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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 fl(iv47c -kym /b 83f2zv qv ct6q7rngpoux 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 induct*gye b8/xk a,tion 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 produces what kind of chat*u/b o irbs09h+/esm nge on tsih us9* bo/e 0tbm/+rhe 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 strengtcde)7 mbv(/njp4):k/ w qjp tqh of the magnetic field through a loop of wire produces what kindt/)wbkeq (p)/v n7cdq:pjj m4 of 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/xtr1 3pm0dq. pb -sd;hptq (w of change on the inducer/1pph.w-;03d b qsdmxp t(tqd $emf$, 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 4ean8wq5*o b jlt)/msa 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 condw bxb9 v;wn2t4uctor will be that which tends to produce which of tb9bxnw4t; w2 vhe 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 tayhaq4g gr 21j60sg0xqble. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from0gq0aqg1s xj4yhg 26r 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 hori-e w*k, lqmo btrnk2k84u+yq0zontal table. A bar magnet is held above its centkm *wln+r-,4buq8t 0k2y qeo ker with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top ft4mtfks;c d+ )3yln* in a region where the magnetic field vector points straim+f*ct l tksf4dyn);3ght up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the mau/ 6 wiwh v8c(xz*da-fgnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in thiw/diw8(uvc*z- 6f xa hs 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 f+zqiz6) m 1ctb(txsz8ield points stra qzt(1zi8ms+cxbtz 6)ight down. 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 and carries an ever-increasing cd+h r3i5:hcc wurrent nor3:+dr c5ich hwthward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wp.*lc t ogmnvu+; :v+eire with the north pole entering first. As the north pole enters the wire, the ind.; +l*: vpum g+cetonvuced 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 angu6v*2 1u o m yb*khbvlu9p(hdh1lar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straightkbu6l 1ov2phb**(yvhum9 dh1 down, 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 )dy1l ;ff h4opangular 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 rotation if the inducedf f1d;o y4lph) $emf$ 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.uy.5wr e r3.6jmkg 0hh
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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 tha; o :fe-p3uo2dpvlgf*t an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. +su6t(-os1qo w0 um97ld 4tr 6rhn ccvThe $emf$ 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 eau,y zqe5k4kr5 st-west direction) is moved northward at constant velocity through a magnetic field that pointsz e4ky5,u k5rq straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constanvwem ;he2k jo r2/y;xgd6 0k8 -pvp:bct 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 generatow6i o-h y.lt-tr 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. y0l. fq;vmkndr90 q7;r ixy)p The frequency of th . lqf;q0i)7x r9;r ykdv0pymne $emf$ 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 ,7 u6czagt:/pzp0 mj gused 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 devi 6: l9dslmz3no 6a/wqhce 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 contains more loops than the prima d1x5bi: . ub5(rgs7wa(xl :bksi ma(cry coil thenr(cai. 5wbxus 1(dx:gsb5(l: mbai k7 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 primary8lgf.;.q8d v 6psiey j coil contains more loops than the secondary coil then it e fp.g dys.;8ijl v8q6is 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 po jznhi( e:*xcu-g.n )tzb9g( dwer 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 c,hj0f,-+vm j0cp34m1 ihxsn2xd sndu ircuit,

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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 k q9owf bm7 p-uh5: -c)p.gpxsseries to an ideal battery of constant terminal voltage. At uho7.-b-5 wsmp: qpg p9ckf)x 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 inducm9 db v,l:l 4je::rlzotor are connected in series to an ideal battery of constant terminal voltageo:rej,l lzm: 9dv:l4b . At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conne8cejdw)qh/snr: 2vi 6 k )hmay;w g3 -y5y4qfscted 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 -kuk:d:7t6 vslw,lcp 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 c ovj( /k(4fkmronnected in series to a battery. The time constant for the circuit represents the tiv/((f4k mokjrme 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 ser/q+gof;p +(tara qt -caj7 bs6ies to a battery. The battery is suddenly removed from the circuit. The time constant for of -prbg+7qa +; /foac6s ttajq (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 units exce e7j*yji jpu7uxzl 8i/tq5c :-pt:

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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 circuit, c;dia,1urngr3 vd*t*nk :2 gv 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.h 5 1epwr 3hoxoj)ctjd/0i w** In this circuit, the currenwt5*iow10e*h jo3p )djh x r/ct

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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 8lxkph(;0-kd7 gzr3 50rwf9xoje cmswhen the frequency is tripex;rc kjrxm9fksz3gwph0 5 l-d80 o7( led?

