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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 uniz -t-x hoq4p5;x lj8sss)m e.rts of magnetic 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 that t0tbr r*l,( fb3bo9zb zhe $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kin qh2ut7bvlh ydk +mg6e+- )ai0d of change on the induced hmg2- li +te)0vd7kaqy6bh u +$emf$, 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 through .:rufdz*yup2 a loop of wire produces what kind pf zy:. d2ur*uof 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 tht5naq2-72 qvy+ qw/nyux ju. ce induceqn twxynqy. u/jav +27cq5u2-d $emf$, 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 magne)exg 60re1at z+if:zhtic 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 conductor /k.r8)v0dv*p md tkquwill be that which tends to proqu 8vv mk/d.)krd tp*0duce 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 maqo7tb+gql9er; b-wm.s5/ ny.q,e bw q gnet is held above its center with its north pole pointing down. Thoe- t rnqbgbqq my9b,wwle7q5; .s. /+e 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 on3pao m21 khd8q a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abomdq8 2ha1ko p3ve)

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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 .n r3kk10 owrc-a kz4ivector points swkor34i-rcna.k k 01z traight 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 tab28ycm 2y0lzk* o-zc hole top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from a*yzhl2 o 0com-z2ky c8bove, 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 fieldrtjec 5apir,3u8z0z1 ,v ,nri points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in tirci 1u8 zap5,,3zejtv0 ,rrnhis 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 carrq3xpim * 9lt1zvf88uwies an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, th3wv 8x*quml18i9 fz tpe 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 pw vq+ uik1c/0zhbrk2/ole entering first. As the north pole enters the wire, the induced current will be (as //1ck0wiuz bk+rh2vq 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 anrhp d(ti8m/6 eww38jlsq * oizzc89 :pgular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, : oi6 8(lmitw9* e/3z8djzhrwsq8cpp 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 uw 5+7,uoooo4i*/gcl)(tpoyq ufj; u at constant angular speed about an axis whose direction ctuo (ocj7 f/*4gupy,oi)owo5+ qu ul ;an be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.31rvl s 4rgr.jqh)0m/yadx z/
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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 thixnzc-/r :e9ng+ vp9dat 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 field86yh6u tq*htyd/i(x( j m+ mv :l,nurb. 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 movedlyat3 ) tate tiuw/yq )/-;ae6 northward at constant velocity through a magnetic field that points se3- /ya utitlq; e/y))aaw6 tttraight 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 rotater4 9ays+ 5wnius 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 w ky*ggo-n )c4aaev7um6 -bw obs6f..transforms

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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 frequency t, br j(*-uxgeof th,ebj(u -*gt rxe $emf$ 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 usedt ) jf1rqhf8 mb:,em(r.ciw p, 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 j /bxo2) 9r3iafjm 0zwthat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops thea4vg30- u: d s z4j;m(.)qeeyzpfcnn an the primary coil emsjz 3)cd4n-ev0 4u(z .:faepqng;y then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops thanrn n(34q8bfph the secondary coil then it irnh 4pf 3(n8bqs 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 powerwcogufj5hk3- 6 w fpjt(x.6/ q 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 circuit0 wj+7 0r gljjr;1usia,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batte r5nqbgv8t *m;ry of constant terminalntbrqv5g;m 8* voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series 7l,z -v/s azntto an ideal battery of constant terminal voltage. Attsv n z7-al,/z 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 inducta5,mjvsovjf52j * p vum/4d8dsnce 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 resistance R is conn5c3aa r3xnc1h,d9kr 7 byqq .kected 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 conneoc tkt7ltf4q,a5308t 4j1 iivaevn0u cted in series to a battery. The time constant for the circuit represents the time r84f oqv1t4n, ttlkjic7 ei3uav0t 5 a0equired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery m/wxxaq n+hn7imwi.ha0(t +4is suddenly removed from the circuit. Thqnn0 m/+a(w4.imwtxhai x + 7he time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same un: r; t lec+/pzvop5ajl,7r i bry16)msits 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 circ7+rv dgakl/ 3 jnp,f7;kgq7ikuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curre,v7(,f*jtuymvuhtl*p- 1ylpx uic0l+c(lc, nt,* ti( -h0lvcjycl*y+ xp,f 1pmu tv7(,lcluu

