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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 mc+;* 6 y3d.ztkvpv*-w zogmygagnetic 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 :,ylaau-cb 8+z4iaou 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 2e 8ow e,e/(hgo vv4ercoil produces what kind of change on the inducedr hee2ee v8/oo4g,w (v $emf$, 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 off3hb54y(8t -y mvsqzs wire produces what -sy fh (yv834tsqbmz5 kind 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 m abya3 6z1twx,1j on;produces what kind of change on the induced zmb, 6jawo;yxn3a11t $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an k2jn6 h 5h52y vvzph9x$emf$ 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, th;2(unrpsbh2 he direction of an induced current in a conductor will be that which tends to produce which of the fol;h 2bsru phn(2lowing 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 aex/uktw /9k w5o r74uti)2fzl horizontal table. A bar magnet is held above its center with zitw w9/2u/ l4kko)ret7uf5x its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magx8k82eu ir8x ynet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fallingix r8keu2y8x 8 magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field(apuyv; (-rm*ojts b: vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the ind bvs(j;-y o(*upta r:muced 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 topixlbaw;w4kvz+h ;au ;4b) w9 p in a region where the magnetic field vector points straight up. zb4ahb 4)ak vuw;ixwpl;w9 ;+ The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizonf94bg wf ; 1gv7aq*fqw/dyapywc a7h)iy6 +:ptal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dir47aiq pgq+ d aafy:)w;9wy*yfv 61/gwbpcf7hection 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 l6 jcc)s jqesy(+79 lzcies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Wheye9)c6sj (z7cq+ ljscn 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 the4+ j ke1ayc/dp north pole entering first. As the north pole enters the wire, the induced current w4ya/e1c+ dj pkill 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 wie:d* on.tuuw,jcj;qul9.j a(re is rotated at constant angular speed about an axis whose direction can be varied. In a region wt*cj(d9u j, l u;w.j.ounqea: here a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 sp1ks29t6ae.j34 mnlcb .vpilleed about an axis whose directb1. 3e24lpks.cljv9tl mnai 6ion 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 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.r ,krzj-m.:n, jd7v bs:,gby(yjxk7x
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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 gyc87my -4lfcwxu .qrmds5(1$emf$ 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. Thp1ut66mw:1.l7loalcy ld j6xf /jcm .e $emf$ 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 moved northward at com hdibad z.4/vrc95(cnstant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced a h/9i dcdzvmc(r45 ab.cross 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 rota4/ku 0sbya*frtes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator o2jq c 8tqrev1 vz6l+2transforms

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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 revolutiontabx3yq ngud82x/vg3n,6 /th s each second. The frequency of thegngadx3,t2//qvbn y3 6 8utx h $emf$ 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 gzml 4ymi+4b d++q mu7used 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 dev7j3v v. gkncts0*u0 uxice 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 loo b:gzcros(a1:kk8 3i zps than the primary coil then it isz g: k38i(rk1:coaz bs 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 conta5 oy6pm(q ed2sins more loops than the secondary coil then it isps2eo(d 6m yq5 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 inputmw 7zratck,f6o* pi, 7

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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)/ jmwamn7p2u .rzp +n 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 connected in series to an ideal battery ofzb2nt 1a6h;in 35ewsf constant terminal hntb6sw5ean3 f2i;z 1 voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to vz8*lxwyo1g*oia 3 7i/p) fzzan ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is*x o7l)8ip w/*ao zygz3 ivfz1

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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 inducta:qx+ic8:j uwna bcw)/ q(,vs fnce 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;r gop(o( :0qmw ujij l*e9rmoa::i(pe 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 connected in series to a battery. c .tzb.sujtv(-(jcs9o 8.iiz The time constant for the circuit represents the time requ .t8.zb-.s (icvc9is(ojzt juired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery i; g/bbejec )t6pn o1b7c2e5n,5 niehps suddenly removed from the circuit. The time constant for of the circuit p,nje5eehp /i6gc7)t 25o en 1bbb;ncrepresents 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 unitxmyft nw;; 2v7 9bap,5s6c rlts except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuitqxp o9 xk ,2yt*iq*a)r, 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 ACx7mi,08 ouup c power supply. In this circuit, the curren uuiop8c0, m7xt

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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 circ+e99slqjmiz/s- crh f /8tu8buit changes by what factor when the frequency is triplemsb s-h9ce8fzj/u+/lr9iqt8 d?

