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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 xemrjkazsw8-it+ j80c o;63g 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 hwsw0s-fae se*n *b(t3nqh0 )the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change v2w;l kog)hv vw;35dvylaicb2 3 -ts0on the inducedw-dw )vg0c 2l5;tib3y; vha 3lk sv2vo $emf$, 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 th2gr i.1 gi acg26wzicli9. pp2rough a loop of wire produces what kind p2 2zpgwigg9.i 1r.lciac62 iof 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 k4.pu.ka 8 zizs*utxz(ind of change on the induc .(zz4z8 xpk .sutu*iaed $emf$, 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 mf1kijixq )3+ihz0q9 from a magnetic 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 cond 3z;h;t,qvmxb uctor will be that which tends to produce which o;vzqb xthm,;3 f 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 d .k1dpfse9lwyfz. o1-5du/a t10xhshorizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from.19ua5h1sx y f-e f.kzt/ ddl1opwd s0 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 bar magnet is held above itsgce969.9gxtauwov: s center with its north pole pointing down, and released. As it approacht vw9 6ao9.9 gxse:cgues 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 tafh:3ki q u-4-maxvg: op in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from abov4:h qxa:kgf-3a ium-ve, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region whw om(zu0,9nq1yy ; fni07dgmn ere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the iiyng9o;,700z nudn( f1ym mqwnduced 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 afg3pg4e/u kaj,udq pi70l-8 h horizontal table top in a region where the magnetic field points straight dowg8 ljeu73kqg-pfd/ 4 0,hpuian. The magnetic field 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 wire lies on a horizontal table acko5x aq5ku63 , ozj(xnd carries an ever-increasing curren 5ckqa uzk(x65 ,3ojoxt northward. 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 throua.s1 pbh twef*nb/ n26 n36;mmuz)pad4p 1zsvgh a loop of wire with the north pole entering first. As the norta/ 3;b2sppa z.n*6efv1dw6b1 )mtph nu mz4nsh pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angula4kv7a*3 sn8w mepql 4pr speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight d4en ps74l ak8q3v wp*mown, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed vcwae8o2c1q :about an axis whose direction can be varied. In a region where a uniform magneti8:1cqa2o ve cwc 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.(w8n1o88r ie uds*/:0o yrp/wpj yslc
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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 m*rt6 ueqo:3 n$emf$ 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 fiele)vpl4o7/ e.xa6lot cd. 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 thfcom 0 1we/87cvu )bsxe east-west direction) is moved northward at constant velocity through a magnetic fields )71x8f mebcc0wvu/o that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates as4pv xgpy7s-6 t 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 transf.acb8itps *rtr a. ny8c*z n3y:v1 yy(orms

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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 2s6ta(j z 9spsrevolutions each second. The frequency of the ssp26zat(9s j $emf$ 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 fjww8ywj:vw2l0w 93 jused 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 devjd ( icwlsn579ooor-tqb /+7kice 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 c .c;c-d:ramb yh+gdz.ontains more loops than the primary coil then chr.z ;: dg- my.adb+cit 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 loopdcgh(kwi 5-pxgv)f 4.8(osu os than the secondary coil then it is fg(ocd-8) 54 ig xsuphkv(w.oa

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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 i*e c+qr-c bs0power 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 resonantgs bd/jd7ivl/id 9k. +(e0jzs circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductorp1u- dqak7f5p;qipocnkt,: - are connected in series to an ideal battery of constant terminal voltage. At the momen cpn1 ,p5katu o7q; -k-fdiq:pt 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 + gcquvg(ck.0fd km2fx a7i3. of constant terminal voltage. At the moment contact is made with the battery, the voltage acros(ca c.q3f . 2+vdgu0f igkkm7xs 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 inductansy pdk/)p 9 vd2lcm(d:omvt 84ce 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 inductanc;op9hymm )u-r +wy24m+ k xddde 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 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 l umgflz.75r(9 n hv s0 c6svbf96zvz3connected in series to a battery. The time constant for thev6mzuzl9(h3.0lff vbg6 ns7zsv9r 5c circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The b4*v9u c0b)kit7 pbm qeeom: tw3nc66mattery is suddenly 76:i c*w) ue0bem9po k34mmt tnv q6cbremoved from the 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 ft:4 vy -bq2ththe 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 tas:zg:wekb2 nn ,h,- dhis 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 suppxc(retde7k/ qg8 6z3fpe; m 0qly. In this circuit, the currente 83xdqcg k/( tf;m7q06zp ere

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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 rp ,boq5k-rb2 the frequency is trippb2 -rk 5qb,roled?

