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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 excep q1icb*l w1c pn6dw*c.t

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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 induv;g8,p j7c4(3*wj xbn v2ykkvmb cyis )1)dumction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil g ,v1np4(c sgjproduces what kind of change on thvgsp (gc1n4,je 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 fsf,x nga8;x2 bn6g: jm/w2e ythe magnetic field through a loop of wire produces what kind of cf: 86 ;gefg2mjsa2xbx w,/n ynhange 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 prod3 8 * bcj2ly( .6flhi :guqwz5y5zgoznuces what kind of change on the inducy h 6b (:uz3 i8 5cnlf2.qgwogy5jz*lzed $emf$, 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 fb+952sih7ar ,dkbdx 52m dghjlzp/ )4 .cmsyiield 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 lawrc gxe40gw5sg2/j- wt , the direction of an induced current in a conductor will be that which tends to produce which of the fo w 2 4-t0jcxw5sg/grgellowing 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 hko4u 0 d9hoj l(6hzk1.tm kck:rfy*a/orizontal table. A bar magnet is held above its center with its north pole pointing down. The statiomyf h r(:la40otkh /o1ud.kzk9*j kc6nary 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*1c(i us4aohoqc u8(fz2gc)tzx-m;s table. A bar magnet is held above its center with its north pole pointing down, and release suz;(s zi)c futo-omh21 g8qx4a* (ccd. 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 vector po su5o xb 3zzl)v*hj5 kkx()0cyints straight up. The magnetic field vanishes suddenly.kl *b(u h5okvxcz))jsy0 z5x3 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 l 5yot xizpw;96evel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field56pzo9;x wiy t 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 iyxq 7wc o3:v3zs+h ,ean a region where the magnetic field points straight down. The magnetic fielx7+y,hwqezoa3vsc 3 :d disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wirewt*+nt*nj(ug8 ). ex;boybb q ob mr;pb;ci 0: lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either sic tq.;irtojb+o)*(wb; yen0*up; nmbgb :xb 8de 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 auqrdng yq9g2; d.d l/5 loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed f;/g .9d dyu ld25qgnrqrom 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 rotateg .a/(gw 3mzzi-zqhp/.awiy; d at constant 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 axis of/(;gzyzpw a i.zh3 .ia/g mw-q 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 constt vua5btjxn mwy:q):25afqh6.p o y6fft-y,- ant 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 a v5aft2,yx tff5buwnpy :.to-- 6h6q: a)jmyqxis 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.q+ n bft*fp+j hmv,5q.
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an dzr)d kqcx/ .ip3q5m2 $emf$ 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 magneti5k ,ut,)k3i w rohxqj:c 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 direu+y)ul u7ic cp ux9u-.ction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentialul c9ux+)puc y. 7-uiu 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 constana;jr 4dd+*.o 4atijmft 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 trankylnjm i-z .j 1qdv0b+-gqc52x hj 0z3sforms

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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 revolutio,8isg 3tmo6zhn*aeb ( ns each second. The frequency of the ,o6mn8(3z*g b tieh as$emf$ 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 devic;1ytv 5pf3,3 ercjj5l ez ef;pe used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a de2scz-s0pdx- 7o tnwt9vice 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 secondarlp*jwi2yxp+ls1 b+z.zq5 vww3 .uj z5y coil contains more loops than the primary coil txj +uv*bywwz. lj zq5zi1p23+. ps5lw hen 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 tvbz(m; myg;1b :4lgfm han the secondary coi l;mbzfvm 4 1myb;(:ggl then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power b- y:xn k-aaiecoh4jkfa dv..jr:; 92input

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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 c/mgsw9,pkajr.1e-n b o; f6huircuit,

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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 ideaor76n:nkx0f yl battery of constant terminal voltage. At the momenr xof0 6n7kny:t 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 to an ideal battery oa2/ov o/ gzdxas47xl.f constant terminal voltage. At the moment contact4s /.a7o/a2oxvx zdgl 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 inductanceb. 3bq mg,hb0f 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 l) /8xyu m9fsm,9vpyr connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batter)zezb)x4 tb m,b; m8oc*u +wwjy. The time constant for the circuit represents th8);oztb+ b x,*z4)mumeww bjce 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 a hd;,7*ecn c, zb1jymjre connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of tmyd*17 c jebh,n,cz;jhe 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 eq 7ily2cju9l4b+jn: the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this:4c-nx :2 yq+5zsgcrv izg6 k2m1yvtz 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. Incfyk*sl9( h bgmj1vhv-0jt :j,2ik(e this circuit, the curren(hl kj21sy: t j(fckie*mv,g9j0- bhvt

