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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 flux exc*:v6fsk c:mw 6 qjk79id up*g 21vkjjjept

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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 p .afc7dx3tn4btm56tyk:p* hstates 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 ofvn to xzxap592fk,1,-t fe -ak loops of wire in a coil produces what kind of change on the potx2 9kakv , e azn-1tffx,5-induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field thrm1pt4mritszb km5 9 ja z6u:(;ough a loop of wire produces what kind 4z maj(5t16b ; ktipmrmus9:zof 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 kind of change on zf57 :rl ,sp /zhyx:wzthe induc:z/h5:wp7z sfx r,lyzed $emf$, 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 fier 48aimp638nl.kpbo+ otv t .kld 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 zn6491mijn/lfqu79sh ju7 uz in a conductor will be that whl 4fsi qj n17uu6jum79z/nzh 9ich tends 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 j czpo1 m3*kgt 4k.9e8m v2txmheld above its center with its nor o4c.ktmkvg j328tm*pe9z 1m xth 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 table. A bari75r nxqyt m4nl /2p,s magnet is held above its center with its north pole pointing down, and released. qs425ry xmitlnp/7n, As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vectoryndfimglla q t5ye,12hy 4 8(: points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the indu824 ey ( fyla1g,qn5tyimh l:dced 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 fie )ymdt3xbw;t4)bh )u lld vector points straight up)43x)tybu lw bt)h;dm. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fieltpt,i 7;cf-ml d points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappear- ;t p7,fcmlits?

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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 tablete9uon0pm0s ibn1*a) ; nr4yw and carries an ever-increasing current northward.o nt9 m*sua0n bi0e;)14rpnyw Two coils 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 wire with the north pole enterin:mf69t -r:lh. f5gfz *fuuiesg first. Arfl uif.gs 5heu-6 z:9mtff:* s the 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 consta :cupvz gkq 1i*dy)l3;nt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's)q vkgy1d: pu;*ic 3lz 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 speed about an axis -)(4c * z9i evruoobklwhose direction can lk)4uz(-vo roe*bci9be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.rg;uc4 l)kd8zu/1t mf
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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 thah* ggg4ra8oy:t 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 magneticom2/ uni,a,f s 1;guay field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward a4szcc5o eq4pp0x g0 q.sl j7er;f+. bxt constant velocity through a7 z4rfl4e5 osqqgx .cppj 0 +xceb0.;s 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 rotate1*l1lw. /1e suhbo uqis at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfv o;bk,zy n31worms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The fr 5xlf y47na7wrequency of t47rflwynx 5a7 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 tyf;h0ezf6ll8 k1wk q b61z a8used 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 devicecr l y1/hqh1 bdcz8+7j 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 c53 saa0yevgf v vh.q4;ontains more loops than the primary coil then it is ahy5.4g0sfvvaq 3ev;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 secondxjsa m1 qn.o.0(x d.ptary coil then it 1t. .ads qpx0xj nm.(ois 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 pow9)e:4g e zxgmqer 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 civ+) -r8,tg2lug oqdnbauf*d0rcuit,

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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 connectpa z vtnn:s d25 tj7l0 pr1rh2rp1x*,xed in series to an ideal battery of constant terminal voltage. At the moment contact is made witpld5n1psvz rrt* p:htnx0x71 ar, 22jh the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connev .wr4i 4d *p2uu-kdpucted in series to an ideal battery of constant terminal voltage. Atdpi rwp- d4*u.2vku4 u the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance Lrm mgl rmgpqj3;* 57mzd34*:kkzrd; j 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 tv*ayv:u vfz ddjb258o 6(2gyresistance 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 m0/wiqbcv0aga .zg, 2ctor are connected in series to a battery. The time constant for the circuit represents the time required for thebzi,g /gcv0a 2wq.am 0 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 seriegmzwqd n j8ax(k89f76s to a battery. The battery is suddenly removed from thed9ma6w( qjn8 f zx7g8k circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sameg+ ( jg0nhra)m f8m8oa 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 this circuyo *uj+b qrt mx -4y6pvh.ep01it, 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 suppmyf.1v 7lz *e9 ar-guxqax 3f6ly. In this circuit, the curren* gl3azx. - r9uem7q6a v1xfyft

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancempu34u1r:fb ;lc bkk-jy4(vs in an ac circuit changes by what factor when the frequency is tripledf-bc ;3smb4kp :4 (kluy1ur jv?

