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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: 游客未登录  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 ofwk l jhp +b.dsd+je2.6m k1pp* 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 thq6 m)op 5epso/ne k5h;at 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 lo6 4ftap pte1 7jz-ax.)h6fi/0khuv y oops of wire in a coil produces what kind of change on th/yz7tpk ht6j)fp v1f0. aou6a4eix- he induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wiren0eyum2 6 * qr5zlik*a produces what kind of change on *2mqrai*6z0 5nl yukethe induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of uvo /*+x:yx :pwk5ydjrd-n l:change on the induced p-ydxvd:*j / o5w+y:nxku lr:$emf$, 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 magnkbb6t nw+)/ d 6qun(oar-v.qs9nk.vzetic 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 dus211fk9c4 jawj f r)a conductor will be that which tends to produce which of the following effects?j1wd)jfr1kuc249afs

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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 -rxgn.jrry 22horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abo2xny rj rr-2.gve)

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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 au(ylu8 j,5wx m horizontal table. A bar magnet is held above its center with itswx(8yuj5,u ml 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 in a region where the magnetic fk y/x1o ep7lbgz1r omh)g)+sr /7ia ,aield vector points straight up. The magnetic field vanishes suddenly. When viewed from above, r/+a ,or ba)x/eilyzs km )17p1gog7hwhat 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(;;qkvmhmhm ; level 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 thehq;vk( m;mh m; induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in ygpq6o 2qb+ va/ 4t9h ec.if1qa region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced cbiv 9t o4qy1 h/2aeq6pgc.f+qurrent 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-incre tuy42ttco,,p9mz *wnl6nj )sasing current northward. Two coils of wire lie flat on the table, one on either side of the wirtuno9ypcjtn,6 )w 4tlzms2*, e. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. 4 wb /ylbn 8.a zb*b3j(:lkfmh As the north pole enters the wire, the induced current will be (as viewed frwbhfbm:/lyb8a( l.j3bkzn4 *om 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 b ( ngz7dna;te-sr7clvb .h4. 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 bsl77g ;edna(c.brz.t4 hnv- 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 aboutzs y;9cxl5xvjvrf)3.hyj (vfwob84ye 0r1e* an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the or f 58 r( zf h*v vysxybexc4jjw;)90v.ye1l3orientation 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.ak2ox5+ech5 qqur:y c4b;m5 s(8zf c m
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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+qlm-xxd(23rd(chvm vw:h w 0 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. Themwnawd 9jr2(; zm;gy 2 $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is mov2o jqmor9a tg(u1,k3ved northward at constant velocity through a magnetic field that points straight down. Make a statemem(j ru39kavg2to1q o, nt 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 constant aepqqlbz cj8fb5w/r w f3 s9 s()ku0f-*ngular 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 7p fr(6(saon/7c q cwytransforms

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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 -s;cf7 ot)v7a *bs*jtrr yit n4 +,s: qryk(sf60 revolutions each second. The frequency of t ( vikast*ybt);j+*r-s 477stsorffryq ,cn:he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used-4;noxs+ gfutoj*r 4x 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 devd. +2h+xexe)q j p+rhc14omexice 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 mw dor9v l3;07vemo,xloops than the primary coil thx3l79rmw, ovdv e0m; oen 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 than the se*uhywlh j5ayicsne,9w i- 72/a 1vvq :condary coil t:*w1jy 27hswi9,v- aelanq5c hvuy/i hen 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 inpuf w(j* om.ds( mwu33 tkcb;y5bt

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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 resonanpmsx p0) wx8c,t 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 inductor are connectiw, (t)l 4vke+ b5ciyfed in series to an ideal battery of constant terminal voltage. +(fvyet4i icbw,5)kl At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected iu(663rrvho roz*1x own series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, r1 hroo6vz rxw(6 *o3uthe 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 induc;l-w19hjnrqmkd9 ig g( f7 ui*tance 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 resis4 a5v 4h /*ei3otd 4phv:d1ucx2wfwos tance 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 connected in series to a battevvs q8: h03homd hpk(+1l6qhj ry. The time constant for the circuit represents thepk:q(hq+6 mhjsoh hvv8 031ld 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 connec g*4i+zqts(tkuu 0 fcs),jv-gted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for th0 g-t sz*utk jf),cg+iqu(4sve 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.wxkb( 1gioo0 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 thisa )p,3 g8t*dh r49kky nhxl*rksa;cp . 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. In thi8gk,p to h9l l)x4q9fds circuit, the currentot)q4gd k pfx,899 hll

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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 whato:w7px0 vj*)/hblq hq factor when the frequency is tri /* b)lxhq0wv7o:phjqpled?