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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 changes by what factor when t/l6v 2a;wfd( pqs o+uuhe frequency s w6uudqov 2(paf;/l +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 inductiv7cge9m ;(koof e reactance f(ook;c me7g9 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 across an indutc8e,+laq8bpvn2 + 4upn ha2cctor approaches zero, the inductive reactancep2l4+tpb8 e2aahcq+v u,n cn8 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 connecte*v wdfdn)q3+ v,aual;an d(3 id to an AC power supply. In this circuit, the current+u if)n*qv(3a; dw,ad3 vn lad

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when thet5q(by gr(q*cmq 2w w0 frequew r*(cbtqq0ygwmq5 (2ncy 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 n5ueqv6jm;2 rapproaches zero, the capacitive reactance of that r 6v5qn;um2ej 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 induc0l )i y-t 6g2vmbs(ijvtor and capacitor in a RL t(-2y bm0isjvv6ig)lC 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 aoipm ks7r26 6) ycyfx/r0s*mu n RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increase:fu7d sjautlh6g6 x0wr;* ir9s. When i;u60gr* ul:shiaxd67 jrw 9tfs this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impef** ;wpxj2,vces r)x xdance 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 impedandmnz6mr b-neq-8go 6 0ce of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, tvmv *wk 67w7clhe resonant frequency of*vk 7cmv6 ww7l 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 driven by an AC applied voltaoisa7-s7.rfr ge. 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 circu:uhy 2dw+rk5 o1u+kcait 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 mct7)m 8p,z ed 39oeumr is rotating 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 field vector are parallel.7 z9cto mmdrpue3),8e

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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 mag8s( itze*k q-b0gx, ednetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie(-k*d,x q0b 8teiszegld 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.bzwhwrev 0w9 hh-;( yd)8ce 1eo)bsh)10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planebbehw evy9;1 wd0h(z 8crh))eosw h-) 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 is reduced fr,ium mp+j 4t yc xsn 4h7hb8vw0b3,m/pom $1.0 \; m^{2}$ 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 coimp89pm)4 fisyl 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 auvrjee45by9y62 a( bsquare frame with sides 18 cm. A uniform magnetic field ab6eb y59 4earuy2vj(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 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 )d3 ce) wr-+md2fdxvywith 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 )17pscgb5v qvo( pj0e and 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 flie7 0k)dqoslpn- s horizontally at a location where the downs) q70on-kldpward 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 rotates dt xijar6(c,)at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic )ax( icd6 tj,rfield 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 cr(j;q w/qsxi5fa f l-x-oss-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 o, 1leyx: 6,9d hsd/)djn)bzjgz o9ewo f 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 rqz,ja0(r;npb4goj q:.o+ bnarmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotajjq 0 ;+noqrrg. bz,b :oap4n(tion, 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 wir v0rmoim;h*3w e 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 generatoyci 4+v-xlykee ,po ,4r with an output of 12 V maximum when rotated at 60 Hz. A i4,olv -+e ,xycp4keymagnetic 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 generat+x.mipn*msg9/9. , xjg eyksjor 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 o, 6 /zeal+y3vuza qp06kv(1gnobok -en $120 \; V$ 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 motor ope* ke:d 0xog40gtz6mclrates on 120 V A06dxto4*gm c ekzl: 0gC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is col i hdme,xblmaz-;4jw3; r o67vf r3y6nnected to a 24-V power supply. The operating 4 ;3a;lv,rfrbozy6e7m6 hwm xdi-lj3current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resu9t)lw 5 4vvczn8 e:wlistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fullt)n uw9z4evc5l8w :vl speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V p8-:as3lj- *k1y+ao pei ktjg cower supply. The operating current is 1.0 A at full speed. What is the bajg +o-ck-yl :j 1*pia3s ae8ktck $emf$ 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 to reduce a primary voltagnt29c8 rm ni9we 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 seconz4hgxlz1 ( ,q3k 2qg+qajrl) ndary. How many turns are in the secoq 1l,xzg2nz (rq3+l4)qak jghndary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, howixywywsf1s*djoa 39:vyb6n hk25 /+r many turns are necessary in a 110-V primary if the 24-V secondary has 100 t v3fd rh/+k51y:j9 6wysnawyb2 oxsi *urns?

