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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 ma68rpinzz 5 .n)zr)rh* w,uldxuk3 k3q gnetic 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 thrclymq0 4 525nl;h s)kshckb,at 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 onx ;.. o5aol;w-r 2ryecyjza2c the in 5rjoexa- 2c.2zlyyor;.cwa; duced $emf$, 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 magnetk6t4 (5v/w4 yeypvrhk vz*hn +66 qwxhic field through a loop of wire produces what kind of change on the in y6y(kerhv+vw*4 6/qtpwvhx h 5k64 znduced $emf$, 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 produces what kind of cheyyh y 7l0 /5h9thx)ql 9,vjarange on the inducv)9j lh7 xeyrqa0,9hyty5l /h ed $emf$, 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 fro(7rxn* j w m0ggz8zcz(m 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 dovqjp /o9r *+e u*yhoa m xogpg**5(m+irection of an induced current in a conductor will be that which tends to produce which of the followi *r o(gpqhou*/ ea**o +vgy mo9+mx5pjng 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 hor:ko.mi:t m 3v r;ac 9q u)vnwar;f.lx;izontal table. A bar magnet is held above its center with its north pole pointing down. The s:;).rvvmtkcu9x;:q a afr;i l n o3.mwtationary 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 tab 4e558ixeccs k8:u9 lf wp9mmmle. A bar magnet is held above its centewekm45l m95c 88eispxmf: 9ucr with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on ucrg:wi oext:-5;g ,ma table top in a region where the magnetic field vector pointsr-5 , ;eit:oxgm guc:w straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table to pdx pi abi,))v;s 66ngp)t8qmp in a region where the magnetic field vector points straight up. The mt ip a6sgpbni xv8 )m;)p,)q6dagnetic 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 region where the mahx+/pdo a zv- o 0mprmb3.ic1.gnetic field points straight down. The magnetic field disappopbpczxr.m-a+3hdv1/i 0 o.mears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increas49sj6 rzzp+snp- t/gbing current northward. Two coils of wire lie flat on the taz9 - zp p6srjgt+snb4/ble, 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 ( * igfhl4 jzb+1.:fc1(kxkt z4 ehxtunorth pole entering first. As the north pole enters the wire, the induced current will be (as kh* e11ff tjxucgzh(.z4kx4+l: b(itviewed 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 aboohdpu(4r8n*a:qn p h :x-zy0 nut 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 rotatih xd-nru*p(py48h z: :aonn0qon 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 at constant angulariu jz crt7no *h+, i85;br(k y5fdpoz: speed about an axis whose directionjb zyuno*:h(iri, k ;d7p8frz5+o c5t can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the 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.-qn h ,)fcq5p6dfegau :c; v2e
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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 tsv7: nj9zse8txp v3 h,hat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fields91 7n9tyq jn9ca) yzi. 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 directj39yq ,ixzqb -ion) is moved northward at const i9zxb-jqqy, 3ant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates 3hv tpegwxt6a3q: 4r8ny 47u yat a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trans8 t:0h9;)xwy6 ol4j(j 8erfc z 4cj+bxsllgm kforms

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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 re1iu-ka 5af(l kvolutions each second. The frequency of thefa -1a(5 kiklu $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used 6dv+rl5 fi-kjto

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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 devichtqwajyr 08* i: 8gy3ne 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 secon -5w65bg7uy qk wtsg.(guh7wsdary coil contains more loops than the primary coil then it5(g7qu 7wky -uw 5wb.6stsg hg 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 l0 m /j/,mkmryfi*1mo)d x/ tpjoops than the secondary coil then it is ax0,)pjmmr o*dj /tkmi1/ fm/y

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th lti08l(h i 2bbwgjcv.*t1f b,e power 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 cir4w9btrcj 3j fp*x2 uf3;uh6hycuit,

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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 to an ideal battery of coj 2+m-s/ kos o-bt3 5wostjv9gnstant terminal voltage/b5sgjmjws-k9 - osott +ov32. At the moment contact is made 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 in)evaqdu8dr( +7g x;e7unfh xb qp))w1ductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the uf wqnxav+)rpxd 8ebq)e 1ghu)(77d ;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 connecc+0kjbb 2k bq;ted 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 +*4wlf h sr5ozR 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 cf62uo ij-*k gronnected in series to a battery. The time constant forgfkj u*i o26-r the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batterc,i; i p/fza)dy is suddenly removed froc;apz,id) i/f m 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 units exm-lywdt 0;c *mcept:

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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.* 7n*pr t /js+1zahoim-.mbof 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 curr8zk1:wy,t (6 fljkdod)* .b aearty9fen 1,r:tdtfdk .9 68yjaeyko(f a)lbw *zt

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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 otg w f3gb9iw8d13mk+ r.39qwvw xun1 ac circuit changes by what factor when the frequency is trip1mvgwwbu+gq89fkxi r1 t39o3d.nw3w led?

