )6wbd aw?

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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 300pox2/*sx b eopi u9:*p turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voi xbo2ps*xupo *e 9p/:ltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turn4rvt3 z2at(hz s on its secondary coil. If 120 423rht vzat(zV at 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 transformer has 100 turns and its secondary has t t/xo0fpk+xzlh h),+ 200 turns. If the input current at the primary is 100x,/o+0p zk +ltxt)fhh 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 1nmt:afgg8x,kk .mogss:4 t 24 o72tjp00 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V:4o.4gf , xt gpamn sskk82j7:tg2otm , 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 ayc2 1rz(dmje0s;/ru secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectindmr (/1e0 arj u2szc;yg 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 120jv8gvr9q w;9w1 bj: un V. The voltage is usually stepped up tw:91b uqrvg9wjv8 n;jo 4500 V by 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 l 9myd- )ggdy-+vh;a k120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentageddhay+ )vy; l-- 9gkgm 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 c01l 4.6 nmkyycbbv1o l.+sl mgurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resis0gom.bky1 16c + vy.llmlb4 nstance 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 long has a total resistance of 0.60 9, i0g hu , 7r/zcsrtqeyvqq 2(vww7d6W. 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 of2w(tq,g/q0d ,6zrc7 yh vewrivuq97s 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 ek(-n*cqlwphv t- 68 6 epggv3has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to he-6*gq3e6vtcvw l- p8 (pe hnkgating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would b-k8lw: w5qk cse lost if the power were transmitted at 3000 V ins qw sl85k:cw-ktead 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. 3r k16bh(peicp 6p;sd 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 not to exceed 0.010% of the ;sp6bi k(phpec1r63 doriginal 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 eqw93im 53 kvzvhhar.2nergy is stored in the coil's mag ha3qmvr5.9w vhzi3k2netic 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. j7m5z2n/ qbku0-W resistor and an 18-H inductor. What is this circuit's time constant?bj5umznk q 72/

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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 inkus5 pv7k5k,0ilgf2j an 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 plac1d s93gtzsc7;gde;lp ms h m r;t;pg0-ed into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resihke,wz,a1dks ; k*f7 o kpo)3ustance of the lame hzu1ok ok *kk)f3s7dwa p;,,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 the peak curm2xig 5sur6un+i 9(d6fn zy i8oy7,curent th 8si2zuyy+ c(9 r d76in,fnoum5 6gxuirough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V az7yk a/ qvgy;stw:);b be n()pc power supply. What is the power dissipated in the re;yw; b/y)ptg (:esq)vzkab 7 nsistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through d)ur5v a+go)x t 8pgy+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 *-.ymph9fz gx tql(.qa 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res vbx,q 9 z1/ielv)iyn/istor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH iniltp)g)cr9 . h)fpao6ductor 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 d h8l6da-3bkc*d*;g rhp-x 0wvs+ -y jlky9o ureactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.; ha)p edt,ir:nc85ub0-mH 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 nece0h/bau3f up2yssary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at 6jcb/m6 dtsf9 a frequency of 20 kHz is appliej9b ctd m6/s6fd 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 a 110-V, 60.0 Hz sourkx*7w:essg3w kvogy* c8dc(7 l-wc 3zce?

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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 aet,obh69pj h q )p7-pet 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 neededw xkq s9:p) h.2+pxmkqof),rl to have 50 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 hajf 9tsal d0ira6/xj+(ve a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of cdn/o.lqg +;ha 0.010-mF capacitor be 100 W?q h lgn+do/.c;

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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 a 4fw5cajka q-1eo; ,k0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 3*09p z;s c vtxedyl;,gjew(pW resistance, 15.0 W indu9d3je;p*wztcs;yxe v(0g p ,lctive 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 resistor, 20-mH coil, and 1.0-1jx 8+b8cz zffmF capacitor are connected in8+1 zbzc fjx8f series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF e.ac:2cn mt k -cj;k o*p)xc7rcapacitor are connected in serac tr7 cpenc:2k*-)ocm x.;jk ies?

