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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 magneticlx/ 18) upnzfzqm8mi0d 9e pm: 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 kl.v-gu )is a76 e5zpwthat 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 wh bi.zs)oly mej7k5q 1gd 5 xxxti+0 iphvi.;,5at kind of change on the induced l xibhz.5ik 1ex57xs5g+ vmotdiyq . pji;, 0)$emf$, 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 rv,svqy,z6ls8d(w ln 4k*j i 2fojg-ll7rd) 1 magnetic field through a loop of wire produces what kind of ch7zi42vrf,j sgllv6on r,l)yql-kwds1* dj (8ange 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 prod3c 8cx74 th iohjd1bvtq5;la1uces what kind of change on the induvct;b1xi o714altc5 8dh3hqjced $emf$, 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 magn v*3qr+mcvx79bkmkxx0 ws ,u9etic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor208ql z j (0.wpuhxrkwk:io)j -xlw2i will be that which w0xuw 8hw:2izjqk2il kpr -0j( ).x lotends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above i k65.jywos8ox j:c86s0lxeg lts center with its north pole pointing down. The stationary magnet induces (.j 6y0l6kwolj8 g:ses58x ocxwhen 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 man )./lcyitjuba09/7e b+ ryhorizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnetu/0b a.erlynicym +b9t j)/ a7 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 :f: qgr lmo5wv9kpjq4j-:g4k magnetic field vector points straight up. The magnetic field ggk: :qmrp44f-: 9k5oj wqjl vvanishes 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 tabl .sr36-l bfgtjn(g 8df+ mlz7xe top in a region where the magnetic field vector points straight up. The magneticj-g6. m slfr+t3 ldfbg7 zx(n8 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 ta b;i 8/n 93)jlqk0o2cy4vgcal l3yu zynapi7.ble top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in)pq cyoy8 9n y7ilzl /nlcvagb 3j3;4kiu.20 a 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 carr/zts 408g* b(1n;.myu h+khpmecxdx2d pp 0qwies an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Whep8bhxnp+gy4 2kpwz.0qms0;xddc t m/*e h(u1n 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 loo:rk4;0hxbpcyrwke 2)p of wire with the north pole entering first. As trr:)2c;y kpkw 0h xb4ehe north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed a8 z*y)utb3acs bout an axis whose direction can be varied. In a region where a uniform magnetic field poib tzcs)*au8y 3nts 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 at constant angular agi9 0e9mz0sn speed about an axis whose direction can be varied. In a region where a unifo09gn0ze9s mi arm 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.6 r-hcc4e(h-wr vyxt/( q(yvywk0ba 4
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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 thatmg)3a5/7uczz qr( jq ,cmu7no 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 f +78pnpjpkzar-9.d )bj. 6iygx krbb. ield. 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 direction) is moved nku h ns)z9;,gvorthward at constant velocitn, u 9s;)zhgkvy 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 at a co-u5u9 xx6 m,ppku3va knstant 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 ugn r:v0fgh,0gy 3a)xtransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatv+1,c9e(iuqd b :0xug xdj/mmes through 60 revolutions each second. The frequency of th1m/ u, v9+m:x(0jdu xebcdq gie $emf$ 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 ucb5u dipatsk55.or6c au 9e 6;sed 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 device t.-n8;n rywdjx 5qaerirqo( 2 0hat

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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 4t fr2fjngu(eg2qe5 , contains more loops than the primary coil then it i4f22enr5q,g ufj et (gs 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 seczdy3l(1 2 xwstq9s7 psondary coil theysspw z 37t( s1l92qdxn 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, th5uy+gx vz 7+rhe 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 k4a:du53k*zu,wtwuy s cxh:k7. rmt +aar):g circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an induc iaa f)ob+-q2b ;ryn3ytor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the 2y boqa f)r3 +n-aybi;resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal tjd5r(pxw*f*, e t 7oobattery of constant terminal voltage. At the moment contact is ma t*7 xdrpto5ewof,(*j de 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 / t*uv5op8lqe i+2c1x pr wc: cnfo/j7with inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resihzyme cz++:rsfzv q 73p7yl 2:stance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a ba)jz3hh 7e zhz*vsui+-ttery. The time constant for the circuit*he3z j7uhzz)v-+ihs 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 seriet6l4+:/ gd jcds+r tnhs to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit +s+dcdtt /l: 6 hj4ngrrepresents 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 t:sf+l:qx 6 b-yvuq c/khe 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 supply. On np5 5n6;:w:1zldzqjut p 7qwsthis 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 ci g+,gr2.nz4xchz 1zd frcuit, the currengxn+z1zdh, r2 cfz.4gt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changevril(q; .)fva4q6n bs s by what factor when the frequenc vsq(6fqvlrb)4.;a n iy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the indp xo me/-t+n6;k)vgq juctive r- nkx)+;etpgqm6j/ voeactance of 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 veozl10;a m6heoltage across an inductor approaches zero, the inductive reactance of that 0ozh6;a1lmee coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to aat06-5c9j me d kr b2e2jpwe;3dbgs9nn AC power supply. In this circuit, the curren c9t3dj2 29me5jgd6e - k0eanpwb; sbrt

