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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 oo yq*x .fza.uil(j,o3 f 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 th ufn(b+psv.9 jp,c*cr 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 loopxqop ig+ .j jlj0,dfsp: hbeqw7 ;)12vs of wire in a coil produces what kind of change on the induced l.h)wjq+ v pi,;jg17:boqs2pe j0 dxf $emf$, 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 ottcz, 2t6ibwnrx4tjt ci7v9smjp r t 0117- n3f the magnetic field through a loop of wire produces what kind o crcntx t1t27iw6vt 7sj-bmt 1r39n pz4tji0,f 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 ld0jmcb+ 5jl/ produces what kind of change on the indu+j0/ld5bc j lmced $emf$, 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 0 f,ybxy)a f7ufrom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the directio2 y4q4 (muuxngn of an induced current in a conductor will be that whichg um(2u 4qxy4n 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 flat ucza6i 5ilyn.h/w(m4 on a horizontal table. A bar magnet is held above its center wiui5ah/ c6(yizmnw l4.th 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 fp :1e-b rcuoo(lat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling -oo rbc(1pu:emagnet 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 qha. q1jw(.7a qy *nhuregion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in tyjqnqa(..w hq 71ha*u his coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnexxr/ zfp0we7n::7db q* d-duxtic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field incdnp-:0 rzb7/e7wux:xf*ddqx reases?

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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 : *1xza-i3x/rk ysz s6wwf f48cu ti(nin a region where the magnetic field points straight down. The magneti fxsy/-u 4t1c3iinzxw akfzs(6* r:8wc field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an15dz cax52sowj)-npf ever-increasing current northward. Twa)pd -15fox5wzs2 c jno coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north+ eoi+9en8q.d ha4rp j pole entering first. As the north polej+8e+q nh4r9pae.d io enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated atx se2m:l w.;qv constant angular speed about an axis whose direction can be varied. In a region where ax sel;mq2.v w: 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 speed about an axis whosu (ozg -kyi0 8xbpi0b/d(2 jmye direction can be varied. In a region where a uniform magnetic field points straight down, what must be the ox0kb y/(m8i-2 (y0uijdzopbg rientation 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.0ojaaimf ievz -5q:/ 4
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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 thayu bi13yj n74igd6t k(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. The 8 (w-28wvssy.g7 wehwpa4 , pyj gfce)$emf$ 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 eal 90m-f5obpd4+ro, ix by/pjyst-west direction) is moved northward at constant velocity throughlb5p4ob f/ -y pi+,rxjo0dy9m 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 constant angular vel0.3t ortp0(q*vu j otiocity $\omega$ 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 transfor2z:q7npakb6j ms

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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 secetqo,-gnq ) v.kr hx*.ond. The frequency of t,*k tqo.-vhx) nrgqe. 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/sj h/d:hj6aa 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 d/oy 1.7 yn3ei7trrbcgevice 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 secon542vdz ws,hmg dary coil contains more loops than the primary coil then itsm4hw,dvz5 g2 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 ufcyy2px : z+ i/u.la+the primary coil contains more loops than the secondary coil then it is +yz .+u:a2clf p/uiyxa

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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 pow lmf6krg1fiyx*o,v0h 14 ;c e-upw k8ser 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 cirdnblmtm13i:se 3 :i+n cuit,

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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 of cokzgaasb09 /sz:o,muih6 lms;*tlh .8nstant terminal voltage. At the moment contact is made with the battery, the voltage achh0l8/*; tma :u ,azzok9.sg slbms6iross 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 idealdwc7)( jjue1 z battery of constant terminal voltage 1)(d wjue7zcj. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance Rg2is:ktm;)hb9 dwj ,wn9ed 9 s 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 to :j ilfvkj:**;-. t4epm8e *hrb mfrt ean $emf$. 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. *x( pjpnixm2;c (g5aj. vkh1eThe time constant jc1;vx(m x*hn(. 5kejappig 2for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inddoxr.8bp .8i6jy b ft vy .9lr9i5q7aauctor are connected 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 the current to decrefit iq6 9x bpl..8v7jor5ry .b8ay9daase 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 lt8p/q ry+ 3je ep998w0mevwqsame units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an 0xw med: px62 4fsw+ax+j) rvxAC 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 connected nj+ o)6.+, qjktwj cedto an AC power supply. In this circuit, the currentq+tkj oewj 6)c,jd.+n