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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,a0c w pr*le5o- the inductive reactance of that induc -p*r05ew laoctor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the in dm-vmbum5os)9 g/6 pnductive reactance of that coil6b 9mnv5-)msm pudgo/

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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 u*3e(qx.g074trrqghu,nmou an AC power supply. In this circuit, the currentq g*ou m7 n0,rg(rtxu3qu.eh4

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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 wht 1 9g eznt/b50 *jsb;r1bnvhoat factor when the frequencvj1s b gt09 5; n/nb*bhtroe1zy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a cauh-a:sn c j84zpacitor approaches zero, the capacitive re c jn-:4uh8szaactance 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 in ak ph3rn21 aoq. RLC1. o32 hnkqarp 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 RLC t n d*3f vv9x*tmfu/5wcircuit 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 m0f,9(tfdm q kr 9*h guwjh-o0if R increases. When is this staterg f90mmhh0(uf9o d q*jwk -t,ment 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 circui7 9jja :g3kegyt. The impedance of the 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 series circuit. The impedance of the circuit - n,hu+diil(d o2 +fx8qn i*gcincreases 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 doubwzd+grgvgwre7 t 3y7 gc+9 74yle in an LRC series circuit, the resonant frequggt73v+ wgr ye94c+7ydgzwr7 ency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is drivj dl iu9q/v6xm u ;f6(hw)yws:t( p3qven 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 RL3c; 3abz ,u1ledkx/- u nq9kbcC 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 rotatingo t:(jkou,dnv* fm)a4 in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fieldfva* u,tojdnom k:4)( 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 mag4 3bq/el1tboaa4) zdtnetic field of 0.20 T. Find the magnetic flux through q)daab /bt 4 zeo3l1t4the 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 is rotating in a uniform magne;s c-izcawi8uj ;*,6 xk8zkcntic field of 0.20 T. Find the magnetic flux through the loop when the plank* az8 6-;i,ucc 8cixsknwzj;e 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 a*xx/sk5jxt008u pw kqdjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil change(kp) 7ohrfihl e: )1ctju.k r8s 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 20p c/2csbwqv(nu 6f;*d 0 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the aver/dq *fc 2bsv p(uwn6c;age value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area o 9ysype07)f ri,30vs rjstbk 4f $0.40 \; m^{2}$ 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 mngz5qzd t.o7 +pu-0j $0.20 \; m^{2}$ 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 mif a7nqzpm 90nzzr0d,lf*11r flies horizontally at a location where the downwa f pi1,1zdzm70n*fanq9r0rzlrd 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 rot -h.ts 8hfq-bx;bomos 9ck +z4ates at a constant angular velocity of 2.0 rad/s about .bqc + --t8x b;hfmok 4os9zhsa 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 5pq+fkfbn -wn93cj-c80 loops and 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 ozt+ b)l52 bpeu7u.tacf 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 armature. z1yo(hv rpi-i t 0wk,3 Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis par ryz0,(h iokvw 1i-t3pallel 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 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 turnsd1.w gpd sfv/;;gxu6 +ycpeg( 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 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 an3; bymqq x02jsrl2dw/puse92r tt *:w output of 12 V maximum when rotated at 60r* ww/ 2 bp0msyjud9x 2lt3;qs2rq:t e Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator withjyoa, plz1r/. 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 mojmxnb.)cg 4td,8c3 i stor have 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 id 2; 4fogigq5(hpmpt1e.3jchave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fullg (qhmpce2 to.f3d;ig 4pji15 speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V ,,ypj 6ja y:ga)a 7fwdp:ctprdk927a power supply. The operating current is 12jy96a,kt pcg:d7a d paajp7 fwr :,y).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 w/ b3 v, m1bs:r6vjueb6.0 W is connected to a 24-V power supply. The w,b6vmj3u :v r1esb b/operating current 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 z x-up,rwvf8c a:9d3 nb:c7fnks,a. nconnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacc3:a dx9ka 8, ucp.b:znsw-vnrf7 , fnk $emf$ 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 t lq968fc gca:;i.j whbo 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 primarol y9 ycye8 .g9v7m /isk8n:ohy of a transformer causes 14 A to flow in the secondary. How many turns are in the seco 89 :meyihvkon.g8cl9/sy7yo ndary?