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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 wmg , sjum4wpbsc/b l3w.82h4khat factor when the frequency is tripledg4wljh/. k823ss,pcmm w u4bb ?

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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 capachgz zd +q+h0vnb3a)z)gb zr.8itir0b)v8 z h.zn dhz+3 z)q+gabgve 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 inx9rz +d3:cur23pak6gqq)z,mx fyr3 q a RLC6+:2y3zg3kdum,3rz aq fqpr)xcx rq9 series 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 RLCru:oq */v 9ynr circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increases.gmfg zdj916olc 5:yz3 When is thiozf j 5c9:l36zymgg 1ds 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 circud9gaolu p zk)n:d /9x8zajj;5it 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 b7v 5.mvz tv-;rw -ckiincreases 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 capaci. /8buuc0qxp pot,oz8 f(4h*qv grvp)tance both double in an LRC series circuit, the resonant frequency of thr *fv bgp4v/8quto), p(zop8.ucq0hxat 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 drivextyr5(/kf vxb;m.7 qxn by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit oknqm(ff,-3xy* fclpt 3*q69xl( imvfccurs 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 in a l t;ij/3rcx4dn4 f d*duniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fielddl3; cf/td*4r xi 4dnj 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 magnn171 7p5etsjtx3 jq hwetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field ve7tw7 pej1q3sn tj5h1xctor are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniforaqz9 +hbm9 5i wgk*ct;m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of aw* h5z 9timcb9kq+g; 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 ychj 1*yr*j 0nq/e pess,pw.7loop 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 ;e:w ajtnbf :9opc3j)changes 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 d/k * f/ht8* n.3euq nhv5lxmz18 cm. A uniform magnetic field is applied perpendi*z//h mntexk* fqvn.l5 8 ud3hcular 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 verr f0 g ale.83-fo,ran 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 ar5u /l s(lc.ekm cre;uz2xc45aea $0.20 \; m^{2}$ 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 a faone9yu9 u ,qxz4;c8t a location where the downwaa u;f4xo8nc9uzyq 9, erd 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 is 2.0 m long rotatvep2z 4 igxl 5n rstb ()lqwm 5zo;f41uj;3tj6es at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mfxg)boz;vpj e 5ws61l litmnt 4q23uz ( 4r;5jagnetic 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 andkbyd;*8h, hqrfr,/n b l go7o5 a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists ofo5w lau kb*o(5 e4l atuc6bn-4 100 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 rectangskiy0y z 9/o l/atfx9)ular 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 r/izafols09 xt)/9 yk yotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this 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 widp;8w uw r-l3oeaaz3 * aw,5lzre 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 to9 :a5gvl 5 k4xm- yowlb4qfo2w construct a simple AC generator with an output of 12 V mwm2l o54ykab9woqx : 4fg5lv- aximum when rotated 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 gen1yqo h2c)fl8 cerator with 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 havt(g6 bypp)v +ye 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 m7 nq. r34siuei9pw c .8m3sbiootor operates on 120 V8risiw9q. smbu34n.pc e 7i3o 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 is connecte7,o1 cs. y ho7,ihqj4m smel -pvjy..id to a 24-V power supply. The operating current is 1.0 A. What ij-4mh.h7j7pi.,,i eo m cy.q 1ovssyls 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 iat i*d*ye 79j3dfwgd,s connected to a 24-V power supply. The operating current is 1.0 A at fid,y*wgtdj d793 ae *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 resistance 6.0 W is connected to av4+;c.1cm jpz 7h:7wtlv zhu i 24-V power supply. The op wmzht7 i+4 vc; u1h7.v:pjlzcerating 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 arh.sl;so; wneue.uugn31s0 *d5k .hto 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 ub*cqx+ay rey6 - cz9t4/:eegcauses 14 A to flow in the secondary. How many turns are in thee 4e/b:rtx +g9*cq6 -ezyyuca 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 necessarxj 9u ,7sc.lkcvvgc0 6y in a 110-V primary if the 24-V secondary has 100,skl cgx 9cjv6 c.u0v7 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and gcy (ejz+8d i 2bm5 z9y:fweh,a 2000-turn secondary coil. If the current in the secojc2 5:( y9g+zhieb8fmd y wez,ndary 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.xghyd:c55 ns( t2qm) d Assuming 100% efficiency, how many amps at 24 V can flow in the dgc)xt 5dqnm2:sh 5(ysecondary?