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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 acpdsx239 62alh rrbg0 dybw :9vross an inductor is doubled, the inductive reactance of thgslad9 62rv92d :b0wp yxrhb3at 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 inductor ap;,ty) z idey9u0 v, vrmk)l78pq ;kmraproaches zero, the inductivepl8 yi0ut;vae)y q m;vk7mz,9 ),drrk reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC powb3 ji7p/+qjry er supply. In this circuit, the currenj ijpy7+r3b /qt

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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 acqvxhs0/z- ,c k circuit changes by what factor when the frequency is t x,-szkcv0q /hripled?

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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 appro8jg7jo j9ao6 kaches zero, the capacitive reactance of 7oj j9o86gajk 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 inmoccfb66i2pg/ ./ qbuv 1dwh:ductor and capacitor in a RLC series c /pbd vu1f6o:q6gmichw bc2/ .ircuit?

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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 circuit is defie.mxz; b3rqym9ceb0 f e; -bw+swn7c5ned 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 imgbt*2pf p;:zb+vp -dbpedance of the circuit increases if R increases. When is this stap *f2g-;+tbzpbp v :bdtement 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 impedanc 2d cne);kltd9e 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 impedas3ewwky l)/)e nce 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 sec j+ce06g3)pbbi x(l zries circuit, the resonant frequency of that circz(p l3ix ecjc)b+g6b0 uit 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 t kb7h hrz2tl6 -gl/5dan AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurfgvou/fg8hzn 5gw f;84gyf 61g6ig;as when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.2(3k8ghdoyq u; p cf3r-0 T. Find the magnetic flux through3c hg-krf(pd8 oq;3 uy the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotc:g m8o fhz001v6ouara w)l;uating in a uniform magnetic field of 0.20 T. Find oo 6m l0;8g1uuwc0fhv:az a r)the magnetic flux through the 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 ru6gf:n/ c6,dtiz- (h qceoeo)7;rpjc otating in a uniform magnetic field of 0.20 T. 6;(hz-jrc ue)e qno,gtf dp7:co 6ci/ Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an a6z2zbw0ay25 xonj y4pdjustable 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 co+x ushfrnz- uk. ygf8 28af.3hil 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 side;vmf9vv4 m *wws 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chanmvv fm4vw*;w 9ges uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and f44w6e jn 6e7 fo7 zl8ue2nu:lzczg y8an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area xt 8ra*r)64g14eyczv6fn ;m a-kk axx $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horv8 /ruw +t3lnzizontally at a location where the downwa ln 3w/+8rzuvtrd 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 at a constant an 7igf6qea( 6k7ux.usv(l1( 8y hmaidlgular velocityl ei8a7x(u6 u (m hl6.si 1(akdyfv7qg of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cron8wz.e7jp) 1a r4 izhkss-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 wiwoioyw4ny *a iv.6kl8- r br37re 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. Eql. icow9,.tk ach 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 9c,wl.kt.i qoa 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 consisbroc 85sq-ju /ts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 generato, 1vozsmwb5 f0c6fow1r with an output of 12 V maximum when rotated at 60 Hz. A magnetwvz,o cw fm6 f051sob1ic 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 with ,yxn5et2 5q rrb:f4eskmw;:ba 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 okwu:(:k0ltz nf 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 mot:3j+ we kipfs7or have a resistance of 6.00 W. The motor operates on 120 V AC, and when runninfj: wsipk+37 eg 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 cz y:pp5 mur0(ionnected to a 24-V power supply. The ope: (p zuy5i0rmprating current 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 resistance 6.0 W is connected to a 24-V mn0 -3 wc d)bd.se4u unf)m;+prv-r bncm8;enpower supply. The operating current is 1.0 A at full speed. Whamn- epn e; u) -nb);vfwd+ubmn.c rs r3c0m4d8t 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 internab5 0i bsaj+.wvtg i*k,l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is ,gtbkbs a.vi *j+wi05 the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to red-:4xj: v5jv, d3u r7 frmzxrptuce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A 7ahn 27si1hqe b d81joto flow in the secondary. How meos1d ha87njq17bh i2 any 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 turns are necessmyqintrt i*, ez(zb l n5n093,ary in a 110-V primary if the 24-V sebn*yq03ien z 5milt ,(,z9n rtcondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500f)l4- punlwv4 bnrf:9+lpub4-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current - rnll f )n:p9wu4lub44bf+vpin 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 8 lwig,(v1ypfgtolns) wpv: c98n-k3. Assuming 100% efficiency, how many amps onylgcf3w8 kni-g8t9p1 :p,) wv( vslat 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 provi7r/ubn6qrcjnj4/h kn)fs 85jdes 7500 V at 10.0 mA. The primary coil operates on 120 V. What does n4b/c /n8 jukjr5 hr jn7q6f)sthe primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turt2s m vlf740-yhpe8e cns on its secondary coil. If 120 V a2esh7c 0f-vy8pl 4 tmet 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 ae7.i tzjv y6 e-r6(dwwnd 300 turns on its secondary coil. If 120 ewydz7w(eit. 6-6rj v V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. I ou,)vuw1bz76ev;-z)om raetf the input current at the pree-uwzvzbota 6o);uv1 , m)7 rimary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transf:5i c9 d2y3a.a9oi cxa)nsmmvormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary yc:a aasdicmv.59 o2xn9) i3mis 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 10r;z)(li2 i -bp8jqsx gqi;6,qn na3ni0 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)ln,q;p zq8iai qi6-;rbg3(x j in)s 2n

