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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic ftqbl 0u- j(4aclux 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 inducxk hssb9im*2ydu00e.tion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil tu3nwy(qy *u n ey83mv.: :aw0kgzjo0 produces what kind of change on thenytug uyzmq80wo 3ewkj n*0 : :3y(.va 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 magneti0ipvyi fz7 8 ojt/30xuc field through a loop of wire produces what kinftupii80yvx 7/zj30 od 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 produces what kia nx2t5 ;)gx2rye gb4m to,y,ind of change on the induced x; ry ,xnt4 )gige5ty22mao,b$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fielyvftulgts8q--8;kk( n+uo 9 yxk . 4mbd 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 b) zw pu79/g1b(d(aj.j wqv nplaw, the direction of an induced current in a conductor will be that which tends to produce wh79u. / wb (vbag1j jn(pp)zqdwich 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 mh +m)sgo s)3qbar magnet is held above its center with its north pol +mshs)3g) mqoe pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizont9t7 gy:jr)x mfal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil,ftjr9g x:ym 7) 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 pxk7ml;pf x98vn4 m+oh7 xxf4magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the se9fop7xk;f hv+mpnm xx4l7 84x nse 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 jbcqdrh z1*9( table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current 1(jbhqrz9 d*cin 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 wher6j v .k+lk.dzme the magnetic field points straight down. The m.+vkd mkl6.zj agnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an eveieg a)s))mi7ir-increasing current northward. Two coii)s7)m)g i eails of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wiruk xawg6*)5 /qwxtb7; a+vvqte with the north pole entering first. As the north pole enters the ww; b7uta+ *vqxqkw )/5a tx6vgire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abo7et7dnc - sp/f bf92siut an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the indud ne 72sfti/fcps7 -9bced $emf$ 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 sp2;mc b3)sfqc yeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, whatscqm;2f)3ycb 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.54whf0w1fv 2eionj8m n/qyp3
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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(hgom3s c p-*m $emf$ 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 magne 4c5x0ys, i:gwnmz ef9tic 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 (ori*/ 9 ekfdjnf,dented in the east-west direction) is moved northward at constant velocity through a magnetic fd*,jefdn 9f /kield that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angul;dbc i)teb0i 9yg7x,oar 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 tran*f r 0v be, rqv/4-;yddxgd(pqsforms

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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 re dbx6 01bdq7xgvolutions each second. The frequency of the0db1 6gbx7dxq $emf$ 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 devicljhfx55 pyl4 ,qzs+g3e used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devicee4sr6 u -ndxprt0 va p 5eto7i96-da*kgglk23 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 t2(ftygn+4/xq y gjh0 loops than the primary coil the/f ty +(ghyxq0gn 4jt2n 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 p ystb7:r rfdpbkh-fgb,4e:l l6)cfa*0 u .y0vrimary coil contains more loops than the secondary coil thefy,gr fa.t: *)lb-rk04h:ycb6v0 f7l d beusp n 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 p/,1 0h1dnfipwt+ 4pf 4ikzn rjower 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 circuif;m u0twwk i91t,

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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 const)) garq-s jwbv0 n3vx3ant terminal voltage. At the moment contact is made with the battery, the voltage )a g w3bq3)0-svnxvrjacross 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 connectedpuul 2r0l322d w8 z2c/s qfanv in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor i zduaqflrl8n2c spwu/ v32220s

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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 ik r;r*brq;7ues 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 inductar5drjjw)pyldutz 82dnr;83 (nce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 connect iiug9;2toq zf )vlj+;ed in series to a battery. The time constant forvi lj)qi2fou; z; 9tg+ 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 a3,ofc1d wm sz077 qu tnr4 wc3jy:oy(ere connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for thentqy47c o3f3,(mwjeo 1u w:sdc07r yz 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 hacr z4m5pz7kb tq 6pis zo6t(2,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 A3ubrpf8x(b-q gp(h3 jC 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 conneyxs 0vvsmh(0ucx 7b )45 gna1lcted to an AC power supply. In this circuit, the currenmg sl70x(na 0ybs4 v )5cuv1hxt

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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 acjw19birbe gp 3, v:,lr circuit changes by what factor when the frequency is tripled?wlv gi,r 9p3r1b:j e,b

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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 volta(lj en+vm50smk y /s)ige across an inductor is doubled, the inductive reactance o k( 5e/miljs0y+mnv )sf 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 approa)/b rssb zy, *0z9jkcmches zero, the inductive reactance of that c rsymkj *szb/ )0cb9,zoil

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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 m1(td5l7j .mrw8 row9t-yqpj. In this circuit, the currer q .my5-wtoj8rdmtwl91 7pj(nt

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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 w6r 0yu+iyn: 5 qv 8yvtbxz1*zihen the frequency is triplzz v10yn 8 y*b xqy+rvti65:uied?