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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 acromdflqf;(:w: pwj g51f1 wy ye.ss an inductor is doubled, the inductive reactance of thatf:1q1;j wp:fy 5w .e (glywmdf 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 approas9 ev;4m6u)w er-jl jqches zero, the inductive reactance of that coruel -s6qj; 4j9 mewv)il

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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 tn7 md1d/bz- pfhis circuit, the curre /bp7dm n-d1fznt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancpr e l3sihw+xj2i(y22e in an ac circuit changes by what factor when the frequen(w +p2x3ii 2 yhjles2rcy 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 approao 0 1.cu-lcev m)2awabx-4rteches zero, the capacitive reactance of that-4 - uatr )xbclowvc2am.0e1 e capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between thkj*sr xjlh- 3fh60u4fx(eh jhc ,+7ft e voltages of the inductor and capacitor in a RLC series uj,l0f h4r6jxf s t3kfx*j eh(-ch+7 hcircuit?

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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 iss. +lgd k8 fwfd/va y(pd/z1e8 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 increases if R increasd0 5dwm2jf(wpe8q0 h+kn fa j.es. When is this statemfm+0 hq.2w j5kjpaf0w e n(d8dent 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 ctjg)/xnj561 c x u:casircuit 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 op:9 k/unhxs /of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance bo wahq3z-3s i0 )yvwu9pth double in an LRC series circuit, the resonant frequency of that z v3qwp )a swyu-3h0i9circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resofm:q52 aq4tpv nance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a serie 21(a igkz bajd1c zvf62:gen:s RLC circuit 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 rof+q xrajt0t,4c(vg4 ltating in a uniform magnetic field of 0.20 T. Find the magnetic flux through cta0 4v gr qf,l(+tx4jthe 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 sts4wch;g ; h-ks q8:ais rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the l ac:-4t;w8skghqs;h soop 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 radiufmo18biwf9r 8a (g e wso//(wgxe x(/bs 0.10 m is rotating in a uniform magnetic field of 0.20 Txxr1ie w fg (o// amb(g/ w8fbe8os9(w. Find 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 adjusc1m1h62 :n m*p p 41oofwsbjbk(m -qjitable 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 changesp+m2azqehmxk1; sudnq5/ d++n :z- o 0kxjbg6 from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square fr-:9t/rx ijyk gqqyw (1-vcdz 7ame with sides 18 cm. A unifor/j xyigr tc - 7(vd-yk1z:9wqqm magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an 4 b 8mqq nbbngp8o zj-6 p)ndo41ng:l-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 ar(py0um. -vssb ea $0.20 \; m^{2}$ 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 ofy5ez7avp kq, sq6wcme pe s 2e)82;cs- 60 m flies horizontally at a location where the downward component of the E,cqz5qs;sp8w6 sc eme7a2p)kye2 e-varth'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 2u*cqe3qghb0h6p i,k71v0ce ;h. im ho.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magneoq7pi0v 0e,. h hbg k qc*h6i31mec;hutic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-s;dhx:zb8 xx/q 6irem)ectional 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 oiwz3: dvtd9c3f 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 mq)ki1 *iw t8cw3q7p jrectangular 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 unif3tk8)qij7mwi 1* qcwporm magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire o*h.rtx, m(hm/ jr 8ojvb+5eqxf 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 with an 2jr2ovr/ z5cu output of 12 V maximum when rrr52c/zvj u2ootated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximue7l ozl,,l ,tblv 1-jxm $emf$ 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 h /b5ddtf im*,bave a 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 resistance of 6.00 W. The motor nwd*8eqf sip,p8p/01) wmlt2 aom.nkc/v +b moperates on 120 V AC, and when running at full speed it generates./s) /2 pmo1cvkwn, lneba8mt*+ pqpi8f md0 w 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 to a 24-V power q4xgz w(t6, xnuzq;j+pf(zk3supply. The operating current is 1.0 A. What is thzn xzqk3p+; (, jq(tfzxug64we 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/p mppk8 :zbn.h d0gtoast264 6.0 W is connected to a 24-V power supply. The operating cut6n/p m4dpa z8p:bs. kto02ghrrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resi 6 krzsb2 dykre4j/:gq4rq(9qstance 6.0 W is connected to a 24-V power supply. The operating cur4dg6q2qb r/ z4j (skq:r y9kerrent 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 needeyljwi-kn: g 7+d to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow inb7r..rvvy xhr +o. f-r the secondary. How many turns7..vor r vb-h.x+ryrf 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 turns are necessary in a 0zbqvboib5ml : 6x8t ;110-V primary if the 24-V sec; obqbt0xvb8m:l6i5z ondary 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-tup2m ;y,dtrm1 irn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 Ai;t d m1,2pmyr, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuminhvrao/m0//. w igf)nf, nwx,4 g c9zijg 100% efficiency,h4w)g ,fm/wnf/.i gr,9vozxicnja / 0 how many amps 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 t cvwu0j;fn ,v7n,0lwf ransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primawnv7n v,jffl,; w0uc 0ry 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 tm8 s ksyozv b33dbjf+sy0t(* /urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2(t/m0j*fzkovby3 s +ys bs3d 8.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its p azw4 m9:jr5i8trb8 klrimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is pres54brjr 8 :wl98mtak zient 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 turns39nf qh *tiebc2 m usp 8(nnnc-8qi:t* and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at(c9fi ms2n 8nh :-bi8ctntqq3 pneu** 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 secondary has 200 turns. fb( *2k j4wc1/hr sfvlIf the input voltage to the primary is 100 V, we can expect the output voltage of the secondary bfk2r (41* lwch/fjvsto 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 s fe hhosow)wq/28q/g+ 7lwfub+c qx;(econdary has 200 turns. If the power input to the primary is 100 W, we can expect the power oe+g/q bhc;+oo7u fhqx/ w2w(s w8qf)lutput 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 stei:hb 3c0 ed/rppped up to 4500 V by a transformer and dbe 3hp/:ir0ctransmitted 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 voltage is usually s88h ,wq zyk2vr7 *sjjrtepped 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 lin8 *rwqhv yz2jj k7s,8re.