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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 vol.a;x-odga r)ztage across an inductor is doubled, the inductive reactance aor; g-.ax)zdof 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 inductor approaches zero, the/q26(o-y uoxqd89e: g,l kbstl,pi r g induc/qoge ki2pu t: los,qd-9g8l(, 6xy brtive 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 ACj. rzi 8/k,g3jekkzy kl3z)l) power supply. In this circuit, the currentkri,zz)yl ze j3k.k8j/3k) lg

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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 ff1bec shq)7k7actor when the frequencsfb7c 7q )hke1y is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the c9.d*xxvk 5n7o- npkl capacdl. *n n5- cpvox9kxk7itive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor e w.c yv/ihgl9a y2zwa2; fp.3zre 52dand capacitor in a RLC ser39glf 5yca /w ;r.eeai22h2w pz dzv.yies 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 cijo7 h36(zsouhrcuit 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 increasesx4s4d 5 qt,i3bat*tb z if R increases. When is this statemtdb4st b3tq4,i x az5*ent true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increakzjah0v c 8:q4ses if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit in4- wrkchh ,e,bcreases 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 q4 aol*wyg:t1 series circuit, the resonant frequency oflyqa*og t4w1 : 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 voltage. At resonap.9 umu ybt;(unce,

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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 occursw-9olz d5fszo( pf t*. 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 0.2hq-lrf o(j *xd3ervr75j w*a ,0 T. Find the magnetic flux through the loop when the plane of the loop an*dro ,(ajql-he75rf3jw * xvrd 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 radijvy-ahb ;-p0,z m9i2qqaen6u us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the m-ej-a0 q6z yiq;nm ,phv29uabagnetic 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 rfnzr k:x +qyr.*r*tn5 adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Finrfkn.t :*xr+ *5nyzqr d 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 adjustable single loop is reduced frod 55 oiagpsecn0 +;z hg+lfg;*m $1.0 \; m^{2}$ 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 changxf/q ms 8bo(vshl 2l74 6z,mz,i+eznqes 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 f ,oiy akgo3l:4rame 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 averagey:l,o4a3k ogi value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of6p ng;gna p54d $0.40 \; m^{2}$ 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 arjb1op83-5gguvb/ ysq ea $0.20 \; m^{2}$ 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 horizontally at a location whereoln4rd oc :qo)k qp:9. the downward component of the Earth's mar ponl:: q .ok)o4dcq9gnetic 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 rotymd o0rf 0bju:s2t;o, ates at a constant angular velocity of 2.0 rad/s about a vertical axis through one :bjof mo,u02ydtr s0;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+rgpw f;q5 sxh9 *col3 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100/z-;h4:uafv;rq c h bz turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loot yo j30ix5tlio ;hj 3n1 *x4sba,,bkrp 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 rotation, what will be the maximum output voltage ofotk,3t jboh0,b*i ;jyarsxl 154 3inx 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 consi qgdr8 )-r* u5sxuu3jpsts 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 constructmzxqjn;,hy 97egq c4ia2n5-q a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic;hzqyg2n5m ane iq7q4j-x c9, 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 a maxime u)i -xsb+pm7um $emf$ 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 resistancy9y yf16n ;i scds15oie 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 motv6 ux5o /r5t+k1y1oxop tb0zwor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed okbp5w0zvo1 r/6 y+5 txt1x uoit 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 co7 jw4 9 6tuxzk60:m*c5a1y uviu ysiesnnected to a 24-V power supply. The operating cu 15zumtuywy 0*esac6:7 xs9ii kv64uj rrent 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-nlj lty2 bks1b39ddx;s7d c7 connected to a 24-V power supply. The operating current is 1.0 A at f s7x; k7 t1cny-bs9d2ld jdbl3ull 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 p:m,mz90z 3 nzbjm0)aozk2 *vozg6 vtzower supply. The operating current is 1.0 A at full speed. What is the bac:v zz 6 ako0mm*z2z3z,nz m9bjg0o)vtk $emf$ 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 qt)+l; 5sj(lugue:x qreduce 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 tghrpuo ew7* 17m) .zk+wjwjl0ransformer causes 14 A to flow in the secondary. Hrmw7. +7*ww e lhj0) z1ujkopgow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primabs z p---o ;pfo 08lmvqi41hlxry if the 24-V secondarpv-xz4po 8 qh10 l;--mso lifby 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 pri,ftr* 3 qyvmr.mary coil and a 2000-turn secondary coil. If the current r, f3.rm*yvqt in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the pr +s5wh tjxf su6(+4nasimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in thja4uwhsf+ sn5 t6s( +xe 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 s:fp:bb2 f gjsdchljzt (331t u:lrjfb)9y0h:ign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pri:jgr1:9 3 yt2)(bplh f0jlj fudt:hc:bf3szb mary 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 a4.jk.epk s/bnfna4w2zn jz 7j(o):zw( zbx: lnd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage z:oj7a 2b(x(pwskn4jke z .nfbz/) l :nwjz4.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 ond65 +)sno.sy/tuj cy;p .tuq v its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present i6vu; t coun /.5d)sj+yy.stpqn the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns an ikh fq0o +z5:q-y;xc8cu :b5 oltu(cjd its secondary has 200 turns. If the input current at the primary is 100 A, toc fl:-okcjb+c uiq hzquy(x55: 0;8we 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 transfo*2vec1jtfo thh+ oe74yf*j* trmer has 100 turns and its secondary has 200 turns. If the input voltage to the primartjt*2*fv oyf4ch et1jeo7* h +y is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its se6)8fkm +xhh clcondary has 200 turns. If the power input to the primary is 100 W, we can expect 8+cxm fklh) h6the 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 gc6 i h5i ht1undmck w611-wstd/t- 3musually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of tur-13ic1t m5gi/u- 6 sht6 nmwk1dcdthw ns 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 605ew ot6) ggw;b A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission ;wgtbwg5o)6e line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The x6kzm)hoo . y0vfxof.;:n-p fvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission lineo x o.n-fpfo:.k;0m hx6yzvf) 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 hfi )*rime wp53as 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 line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would wfiim5pr e 3*)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 sy) r0,y -rxowb((x kxhas 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 line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the t(-0yr s,)rxyo k(wxxb ransformer 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 transmittez +iesqip2 p7 -d7avm cl17n4o;ipzw2d down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead odwm7l a21+oi pz7 2e- 74pviis np;zcqf 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 49vop- )pf sl*w40 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage w)p pfvo9*-l smust the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the ca 25vig;572eelvyf jk sj68pwoil's magnef 2;wp5v sj7e8ky v256gjali etic 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 resie x6u 0eay)5ysco(8tjstor and an 18-H inductor. What is this circuit'yoe5 jxcuy(s8ae06) ts time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit whece,v 2uq6fxj6m- k vyyoof 2;.re 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. What is the peak current?q)n:7 rgq2fln )h;.luuvfgs5