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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 c (v9kuju ma,9yurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tota,u (k9aj y9muvl resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A 4 3xmelb,6qiqof current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totalqi4xqe mbl36 , resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current a+35 gca yuhm*z88 tplj2um pi5t 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 perciz*h 55pt jm8p2 al8y3u c+gmuentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W5 5z+lem9;dxerb/nsr . 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 percentage of the originax+ n l9/emrs55bde;r zl 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 ta k56 )cu,(yzfjj9 a8hwqxfi:ay.*bW. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the vaw)yti .yq f5kz8(j* x b69uajh ,caf:oltage 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 h (z a*o geku3 w1,6prp4.n r.5geq29fohoiic6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of aw.upgaro.1h6cp2*9kief oz(gi r ,nh53eo4q t 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 ay261 d r+whma-nd-bjot 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the ge2--jo h1wmdn+b6ar dynerator 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 sto 7ysji q66u5bjred in the coil's magu7by 5js66q jinetic 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. Wu ogp,,qr7*d k+ zjzt,hat is this circuit's time qr,t*7dgpk z +,uoz ,jconstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage v1 .cnzib3.g; nt4a nvis 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 outlih,altm77 dk(et. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the aom3tua 094cqe. avw0 resistance of the la0. ca9uqao3va4 m ewt0mp?

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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 120y* xk f+ex:1fbk vwh :. uc6d0ahrh2t--V ac power supply. What is the peak current through the re1kvtu0 xwr:6efa-:hyh +cbhkfd *. x2 sistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power diss2ddr7k3zzcj0 d *b+ qqipajd2dr qc 3bq z+7dk*0zted 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 qalc.xz8 .21bwh dw ;oresistor 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 resistord()rl yr-t+nf 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 re9lwzg /o *lp-mwk5qru2+ vje xva+2 u*sistor 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 7a,29+lo3:.szwexof walh ae 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 reactancev (8 myz0zk 5yzlj0x*qp6 yb3q of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil h*xx l73g idw)eave 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 wz *49xg qj zp47d4q(9n5jj(kin nwgx1000 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 whxw0 lnmq+of7e 0 w7 s2wh,fxa:en 120 V AC at a frequency of 20 kHz is applne0w fol7a0xq+fw 7hx:s,2wm ied 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 throughznm58um/g sl) a 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 reactance of a 4.7, q x7 fm-:+fadx5qovk-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 rea-:yj,kosdlz e( 8 4zd qwpej;5.o1i xg5uij(xctance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF xt1zpo mx) s7y*y5 *lscapacitor 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 capg789zjic ayh w7*;kosacitive reactance of a 0.010-mF capacitor be 100 Wo;*hy7caiks8z79 j wg?

