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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 of magnetic flux excepo9e;:p )rp khct

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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 statr9,pso e37eo ues 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 kl hw8 o 5:spd1jahp3/zind of change on the induce o3 azd8hp/p:1s l5hjwd $emf$, 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 wire prpzj:rj-mrt0i(f 28yvai j +3woduces what kzjy (-pai+:r fr8wjit3vj 0m2ind 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 whatyjp/a; ,b y-r.cb cpf( kind of change on the induc ,bjr .( b-ap;yfyp/cced $emf$, 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 magnh 8t(. k*kw)re3pchtxetic 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 conductox/ kqya z 7 -k+kmkp.mc98pj-tr will be thk 8ck9z.m kqm +p-ptyj/-7k xaat which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies f ivc0m.zd5 sqvk4,3b rb,fxd8lat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. Thb,v.vdqm5bc0 i rksf dz ,483xe 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 magnet is held abo 6lc)e7tf (x8u,li)s9z 3 mi4 t1eoijywclm)m ve its center i4wfmi t,l8uc1l7xsjm ecmt9lo))e ( 3y)6ziwith 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 in a region where the magnetic fie ;2elp34xhflj)wp i7rld vector points straight up. The magnetic field vanishes suddenly. When viewed from abx)j;7ppi4lwl f2 h3er ove, 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 t450il xyqtpbc)+bi9sh5 f2f fable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the in+20bftiybpcqxfis l545) 9 h fduced 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 a region where the magnetic fieldmjw.c : /blso8o-5g pp points straight dow:8/5lo -mgc o.j pwspbn. 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 carr . h/l n-3dto-sm1az2hw6yyolies an ever-increasing current northward. Two coils /l2d .nw-1mtho3o-zys6a lh y 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 wire with the north pole entering f4 pi*yvku0.b : 8py oxjd-qk;cirst. As the north pole enters the wire, the induced current w4q:pb- yu*jy;vdkcxo 8k.p 0iill 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 angular speed about b.l 3aywt8nowx 59*dh 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 rot8wy b*tdnax5w .l93oh ation 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 ci-qth+ 9ymh 0at constant angular speed about an axis whose direction can be varied. +9hch t0ym-iq 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.+5sf* lfigqe47l,bcd
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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 - bx-v i*j:sfc$emf$ 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. Tphofpnz4nlh17n ti4*0zz p g.f1k4p6he $emf$ 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 (orih7.td9zul mjm03ya9w ented in the east-west direction) is moved northward at constant velocit.m7y0hzuw93 atd 9 jlmy through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a wug;zvf, u7p*x1js (mhq3. gi-vupv5 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 transfo(skczrhy 9b66 m dt1y ke7-mlxt 823girms

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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. The fre;rf+r*(2yjbpo b)pcbnmx u1xc t-k * j4l0ua1quency of the yt0xf-2j 1b*bun app;umxlkc)o 4j1r(b*cr +$emf$ 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 use-x ,7bvwvr5,in (ede pd 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;c 1js) sas j7yb;p9qc:6ohh uce 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 prim6cam1 t*cvi 63(yv mkzary coil 6 cy1v(*6v3ctmimak zthen 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 tht57 e;rxu 5dace secondary coil then it is;r5u5e7acdx t 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 poer3 nin.ukcc 4bsou:9i,( t n9wer 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 circuy pft*ftb0l/wh -hyw(6- tds:it,

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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 i qc;: tg2by0q3peym 4)g /;t qtpg*omzs:fk-ydeal battery of constant terminal voltage. At the moment contact is made with the batteryy;*moggs4)tq23bk-t; myc:/z 0p:qtf g yq ep, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an i j**75l4zdai1xboyp zdeal battery of constant terminal voltage. At the moment contact is made with the battery7 oa5idbzp1yjx4l*z*, 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 res1wc +yekgnm;*r 0xe:zistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected tojzc.l6cm 2e+k3ti// t i0zud qjz13r x 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*gh lc49xwv:go ul9 htw9(a) v a battery. The time constant for the circuit represenw9hv9o9 ) g:v (4ah xgt*lcluwts the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batterndjqr-v-n0vq:4e ze * u2zz,hy. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to n v z zuvj-e*rdz:04,n-qhq2edecrease 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 unubbn 3ww 8t;ti7 e2;z.wi,mnvits 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 connect*zmm.qtr t;zaz 7+v2pxluq+ocx2 n 25 ed to an AC power supply. On this 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 connecte:u;bi+;9,k-zgfi4 gp olx6y v x.m meyd to an AC power supply. In this circuit, the current+e;zog, b um mviy l-xpk.x9yg;f4i:6