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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 induc91cz ze)xi fj*fk pc.+tive reafkjc*zz)1i9 fepx+ .cctance 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 inductor approaches zero, :d6r(3wl2a zd )sbttnthe inductive reac3 ) 6zsn:tba lt(wd2rdtance 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 f5 )wx6pn7p zzto an AC power supply. In this circuit, the curren z)75p xznpfw6t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when th qe,v;,rsv6lbe frequenc lv;vs,b6 q,ery 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 acrossua.n kszvrfcs6g* 3)iv3sk 1 6 a capacitor approaches zero, the capacitive reactance of that capackaf.v1 6)ivgn*rk6s s scu3 z3itor

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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 anglet,xa82 suq4 :qkurv5l2yzm5x between the voltages of the inductor and capacitor in a RLC series circuqsy ra:84k z5,2q25u mxvxtlu it?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circu boyd;+ *(nhnoit 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 inv :s4w khe10lbcreases if R increases. When is this statement trueekb 4s:lv01hw ?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circu:o-hzhrp yhg6-hb(j o3x,;vt it. The impedance 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 impedance of the cn /8v1f83nubb5bxf z *xvalp4ircuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit,:71m opxsl1ll5h8 bxh the resonant frequency of that circuit willh81 1lx xll:b7shmo5p

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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 resona3jah(k0ss 4 zqul66oj h5ad8xj ,5ocks0w/dunce,

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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 RL.xvz0 mqs)f:zmk t)p/dm37 jv C circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magugs4vl(.q7 q;0 /+kkz guaj grh2r 0hxnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loopqa .rg7k+vhq4z0u ;j/xgh g(u sr0kl2 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 *u0nv.i 7nktiof 0.20 T. Find the magnetic flux through the loop when the plane of tk0ni.7tuvi* n he 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 radr:* g oxrnzee8kjw+q5wgwoka9 cm 69 (: 4hg1gius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whx8nkwcr kw9mzrg+a:j:qeo(5g*g 1o46 wh9 ge en 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 froml4wzo2f- stjh3k s)dk-2) y rg $1.0 \; m^{2}$ 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 from 2o 0knw24.olul me g0m$4.0 \times 10^{-5} \; Wb$ 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 fassewwfym+8 l*sm m4n8vl+3 ) rame 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 value of th 8alv)4 mf8ly+wsn3 +mwessm*e 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 (q9nl01h+qfwg;met y 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 ar,*boxulo,9w d f7ea5gea $0.20 \; m^{2}$ 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 spaphx a/nbkw78q6)l0cnn of 60 m flies horizontally at a location where the downward component of the Earth's magnetb 8/la7wpc6k)qnnx0 hic 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 barm4ryb)+v4i;vsbi p4/0nhfz ,wp)o zl that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fp y+ ,bz ) brimo)pzf 44/;0silvv4nhwield 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 ad a(02r:mz8oe3 idfgof $0.25 \; m^{2}$. 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 turd5gnc:y;/kyydxdr )x-8 d(+voah e 8cns 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. eq,iivz9-5k1b 8 w 5dwn vijy0 Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output5-ez1n wy59k8q0ijiibwd v,v 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 100wpp4)ia9, e/cslv-sz 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 generator with an output1y -y/8el vixr of 12 V maximum when rotated at 60 Hz. A magne-1yei vrx/yl 8tic 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 maxid egit7hl-7u9 29v 3tjqjgq2 zmum $emf$ 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 rs1pyoj 06(cmuesistance 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 have a resistann*zh n xc0+ jzm9s7eu k+2.xlice of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generkzs 2 h*nxx.0 lji7zc+9mne +uates 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 24-V power supu :+-e zhu7yat-ephnm9*4skm ply. The operating curre7+ e4taku nm9ye *-pszhm- hu:nt 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 power supp3.zltid n.rifsi.q 20ly. The operating current is 1.0 A at full speed. What is the0qdfrnil2 z t.3i.s i. 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 intern i99g4;qvf7- tac;h.ireyi dl al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is h .r eia97i4y;-tf c9lvgdqi ;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 acjbl14:j f0 xprimary 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 to flow in the seconuaho:0o4 hhkgw :sh-o:i3xd 0dary. How ma:ho-hoxi0 :o :u0hgwka 43h dsny 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 primary if the 6 uoan734jr mbmlmsko vo6tvov;4:; 024-V secondary has 100 turn n:6 j 3o4mm4o;vov0 mo6lkvbstu;a7 rs?