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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 cxtax;sv:k)xb(5 i o)ev3by - w yp3zw.hanges by what factor when the frequency )- 3vepi)xt(zx3;wyxk.oa 5b vswy: b 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 xbci/y22g8 z4tncjxo5n frxio-2 j01an inductor is doubled, the inductive reactance of thfbi-252gz4xx / 821xj co j0cnnirotyat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an indu:zwq- 0zc 0qnjctor approaches zero, the inductive reactance of th -qnzz:j q0wc0at 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 ang4y( tusi +k1imle8wu-x/s4 u AC power supply. In this circuit, the curreu-gluy4msw sxit8 k +/4(ei1unt

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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 anf7maokrr* m:zatn17 4 ac circuit changes by what factor when the frequer*a 7f1 n47kramzotm:ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero,qn*z xe66ea) /:m jetl the capacitive reactance of that capt*:je/)x l6e6 maqez nacitor

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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 betweetckxz(u - i:m(b5j:no n the voltages of the inductor and capacitor in a RLC series circukmzt-(x5un: o:cbij( it?

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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 RLa idx8z2j+0euC 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 y 2ufy6x(yivqon7l+) impedance of the circuit increases if R increases. When is this statement xf6lyu2i(vqyyo 7 )n+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 ofmo7d0e (zv dnzpo r5+,/tp4rj 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. x c;d ) e5pv1j4h2n itd0wu)obThe impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series p7q7nve d)o- ump 7;sgcircuit, the resonant frequency of tha ;-7qe npoug77) pmdsvt 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 driven by an yt,hz b-.uczp)gy z20g4d4 i rAC 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 occurs when h7kd+95 jtwdd

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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 rotatinm g ghky-w-5v7g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planegwy m-vh k5-g7 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 uniform magnetic field of 0.20t6c h 0awn*o ji5fm)a6 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fielcwmi6 j65) ta*fnh0oad 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 r5.tlqn-i*9ndy0jfk zotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throughdq0.* z59jti-f klnny 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 qmioa f47xfcb)t(i q0- v3z/n adjustable 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 cog hj7g1tm3nfhc57t2y il 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)2y f.a o8,:tum- pqq0exxyyk 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 8yxkt-q uyoqxp m 8a,.0efy)2: .0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an arzhtmb 82u*vp9 ,r5kfa ea 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 an m vgnz( 5osskqq1d3gagf)+; ;d area $0.20 \; m^{2}$ 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 flied by;m0c qu pev,0.is*t0,72 a udfdwts horizontally at a location where the s,ywa0*.tc p d ,qut70b0died mv f;2udownward 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 ro6 6m+ 1ssvnt( 8j0v;spxeulq7ffh q: ,fa-iiy tates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of -f;nqufxh:t 0p(jays61eif7 +6s mlvsvi 8 q,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 le-:w w0q .jb1ds xk,cjoops 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 of 100 turns of w;gw9l g0z3qm)i 7yay:kzap zw*hy(8x ire 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 rectan wj;byr,9vvssi p 2)q2gular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates atwq)p2j9, ssrv by;v2i 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum 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 area p9li9fv6o6 xk $0.090 \; m^{2}$ 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 outh+tz+*20s8 )yyy h u ola9clejput of 12 V maximum when rotaj *+a 2eyyh8u cll0+ozhs)ty9 ted 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 ga) 1 v3nygqkus*tuje gb-;d:g3i *pb4enerator 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 motor operates o1 s e.*eq-aws svzx oefv,0x08n $120 \; V$ 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 7yd ,dmns.1/va- h gniW. The motor operates on 120 V AC, an msy,ia.-1v7ng ddnh/d 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 ;gpst7wnf u* id8 l/ cfh,0i:yW is connected to a 24-V power supply. The operating current is 1.0 A. Whtnyf i/7 :d u;lih0wsp8f *gc,at 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 restiyrb u9,f65) (wt,fegz y,cnistance 6.0 W is connected to a 24-V power supply. The operfcg ,f5tybw,9 iytz)n ,e6(ruating 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 wqwe 1w7h4uk dgdp1p(5sb2 1aconnected to a 24-V power supply. The operating current is 1.0 A at full sebs1g54u1 ak( wph21wdw7p q dpeed. 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 i/,w6em5irfadpc ) *b ys 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 prim2tu45w q;oe yhary of a transformer causes 14 A to flow in the secondary. 2;weuoq h45 tyHow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turnsjo5 xje5d:92. 7gnmccqgb2d.sk fgq) are necessary in a 110-V primary if the 24-V secondary has 100 2gj:5.e9cng msqgd2 jf)dx q5 .ko7bcturns?