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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 chal 5hr/td-q pb+/ngwg4y6.tf ,s+agzcnd9 :umnges by what factor when the frequency is qgb//c 4 9 df rsh.+n :mut5-g6+lna,dwpytgz tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor2(ribc1bx2w, ws 7t 5m0xuzsm is doubled, the inductive reactance of that inductor1cixmw z(2u 5xss7r b bm2wt,0

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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 voltagrc6e1j0ey/u we across an inductor approaches zero, the inductive reactan0u/e1rw e 6cyjce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, a05gj 0upwhx fk9y5qk,y(g6 * fyw/xx the current (kfwx 5j0u0y q/ f p*kyx95w6ga,xhyg

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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 cikp9y7i:5 + ;iu-tbj/v 5tldv0edak kdrcuit changes by what factor when the frequency isvk t5 l 97/bu;iddkyt5p jdvk0a+e: i- 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 zerotuju f2. m5tr+, the capacitive reacfju+t5.u mr 2ttance 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 o8 fmki2ep e1u/a*8g fsf the inductor and capacitor in a RLCmg2ae ep8s f8k*1uif/ series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLsyn-tbu.2 ,kc)sr g9d C circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedqo2 2u s4xt1dojj6sfbud6(*c ance of the circuit increases if R increases. When issuu dc fx(12j6qb42 ojost6 *d this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. T26fw/9sono /u zoc3n ghe 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 circuwx 3,h 71bajpqit 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 bothxn0vwhs4c*c: zf6n 6m double in an LRC series circuit, the resonant fx n0cm*s:fz4w6vnch6 requency of 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 appliedsl :c f813nzvn 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 circuic+r50j kises2 t 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 urrm gc;f9 t08iniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of c0 fmr89r;g itthe 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 unif2m is0j 0etv,lorm magnetic field of 0.20 T. Find the magnetic flux through the loop 2jst 00eivlm, 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 uniform magnec4a, 9 rgts(ek(l( kqytic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and(qr st9(eg ,l(ckka4 y 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 loom.q )hve2v-lm e kxg,fn(wq:2p is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coig1k*.x gudbp2 l changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with hc g bcg0((cz(ti4*va 200 turns of wire on a square frame with sides 18 cm. A uhz4agitv(*c0( g cbc( niform 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 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 a8;mly8ilt 1i . wqylk:n 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 arei3ra5a-f -yp za $0.20 \; m^{2}$ 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 horizontal) 0dj ax 4y4xuch0+sreg 0+caqly at a location where the downward component of the Earth's ma40ae4jyxc0 rqshdg aux++ c0)gnetic 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 cons(nh*yg,q *i2rls 4.qy. usrmftant angular velocity of 2.0 rad/s ab(qshnmr ** q .lyursy.,i4gf2out a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loya)q eue6f ank ;qw9h/gon d4/5x/jf: ops 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 tr4.,reh y g ws5). vsmet,- e,bqu 9bjh4gsfg*urns 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 loop 4p1 4cb t-dlmnis 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, tmd1 pbcn4l4 -what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wir: +(qpndpy3/hqp:h ss(cnow 1e 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 gen xt-h4 j/mo.db(6sr,u x;sci derator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area ,dbxmditu6x4c.s h s-/ rj;(oof 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 maximum x)9oqua /a8tsokwq b,sk8,4c (vpd304kapyk$emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ovsr;a psh qjr9+a62jzb:g3x ,perates 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 resistance of 6.00 W. The motor operates on 1 /(xzhsfomq3hd54p-vu) 5 vrk1 d wfr)20 V AC, and when u p5 ro-/w3kdzdh 4xrm1vf))fqh( v 5srunning 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 connectedyg/kdao; n/4r8, vqgn to a 24-V power supply. The operating current is 1.0 A. 4gqo k;r n//gndy8v,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 interna jqq4o24eetjfq2fxlo r c,1+g k.(4 kdl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bxo1.tfqg424cqr4klq2o d( jk,fe +je ack $emf$ 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 tofukknc+u8ju,mr 3 kj0p.aq;khh9;+ k a 24-V power supply. The operating currk+3cu+njr ;k. 9,kfhhk; 8ukapm q0 juent 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 primq-9wzq5g x x h7ibq:j(ary 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 14vlf -a(7e+e w m,k3twl A to flow in the secondary. How many turns are in the secondafwk7l le,t +e(vm3 -wary?