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when t,eq j(h.t,p bdhe frequency is tripled ,b.,t(qhje dp?

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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 dou* v; 7ydapcj+3/i6/laaqgirgbled, the inductive reactanpd g6ia*+/ icry7l3; jaa/qvgce 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:m. afui, :lur6w7pwx AC voltage across an inductor approaches zero, the inductive reactaa.: m w6w:xrpi7u,fulnce 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 an3p qgu qw. trd2g.zn54 AC power supply. In this circuit, the curren u.t2g45pgdnqwzq r3.t

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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 circu6,1qt g (7l8s.n2 vtyeetjikqit changes by what factor when the frequen ej72t68ne1g yq. tsqt,ilk(v cy 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 p6bktaevv3ip3w z 50/u zt(5lAC voltage across a capacitor approaches zero, the capacitiv zl506z au/ip33e (b5ptktwv ve 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 ane54dxk(ssqz8z v )y/agle between the voltages of the inductor and capacitor in a RLC series cx8 kvezz( ys4) 5dsq/aircuit?

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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 vz*t6t8fdlx l/8 g0ft 1 eyvy8an RLC 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 im gosbj)rgvle 4tp+i l;px49- 9pedance of the circuit increases if R increases. When is this statement tr- pjpelggbrvs94i9tox;l+ 4) ue?

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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/ onegcrq1e )wh6 2u68gl3ocz 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 seriesfo4jaw:b(k9 3l)l hxh circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circu, : mfx, +mmywq*7xvriit, the resonant frequency of that circuit mm*xi :7rxwqmy +,fv,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 ayz0k nz;m +d6fpplied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit o+y-aiygwmia*t /(cg p3do(dov)x68 t ccurs 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 roto j)j* ;y7txneating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnet*n;o7t)jxyje ic 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 unih:f5 e+wlbk+11h y1qd6ov4r j.xf cgg form magnetic field of 0.20 T. Find the magnetic flux through the loop when the plalj ++byd6 ck:4wg.h5efgf1r vhqox 11ne 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 magneticxe2 +m gjbamaec*wp.y-o ;6k( field of 0.20 T. Find the mb p+ jo;xyc- g6aa*m.2kwm ee(agnetic 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 reduu ok3vek va)v) qk.pbt(s),.uwc2d v8 ced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fromx5ipq2jvb:5 5z gj2 pb0 ssqr4 $4.0 \times 10^{-5} \; Wb$ 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 sq9tw yt2c9*iid b*w14h lt0i lbuare frame with sides 18 cm. A uniform magnetic field is appyh1t*2l *b4t0icd bt9wiw9i llied 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 xf h3y5+2caxfan 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 are*j. f mbbi9.jitp9m0t a $0.20 \; m^{2}$ 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 whereznkuwrz 8mmp1ifq5-i //s/2;f. s ugo the downward component oswguskp12uz8;/zoii 5 f/- fm/r mnq. f the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a c ,ez4+:v7fii*c(tbzp pp hi7w+mh;dnonstant angular velocity of 2.0 rad/s about a vertical axis through one of ith;,:*wz pf +7hni cbipdm+4(zt vep7is ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a crvn-j g: :/g. 3wsflc0+eai4xbnm1 imdoss-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 10v)l q ms1ah02m+n -fyb0 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 it9*fthx+sc3i i8f zx, s tg2(hhs armature. Each loop is 12 cm long and 8 cm wide. The +g i*x (fchsz,t8tsfx i92h3harmature 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 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 we1 0f(ig26ez nm0ewh+ /:r 9vwuzmetof 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 a gqf,-t2eslftor13; xn output of 12 V maximum when rotated at 6x,; 2oftst3flg - e1qr0 Hz. A magnetic 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 genec8wy3b ig 8:n5v)w5ej ro) w;z.dlwm erator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Thpvqq+yp1 xc)yt-s+ p,(*2c c7ddaa mz;8qapxe 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 motck-cj,g*a4f aor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed ita*g f-c,aj k4c generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Thg2yx )9yd,cj,vj qtf6e operating current, 2yjyq tfvd6cj)9,xg 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 r*56g*qtqgizd (o;g zt esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full s*( qtq;* zggiz6gto d5peed. 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 6.0sff2::nuyg n: W is connected to a 24-V power supply. The opern :fn:f g2:syuating current 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 nmws)dpndgt sy 60bu*ii 3) .,eeeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seco8wem/xs4 r qhs*0a)n kndary. Hrsm)4sx haen *qw/0 8kow 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 prim3jpu mwt1l o8 aka3ecm-*4qf(ary if the 24-V secondarak8c(mof mt3*-4e3 q p1 juwlay 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 consistgtpv3zwsyor484lgs cr5 d)r03 rn +4ts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currgdlt4oy twrr r np3s+4583vscr)40gzent 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 tranfia6 dm6.zca;:llk)t nt44w nsformer. Assuming 100% efficiency, how mank :6m 4al6nwait4tdlcn);z f. y amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer providrlvv71o)xsf2kwi5 d -es 7500 V at 10.0 mA. The primary coil operates on 120 V. What does tvrf5sk )do-7l12i vwxhe primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turn* ;9e/fxu3ioj p 5emfys on its secondary coil. If 120 V at 2.0 A x 5pm o9 ;fu*y3jif/eeis 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 22dxgdr6 0qfb5/f vpt on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?vt5pd x/qgb fdrf0622