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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 secondary co7ip9ez3d.;p, 60 ixrsglp wnz il. Ippxlgwz9 i.z60dre ;3sni,p 7f the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformerk pp8/; ys2w2b y g9rgvyvs0i,. Assuming 100% efficiency, how many amps at 24 V c9y;ppy, 2rkgis yw20 /b8 gvsvan flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transfore lngi1cbuv9)17czq6 mer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Wl)9c 1vn71 z 6cieuqgbhat 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 primaryyejj6/w s6) v+b2t uia;+jm nllz/r0l coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondarbw)i6 e6lnj/lt0j/aju2r + syl+m z; vy?

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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 turn6t p:e)i4mrdqs on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presentiq4tmed6) :p r 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 10:1hn0alod4.djnh;, c,sz gyr0 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currenr az40c l,n1sdghn.d ;y :,ojht 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 turnef: gfiwo oo03to60 s3s and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secon60toi: eo3o gsw30ffodary 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 turns. Io;p/n3zzjl:b1stb 2z y)d rv(f the power input to the primary i/ptb l) rj2;1d3:zy(szovnzb s 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 usually steppedy4 0yo5hd7lwc up to 4500 V by a transformer and transmitted through a power line of total re cwylh d70oy45sistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepzdj/*et 4ra7l ped up to 4500 V by a transformer and t 7d r*eja4t/zlransmitted through a power 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 At, , pw-u syf0syotm3rp7r,4/pun zu/ of 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 u03, /p,ws mtru,4t s ozr/7pynpfuy- is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanbdr(m2i3h a r.g4u xp9ce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissionpg a2ub4i(rd.r 9x3mh line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total.-6 ,1ozn--mloa:jlomd gskyz ep4 1 j 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, the voltage is stepped up with a transformer with a turns ratio of 100:1. What per -zj z,ngaooo-j 1lmm-y s4l1d:6.ekpcentage 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 u yzj8 fe0f q5o(o*k7j6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of a*jo5f 7ukfy8qe(o0z jt 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is 6uy3 8ahbxg5w0dod2 xj84nfi to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transfxa8o n ijhf6 dg48dub0325wyxormer 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 currr e d, hbd,2vris.js32ent of 5.0 A. How much energy is stored in the coil's magnetic fe2r. ji,r2dvh3sds, bield?

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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: hlk0 zpb0e1f.0-W resistor and an 18-H inductor. What is this hkpb0zfe01 l: circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC ci.zv5vosh l:5rzp u-:d rcuit 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-V x hft9f+-bqp 3AC 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. Whatj qby;waf :j8*p4r7;dzv s-u5fmc4j d4yj1 x d is the resistance of the la d ; 14 qpvjjmf7zd4xjbudcrf 4-:5*jyawys8;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 power supply. Wh*pwd scn7;b, 6ej jq :*w1g) fpz,omdsat is the peak current through the resistorpf)d6gjd1 snwobzw*sejcm:, q ;7p,* ?

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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 4 )55czf ekxjea 120-V ac power supply. What is the power dissipated in55ee xf4)zj ck 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 c+8 ndeahv5z w*xb*6u50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistoif8b;olcqtg 8 /8 ii(yr 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 resistor i3 05ssykbsu) b3ls 9j)k *plias $I = 0.80 \sin (240 t)$. 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 6/;qk w/ct9*jm,ndpm h 0 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 coiepobb ( 7+esj8l 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-mb i-xbrl1t y1-(f;ewd H 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 10003u(y(q8-oaj9;sbg dsnv0g mu 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-muo. si.ps p6m,H inductor when 120 V AC at a frequency of 20 kHz is appl,pou6. m.i sspied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz source)ashumh8xs.p3 3ledpe, x -ibnwp+ /3 ?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-m43efg o7t* qnhF 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 t*7hru0zll u/ 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 do24uw:d bv2tg jbg3cp5ak(iyfmh/ *o4es a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wi* j bvr* qz w/h(mmrt85oh(5rpll the capacitive reactance of a 0.010-mF capacitor be 100 W?/mjth*85q wpr5o(vm r(b*r zh