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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 resistance of t6japou92 q ku8he la8 9oqk u62upajmp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the7emsmwx80m az (u/ u/wb/: jip peak current through sxbm //j:0z7uup ( em/a8w wimthe 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. What is the power diss*ad i 7zj x5hx3;oqzqw-x0p:v envg.-ipated in the resisto0 ;vighw*p5e-.qx3ozzq d vj:7 xx-anr?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through ap p7fk4jo *6vz 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is -d zitk+0afu.2yyefap*m;l) $I = 0.80 \sin (240 t)$. 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 lqocqc q qxz9p(h::.3 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 of a 1.0-mH inductor 5p w4:kvw7nyhyn f *-pat 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/v wsg+;jcbl6 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 have 14.0 W of indu-4cw)emr 1fm5r 2jxnjt/ b j6sctive 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 1000 ,t:ww2fx atm,c livb7 :;blnqyxc ..: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 ofc3vdn 7ahs qw-kn7j )6 20 kHz is applie-q 7nv3 nhj 7ca)kdw6sd 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+9 u v7bsilch5g9ze /x1zvo p: 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 reactan3b5b ib1fpwbs,)9mitv 3ghxjy99; ne ce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor isoj k y6gcf0i -pa1s3)ow9go m* 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 a 10-mF caij ax/(vxos; (yhsesqp*b37t5mj4 4bpacitor 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 tt4p -ufr )4t *vjyzs4w *jsb/a 0.010-mF capacitor be 100 W 4v t-4j tbyutw)4s/p*z*srfj?