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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 in +ljb 6m1h2mdpefa3.0a s )klwductive reactan+ 6lwam3 apedh .1flmj0 sb2k)ce 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 induc v,pg8 b+crezwzx (l9;tor approaches zero, the inductive reactance of th9;v8wp,b lz cez+r(gxat 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 power supply. z+1q,hk z-q t5lbv u3kIn this circuit, the curre + hzu-k l3qtz51,qvbknt

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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 whwng8 5fvadd1;at factor when the frequency is g;d5d8aw vf1n 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 acro 2w/ e;lu8plhhdb2mw r,hb y(2ss a capacitor approaches zero, the capacitive reactance of that calu/8 hpd( , w;lrwhh2be2by2mpacitor

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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 angl 1pfp3 4r:5 99qqq2rasmxt yjne between the voltages of the inductor and capacitor in a RLC 9p51x9y pnfsqr2qta 4j :rq3mseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circukd i19shce4 y;it 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 ciy,k q9sfjr3b3mj y0 k4ibb,t9rcuit increases if R increases. When is this statement q4k3 kjiy,b9f jry3t,0 sbbm 9true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasewr-h.6c9x s m8)oyivc*tqyax - wd:c 9s 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 impedaqyv1i w o3 (p6ore m*mtu)0no/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 c -qcm20ol7vk c 0b osnoh8z.r9apacitance both double in an LRC series circuit, the resonant frequency of that circ2 v-coomlczrok9n07bq 8.0hsuit 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 5pd : ql5ejes1f4bm5a twle/n0s ,w/t 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 occurx *zgvm)qmv u3xj35y9s 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 fie3pwzq:2f)ga4p9p/lqr u5tk mqd*b 4 eld of 0.20 T. Find the magnetic flux through the loop whqwtld9qf 4u:b4p)m g5ek rqp*3z p/a2en 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 rotating in a uniform magnetic field o wz-5dx+dd . /zk+ /i)i9x*dn:tc9mogzzpwj sf 0.20 T. Findzx+ 59czkz:/i ww/- gdmnd *sp d.jod+)9txz i 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 rotating in a u.kq1 bd d nid rwy-8mp of/:f0) loduci527.rvniform magnetic field of 0.20 T. Find the mai )u.f0m-w o2n drdf l1i/q 5ov7 .8cyrbpk:ddgnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced:vjp7kj im12g from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fro2gc57e6j /)eh izk yq ah7sv4tm $4.0 \times 10^{-5} \; Wb$ 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 wiremgf/;y ac 5 ol k45 -f(qv8omx-3btsna on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average vmoaqa5lf ;4ogknb38m(f/c -x 5tvsy -alue 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 abnlw8(dk 8vx. k -wg9brea 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 a *qxgu+t8k9 fund 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 6db6naawo x-f+*8sfo , 0 m flies horizontally at a location where the downward component of the Earth's ma 6dfa-sx+w bo,*n8 afognetic 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 constay.+ 1 sxeg 19lu0ejot x(x7ljbnt angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant .tge9u(yj sl7b1joex1 l + x0xmagnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area)pvbr3d36dif 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 turnsdb.pp7 2q6k dq32aw -xyo 0okl6i5 etr of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on ( -vccwph8ohox law+y/36d q +its armature. 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 axvwac+p-c3q +hxd8 (hy6l/ oo wis 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 wiw6gxmvn l4,efq 67t :q-/nqeh *y-swwre 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 gen1umi)d) x2i/4y5b vta 1-kfdaxoz-dx erator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotxdk ab51)t dv21 4xzd)-xui- fayiom/ating 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 generatu ygefmq4,)b;6*vg psrq ;f0eor 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 resista,kl91 bxs(spqf,b* f q:ratl: nce of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor havea5jl k w* j0pvck*8/eg a resistance of 6.00 W. The motor operates on 120 Vjv/p kcg0*w j*lke8a5 AC, 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 connected to a 2pq(/p;k( zu plk pq0z7/ok:xk4-V power supply. The operating current is 1.0 A. What is the start-uk/(p/;ppkq0:plk z kqo7 x(zup 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 resista3n5me885kj)wado gtw8 z,f ztnce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wh 8dkte)owmfzwgz83 anj55,8tat 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 connect 9s/jokuazgh -kgx9195 kz7hsed to a 24-V power supply. The operating c h zj-sz xkgu91ag 95sk79ok/hurrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltyr/,9u) .drp 8n7gygii jgt+sage 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 prj)7plq9g e pf/imary of a transformer causes 14 A to flow in the secondary. How many turns are in the secondar9g/f7 jqle p)py?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the (dv/ i;uo74n go(fv *nrltuox.i+c *x24-V second gi7 /vornnv4**oxxfd( i(c .tl+;o uuary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turyt a37p-e, q w;yrbffmk3d,o;n secondary coil. If the current in the secondary is 3.0 A, what is the kobr ytwp- f;;3ma d,7ef3qy,current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiency,4m s4q mt)tjg h+et92q how many amps at 24 V can flow in the se24m j 9m )ttgqhqe4+tscondary?