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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 capacitorja.0a3o sk)z8x9 uciew8w wo0 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 ac series circuit with 12.0 W resista(5v 7(rhqck1t5 z eqdknce, 15.0 W inductive reactance, an 7 51c5tdrkqehq((kvzd 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coz/p ru:x 37(pq3 6lyqbnm w0nfil, and 1.0-mF capacitor are connecte3(xq w3lzub07y m6q n/p npf:rd 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 resisto -206 4iw vvw7 ml6oz6m1rbpkxklvn(nr, 20-mH coil, and 1.0-mF capacitor are connecte 4vwnv 06kx7pln mm6(k2i1-vlbr ozw6d 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 in series with a 20-mH inductor, what igmj8 oxhts48(wry7 oi27 *aja6ly pt/s the imped 8yj7t/s 7imytj oao (rxg*8a4hpw l26ance 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 inductor, whatkuij)e-kokc9 l;42 b0l o 2esr is the phase angle at 1000 Hz?u s9 oe k4r k2l)l2ij-e0bok;c

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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 2)xn07gieb h0o 0-mH coil and 1.0-mF capacitor for a to0en ih70o xgb)tal 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 resd 9 ya 5+ie285uv) si cwtnrdrbr253zhistor and 15-mH idw ca)5u2v r5+e98r yi53r2hzbd tns 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 -ow): aho yio21q1 ,avdw:lw cfor a total impedan:q,owv l 1hc )w1yadi:-2w ooace 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 resi+ e3t:mih(j ts 5.hnwzstor at 1.0-MHz for a total impedance (t+z hitjews.h3: n 5mof 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the b: f3l3bi rgb49;r9esmwj*g(zix *qg impedance at 1 l b34f b*;irwqzg ir(embxgsg9:j9 *3000 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 at 1.0 kHz for yvrj nsth7pi)0f3tfye-xtoq 063+ k.a total impedank. ytviq p3f+yf007shx) 3r-ttj6e once 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 kH b6jx,*3 8xqk8(lu s: w*uoozf*fy5pdrang 3 ez for a phase angleyf(zxke*r 8, o:*b onf5*3q6us3wgljpu xad 8 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 seriesnx (kmu7sntu;6e:0zd5m avg4 with a 30-W resistor at 1.0 kHz for a total evmzans 46;n5:xgm 7t 0(udu kimpedance 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 x.o go; m z ilyeri3oq0o+)c/;ir4i0pcapacitor at 120 Hz. What is the phaseogxii;i q)o+o03piyl;0 /o . czmr 4re angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, anvy hpn5.u2pn5d 1.0-mF capacitor are connec.n5 y vp5uhp2nted 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-.7kgoodfzi r. wj: s-.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power sgkzi-rw7fs.j o.d: -o upply. 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 ca/ )f-)-f -ly5kjenr7gupd qr rpacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-H-fyn)frdru )-7 qrp j5g e/-klz 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 anglcu71d/ 7f9-1sv ughk gd;0rwkxp6szge for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pork9-z;/udfs gw0 hxgg171cu vk7 s6pdwer 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 infrc y 9qjzh8q,h, 6j.g series with a 500-W resistor for a phase angle o 6j9qr.,ghhyf,8cqj zf $40^{\circ}$ 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 = sk 87 zkk0xk6(ngz(pm u3(hl* zjmo j7200-mH, C = 10.0 mF. At what frequency should the circuit kg6( 0px(m j nl3(ozz s8mk*hzk7 u7jkbe driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circ,(- fi to9 d xbmuc.pccrlg id*.w708:b fcp2zuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance,pm .w,cxu70lod- fdct9zr b c.i8c(*i2:g b pf 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 ad;71nbc2oz hj q9ae8 kn AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistdgmrj-hsrlhqr,oyb))94o0sb o -g //ance of 30 W. What is the power facg-m,/9 y)ld rorg q- hbr/bsoo) hj4s0tor?

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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 RLbnri( twy0: (nwg) sl2d3a(lsC circuit containing a 50-W resistor, a 10-mF capacitoyi wns)0lb (t2 3n:a(rdgw s(lr, 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 1h(fh*df4+o mm (k s;d 6hr5run.0-mF capacitor and a 15-mH coil in series?ohfkr (sr +(4dmh5m;u hn 6*df

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonak87- ;0s qzqj5jck/cn*mf uvknt frequency o k*8j-;5/ckjfs 0qzuvqm kn c7f 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 tg o*mf+s l;d3)pu:okwith a 3.7-mH inductor for a resonant frequencys)flt*;o pudgo km:+3 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 a7a ahujd9ycmog7u h 8089me 4v 40-mH coil if the resonant frequency of the circuit is touv h97od7eu g 89yjmmc804a ah be 1000 Hz?

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