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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 xw(26)ec lian are necessary in a 110-V primary if the 24-V secondary has i cw)l2(e6x an100 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-tur8mi3bqybz) *mt pdc*dw ,1pt x53vz /en primary coil and a 2000-turn secondary coil. If the cui3,tqbewmv x8/d *)y p5zb cm3*tdz1prrent 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 primary of a transformer. Assuming 100% ef u g-vilht8i,mx 4qeg)q,356o b yht0eficiency, how many amps at 24 V can flow in)lbm e3v05,e8y6iq- xqhtgog4u, tih the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign tras0tiyhw-m.p) ms0g4b nsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. mpsw s g)b0i-4yh.0mt 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 primary coif2euax v 5s+5.avoc 6ol and 300 turns on its secondary coil. If 1 o uavaxf.+eo5s25c6v20 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on i gyz ., 0i0p pejlh 7u.jcx8g1yq5j8yzts secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in tj7yqejj.p yi yg1pxg885,.zc 0u l 0hzhe 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 hass-l bruh+ 6i3wa(ys0 z 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondai3 w l-zhu+y0sbr(6 sary 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 turns. Ifje8 20yglce bng33do 2 the input voltage to the primary is 100 V, we can expec8leo2n 2dg 3ce bjy0g3t 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 tu7 cvd0c5 fhcfnz4j)8rj: ju4crns and its secondary has 200 turns. If the power input to the primary is 100 W,fu)h45fn48: dzccv7 jccj0jr 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. Thevox:q, c f,,8ap h 0warg,6jik 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 number of turns in the secondary if the0,p woaqvi x, ,kh8jra6,: gcf 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 Abrtfk *jy76 e1 ctk5w pwbz1sq h(f.-b/z*3ne 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 resi .bc* twyj1hwfteqn* zkkf 13 -7b6pbsr/5(ezstance 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 r:)1hn x;lmkj pma( 9k-u(nn iof current at 120 V. The voltage is usually stepped up tkmjxm ) pna:-r(ikl (n 1h;9uno 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 hpk 8)nxhau :u9e/mohot,ts0 4as 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 i,o:) e9ou4k0h sttn /8 uhaxpms stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistancefh.g n54ndlqd+/ia1kf u(er5mp+ jb6 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. Wh hkfd.4 (q/j5f5+gbm+r u1a ndle6n piat percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be l b0wrhtd+1km+igj - d(ost if the power were transmittgwj-dit +0r 1mk(h+b ded 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 440 V at 20 Abn so1(oh.z.v);syl9e) glwb. It is to be transmitted on a line with resistance of 0.60 W. To what volta)z.(vo l s1)eb b9ohw.sny;glge must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in th7: /2x)el2t.pqy xvzql qzkt)e coil's magnetic fiq pyx7eq)2 k.tx/2zzlq: tl)veld?

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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 i1pp5zjz 5g ;6oqueri(zaa, /resistor and an 18-H inductor. What is this circuaeai, 56; q 5rpop1z(/gzjzi uit'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 voltage in an AC circuit where the rms vkt+gf1 11 d9rop csx: d 3 -tefhb,k0lc3t)wtaoltage 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 fnilo/ym4y)zcp 9, t-into a 120-V AC 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 re, fgwz jn4d./ysistance of the lampd z4.g fwyj,/n?