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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 h+pz)u/myffb )ri ;tq6 as 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can exp+y r)m/i ;pftf6q b)uzect 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 transfob51z k lvu8 g93tc2ntbrmer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of8b12t b5 c kvlz9nt3ug the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnsc5ycm yq.ugf 5( ,t/jk. If the c.yk5,utmy5jf(cq g /power input to the primary is 100 W, 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 Voyvl: lv p1gt ,93c/ea. 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 number of turns in the secondary if the primary has 200 turnsl:ot1cv 93 alevp/y,g .

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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. 0ops0jq h1j/vy,n z8 8dbz+zw The voltage is usually stepped uwp ,8y d8bvh10 zzjzos n/jq0+p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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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 currenti4q m grq,c/*sllat12 at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistanceg *2rql,m1s i/qt4al c 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 lm.apb/)jqx y 9lz r9cjs2c 2/kine 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 percent pqac)sx 2br9m9.jy z/cjlk2/age 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 lo)j +me m98:7dtl 8asfws rges(ng 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 s8egs+a7mm f9e jrsl: dt w)8(a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted vb-o cy9; 7je sx6lqx2down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 e x96 -voyqsj;l bc27xV?

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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 A. It is to be tran6b0 ggno xrj*8smitted on a line with resistance of 0.60 W. 6n8 *gbjgxr0o 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 currenqme znc1p(52pmj 2l f-oq :)ywt of 5.0 A. How much energy is stored in the coil's mfnc wm5jm-)p 1qzq(:l o y2pe2agnetic 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 resisr5xsg+y).eux z9 wq0kn r .jc:tor and an 18-H inductor. What is this circuit's time .s) ne0q.y x rczjwk:5u+xg9rconstant?