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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 ajees7 kep 5c6mvj-.dq-bjt-7z +8e na 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the mac5ds j.ej6 jk pnb+t--e z-e87v7eqprimary?

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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. dx0jove945yv (m)7( jlr tmx oAssuming 100% efficiency, how many am4mtrlo y x0jjxmd9(ov )e5(v7 ps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer p/be 190.qsc)-rnxnnwf/fxd crovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary 0xf.1 9n/)drnq fsxn b/ew cc-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 65 z.qwod+x s6:miln ,g0 turns on its primary coil and 300 turns on its secondary coil.low zmg 56+nqi:.,dxs If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and6g/0q,4v fru4z czugf 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is puz/ 4 g vz6g4cuf,r0qfresent 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 i tr 4l9 ze/(syhv-1nlt o;u3jcts secondary has 200 turns. If the input current at the primary is 100 A, we cae;unrh( zvlo-c1/ jsy3 49ltt n 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 tu9doo 0 9mfr;6iya bge-rns and its secondary has 200 turns. If the input voltage to the primary is 1 ebi0m f699dgo;r-o ya00 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 20go a41es hvwbr/,pl r8 b4mwlk8hd.56 0 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictrb8we4wv8. r1 lhlab6 mgokp/s4dh,5ional 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 is3h vuw s v8-pxe.jb((r,c/ejl usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fi.3uvej,b(-(8plhx r v wc/ sejnd 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 stepped u6m dp+:tv5jupptb.2g p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentd vjp ugt+6.p2mpt :b5age power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V : h m0t,1f -vk)ulzlliwv/q9b. 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 trab:vkmulw 0ztlh/)vlf 9,i-1 qnsmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total reiz*9b4dkz lpi n(9 9ursistance 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 ratiz9d ( *l9kib 4iz9pnruo of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A genere9 r mjp8h5us*ator 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. *se m85urj9ph 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 poa * uw3-ziv*1 dekedc4wer would be lost if the power were transmitted at 3ia-14*dvz*c euekd3 w000 V instead 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 A2 3/(hqrebpyo. It is to be transmitted on a line with resistance of 0.60 W. q2r3(ho /bepyTo what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the 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 e 3 lkfjjq4m9r6kva 1zo7fr4n q at6v(.n0g5imuch energy is stored in the coil's magneticrvkf(6.0 rk3 o n5lvi4t g47 nz1q9emjajfq6a field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. ho 5d53 sho,k6xiisu 4 What is this circuit's tim o5ks5i3,oh6h ixu4 dse 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 circuitrh81.,5ahw7m+ 2;ub 5 obf3ubrlhq f 9drjoxg 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 AC outlet. W8 :5j72 clw y(lb yi6h8mi-dxfijyjn, hat is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistadb ( bbvijjan6:o.m:5 nce of the lamp?i:.mbo(5 ndbv6:ja 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 poc7q :ckrzxbu ,77 tz8jwer supply. What is the peak current thro:t zq 7ccubrx,7 j8z7kugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac k)njdsm , 0/x.*bfgb 5zwysj4 power supply. What is the power dissipated in the regfmkss wx 5/b4 0,njzj bdy.*)sistor?

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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 resistoa5 v-sb37u2gueu c(2vlya o1 er 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 resishp*6yvkygt+ k vhu- );tor 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 r9. omr :h6kejo(dt*aa 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance oe, a icd-0m0aqyd601 q+1b jd yf6smhtf 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 vj2pdln4;l -vrr./ey ( (6v 5dljtjsaat 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W o0+u aa .xramn8a1cnz-f 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 neces pgq5sysriy- *5p67ww sary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a abp,l;8dl w(i7rk 4wf 60-mH inductor when 120 V AC at a frequency of 20 kHz is a ikr, (lfwawb;d74 8lppplied 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 du8e zxt( opj.(xy1 xxd4e 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 reactance of a 4.7-mF capacit j 5b5;)zr1x+ x52bjni/4pfzfjwntx oor 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 reactan;. m)yes) ezdvce 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 c y)z8hc* li,v zlbs5o:x/2yv 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 will the capacitiv-( 4ul vt:(erjzq8+vh/wn, w5 unewzue reactance of a 0.010-mF capacitor be 100 W?wvtvzu u-+ q/(, r nh zw4en8l5wjue(:

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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 10 g)yqy yyq+y+y0wd,)qg-dgd-00 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W r2sqe s,f w,0ctesistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanceesc,f2 qs0t,w?