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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 tp*1l(hisz ;qwss3ehp6e i* hl3+a f c/he peak current through s33qw**( 6fhz ea1eip p ;lhsil hs+c/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. What is the powg vp4gp z+m.(aer dissipated zg g pv(mp4+.ain 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 resistor is 8liv,ixu aq32$I = 0.80 \sin (240 t)$. 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 i* .yj s;ezkwbkf7eb/6 s $I = 0.80 \sin (240 t)$. 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 resisto/y9ta. zunw4gr 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 at 60p v(7ppuv:f/r 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 omh e2np zg wh t3pfl+(9 n)5y83fo3godv)2kgff a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0xjbd 8og27 i 6pcl4u4d W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at p6 (49/ohcbhw2rv inf 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 aoaiz.-i)8hekz2i (n gw;lp+ m frequency of 20 kHz is appliz-8n)ml gwi 2 hipeiaoz;+.k( ed 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 4w uaiv j.w4f1 5ffv1f110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF cadojnl/x 52goj+y 1 4kzsw;2lapacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive rea+a okhsq/ d+duag3 b7;ctance 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 capacitor have a reactan ktmb6i,qas h7gkx/b 9l,a 4mt4):lwj ce 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 capcu*(r5af 4dyn; nt9 )c11hfvxr/dfuuacitor be 100 Wr 9 x1) *cc(u u5yf;au1rhff/dvntdn4?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hzzbw 92:ay cga)xfc. 6o 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 r- hxd7 m;o6z5-x; yzcvo a/xowith 12.0 W resistance, 15.0 W inductive reactance, -vamz;oyo- d6ohxzr;5 7/c xxand 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,j/an s9 .qpg*w5k8 spl 20-mH coil, and 1.0-mF cwq9.n5j kalg8s/ pp*sapacitor 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 8zt :b /:m:f/4bomty jdhgnt2at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor t g b/fbtmnm j :t2z8:o4h/d:yare 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 connected in series with a ap67 cxti3o.0s 3ih tq20-mH inductor, what is the impeda30p6hs.q aii7 tcxo3 tnce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whatmc/dx5grglv 7w032du is the phase u vr7g l3dcwdm0g/x25 angle 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 circui s)aj ab5ykfp*90,gu it with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W a agyu50sb*pji)k9a ,ft 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 capacitan7oy/w g6vkd y8w/9yu xces is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzw 8yvduyoky9x/6/w7g ?

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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 45-,lv bd3h5(h8lwjho ba g4 pv vc*bg++0-mH inductor at 5000 Hz for a total impeda8g*b+hog54v, 3p-wjlv+b vh alc bhd (nce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put inqon(0 xaw rzc(-1h b:8fg5ifx series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 o wfnx1fg8brzx-:iq(5 h0(ackW?

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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 connkk tr;;qo6bsfcj *xug ( *+mi9ected in series with a 20-mF capacitor. What is the impedance at 1(s f9jg *ko bcu6;qtik x*+;mr000 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 ne2c(*v8 g6wfd4o9wn h(p9 xhjv 5p kgkmeded in series with a 10-mF capacitor at 1.0 kHz for a total impedance2 (v9x4n8 *fpgo(vwjhpd6kckg9w hm5 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 :3 mcms /uoo9zwrd-rjtr5 2 ( q9fj)rc 8pkwj/in series with a 10-mF capacitor at 1.0 kHz for a phase angle w )r (ur/jo-3mpkjc8r sz9r w:mt92j/ o fdcq5of $40^{\circ}$?

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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 series4 tne 9ba32;i3khbwxau-p2es with a 30-W resistor at 1.0 kHz for a total imp2wpea-93 ;bn3u kx4aset2b hiedance 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 withz.e9ygdcqiqzw v 92 k*4y:2 qj a 100-mF capacitor at 120 Hz. What is the phase angleg q 42.iw2kyezd9z*: cqyjv9q ?

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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 15otb7snhjexk,3i- ,s9 fce0- m00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ine93xi-,tscs ,moknj - f0eb7h 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 h66o:ssakyqy** ht k., a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currqh ysa 6s*k.h *k6oty:ent 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 capacitii97, wmhd7ay *lq0w+awo2k rbve reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sw rwkd07q9*,y alb+aio2wmh 7ource. 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 ar/jn d 58iqnk6 series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H ind i8q5/nn6rj dkuctor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase ang;xy /d8tu*sb vle oyd8xt*vbu; /sf $40^{\circ}$ 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,x xllg -wrezr9i9r:7 3 C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourcwixzl3rx-g9r7 l:re 9 e?

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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 circu)ggu o1g8 /fm ssas3x;,s.fwrit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connectes)ss/;om1g.g ,f38ug wxsf rad 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 arsabiw/29s9 um. fah /n 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 resistanxqaf3 a6 lu(0nce of 30 W. What is the polx0u6 (fnaq a3wer 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 s/xlds59 r 6i.f9lahg for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whenf9dr s/is.h5l69lxg a 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-k 3bf,rx:vlg:nm3ruyuuc z2v9,f l:0mF capacitor and a 15-mH coil in series?: ckyu z:xr3l9vg, ,v:m 3lffu2ub0n r

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonx 7 u3hni1k tt0aypb6v*h3 +rr,aa/faant frequh ahpf6 ib/a 0ratktvn+ 37yrua3x,* 1ency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nehfaw x br :/lt0y.z,t)eded in series with a 3.7-mH inductor for a resonant frequentft 0/.:l wa)rhbyxz,cy 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 with4rg+t2b1 u dkh a 30-W resistor and a 40-mH coil if the resonant frequency of theru d1tkb24h g+ circuit is to be 1000 Hz?

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