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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 prin(( f wprm5(iyzvi2 kgmps6)5mary if the 24-V secondary has 100 (mpw)6kfv 2s5 rgi (mipyn(z5 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 a 2000-turn seconda4c l* q(pm avvm9c9yu1 k2fnh;ry coil. If the current in th19 m9*kmh qucn ypv;lvfa4( 2ce 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. qhl)sk 0ofahzt)*t7a03c b( r Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?07t ) k)hf0zt bs(hrq3l*caao

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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 transformer provides 750iwacw*kqq0r u75w53lpg; x 5c0 V at 10.0 mA. The primary coil operates on 120 V. Whx*u pw i0lgqcr 7;w5w3q5c5akat 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 c ob)ecgh-3i0and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what veoic30)-cb gh oltage 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 is a +e*ri:hl;xe,tk+ c:tvwv-ts primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is :wae*+- +;:r tl,k isxhctevvapplied 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 an+8ug2ie- rwj i2hr5izd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outui-i zih+ 8e2rw2jg 5rput 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 transleny.vz3 o t//former has 100 turns and its secondary has 200 turns. If the input voltage to the prile .ot/vz/n 3ymary 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 turns and its secondary has 200 ylq:qzirer43 3a. 5 :mwxiheszk:.x6turns. If the power input to the primary is 100 W, we can ex4sei .::kzr 65z:m.yl xx3wqheai3 rq pect 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 g 1adcb; bk-tl.t;-seis 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 secondary if the primary has 200 tuk 1dtst -cge;.l-;bba rns.

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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 atth*0 ,q9 hc,khs9to vi;db6h vhzpr2. 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 powei 6 q2 hv,zh0s.t;tdv rh9,co9 pkh*hbr 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 .bhv6i2) a asuvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line 2i.b6)saa vu hof total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission lberh+puto 95m ll:w9/ine 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissionho+ lbteuw r:/m9lp59 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 hast- 7oxooqh c(n*(jzs 1 a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmiqo sz*xc-(ojo 1(hnt7 ssion 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 5xvv(m rnp:u6t /,6p)o acuj mp--mq0uk5jepV. How much less power would be lost if the power were transmitted at 3000 V instead of at 10u 5v6qm)e-pm-50rp/ av6pjpuotm ucj n(x: k,00 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. Inj.h c2qn3(u*-4cj jkymq0 qdt is to be transmitted on a line with resistance of 0.60 W. To what vo jq4ncmj3hcj0(. qku dn2*- qyltage must the generator 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 )ah5( f.n+ mzlv0btshthe coil's magnetic field?.bfzhvhma()0s + 5tln

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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,sdi/nf.cqh6 m. e4g7w9 *oqwg z;xfx-W resistor and an 18-H inductor. What is this circuit's time conx4gmf* g s;.7w/9xiqn,cwe.df6hqz ostant?

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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 A1vucb u ,4r5kgz6d.ivC 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 into a 120- zw ct251cnnx 18 n:dwjl6/l*jk7xz joV 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 ouw/ ji3n (+kbekjmb x)sv 74a3 -iubwv.tlet. What is the resistance of the lamp?wji7i.+w 4 3buv(k)/sb3-amv x ekn jb

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What iso 8yj.-u o2 wij*w9cyt the peak current th29tuwyj8 c *wyoij-o.rough 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 c39wqvc4jy 7ayyj d4t; onnected to a 120-V ac power supply. What is the power dissi3wy;jyv d9a 7c4tqy j4pated 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 50-W resisto4z5mydq9dr5 jr 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-Wlc/ v-*ehx1obi6*m tk o-iux nvf54 8s resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Wm7t ndh u(r3h5 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 vt,*i4+tjtst of a 1.0-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 coil au c/yl wyttg5fi4 (-czyr o9y7n cy:(9t 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 wilfle-,7w kl6anl a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactas4 hr ot2oh;:, ezifgba 348lf:s2hw ence at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a fre 4 6g 9fyyd2-b,s6mdpys y/gy-o-wkqiquency of 20 kHz is applied to 4/g ,b wyf-ssi6d--qyy9 doky6 2m gpyit?

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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 a9 /o vk3ju/3s4o4*xzuvnmwwn 2.50-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 reactav 9;qrbve.p9; w+-liokyqz -o nce 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 W of capacitive r 0,xdi y:cbi.;+pit)r h/fniieactance 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-mFjt995g u*cw )khfuvh8 capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mhohbq o(u o+-rbp*, ;cF capacitor be 100 W- ub+h,cb(q pho*ro; o?

