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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 magneticek1s( 17bsdlmswq 8qeh k7g//1.ityv 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 s7qxluwuc9g,z: dr 7)6 mhboz8tates 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 suyx3y qg34dib.( yu+coil produces what kind of change on the inducyd y4bq +y3uixsu.g(3ed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic fie(zu5lnebje q.u 67 /3i qa;u1pf,zhoeld through a loop of wire produces what kind of change on the ind1;q zu b.ep3u6, u ef ioleza/jhq7(n5uced $emf$, 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 ioeh/c+b1)gz9. ier fof change on the induced giece+ .iorzf )hb/9 1$emf$, 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 field a puz59iuqx a6uj6k o77n $emf$ 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 infx;zspx se3(8ki: 1,rl4 c v .tpvgd-qduced current in a conductor will be that which tends to prod lk xpveris3z(.:s4 -1gd;,xfct8pvquce 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 ;. fsgfk; 7roa)yf0 4okenu3h 4sp)jpheld above its center with its norksah)k.yo 4ueos7fr fgn4pp; 3jf0;)th pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table0 )yh1cbc xe w1 eses(x4-mvn((lws; s. A bar magnet is held above its center with it lsh;y( se1-xv(401xs w sece) mc(wbns north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in f3v fr.pxsda,0w4 w.va region where the magnetic field vector points 4sx0afr fwwvdv , p.3.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 top in a region where the magnetic field vecty zk97we s4pxh;8:llror points straight up. The magnetic field suddenly grows stronger. When viewed from abovl8;l4 kzx hsr 7p:wye9e, 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 .ll5bt-lzqrjs:l(r */ jyu9szt c1s + 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 this b-yul.jtzjl: lr+ scl*1 sq5t9/s(rzcoil 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-incedb o,,/o/xbl7,qzt kl :ij*hreasing current northward. Two coils of wire lie flat on the table, one on either side of b ll ,odt,:zh xbk//e, j7*qiothe 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 north p4a8rg .+kc:4jgum l i,v+cjhvole entering first. As the north pole ente,gum 4akgc4+h 8l ijr.v+v:jc rs 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 about an ao /e7dgk2 m0js2dv f,sxis 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 dj2 2 0o vgsfed,/7kmsinduced $emf$ 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 constan*1c9y .l)( u*muscznbb r s/gw5u-swjt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the osn. z5u/ bwym 1 j*gcsb-ul cu*s(9)wrrientation 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.qmek6 1er-o/2yy.t x1lks, f+ag n3sz
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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 --fdq3jc ubt;rs a0, wthat 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 awfr: 7e oigs3/tja. mrz7je:4 magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in th*r uhfn2 wl.4g/ctq)r e east-west direction) is moved northward at constant velocity throu rgu twr4q*fh2 n)c.l/gh 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 constapce :nk.e:/bh nt 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 transformsr8 hcia06e8cegpr )jtskz0vt ix n95(1fm8w0

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotate:- k ipjqrn2u4iy(1eu xx k:jv4kwe;4s through 60 revolutions each second. The frequency of t( iikp 41 u4y:uevqwe kxj4r;jn2-xk:he $emf$ 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 7d+d3 7/ fvd:il lzf6a0zn q mmi3-ysyto

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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 dejg u;gp3) x;(we*97 ckfhmvttvice 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 con-pp0ts0 s(c .qbl5h76 9bfi4frefipil contains more loops than the primary coil then ir 400p5f6lbpi-e.si qcbnfhp9 (t 7fst 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 containsntmwtq 31lpo/p7 hz)pc bz b:0u(q87k more loops than the secondary coil then it isnch(w8b7k1m)t pbp 307/o pq lu :zqzt 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 pkjf* /o-2-n.xievc bwower 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 resona7trd g0m 0:m1 un6z1c 5 jdvr*r.btvwqnt 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 inductor are connected in seriest ) vk9itzd5r3 to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage ac t3)vkztird 95ross the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in serpqkq; , aihz.80 tgs.dies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the indug08.iqsk zh a;.p ,qtdctor 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 co(tqw hny9(,bwihgf p toh0+ 5(nnected 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 resistakt 0nkeqptvm )53t)g.nce 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 indu r9fp p+qba y6u59edfv0h pa1:ctor are connected in series to a battery. The time constant faaf5 69pphr p0y1 +qubd :ve9for 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 bukqo0, ;woba )k3qm c*attery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time re3uwabk;mqk ) q,c*oo0 quired 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 exb,pzs ed:l85ycept:

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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 thy.)eqo;gklb zpd28 1nis 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 i1 d8 )d8lgls/g+3x fz h rkl))hbbov7this circuit, the currentg i )sl x k+hd7lf8)gb dh/)bo1lrz8v3

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanwkw(1xy(8k pi ce in an ac circuit changes by what factor when the frequency(kwiwx y8pk(1 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 inductixw0ly;fa ) ah(ve react al yx0;)(hafwance 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 voltage rahhmswh):(9top a77 t)w(g v across an inductor approaches zero, the inductivehvsh 797(aapw (o ghtrt):)mw reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC p9l ntehkq4+(:t +z9u2qwrg no ower supply. In this circuit, the curreh+tw9n9zkrqg q:lnt +eu2 o4 (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 6lu tt v m17d)orgc(4l4dvk*tin an ac circuit changes by what factor when the frequency is tript1t 7r 6m*v4lgc 4kolvu) ddt(led?

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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 a6etfe, cz3-u7kt 30 vdghtn0 rpproaches zero, the capacitive reactance of that capacitoret eu-v3tdn36 rkgt,zh 7 f0c0

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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 b u7b w20dmlk,ao;( ynof the inductor and capacitor in a RLC s2;kdwlb,0o7yma (ubn eries 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 cb je+fg( 1rfexwqya;65xx+e*q s2 k,oircuit 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 i a+hez cl7jli)7 er06td 1mr5vh1ab7w f R increases. When is t0vhz 7bde1+ml )tr7hjai 1c lra6w7e5his 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 th2,slhnob o2 r9u,ow 8,i,mphz,3e fnve circuit 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 serieiqzc7o::lhq1yr 1gg 2 s circuit. 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 Lq6a:aj .2u thuRC series circuit, the resonant frequency of that cuh .utj2a qa:6ircuit 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 t:lh. kw0ho3iapplied 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 occ*b0loy;*7 wpq wycaq(urs 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 uniform magnetic field of 0.2 y/8w* z8gon i(udf7u/cjxjs20 T. Find the magnetic flux through the loop when t(iy8xu*sdj jf 7c zn/8/guo w2he plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a un-7e gns6 qeyj98wvs *fiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie8qejgyf67ss *vn-e 9 wld vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatin xh1q6 q68 (kks3zjkdng in a uniform magnetic field of 0.20 T. Find the magsh6k63 qnz 18qkx(jdk netic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop 2wgw w2ul l83cis 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 chan p;k88ffn)clzb j*:uoges 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.i*7s.) p4v 0lutana 4le9xhoz A uniform 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 vaxa .9ps v4nozih7l0e )luta* 4lue 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 1bl 7pd5rw8n)zxg2 gh 15 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 area 07+ zd6q*fh1n vgwny 7vt:j qji4ik6 p) 4bcnk$0.20 \; m^{2}$ 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 horizonxotim9dehq,k- 1gfier za5 9r67ju:1tally at a location where the downward component of the Earth's magf gzdh67a ktjxq9ii:11 5 ue,o9rrme-netic 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 rotates at a constant bw2n 83tkdt c1angular velocity of 3ntc 82dw1b kt2.0 rad/s about a vertical axis through 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 cross-sdc(fx 9i- vju/c,d:2 ibvbq.jectional 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-5+h nrhje n1c of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armatur1ajtwsc n:bu jh xz// 9/ dgl;*.kk4uoe. 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 iu/gkn*4/jb9 .audjh tc; ow/z1:k xsln 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 wire of ae7f( t 3rv* +mgw+hnobrea $0.090 \; m^{2}$ 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 o9:e :* pdccly1 jyde+hutput of 12 V maximum when rotated at 60 Hz. A magnetid* :y91ph ed:+ ceyljcc 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 gener el:x3 x f5a(4:poviye *at- zefc8db2ator 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 have a resistance of 6.00 W. The q:wglxkyw9l8+qw,rm ) wk.8m4o6n gomotor 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 motorf(, /+log5xmyh4zwgp operates on 120 V AC, and when running xy,z5gop+ / (mghw4l fat 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 res- 1gmsoyg8z 5sistance 6.0 W is connected to a 24-V power supply. The operating current is 1.-s1mogz sy 58g0 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 24-V power supp,xggsox4b,xtylbo 7m3 ac 2) 0ly. The operating currentbx x, 3,2s7ob4xgtol0y ma g)c 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 resistance 6.0 W is connected tovioi6ofgbmv6 16mhl::2h7 c q a 24-V power supply. The operating current is 1.0 A af26h:b 6hmq 1co 6vii7v:lomgt 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 transformerix w38. ,pxpa*pvhl y8 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 in the segpy6ak v7j4xt ,vqg7 5condary. How many turns are in the 4p5, gvtjyq6gvaxk7 7 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 tu74ds .1yfaoxjrns are necessary in a 110-V primary if the 24-V sejys f4x.a17odcondary 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-turn b1o:b,m0 c3bv) g8 qbeu+gqiqprimary coil and a 2000-turn secondary coil. If the current in thqqcbqgbg e0, 1+m 3:vuobi b)8e 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. Assuming 100% ef w73v, 2c 7b:jxvcf(hnntpdw 03z9mvaficiency, how many amps at xv zt,wbv wc(v:7jn3fc07 2hd n 9pam324 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 ; t2tns.daz 4ebbib6(a neon sign transformer provides 7500 V at 10.0 mA. The p6a(nbzd bt4ts bei.;2rimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seco8 h52ipruyfn :,:ffq yndary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the second funf2 i5r fyph8y,q::ary?