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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 usualbjxj p4v b r)u2:sey/.ly stepped up to 4500 V by a transformer and transmitted through a power line of total resistancej ebj:2 /sxb.y)4pruv 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 -qgh* 5zpu(hh0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tran h zgqu*hp(h5-smission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60yp6j g8a.qimb3.sfs z* m ,o)t W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltsi,z.yms*3 g .6ojq m)apf8btage 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 Vnbjtjz q075i1j h4o8 w. How much less power would be lost if the power were transmitted at 3000 V instead of at1n8bj j5jwt4h7 iq0o z 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tra ji ywqc :rn(y(g/;n(znsmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stew ;/ c(zjn((yygqr: inpped 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 storedmpy7imlw5k,( s to6myr8a(y1 in the coil's magnetic fielo ,tm m5al(7wyr8mk(1y6 pysid?

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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 annb 67 v2x0d3cykj+ pcq 18-H inductor. What is this circuit's tpd q 0kybx7ncv2jc +63ime constant?

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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 fowu co5i l6gc6/ke5c05ugsd-:mc:jthe rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is ty 0nsaf gz-hko6 t( rq-u1*bj*he 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 resistance of thebfjs/7 af9 zo;nc 2lnr.2e* eu lam/ae;uncs e.*fb o9fjn27 2r lzp?

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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 1k 5 5sfarl7m.h,gj(2y,10eilmzd cj g20-V ac power supply. What is the peak current through the a0h(m .g,5lecd2fr jj5szlk,iy7mg1 resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power syqwdc4w.o cm*1q5pu+ upply. What is the power dissipated in wuop1cc mqq4 .*+dyw5the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is;7fzhb hj,g+t 38i mms $I = 0.80 \sin (240 t)$. 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 resistoajgxqq3ias; nax tg)v688: 5cr 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 rfdl oalhk(24wcjg 16gct, g5; esistor 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 induct wq1hzh(yr .qnhhc:*2 or 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 reape;1 .nxv28 1n qfyclactance 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 14.0-mH coil have 14.0 W of ind * sbu+x8er9yhd1 uy/yuctive 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 ygv(ip f02v:a157 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 anq2 , dqj1yywai4h+. it +o8oy 60-mH inductor when 120 V AC at a frequency of 20 kHz is apj8yy2w+o1q4,+ oy i dqiah.t nplied 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 sourc+ xerh+o i8qun o6.qf(e?

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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 capy fj),r n63)bgv7f fy9igaiu1acitor 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 i w ,wfpk-1(kwy6q/mW 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 doeto0+o9 h wtasdhz7d7b *uwul mwv*4 :2s a 10-mF capacitor have 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 a 0.010-mv.0o)tqmyo apg0m2km f/.nr, F capacitor be 100 Wym.fv)gmoqrakn/ t o2m , .0p0?