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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 capa zi86y9a p(n lzdv)ol2citor approaches zero, the capacidla9zl2y)o8v6zn i (p tive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor iwer- h,f 87n,pxa3q, 7bprlfon a RLC se,rq-fxhon peaw lf7 87rpb ,3,ries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is xd).kp0l(sd -ykqbc4 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 circuie. iaa*eqsf+o.6 jzj1)db8 get. The impedance of the circuit increases if R increases. When i.a8 fb js)gqdoej i61+ez* .aes 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 inceac * 4,/kgaeou iult7aiy/; f atj10(reases 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 circ,hp6 o7jbmfsc6j3 b tbp:n00xuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, thu77n2whtnd v6 e resonant frequency of that circuit wil ndnu t72wh7v6l

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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 anim /+trg)bgn87( jwhe 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 series5y1ic tt-af; 5vyuvq, 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 rotating inodgp*; mxq.z, a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vec., zomxg;pd q*tor are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field a c-gsj01a9luw w.t))+5g.p ojigb zaof 0.20 T. Fibj)0 o9wc 5a 1-z+agtgi..gs)ujl wapnd the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m ik4 lx43 m6pnris rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux t3lnx 4 i6pk4mrhrough 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 singlg,m /6g-ry)qb:c sjxle 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 chanjh.(cxwa4k / rplhd *0, c+fiages 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 frame with sides 18 cm. t-bjxrq./ih3u sfe 2:A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changesbxr ji e3q.-2:hsf/u t 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 15xmef7/xi( 05tet yq eu4 h-2lr turns and 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 and a- aohrk f4l/qecj rg xln74*+,7ria8vrea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where thp03imt /; b ,u6lf;b3cl7: oiibnss oxe downward component of the Eb7 bim;np,ool3 6/sf ctu0;ix3si: blarth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long ritinf3q t +n-hm -2d)wotates at a constant angular velocity of 2.0 rad/s about a vertical axis through -3td+nqmwit)f2 hin- one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a zr/px 5nzxv : )u19ex(xag3crcross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of areaba gdq*ferj4jvm oaj1.bz7+ nq/:j tu+64v(f $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its a,.f3 c7z op7ivpx;j ovrmature. 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 ov7;,v.oc xj3fpi o7z putput voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of areaop* zowu7 gibs ,rj1k++t0v4kt/i h+kmf7k2l $0.090 \; m^{2}$ 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 constrg 9wtf .l1eu:3:mugnm;3h gmbuct a simple AC generator with an output of 12 V maximum when rotated at 60 H1339gm mf; : ugeugw:bhm.lntz. 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 w-6g v i:p3,q;x jvst1v;unof jxiak 3br8fw1,ith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a r+6/nsr zlw.mresistance 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 a76 ,gk5dgro:c 9ttfp w resistance of 6.00 W. The motor operates on 12 otf95c t6gw7p r,g:kd0 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W -9w+ glzea84w, vnodr is connected to a 24-V power supply. The operati-awgz9dr+l8 oenvw,4 ng current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2exax1 g4*nrz dx2b dz3,arz9g+lg2 n74-V power supply. The operating current is 1.0 A at rz x2xe 24 z9ad1 ,dng+lzg3axr*7ngbfull 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 resistance 6.0 W is connected to a 24-V power su*wz . zsmxv 6yc*1mualb1m*h6g60ber pply. The operating current is 1.0 A at full speed. Wb* msg1yv.*x w6l ea6 10rmuzm h*6cbzhat 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 uq6/2f fyb0wy is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow y0+kiggyst 4 .xe i01xin the secondary. How many turns are e+xkxyity gs4g.i0 10 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 110-V prdh;rng 9* rd)ximary if the 24-V secondary has 100 t nr;xr *)dg9dhurns?