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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 7.wx8egpcxk5 4 nn3ha a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does txwcen3h4k.x8 7pan5 g he primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns ,(55dbzx.kdh gw vdh/on its secondary coil. If 120 V at 2. wzdhxb 5 5.vhgd,/d(k0 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 primary coil and 300 turns o--uidk19w,r ver7w:yl 0 tf lun its secondary coil. If -- d9uf,vteli: 7w uk1 ry0lrw120 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 tra wyp :k,5ahy8uwafb2 -nsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect8 ,2 h-uyw pa5f:akwby 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 0 +26eq i8-p:riit2u olmbexcits secondary has 200 turns. If the input voltage to the pri:l-2uc i o6qr8+b tmxeeip20i mary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tur evqr e4+bj)-1aq 8kamns and its secondary has 200 turns. If the power input to th m4bra 8 v1kqee)+qaj-e primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usua2u l.qklygfm5) d 8/helly stepped up to 4500 V by a transformer ang/2yllukh5m)8 deq. fd transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. cd:/guy:kc3io +*7 yxk56i zfidd7hn zk. vq7 The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W.d og77x+3cnfz76ih.qyk/zdd *v iki:k:y cu 5 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 cu)i-4d 13yl pw+aucxo frrent at 120 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.x u di)3awyf+lo1p-c4 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 t*x gwkos7fsu7 82i 7k1vhak+ votal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, t w*avx1+k 7s7o78gkv ihf2sukhe 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 el7 v4dmx-b3w:pf5wo0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage isd7bw f:54e3 w- polvxm 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 les7r 2 k7dnsk .q(uz(bebs power would be lost if the power were transmitted at 3000 V instead of at (q us77.b2kk(ezn rdb1000 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 c7f0mc2rgomi )37)u jyx9,rwx;vkoca 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 origina9 ) ,c)x7v0c7j wrkmfurcigm;2o3xoyl 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 hx/s6kk,xco *current of 5.0 A. How much energy is stored in the coil's magnet6 / kcxkho*xs,ic 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 contaqdt m;egld7n 3wfm4.tew.+ z7ins a 6.0-W resistor and an 18-H inductor. What is this circuit's qm ew z;l.mwe.fdt4d7n 7gt+3time 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 yb i:,xllsgglc 7e+:t8,gid8 h5ut y+pag8c5an 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 placed u.bh yy2 5e0l3owl;u il.l t(sinto 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 resbl vj *(94fjytstt5sx52 ban6 istance of the la9y*tjbl2f5sna( vt4j 56sb tx mp?

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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 power2 rhw3- n) xczfuzz.4mrt 5rp* supply. What is the peak current m-nr5 w 4czzhz3 rrtpxu f2).*through 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 ac power supply. What is the :a-vosx;i;v mds 2;lrpower dissipated in s ; roa;l mv;xvd-s2i: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 50-W resistor:p*pmwijd4t n ;l9f2qvgpe18 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 resi74wwj (huaxh z3gmett :y8n7 h0qm98sstor 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 50p.n ; vuephza7stk6k0+e7jl 2 -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 1.0-mH inductor at 60 Hz)b2w+:jled+eyju -tr ?

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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 reactan.d mt+1 az3iixce 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 indukcwdq:b;l8 43 o2v icrctive 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 ky8m ::iiw cn)v 3k:pd157 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 inducto2 1+lafs112xj rh7y mdjhy)nsr when 120 V AC at a frequency of 20 kHz is applied to it?sh 1ay2fl rj) jny1x+d2 m1h7s

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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 source?,v )rn y3sqs -2/n2cbpdr9/zg.qux ag

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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 reactance0sz80 j+q degp of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 Wvyl2g8 ,o w*-ron+a qk of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a rut l bkg0)f*)ca.y1hteactance 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 wil vx6g9jqwl4 7el the capacitive reactance of a 0.010-mF capacitor be 100 W?w q47glxe9v6j