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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 capacitor at 100hbmdy64jv27g1ir - o4wk7:fx1ulaw f 0 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 seri3+eda /b-9t(xcinipx es circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactea pncix/- (9d+ tib3xance?

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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, 20qji6lfo88 3kt -mH coil, and 1.0-mF capacitor are conneo8jq f63likt8cted in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistp9ah o(k+gxy2f/xt p 9or, 20-mH coil, and 1.0-mF capacitor are conoapp/ txxk2+99 fyh g(nected 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 h/ .o-ml.ur hi(adw0w a 20-mH inductor, what is the iilhwo(u 0 ma/d-w .h.rmpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series withl c7vdfsj+ro c2usq*z+*x i :2 a 20-mH inductor, what is the phase angle at 1+sz lsdrf*oc2*2ixq +j:v cu7 000 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 nlfjhj-mq/ r otxp sl: 10+3z.capacitor for a tot1ln h/j -o tqxfs.:l3r+zjp0m al 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 isw,52v ud9t ivw needed in series with a 100-W resistor and 15-mH coil to get a to, vutvww59di 2tal 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 pujxg3ect ;5qlns .v8y 1t in series with a 450-mH inductor at 5000 Hz for a total imp 5. x138gnce ystq;vljedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series witi4hq,k 5*4wv*edmfi -crot; z h a 100-kW resistor at 1.0-MHz for a total impedance of 150 kWmv;5-w*qk*ei r4,fzohtic4d ?

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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 wit m:ws0l(mnir3);zg thl4-ec rh a 20-mF capacitor. What is the impedance at g3slm;rt 4whnie -0r zcm(l ):1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 8il3w-ou g i,dzrw ,xb.vbm0(k09rp v 10-mF capacitor at 1.0 kHz for a total imu lmw,( 3 drw9-i0bxok.vi0rpzv ,8 bgpedance 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 wy.5lzg .a)hxtrr (+n2 a; ulq1xvsv-,tct;jj ith a 10-mF capacitor at 1.0 kHz for a phase1).2 5rtsv; -;hx vgltaaqu,nr+ cyxjjlz.( t angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30i3*k;o x wjvphtfd17/ -W resistor at 1.0 kHz for a total impedance of 45 W1woi f xk3p/t;h*vd7j ?

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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 r codd8 qfoo+*+8ihn.with a 100-mF capacitor at 120 Hz. What is the phaseof8odc+ih o+r. 8dq *n angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 150u3wj 3j3crxg8 u2lph90 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec923ujhwlug8c p3xr j 3ted 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 resistxa hug7 z:pu-9)f(xmy or, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connuhxz g(y- fp:uxa m)79ected 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 inh1 m r5a4aac0hl-fy e-ductor of inductive rea 51fhchya re0a4 -l-amctance 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 rwox6m hsxjys0/0u+/n esistor, a 10-mF capacitor, and x yw 0o/s/jns06m+hxu a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with2f7xpc iu,1b 1+ h /wqujkp7cn a 500-W resistor for a phase angle oh71kqpx 1f2 / ,ccn 7+jiubuwpf $40^{\circ}$ 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:ap:shl 2yh q;*e /op5)yh rmo, C = 10.0 mF. At what frequency should the circuit be driven i2yh:5*sha): pol; yehr/ moqpn order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit+ b(afzi/usk u9l+ f8k+dmz1mfq / x-o with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to amlfs1/( zua/+k- zdq i ++ufk fb8mxo9 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 circu95by8(jpapoc b h-i) she2 cy ,/:k2xfop8fuoit 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 impedanc/zuj q-n, hq7dwcbzr)a 6d,:ne of 60 W and a resistance of 30 W. What is the power factzzqq7h w ,)6a:du,-bnn/d rjcor?

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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 1a(xy3 9wkpvfRLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when9f k(va1pyw x3 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 frj;5:7*mtwiiltk 4trv equency of a 1.0-mF capacitor and a 15-mH coil in series? m4it ttwki7j*l5 v:r;

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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 se w*+ ss ax;c,1my52rj3ibaisn ries with a 4.7-mF capacitor for a resonant frequenca j,c+sw2 s1x aiy5;bsmi n*3ry 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 )b.:e4j+2zz lk, jjkk8ru9tf h0cf lffor a resonant frequf:kr fu h,lb92)z jecklk0t+4z.jf8jency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 4iy9 ,.p (:.q4gc sxhf,hvdlys0-mH coil if the resonant frequency of the circuit gl f4,.y9qci h,xss(dpv.yh:is to be 1000 Hz?

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