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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 secoo5y: hwbov b3q sd2db4 7m(c1wndary coiq ym3 (o7o 1wds24d5bbw h:bcvl. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Aa sijzs9 f)1otz5e-w4ssuming 100% efficiency, how many amps at 2ze) s4zas1 9otw5jif-4 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 transf2 h8 7)ongodxuormer provides 7500 V at 10.0 mA. The primary coil operates on 120 V.oh u8x7n2od) g 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 r*2 oxpz:)tafcoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied z*a:p2fxto)r 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 60o1y 3(0d6hykbxu fy9 t:(:jlobzjg5.caqrd- turns on its primary coil and 300 turns on its secondary coil. If (6ld:3cod jk1yo-jqy90b fy(:zux5 a.t bgrh 120 V 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 trans+up1 )ih7h +w5vl ntgzformer has 100 turns and its secondary has 200 turns. If the input current at the primary is hh+ g v+wpt1i)5z7unl 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 secondary has 200 turns. Iff 8+pg3u4jl ma the input voltage to the primary is 100 V, we can expect the output voltage of the secon4l 8 3p+ajfumgdary 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 anjdv .d c3u*8osg rb2:ed its 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 (neglecting frictional losses)r.uveoc8j* d d32 s:bg

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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 uh38 oz j:yddkft(ru:9c nndv) 5/sqd/sually stepped up to 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 th5/9hzf()rj 3q 8:c uvtdkdd ds:oyn n/e 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 usuallyzrgv/9 7(cn ny stepped up to 4500 V by a transformer and transmitted through a power line of tot(n/ c7gzryv9n al resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usua(dvrmhz0v6(dfgsjb uu - ;+iy. 4w6qslly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 +(mdwfu60sz vur6q;-is by(h.4vgjdW. 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 9xup* yd/o9o jhpt7fr*c 3uc )zj9it; 0.60 W. A generator produces 100 V at 70 A. In order to r;c*/9t 7 u3z*uc yjp9jforxi9d othp) educe 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 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 resistannjrr/ ;j4irt66rti xj..-gwr8 /yfloce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1tjgroxjri;fw r6t/.. y r46irj/ n-8l. 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 les12uf rw q.wyg1s power would be lost if the power were transmitted at 3000 V instead of at 1y2wqgwu 1 rf1.000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a x/6p k gi+xqe:e;0bga line with resistance of 0.60 W. To what voltage must the generatorqxg x :a 6+;egkb/ep0i 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 thg(wgu6q1 y-hsqyf g83.-w,fda(ccq xe coil's magg f w g w3q1sh qcy.-qux8d(6y,-(cgfanetic 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. bsc w4dt2r0ig6 y5 5y yw:ahyyz,(a2nWhat is this ci6a y 4yyahd5z g(ynw:s5t 0,y2iw c2rbrcuit's time 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 tzt/ff .1- -zep(inra mhe rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak6s bdvxd (,;puq6j lq7 1*uord3y kf+c 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 re:i armtx(u7 , vg7k;wwsistance of the lamm w(x;gu :7,7travkiwp?

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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 suppq5letsb sv aq0t/ 9fpzk-:t50ly. What is the peak current through the resistorz0kq l -/stt0fesp 9 55:qatvb?

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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 supply.ub4vq9tb3). skj*p, aa t3dci What is the power dissipak,9 qt 3dj*si pc4uab3t ab.v)ted in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a rz0np tjg,/5d50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resnh r2uhwwj /r /(valp2qy 1(3zistor 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 x5 yq krfc,bl.6 s;bs-h3kg8yx. dk8aa 50-W resistor 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 uw;:z73 ;xzvcejnh6 rjgy(*rb e;6wy1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH )n(vbs e p vb,v2u6db/evv099u pl4tp n b.oh3coil 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 14.08zjntlet4);* mg .ywu W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 100sf-lpjuxq.e23p q5r10 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kin+f x1u /oq(dHz is appli/n (iqofdx1+ ued 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,4 *, o ,wcmkwbhym/gu. 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 koj 1n93nl nd.m250wgb5(oigx v/mvl lHz?

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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 b;-fpggu+x wf4cb31b 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 capacdw z6t1r0:poeitor 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-m 4m e j,1;5qalviz2;9akwyfxhF capacitor be 100 W4il k zfaq5w xmj ;;y2ev9ah1,?