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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 it3r :c5jdv83 +ygy: w4eiu;3cc qz lhpfv37 ntnductor, what is the impedance at 1000 h3jic:nl:e 3zy vqct ;cfy 35+rt3gw8dvp u47Hz?

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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, whaujr,byg4xgnl 0o. +8z t is the phase angle at 1000b0 ygnj4u. xor8zl+,g 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 seri5b,mg vrnt: zsyq9,n1es circuit with a 20-mH coil and 1.0-mF capac ,g 5ms1rzny,vt:b9nqitor for 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 is needed in series with a 100-W resis 186 w+6jwtqtvxg5j bltor and 15-mb 861w5ttxj+g lwv6qjH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mnapld07)ju +4q d -qimH inductor at 5000 Hz for a total impedance of 400l dqi7-ampq)d+nuj4000 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 +yu ;dv4zfj7xo c5qgoix f984series with a 100-kW resistor at 1.0-MHz for a total impedancqf9 o7x cdjx+845z4;ugif oyve of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What rq:f4 y)w ,zfeis the impedance at 1e4 fyf)q: r,zw000 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 x+ttpph,vpm*t/vdv /k 9x:p s)nm aj2d6wh,(with a 10-mF capacitor at 1.0 kHz for a total impedtk+xdjwvpp(2 /: 6)phv,/d t tnp*mx vm a9h,sance 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 capaz .gj k7b0qw/mcitor at 1.0 kHz for a phase angle m bzj7.w k/qg0of $40^{\circ}$?

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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 resisjr :, p*xbvxe:rb2j.ntor at 1.0 kHz for a total impedance of :jbjnx *b:2pv ,e xrr.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 1lq s xo,hx;(cdyy5,r2yj8pk8 00-mF capacitor at 120 Hz. What is the phase a8yxkj 52hq;yl,, os8(rypc xdngle?

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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.k*j 4t20 m(mplifamr 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ik (fam.j2t0m lm4rp*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 consists of a 100-W resistor, a 10.05n)rsr j*i:gxyz1 h*e-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power *r 5ys1g:xeh n)jri*zsupply. 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,c 7 p;jxzv )zsstan1k,p+ j.1l a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuitz ,1pk)+p7 s jlz;.tvjax 1cns?

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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 resistordn(wq5a3bo3 s , a 10-mF capacitor, and a 0.45-H inductor, when connect b35awq (3dsnoed 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 ser-3pzhu (ejhp/z*fww a/rd4dn0,;k sh ies with a 500-W resistor for a phase angle of,; spndzwr(ahp /h4 0fhjwekz u3d*-/ $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what /*j3g /9f opaz .hadbx*ng r:tfrequency should the circuit be driven in order to have maximum jzt p*9*3g:b.fo/d n x/a gahrpower 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, 15.0 W zfsix.)hhyg 786tv )iinductive reactance, and 10.0 W )6hizti)vf7yx g8.sh capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an bdn0iyz2g k9xk ct30. AC 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 Wmw+c 3k 4nqr,8emw-;r9t okbp and a resistance of 30 W. What is the poweok 9;m8kw-b3 twmn,p+4erc r qr 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 resistor6d* 8le fgf)r 1p6 5puscy7xme, a 10-mF capacitor, and a 0.45-H inm yf pgd5p6u6s7e )re8f*1clx ductor, 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 frequ jal2ipy)a,3t2x nn ,oency of a 1.0-mF capacitor and a 15-mH coil in series? ,al,otxy n2)a3ijnp2

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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 se 1ob-r)jk, afor a resonant frequen-ekarb)j 1o s,cy 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 inductor for t:m( 46ngh ytva.roo o)* bi)wa resonant frequency o (not4tb .vgy)6o)ow*mi a:rhf 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 mus8l0d:ayxbpoqg/uv0c 4 7 scg 1baxfl4a +u05gt be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequeux/dbu0bgg cso 5v:0 l78c0 g ya4pxlaq +af14ncy of the circuit is to be 1000 Hz?

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