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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 t jhda/ hd*-rzg.:hgz (ransformer provides 7500 V at 10.0 mA. The primary coil operahga/h:z *d jh(zrg-.d tes on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its prd a/ n1xr9 2th.v,buaoimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what a r1/ hv.ud2bt,xaon9 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 and 300 turns on its sehjdl7b2zap7dp iwp r9 6a:p/atv v28 2conbip7p2ap 8/ :tawdh d72pvlaz962vrj dary coil. If 120 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 20.xu-qhy j8z9a0 turns. If the input current at the primary is 100 A, we can expect thejh xyqa.-9u8 z 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 tu ,rb.wr88d f w w :rb6:j8sguydowi09krns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can ex6,g8y. r fj8w:wiwud b:o rs8bw09dkrpect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns -jwo,9ye y9pm. If the power input to the primary is 100 Wy-myo, ew 99pj, 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 steppedmdyo * /tl/4,ds+g9 lhem9zxa up to 4500 V by a transformer and transmitted through a power line of to ,szth/*mx 4dylma /99lo+ gedtal 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 of current at 120 V. The voltage is usually st:lmmi 637gk) ayoj zr.epped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage polz6mi7 3m :gj)kr y.oawer 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. Thz2 n en2(2i caq4tzmc z5+-wpwe voltage is usually stepped up -2 4z(+2pcwztnqiezwmna 5c 2 to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not 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 cs*w ,p n)kt:qresistance 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 percentage kcsq: *w tn),pof 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 k; -.,ybkp7 t,gxtwpw r7nn0 grm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission lpw7r -n;b0kn,x .g7w gtty ,rpine, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. Hok9iq;2eiz8 dyw much less power would be lost k;8 q2edii9zy if the power were transmitted at 3000 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: 2.-sf ts3;eb7dq:me vlxk ey 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power l:eq xy d2;vs ee:3m-btl sk7.foss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the x3y)sn3 s.sv qcoil's magn3 )3 vnsxy.qssetic 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 contains9(5: z*a+7oq e pvlkipqmnz q3 a 6.0-W resistor and an 18-H inductor. What is this circuit's time cv lkpqa3+5q*i:zpoz(n9eq 7 m onstant?

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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 voltao) covkbc e7+:4r7ekoge 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. q2xf4+z:) px fowl3 :zp ,on5dxcd-afWhat 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 am* ve- e*p anulh 0h3qz1i92if 120-V AC outlet. What is the resistance of the lamp?epaqvml3 z-1hii 0 9n2* f*euh

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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 sup d )4 )z1i knr0;r+bz 9.fwaoct4pzzrgply. What is the peak currenbz z)4d. r0kp4 r)19w;aig+zfcrt znot through 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 power supply. ary)3 ebx/ zdjhzb p3bv:6p91What is the power dissipatede 9rybb6z) 3ppzh/xd 13v:abj 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 res ours)mpon 6y 57vt*6kistor 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 a1s+q 9* 4xta aejobmiv2h69mk 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist vco;ay i)akptgk651.or is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor a4 t5+p8h xcgvgt 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 at 100+rz+g;lu.jqul; 9p ez0 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 of inductive reactance?lqfvb i.:7pw0 k)f ;gw

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nec zsg) kn +jz/u9ycu60bessary 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 60-mH inductor when 120 V AC at a frequency of 20 ft0agtg9 k t)n7e2t2bkHz is gk 97 e22 tfatt0b)gntapplied 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.+0u6h t(9bdmoa m)fgu0 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 capacitor a8chhyh vt2+o zpf(9v2 t 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 (zz 6nx7 zrgz96;oj jpis;ot-is needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does d,yh5d 4k4 e2i8vywka 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 will the capacitive reactance of a 0.010-mF capr6.m va rlk d/sv8:u*bacitor be 100 W?rv.8ar m/kl:bvus*6d