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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 0.0013d1rhr .v9lx8 *t .y-nitavco 0-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an /qv(xoq6-fd xt 66 uq-)ynvoj ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitiy-(66uv jqx f do xvtq/-)qn6ove 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 1500d*c5 j,fy;37aj *qt1qab nd ku3grbc/ Hz if a 100-W resistor, 20-mH coil, and 1.0-m1*b3,gu;bdrk53c7c a jq qy nf /*adjtF capacitor 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 c cvwiuo18.)ipd i+xzzaj53 ;ptx 7e2a oil, and 1.0-mF capacitor are )pi .;xi5tde2 z+ixvw87au 1aozj3 cpconnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected inxy1l1l urr5p 6h;nwniow w3;- series with a 20-mH inductor, what is the impedance at 1000 pl1wn6wirw 5o ;1hry-; nxl3uHz?

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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 inductor, wvph5p) cuyv5 zv7 mji700d6phhat is the phase angle at 1000 v0p cv7)5mj7z 56pdphiv uh0yHz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH cq 2l2it7dk*l;uhs/p hoil and 1.0-mF capacitor for audh7t;i2l h2qs/lk *p total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resishie v t w,mj5ggukm1(. /lu9o:tor and 15-mH coil to get a tot (ieuv k .tgoj:9h l5gummw/,1al 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 mustcpe 8qlg9g/ h66etu q3 be put in series with a 450-mH inductor at 5000 Hz for a total impedag qtuge8p3/lh9 c6e6qnce 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 lv g1zu)ud*,sbe put in series with a 100-kW resistor at 1.0-MHz for a total uzgvl1,su *d )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 serixsg.(7imd ns4 es with a 20-mF capacitor. What is the impedance at 1( .i4m sxsngd7000 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 ) l*xn m +x-yc*6rb5ypmb9ew ba 10-mF capacitor at 1.0 kHz for a total i-ywb* +c)5x6mbbrmeyxn * p9 lmpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phx1*wj3 aykqd.ase a1.q*yj w dxk3angle 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 r9 ma-zpm;gm+gbe+*gaesistor at 1.0 kHz for a total impedance bgg;9pma g-+ e*a+zmmof 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor a0il1 ngqvvi)n )a /+qgt 120 Hz. What is the phanvaqn iv1lgi ) +)/q0gse 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 1 b +q*.nh wz -opiwxa)0m3fv2fm;ttn a-wq:,x00-W resistor, 20-mH coil, and 1.0-mF capacitor,wbia;3o f20v-w m-fmnpt w tzxqa*.h+)qx : n 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-+kl0l7o. gg9 w uzi:xkmF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms wg.7ogkl9ul0 i+z :xk 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 capac/qxyp5c t06alitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-l q5ac y6tx0/pHz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit coy/hj*7 2 9cqk0ozzfrqntaining a 50-W resistor, a 10-mF capacitor, and a 0.f j7ozzckr/h 20* qy9q45-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 5+9eckb ts b:t2i frs6jkqz we8(264ot 00-W resistor for a phase angle oftj q:i( w66zs c9 k2e2bsbktore8ft 4+ $40^{\circ}$ 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, qfv5ha 4zy0d2uo5t o 8C = 10.0 mF. At what frequency should the circuit be driven in order to have maxim ftzoo542q0y8uad5v h um power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit)e/ewc 4 na v jpukmc20v6ya22 with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 Wpa ce2vcw) 0ukjm4 n2/e2vay6 capacitive reactance, 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 AC cid: mfjkx(a 3k wayxix +gsi1m585a3b8rcuit 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. o -ih s(az.sfj 31g8e+ jgd,ki What is the powhe zi8+1 s,fasg-di jjgk.o(3er factor?

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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 resis0ao-ihl 2npd+ tor, a 10-mF capacitorp 2na 0lohd+-i, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seriesv9kht35) z b koq311bilvcb6e ? 13c)b e6oiv hkbz5k91tb3vlq

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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 46rvm2dv6wfh(so e7)t3p.5t a)fheb l .7-mF capacitor for a resonant frequency of 10 )fh rastle t 6.6h5v (vo)2d37mpefw bkHz?

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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 resonant f/m s4zo/tv1zdrequencyd1/sz /zto4mv of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mHgr,l/ jqne1(*) b.m( 50a lmgxrg.hmf kf:zax coil if the resonant frequency of the circuit is to be kmgbf( nlfh.j q :. (rzemr5/agml,0 *agx1x)1000 Hz?

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