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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 priwsfa fr/j12x1z4ob er9+8 ls*1crm r imary coil and 300 turns on its secondary coil. If 111bw8* r9/1jff z ra cirsrmes+4l2ox20 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 transformer has 100 turns and its secon7tu ba4ywr x*)dary has 200 turns. If the input current at a)wtu4xbry *7 the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and ite 5he; +hle-,(kp da*pse3yers secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondaryae-+*p eyr3 ep,d(e ;hsl ekh5 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 1fevvuyefb/q 4/m8 9 e6p+( lhz00 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power ouelqhuf6/y+zp(v/f 9 e8e4v bmtput 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 aq )tmxd *-z9dn(pzf jr8:-j ist 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. Find the number of turns in the seconx(zprm*nidd jz-8f:9 jt) -qsdary 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 j usho:aj,6h9 at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a ph :sh9o6,jau jower line of total 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 6l72*jp dyr3 zcvu, bnof current 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. Find the percentage power lost in the transmission line if the voltage is not steppcpu2l37 ,z6* yrjbvd ned 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 resi4-vvcxj)s* q9kis z/ zstance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmisz)v s*z/cv 4qjs9k-ixsion 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 im* zxrfw):9 hhas a total resistance of 0.60 W. A generator 9mihf * :wr)zxproduces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be *g( znxzk.qu y6 g 35xd4ujjq:lost if the power were transmitted at 3000 V insteauy4gdg3xj.:knxjzzq q 6( 5u*d of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It izb, p9/hgn4h2v 6r3pgu fr ,pss to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to e6vf 3u2gp,rhp94/,rgpsnzb hxceed 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 thelu/o ifffpi w2g)2++ax x 3k:b coil's magnetic fieldowl2 i f+b/fag u2ix3fp) :x+k?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What isck aap6syuyc/.8u 0, g this circuit's 08.s/yuakp, 6ccaguy 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 the rmsa )*rl 2aiail+ 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.hs+s abek-d 9 9s;y pl1jk6f/c 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 thef)p(hkdsfky3( j3k:l resistance of the lamksfhd3kjy )lk (p3(f :p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is conne 2j8:ohgp 2tey0z-3*gd iiwb fcted to a 120-V ac power supply. What is the peak current through the resisto28jthbioe0: g-2y gi p*dw z3fr?

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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 supplob if:*hn3/v-pi r/kb y. What is the power dissipated in the rbf i n:v/p3iob /*hkr-esistor?

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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 5j3twi- xrh(cis $I = 0.80 \sin (240 t)$. 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 resistoy1mlc, c0mdx: r8+kj or 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 resisbg;ed1 ;s8 nnl oszy)0pq:3futor 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 inducal rgm i vg.9pkmrnh,/ 8zk-);tor 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 reac/j d2+d1 jz9jhktci9ytance 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 ;euuy ebdu t*/8j y.r+coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at obpv;h). z64 tpg(cqibu /o :m1000 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 173bq xxe w 0us2etygv +y+*nsof 20 kHz is applied t s0tbe 3 wg qne++xuvysy2x*17o 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 2.5,6ki.m h2tt 22 xajmqq0-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive re whbkf9.dpc4 ;-dedjwg ym+:6ryi+wub -p3/pactance 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 o f07 8ecblz5cto have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance ofnpr6+(/3ft2d h w,dtkz) fk ww 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 ro *c5ftx,vkgjd: g*izfvh - 2.eactance of a 0.010-mF capacitor be 100 Wxj.g- dvt ,o fkhf5zg v2:c**i?