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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 15dh f38 hz7o1vm00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected 17z3f8 dv mohhin 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/dsv(q8 gcar., 20-mH coil, and 1.0-mF capacitor are connecter(c /ad8gv q.sd 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 connected0 l-gauzqms laq;+vl95+ +hve in series with a 20-mH inductor, what is the impedan+mag0qlle s ++9- zva h;qv5ulce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inducto) 2 *(cbr*3uqg3 v+sf kiwp/gzqvsq3 ar, what is the phase anglg+bq *vc3*arf 2 sq)/qw3gik(3vpzsue at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capacv+z ;yymrqg; 6itor f yg;mz;r 6qyv+or a 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 caplvwl8l 4k;d;l acitances is needed in series with a 100-W resistor and 15-mll4;lkv8;w d lH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz.cwmg7:*jbg* ,fj9djq4abju for a total impedance o.w*bqa dgjuc 9*b:f j,7m j4jgf 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 at 1.0-MHz ford ,mt cwgb*4:fg3a0vsjo 5pj :zz93oq a total impedance :5w ajgptjz ,b zv 3co4*930osgqdf:mof 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 1kx+4ad 6smx tseries with a 20-mF capacitor. What is the impedance at 1000 Hzs4 +tdkma1 x6x?

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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 at 1.0 kHv zyx0,6x:)j c 9sbeubz for a total impedance,sxeuz bbx):y vc09j 6 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 kbn5ump gh2k(h wi8de(+dkn iw6kc, 9 5geac+0Hz for a phase angle of 2+ hpkcdb8wi ,0n5g waekied(gnh5m(9c6+uk$40^{\circ}$?

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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 4iau.qwz (nu:at 1.0 kHz for a total impedance u(.an:wiqz 4u 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 capacitor at 120 Hz. What is the pi1/qo(e 4r5 shk mlno.hase4o (liqk. m5sn/o1rhe 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 im5:01iw psov)/xr r lfe tpri0;*s7b a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are coxpl;i /sr0w p5e70irbt*o m1v ):fs rinnected 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 resist 3aluus7-;kns or, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in tl-k n3 ;uus7sahe circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor a: jxn:j6bm , q;kb.vmof capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series t jn:6mxq.jmb:k b,;avo 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 ang84w gnr *w b7j z:eb,j.aku:b 7b9;ekbvveo 0gle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H i ubeoba7rb n.jb ,4ev:w:9; kbz0g8ewgkv* j7nductor, 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 for b x0z;a0qqv3 wa phase angle of b3;x0 0wqzavq $40^{\circ}$ 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 0nm34c/f5 j2t+4.rch wldg*d bfkcit.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven inb2n*c c0i4 jfg t/rc.+5fkhtmldd4 3w order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistancsw m2c y pv+/zb66oet.e, 15.0 W inductive reactance, and 10.0 W capacitive reactw6bs2cmt. +oy6v/p ezance, 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 circuit is p +by 4a;iyr,)1obkke$63^{\circ}$. 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 impedancev d p3;5osr8nf of 60 W and a resistance of 30 W. What is the sdro85 n;3fvppower 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 ciiavhcy*2 u+- ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when y 2i*v-+hc aiuconnected 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 anddfotsh8 r3md)d*z)o :.2myc b a 15-mH coil in series?sorfmb3zom.)h *d dct d: )y28

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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 ijrk cq uv85ch5q36jk62w3hp t.c l v7capacitor for a resonant frequency36i3p. cwu ch2qjjh8vkcl 5tkr675vq of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonantfjgx)u/v z md wcs,r.jgz*(9( frequency o cu)zs (jzjm(*9 g.wr,fg/vdxf 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 inseb +5dbf+p.6: yjmvk series with a 30-W resistor and a 40-mH coil if the resonant frequeevp+ db .+mb ks6j:y5fncy of the circuit is to be 1000 Hz?

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