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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 coikwc (uzdt gj(bd3 m656l and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prima3cdt g(6 jdm5w bk(zu6ry?

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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 w5ad 3g n2/5v q qkb0d6gg8zcea transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secod5azcg8k2 0 edqv6 qbg3w5g/ nndary?

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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 provides 7500 V at 10.0 mA3c3 +bw9e wex,bhy1sc . The pri 9 wc+,yhebexcs1 3bw3mary coil operates 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 pam x;e-j+ jf*qg aq0 kpx(;hp6*i8gv nrimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vx6x ae-(kh*;+ 8g*vgppn iq jm0 qjfa;oltage 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 turn pd8 9jlhqqy-;s on its secondary coil. If 120 V at 2.0 A is applied to the primarp8q;jly q dh-9y, 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 haso py2 *8yuatk5 200 turns. If the input current at the primary is 100 A, we can expect the output cu p28 akoy5yu*trrent 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 turns and its secondary has 200 turl k g7 vahk*ayq/w7h4*ns. If the input voltage to the primary is 100 V, we can expe*qy/ghwvkh77 ak*a4 lct 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 1009vvvy7ah i.lzer .t; ; 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 (neglr tal97vvz;ve;.hy.iecting 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 volt.nft:.jlde2 5rgb pl(6f.sf hage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary hap(n.dlbjffe6.fs lt2gr : h .5s 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 ir6-l1a /war/(u z9lvh vj goq8s usually stepped up to 4500 V by a transformer and transmitted through a powerr-vaowh/g/j( lr v1 ql89 az6u line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppem a 1bdwvl :5(+ifu(tad up to 4500 V by a transformer and transla :fm+b i5w(vua 1td(mitted 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 resistance of 0.60 W. 2/fw:b3 bwo) lwjoxb: 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 be lost ifb ) jw:w:fo2l3x/ bwob 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 */s f q6knejq*ibg)t) 50 km 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 line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What b)* jsieq /)6kfg*qtnpercentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wo lh+9)dx vj kgtfcfu+d;;2+zvuld be lost if the power were transm; hj ++)kd+xfzludtg2;9vv fcitted 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 0n0w e +gdbe9nis 440 V at 20 A. It is to be transmitted on a line with ge09wn +dbne0resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a curren3eqhhe y xb(l 6:l7x9yt of 5.0 A. How much energy is stored in the coil's maxqx l3 hyhl e9by:e7(6gnetic 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 1:(m p)hks3w 8f.skv uh8-H inductor. What is this cik puh :kss f3)wvhm.8(rcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak vol mb6n/ as/j+ 2ex3 7x36ectyd7c zsfrktage in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V A jz1,.;d)xjjqbuov; thdg j37/uq/.u)ni ohdC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of thqct20e b2zu8q ga+o( ee lampz2g 0qob8(2ea cuqt+e ?

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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 bbt 5*u/yz+xqsupply. What is the peak current throqt 5xzu /yb*+bugh 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 ax. fzatg024 m v4bt4bf 120-V ac power supply. What is the power dissipated i4vfgb m a4tx 02t.4fbzn 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 0 w 5:ybvj.wo9yn6 ite50-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-Wutf9o j* ya7y;q*wvxc6ty 5v* 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 lk9zeb mqk n4i900,qx* i8ctba 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH i*sl 8xh 9ct5oifm aa;dhk 296inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance ofo/ks ,0d,kqmqi2q -loem5(sg 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 14nl 2*0apa2dqp *auhj8 .0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactau.xe4a 7 eou+z, rai 2,k)cxoence 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 A1bh,s2g. s9d/o nhmjmx.i 8xmC at a frequency of 20 kHz is am d8xhn2bh xs1..i ,mjom/gs9pplied 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-Vsg1 x1a.n,ogb3y+(w z v ikvv), 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHz7aoan7m**(o iw i;4 wcvuroa1?

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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 5s0jrlmr zr*3 m 3mgyb*w2 b9m10 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 v dcvha-a;1had+ kv0 (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 0.010jp6+a( uzgj (wece y-gz)1 lc/-mF capacitor be 100 Wug ey6c+l-e(1/jgpz )c (awjz?