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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 anzlw32s w6e) ajcm/o ln*pqd 1ka8x1c6d 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 resistance, 15.0 Ws gjq k i,3hpk (f4d2.bo6tee2 induc f64eko.ie hg ,tksj2bp( 3dq2tive 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, h/csf)k7oz, k0hj,y 5y 5aor s cqbh5;20-mH coil, and 1.0-mF capacitor are jrk y, / 05a c5y;o,)kbhsqhf5o7cszhconnected 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 coil, ank5 2ol i8c0eodd 1.0-mF capacitok odeoc520i8l r 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 is )dc9 8oufl8k(dska i++rd/ g27qp2xjvvt-c j connected in series with a 20-mH inductor, what is the impedance at 1000 Hc/9sx vgldp2k(u8t7c)ad2f8 ri o j +j kqv-d+z?

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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 inductoros5j:+gii 2z 1- fpnbz, what is the phase angle zigf bi2 jo-zpn: +s51at 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 20-3 p)s4af8o hgqmH coil and 1.0-mF capacitor for a total impq3 of)4sg h8apedance 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 followinx 0ua t(ly3+txd9v2 /hit9(th6ut cacg capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzl6 acx /c y9a+(ti9dthxt2t h3u vu0t(?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 50naj ,(804bqc2w wvts) etxth7 00 Hz for a total impedance ofv4 w7)caq28s nbwhtj,( x0tte 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 be0e nfiq6s uhoay2b0l z+7( .yh put in series with a 100-kW resistor at 1.0-MHz for a tosh7qoe 2h.y0a zb0 6n( iyu+lftal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitoyq.8 *,+gvlgb3 ng5/ l nalqjcr. What is the impedance+ynq3 a/ll vlb *cgg.,85 qgnj at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacxahdx g:n*8 9x-tc6d kitor at 1.0 kHz for a total inx-kx * t896xdhg :dacmpedance 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 ne(um/qni*/qngiceg28t .h 7 rbeded in series with a 10-mF capacitor at 1.0 kHz for a phaseig/qhgn7/8meq r2 (utbc *in. 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 30-W resistor at 1.0 kHz for a tota:ro 3i n)gl-eql imoq3-ig)n l:r epedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100gws( 5-rh;u er4noe(r0vk8i m-mF capacitor at 120 Hz. What is the phase a4(05uvmkew;sne gohir r r 8(-ngle?

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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 resistor, 20bc-4op 9ia/di w5w s.o-mH coil, and 1.0-mF capacitor are connected in seriesw b 5i9oi/cws4dp.o-a?

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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-mF capa q 3xa1r pvfuc43ho0t+citor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz prtpvaf+q1h 330xo cu 4ower 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 crue:yl,4 r8as3l zjb x:am e0x:lt 7;kapacitor of capacitive reactance 30 W, and an inductor of inductive rekxbayl: l7e3: u e;, azrt:jlm0r48sxactance 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 R zaflc3+ r;d)e+t-zz hLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indhz fe)3-adlz ;t+crz +uctor, 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 with a 500-W resistor fox j7cb:ziyou8t jfv6 ;6;muubs 4lv96 r a phase angle of6 4 : tj6oybj8su;6ucb;lx97iuvf zmv $40^{\circ}$ 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 =. *::hhul 7ubg qrer(6y 1qjhi 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred frh h*:6eu1:gr(yjr7b.ql huq iom 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 circnp5*ynf)i /k*so;tia uit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacn;pfin* tk)iso y* /a5tance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC8ddn.m8dqyv i6qi(n 3 circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit xw znuhtg.u6 4j4v)/,hw1rj ohas an impedance of 60 W and a resistance of 30 W. What is the power factorn)t.rx/o h w4jzuvjhg1 u4,6w?

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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 seriev egu+i*rz x(3s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powzx (e ug+i3vr*er 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 t*di3k u62ga+ m)(ht a,rd xgzfrequency of a 1.0-mF capacitor and a 15-mH coil in series?dggra ztmdx*a6 2+(hk)iut, 3

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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 clo) jxi76z;i oapacitor for a resonant frequency oxz6l);o 7iioj f 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 sepc0gddqvweix1pn3* h7r 2zcz+o 8h +1ries with a 3.7-mH inductor for a resonant frequene11 gvx8cdpn+ zq7zihp* dcw 20o hr3+cy 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 bcl 1+kbaar1.t 6ch m3and a 40-mH coil if the resonant frequency of the .a3r b1+ca1cb6hmkl tcircuit is to be 1000 Hz?

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