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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 Hzqm ec2h4bgi1 q*kbl.d.v x.9s 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 resis/lj0r e:oein,tance, 15.0 W inductive reactance, and 10rj o n,i:e/e0l.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 4 lvth0p 3nuknlv7w 16at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor a67p4nvh 0lw 3 nlt1uvkre 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 i /v1by o o4nqo91of)y100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie/o q )fonyibo1v1y 9o4s?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 2rc/a,nj cf sd5qo4t) -2xfnl :0-mH inductor, what is the impedanceaf4 )oft 2,d nq-j/c5:scx nrl 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 serie b;pigyi 7h*2ib5xnn( 8 kc1jas with a 20-mH inductor, what is the phase angle at 100 gabyi hi2ji7pnknx(8;*bc1 5 0 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 s7vevviaj l7x6+5 p0bperies circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100al7+7pi vxbp v6v0j5e W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W ronl rxbtz*.b;g4c2 l v9i*,gqesistor and 15-mH coil to get a total impedance o9 bz. crixqno;tgb *lvl,24*gf 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 tj +n. hh8jp0pHz for a total +.0jpph hj8 ntimpedance 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 a 100-kW resistor +fj m9rxzw3ue s; er-28u/duw at 1.0-MHz for a total i3r9-u s/ ;r zdwjwumxee u+82fmpedance 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 conndb;y 4bl,(nap ected in series with a 20-mF capacitor. What is the impedance a4d(aby;lnp , bt 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 capacitor atm)b: 8 ycioy ogt,)5cvz owlc,l d7:z4 1.0 kHz for a total impedanct,iocozzd 8,54 7w:ml)ccov)by gy:le 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 10qf705h ifw(dm.5 jmj8op q. eo-mF capacitor at 1.0 kHz for a phase angle qdeqomj8 j( pm f.5.o5ihf7w0of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neede84dvm wwm- gth ;b/5vrd in series with a 30-W resistor at 1.0 kHz for a total impeda-h wvbg58;4mw/r dvmtnce 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 100-mF capacitq+ z 8bb* fgg8cfv.(saor at 120 Hz. What is the phas v8qg*(zbc8fb ag +.fse 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 ifv5-. r :.j65nh1aawuazbgb ih a 100-W resistor, 20-mH coil, and 1.0-mF capacitoaij:6v5nuz ba r.5. w hb-gh1ar are connected 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-i1v sge8fq;8yn m:lkw1 pec -r.4hw +amF capacitor, and a 0.350-H inductor. The circuit is connected11few;88: yqca4 iepgkrs v w+lnh.m- 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.hx-oz l xqazg7uv(ja :9y80r capacitor of capacitive reactance 30 W, and an inductor of induu8.az 0 9( raojzx7yhlqxv:-gctive 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 circub7s clygmn o- 9/r7ka9it containing a 50-W resistor, a 10-mF capac9rya7k7 -go/ncsbm l9itor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resist0 pwic372 q*u6miqe ovor for a phase angle of6qump07 c iw*32iev oq $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequrg*2 pt1z bwjvw u-:t91-irayency should the circuit b1--b:r tai9z2v ywgpju*w 1t re 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 inu gl:v. t4cm4:r1gvdje 4r9qm an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecrt944deu: .gm qcjr 1lgm: 4vvted 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 ci5i x8a rsc1g2c8pst- qrcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What i 9u)29*fnn lfgryeg s)s the power factoy g)2rln s99 f)*ngeufr?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W /2y;yy8q+mzzi fwy0o 13 ogd,crc w m:resistor, a 10-mF capacitor, and a 0.45-H in2omc1fz 3 m,ygy/:iyqow;zr 8 +cd0wyductor, 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 * 3z:w/r v cr6nh-i5v rdd-eh) rrwg4uof a 1.0-mF capacitor and a 15-mH coil in series?3c w/ednr ur)vvr5g4- *zhrwr6hd:i-

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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 capgvm uuyd.t9/f3ur 8l0acitor for a resonant frequency of urlu03gvu9yf. m/d8t 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a r e d(pz,t9:zzmesonant frequezm:z, e p9zt(dncy 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 3(q2w.xc tzw4u elh 4fx o,m)t-0-W resistor and a 40-mH coil if the resont2 (44w.ulxt)zowhcx , fm e-qant frequency of the circuit is to be 1000 Hz?

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