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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 thu9cul0ssk 7( qrough 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 of an ac series circuit with 12.0 W resistance, 15.0ag i3o tvo ex;yd0(z8+ W inductive reactance, and 10.0 W catev3yz(oo08+i ad gx;pacitive 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)ueyb5- 4 vjxa z/i+sh if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ue v-ah5s+ jb4)/yzixseries?

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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 resist ms/vya(g.3 jfor, 20-mH coil, and 1.0-mF capacitor are connected vg3yf(s.ja / min 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, ewc c3d( e6:v-vuan+lc38xqjwhat is the impedance atcvxn qvd 3:j-cec3u(l+aw6 e8 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 icj-ydhxni) ,vl- btc5l47+i3u gmta(s connected in series with a 20-mH inductor, what is the phase angle at 10 ,)u yim37 t-lci4 d+5vnhjgt x-lb(ac00 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-mH9p(kg *rmnc; osny+o ,gq+b10f sp:c b coil and 1.0-mF capacitor for a total impedancm ,9;oysn pp+:1bcqcrgsf g(kn0*+ boe 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 ibzh ;nm16)xvvxd tn4.o j,6tcn series with a 100-W resistor and 15-mH coil tozx n.xtv6mv6 1dt4c;n)bh jo, 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 i vjt sey-aslqp;ax46 *ms/,p 1y .4zgat 5000 Hz for a total impedance of 4s v*g/p-ms6y a; ql1 ta,.j pix4y4esz0000 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 1.0jhzmd+a3k 9 ;ipvz,n wrd,6v6 -MHz for a total impedancmkvn3 6d6; ra wz jp,d9ih,zv+e of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacz d3z0/wc8cf ikx/ kl5;oj s6eitor. What is the impedance at 10wk /ic8jxdz e zlosf;5/ck063 00 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 1)ve,6(o sjg6x4bh es i0-mF capacitor at 1.0 kHz for a total impedancje6(ihb,ox6)sv e g4se 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-, i9af,bsjk .cxh3w8d mF capacitor at 1.0 kHz for a phase angl,fjk a3.b,9wdchx s8ie of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series wi( a+uvvvy,1mdth a 30-W resistor at 1.0 kHz for a total impedance ofv +ymud 1v,a(v 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. ),6h 4cc/nfln:m u fjf What is the phase angc6 f/j)f4lnh ,:numfcle?

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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 j a 8rq7;8su9) 5scde2d3j ymskykac+1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF+cd8y sk ask93d j2y7mu5s8)rcj;eaq capacitor 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 icnp: dq16bq 3iw.d,j u *vly3of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. Thw1 pqunqcbi * .d6l:jdi3y ,3ve circuit 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*yw km;h4k;c)ak ; nrr, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, kh;y;k*4rm)r; wck an 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit co*,gn0zxpw uy /87fcvjd.el 9antaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pow. e8*/ ,uf9x wvgyad0 pcj7nlzer 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 resistotmz7 frm gy x3) 6md46gch*5ksr for a phase angle of )cmd z76ms4*mgy tfhxr kg356$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequep/ldm4ij++emt9yxr- ; u duu+ ncy should the circuit be driven in order to have maximum power transferred from the driving sourcyuu d- l+e; 4/ut r9j+m+pdmxie?

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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 resistance, 1t97*xoezn x,h 5.0 W inductive reactance, and 10.0 W capacxon,x7*hz9e titive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC 3ri ( jfklu32y2 au*6uwlz s-ocircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What iz)wwv5rbhe8xzc9zv ki*282b(or xk p5g *8nz s tzg nib8 r o2v pb5wr9 h28xve5)wk8zzc(zk*x *he power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, asn9iclq l; p/z-: p9bg 10-mF capacitor, and a 0.45-H inductor, when connep:pl b9n 9l q-/g;zciscted 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 frppq+1: sgfzi x11i 1geequency of a 1.0-mF capacitor and a 15-mH coil in series?zi1 qgg+1is pf :xp11e

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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.a9gwr6z+w ul,n-4 ij r7-mF capacitor for a resonant frequency wa r +ir-6,4ungj9wzlof 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 i;7+n4su c)fp ni cwb+inductor for a resonant frequ+bp c;is u)i74+fwncn ency 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 withl)d-b/lh/k2zh w rt w q3sw)*jm6 ts9g a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be d w b*wlh lhrk2 jwst3ms)-g q)9t//6z1000 Hz?

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