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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 1000 Hz and 5.0 V?7jn(czdgho qnpj; t*fi1nhg( 5,9w6 i

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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 resistance, 15.0 W ir;3v2*0payy5v alvdw kr. a;z nduwpa20 dz5* 3yvv r v;yar;a.klctive 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, anh5w9ydk 0 0af fqqbq-)d 1.0-mF capacit)05w d -qq hkba9fy0qfor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH a8gzys xn9( 9c:6uuki coil, and 1.0-mF capacit:xk9ngy ai6u uz98(csor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor i v vsy 8e5 +n6w-x,e1ny-kajpds connected in series with a 20-mH inductor, what is the impedancen-y n8+a1wks, eped5v-xyv 6j 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 inducto,3q,jtmofiab k5e d e),ih02 jr, what is the phase angle b,5qeemfti3h,jj0o),d 2i a k 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 2s/v83vorbjt 6( quxdcc:j l3series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 150ljs q/c:j v 3ctub86or(d2 3xv0 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 followiwc jgj+ 8j4:oy d6j7sbng capacitances is needed in series with a 100-W resistor and 15-mH cj8g 6:+yjjjocbw 4sd 7oil 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 putx nod*zh; 2k/f z c0hy,vvkm; )h+ge-e in series with a 450-mH inductor at 5000 Hz for a total impedance z);;hck,*e vmh+- zxh2ndk y0g/oevf 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 with ob-w kkm8b8m / :hqkw7a 100-kW resistor at 1.0-MHz for a total 7:h bwqk-kmko88bmw/ impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is cy, a8 cb:vp n+xpy)xd;onnected in series with a 20-mF capacitor. What is the impedance at 1000 dp:x;bv+, xyp8 ) yncaHz?

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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 1;wgxqntsfo /02rtk.10-mF capacitor at 1.0 kHz for a total o1s0;gf nq 2w/xk.ttrimpedance 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-m .do:82rbo1hx wp cb-tF capacitor at 1.0 kHz for a phase anbrxd.o-th c1w:2 8bpogle 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 nee/v+1icz kw bn+e uqz(u-2 7wgeded in series with a 30-W resistor at 1.0 kHz for a total impedance of c/ +b 7ugw u+e(zvikzwe -q12n45 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. u c7; x/2ffxuu What is the phaseu2ux;cuf x7f/ 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 1500 Hz if a 100-W re enh j0 (j3okhzdx/6(ssistor, 20-mH coil, and 1.0-mF capacitor are connecte6xh/0 k3oj(sj dhz( end 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 10.0-mFl nx. c5lie4of6n17vemmr g74 capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 61 5x4leo e. mig4n7nl67vr mfc0-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 capacd) ,vi-:hszwde a8b*citive reactance 30 W, and an inductor of induc- ahv8i)*sz :decbdw,tive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circui;o +q 9oj.pkq4/d .gdenzhfd4t containing a 50-W resistor, a 10-mF capacitor, and a 0q4q+ze pj.4d; 9okhf/odg.n d .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 necessa( vh i fqh2p -p,bxjt09ft4td,ry in series with a 500-W resistor for a phase angle ofp,-t,q bhx jt f2d( 90v4ifhpt $40^{\circ}$ 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 = 22b: nn8 xwu3et/ g.bvqd-ku 5x0.0 W, L = 200-mH, C = 10.0 mF. At what frequency shoulduxkb d:x tw2qn83.e- bnu /gv5 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 and0yc9gv -xuf:hi gv62 ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wheiv209hu : x6ggcf-y vdn 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 circuio-c: /i 3oaqlk c/wr;bt 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 impeda fz +7v onns skoi1jjav3)-.y8nce of 60 W and a resistance of 30 W. What is the power fac ns1j nof3az.s+kjvoy -vi8 7)tor?

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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 50z6cl c7 nnr8x,-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connect8xc lncz,6r7ned 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 ca ei j62plqoibr(y9-7 lpacitor and a 15-mH coil in series?627ylirq o-9pl (bi ej

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonanlv0 b a+whpq- o;(v+1xt qi/ubt frequbli+1 0auxp(voh- t /+v;qb qwency 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 neededn x)d5 1gly)p f.sbqnz4t z31e in series with a 3.7-mH inductor for a resonant frequf p)gtensy 1q4 z)zl5x3.nd 1bency 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 rese9wr-otk 2/ rl n vg7o .fut+r*gq8a1zistor and a 40-mH coil if the reso.rokvu2t8g/n 7+ 9q* awtzf1lg-e r ronant frequency of the circuit is to be 1000 Hz?

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