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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 tsh)f3fro z 8ob5;zpo8hrough a 0.0010-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 olc*u-4k m8iq of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacuic*8-ko l 4qmitive 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 impedanc04f;jj ,)qembqyx0tbp 9wkc/e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF tjbyewc/q0,q pkj;)0fm9b x4capacitor 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 (xelhq k.oq03j5a1li-h +p8dl o vhf4 coil, and 1.0-mF capacitor 3 ofq8evl1(qkd hh+h450l-j a. ox pilare connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is /m1t;gm+oin xconnected in series with a 20-mH inductor, what is the impedance at 1 nxm;1/gmoi+t000 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 iq9jj50bdl0i vb60 h ijo)y;gis connected in series with a 20-mH inductor, what is the phase ang6ih)ojivq jl by009ijd0 ;g b5le 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-mFnbx(a;:8twv lbf 6 z.z capacitor for a total impe lbz afz bw:8(n.v6x;tdance 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;n/wth oc ke* j16d;wb a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz tkch/ oj1n *wb6;dwe;?

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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 500vw7v td*/1h*i5llwq, gb qlc+0 Hz for a total impedance of lli 5,ql+ 1w*vhcg tb*q 7wdv/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 beo.8sk 5 ,jwzcuzk m08u put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 k8mzuuo,8czk. j5 w0sk W?

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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 serietuqv 00 ,k7 xn8d+n i..hldqk 7mefru+s with a 20-mF capacitor. What is the impedance at 1000 u uhdq0 +i,+eft8v7 lnnq .xrk.dm 7k0Hz?

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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 cale pm w.;rfbz4oh0d,0uu1d4tw j:.egpacitor at 1.0 kHz for a total impel 04 u.j0p,wz.hwdt r;1f :e4ud bemogdance 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 seriesq ajvye:s+,6m with a 10-mF capacitor at 1.0 kHz for a phase angle of, q+smv6eyj: a $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needqgb+tu7v +3 xvk x,3eib8yf2wed in series with a 30-W resistor at 1.0 kHz for a total impedanceqk b,fu++x8v 32tx3yweib7gv 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 ayf647w y5 v0rzkyj 9pwt 120 Hz. What is the phase angle?v0497wp 6y5wrzkjy fy

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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 5.0yufb. c r w4 /4taav23rjw1z4q V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capac4jb/ quv fr2rzw. 144tya acw3itor 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-mF capacitor, and adq9 tt+o9ve9plp8ri)xi* 1 ya 0.350-H inductor. The circuit* d1itq lvy rope)atp99+89x i is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 3( yx-ef5 g5ow*dl5ps a0 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hzg(s-e l55dxpyf*wa 5 o 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 cir w8uedm+63as -c,g+lyc3db ogcuit containing a 50-W resistor, a 10-mF capacig-wd 8 omdbcg+sa3 y6lc ue,3+tor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500 e1ar4bpc1 d ty:b-nt3ty,* wa-W resistor for a phase angle onc t*1,arbepybt-y13 d4a :twf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. n1fa9qyao2*- j cbf3cAt what frequency shb 9y*anfj1- a 2cq3cfoould the circuit be 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 wtxu,zw7bu xvef 3y,x/ 3xn*1an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10. 7vfb,u 3w/u,wx3t*1yzx nxxe 0 W 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 uhrwm is8ik2kkj/3t9z h/41b 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 resistance of 30 W. 2i.* wrij 1r( lt-dmi7uef5 (and8 ob(a o3sxw What is the power f 8r(oab2(do- anxldue5r.ii 3mwi ftwj7s1( * actor?

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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 facruhvxep8:i1hvs wmf4 v9-zqor0q.2,oc0 j/z tor for a series RLC circuit containing a 50-W resistor, a 10-8h,4 1:juv .hczo2qze9wv rp 0vs/qmi0- oxfrmF capacitor, 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 y/y9/xse9+ xn+fywi fseries?i /es +9/nwy9x x+yffy

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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 an0.pcl/ta ulbzvy 3+x*u8 mi/ly d i;5 4.7-mF capacitor for a resonant frequency of 10xpvuc0 i 8//n*.ldt;b5+ialyulyz3m 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 witenpc;h09i 6 0wt44q qgxk3rci h a 3.7-mH inductor for a resonant frequency of 1000kgwtp;3 e cq00946c4 iqi xnhr 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 placed9te,f69e-cv yiifb h 4 in series with a 30-W resistor and a 40-mH coil iffey9tic-fhi,9 4be v6 the resonant frequency of the circuit is to be 1000 Hz?

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