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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 capaci f0 xet:juw8;-jm nk;otor 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 W lfwi 9e,c2tq/:)zrqk resistance, 15.0 W inductive reactance, and 10.0 W capaciti zk, rlw:2 fcti)q9/qeve 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 impedp+tdgv,3 8uqzriu4;e2pf t t; ance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sertgfe8 3puzpuv4;t,+qd r;it 2 ies?

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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 291jssx ayc,iHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are con,jy2cx 1sais9 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 ism)..v2eaklptqsio22ybw, yn 8 t1y 6n connected in series with a 20-mH inductor, what is the impedancelmo22ates6,py y.q8v wn21 )yt. kbin at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH in +m.d*huasq i7ductor, what is the phase ihm7 *+d auq.sangle 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 capac 4erwiox:8;tcb ez)4ct8a;ejcu 3r;xitor for a total imped3 ; je)4 wc:;8e; 4i ecbtrxoxrtuz8acance 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 jzric)m* +/gbmfjh5 w0kb9.lin series with a 100-W resistor and 15-mH coil to gm .rfbm/ 9whij5 + j)kb0lc*zget 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 q6y 54)sjiznnl bc5-g 450-mH inductor at 5000 Hz for a total impedance ofsi 45n5ln-zjg)y 6cbq 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 s*rg9ifh i 39iseries with a 100-kW resistor at 1.0-MHz for a total i*g9r3i9 fihi smpedance 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 is the impeg15efdsdi4/rum4 6 fzl u ka2(dance at 1000 Hg/2z5fsralu4f e6d4i1 ( mkudz?

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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 serieqjyi.wq,22 et r8 cj+is with a 10-mF capacitor at 1.0 kHz for a total impedancerqe cwj 2t8i2q+,yi.j 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 1.0ujd),2vv -q z k+vd)-* kfopvs kHz for a phasedkv-z q+*)dsvvp u f2jv-) ko, 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 ap-4+z;kif rqm/ nn h+zl z+(ms 30-W resistor at 1.0 kHz for a total impedance of/(n+iqn+ l-fmzhk 4+zs; rp mz 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 120 Hz. W7ayk--4zefdh+ wr/qohat is the phase angehd f-zwy7kqr+ -4/aole?

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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 1 kegzt8j naz .7vkrh*,x1 49ea00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in zt h89n.a,z1ake7x4vgj* erk 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 resilqn/ 4w0y k.xvstor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is c 4 lkqnwyxv/0.onnected 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 capac1 g4wf9zc*v r:ac9 yenitor 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 currewcyrn 9c *z:a19e4gfvnt 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 circqevc,swqvpk1z 1 8ma7 j68f*rh00y s duit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when m8dq0vf 7h*0 v6skc wa1jps qrz8ey1,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 with a 500-W h)ga06 val -zlresistor for a phase angle of 0lvh) lz6 -aag$40^{\circ}$ 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 = 10.02drcby w 6y;fhz-mn *gis 2b; ;cd7e5w mF. At what frequency shoul;wz f yb7 cg-m6i;dynd;s5c *brh22ewd the circuit be driven in 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 with 12.0 W resistao4pb lc65/a4rx t(f toh5o4z+qgw6f ance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whew b/x4 coop54hg zq(oaa6ff+4ltr5 t 6n 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 cyc+(lqg 073 d2 pamsf*lvjos 4ircuit 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 hasi as:qmi1y)1 z an impedance of 60 W and a resistance of 30 W. What is the power f yz1sqa m)i:i1actor?

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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 R:j 2au;)48ob, zpve(*o w 3b pjigzujiLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0 ibjez iw;o2 pu vpju* ,ojg(3a)bz4:8.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coilry6ed :plad a 7*dv74m5f/eim in series?e 5am77dyvdr/4 ipe a:fl*dm6

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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 capacitog q/(0spvf( x lhnm)k7r for a resonant frequency of 10 kHz?/m h((q7fskvxgp 0nl)

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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-mH7h4ydrxw h: z- h3gmtd3.jz*y inductor for a resonant frequency of 1000t.x7r zhz*3 j-4:dyyd ghwh3m 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-mH r 5jmswab/6mgrd9r j/ o u81b a0c6k4ecoil if the resonant frequebrcje kgbr 8 a 1//a0645owurmdmj9s 6ncy of the circuit is to be 1000 Hz?

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