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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 capb / mdzzbn9tk+ o3u)d*acitor 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, 15nforbxn6nfw *0d ;*;e.0 W inductive reacr*o nex *fnfb; n6w0;dtance, and 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 co7axxq. 1rdiu34s r m.;xwgzm0rf0 fx7vz;9k dil, and 1.0-mF capacitor are connectsz 3xrxwx 0i.ga7xf ;mkf q.m74 ;r01u d9rzvded 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 15g a b6/xht1fe* joe;b2uk5pe.00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriupe.ob1x*6a2h 5et;g /ebkf jes?

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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 con/ls3r tp 4ly-xnected in series with a 20-mH inductor, what is the impedance at 1pt-x ly/3srl4000 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 resistor8ej r7g +(/uas)yynik is connected in series with a 20-mH inductor, what is the phase angle at 1000 Hs( uk/ eg jry)7ni+8yaz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capa2lrx11yuuv ;6 w)sj5, eycenr citor for a u )6n2; l,jw yecvsyx15ur1ertotal 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 is8wl /ws67+m8do v llvy needed in series with a 100-W resistor and 15-mv+ yodl8/slvlm 6w7 w8H 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 45ffljs6 ka68-l 0-mH inductor at 5000 Hz for a total impej s 6a6fll-8fkdance 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 ;+:az t2cs )*nr tmbknbe put in series with a 100-kW resistor at 1.0-MHz for a total impedance 2b;ksn c:m nt*a +)ztrof 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-e9jy*c lf5n+h4.nqox mF capacitor. What is the impedance at ljx.9cefhn*y+ o nq 541000 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 d5p8 vye2 m 8ssb;eyj-a total impmje;sb-ysde 2p85 yv 8edance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz f :vz r58toyan.or a phase anglen8:at 5z.yo vr of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz fogg, zjn r1l:d fwb++6er a total impedance of 45 Wnrje z+ g g1lwb,:+f6d?

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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 120b7ksm*64reeql.xii h +u:r4 w Hz. What is the phasmei4e x.sr7:q b*wh+46ikurle 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, 20n00a wxotgmc1n)gm 0i .d9 1pk-mH coil, and 1.0-mF cag dagi.p10 wtc mm0019)nxonkpacitor 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,ipi3ak(x8cy/8qjm7 v and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What/yv( cm8qk xi3j7 8pai 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 reac* den lm*e,er w0.l1xxtance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-ee.e 0w1l ,xl*nxd*mr V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series R8e* mmq.ktk n2LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to2m.*mk8tnek q 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-Wkpzua3*w8zo/1y/ emr5 xf r/e resistor for a phase angle of8ao5r1k3p e//z rwyzfx*e mu/ $40^{\circ}$ 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. , n:ompv9ge/r*pvky(8tp ro-0 mF. At what frequency should the circuit be driven in order to have o-rg/*p(oev,9nty rpv8pm: k maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 1a7 u-f j.q3cnu01s2b;x w:kjlirxk+w5.0 W inductive reactance, and 10.0 W capacitive reactance, when thenu 2+f-k0jrja bs7ww3;1x :cx i.lquk circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is ofz 4suhyu+hz3 .bu9gn 6yt7/$63^{\circ}$. 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 impedancwgd s fa m)zbt* j+w(mq66x-u(e of 60 W and a resistance of 30 W. What is the power fzm6 uw6 +-mjat* sxbgdqf((w)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 factor for a series RLC cl.( ezgm/q:ai ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pomql(i /.gez: awer 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 seriesj*.ka uiho9c .jcx6:p 4 *fizm?49 .j* pcfj .zhkoiua*m 6ixc:

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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 seri gm++kp)xby- ies with a 4.7-mF capacitor for a resonant frequency of 10 kHz? yim)px k++-bg

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a p-wbbfd.y.6k tfaxc x 80ddic4vy* :,resonant frequency of 1006a.:kydf* fc vb.8c 0y-x, tid4xpb dw0 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 kilt/v) r pgz47d;wc8 a 30-W resistor and a 40-mH coil if the resonant i lv8wzr)ck ;/gp 7t4dfrequency of the circuit is to be 1000 Hz?

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