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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 rm; kh vzb n4:,:b8jg0 n nr8taqg(7kzkys 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 ryl*;kk2.8d hveo)ztx( ;v vi 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 inqcl,4s-w g cps50t0igto a 120-V AC outlet. What is the resistance of the lamp-cl5s4p g0gq,w0s c it?

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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 the peak curreavvltan31ok(b 52 f v60j)gjwnt throu3 6k(5)v2vfb0t oa1j a ljgwvngh 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 powerh, ltb. qufdt z35vf-t;/(mbv supply. What is the power dissipated iv,b f-tdt.5lu (mv fb /q;zht3n 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+r(e uzfqe8xav* sy4* 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-W7ka7tyn6 cpw5w7rj+pit 4 r,zg+z 8k k resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W residq uc*a1 :1coistor 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-5i;s;su67uix gehn d a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a -krjt gbd*dqjvor. 1(./ d4pn 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 14.0 m5:wep x*d.b7x 1pcaqW 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 157pm frmd8qh bh7f9e (p )k5r:pwg9*n2e W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a freqvocuq 5n71 . puavyq75uency of 20 kHz is applied acvo 75v1qq 75nyp.uu 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 ev3f.mb,:0 fww n)y.bpt;tbpu8x/ uka 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7- a4dr9r*f;qdxcuvf-8 vnqj 8; mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance a+ dtz-uy6ju vbu g -zs4/;fr:bou*8eht 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 h 1 8yr4tdf2auvave 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 capaciti/9um (er yv16y: vndwqve reactance of a 0.010-mF capacitor be 100 W?v qu:yn 1y/vmr(wed96

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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 k4udc) f1p:vr.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 b 4zeq5wy):sfj.hbr,b tqau. u4fz;( an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.05jtrs , eu4yuaf)(:q;h zf4z.w q.bbb 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 0rkbz0 siyf3(0ty jr8 if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ses b80rf03(ziky0yj rt ries?

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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 ang9hybr k)vhe78s;uh6 8zpg e:qle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?9u678k 8vhs rq;hh:e)gpez by

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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 connec 7r mk. +b2tila1kas2xted in series with a 20-mH inductor, what is the impedance a2ktx1b 7a.+l k2siar mt 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 iq 5c o+:nobtl1 g02whvs connected in series with a 20-mH inductor, what is the phase 1o2c5: qtnbh+wl 0og vangle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with c/i jk5 lue xa:3ze 1-qt7jo5sa 20-mH coil and 1.0-mF capacitor for a total impedance of 15s 5k:ejti-lq za7juc/ x3o e100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W 3wze rx48avz)resistor and 15-mH coil to get a total iavz8x3r)zw e 4mpedance 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 iir4k5m, jjx)lt9+ypvk, 4r gsz)b dx;n series with a 450-mH inductor at 5000 Hz for a total impedance 9rkr s44+ygij z,,b p 5x m)kdxlj);vtof 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resist8s(*au;t l ka9dodx8/p e/b naor at 1.0-MHz for a total impsakd( e8tpalo 9 8nda; /*xub/edance 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 connecte5ubz0l.8f0y sv65tu,djmnv rd in series with a 20-mF capacitor. What is the impedance at 1000 H yt6lzmfv8j5vs un0 .d rbu50,z?

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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 fordmbsrd50 /d, q a totalsd5bq ,/ddmr0 impedance 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 1op8+j ykhqc28orq t*/.0 kHz for a phase ang2/ rqy 88chjo*o q+kptle 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 neo1j b*:r93o b9bg gzateded in series with a 30-W resistor at 1.0 kHz for a total imperb:ot1b9bag*3 z jg o9dance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is fzxo74+5xo78gj /pgn mq+ zzq the phase angle?7+n5z q7ozx4zq/pj+m8go g fx

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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 arm qgo4 u..ir9 100-W resistor, 20-mH coil, and 1.0-mF capacitor are con .omqi.r9u4gr nected 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 resdd(cq0y fo4)ywza0 0sistor, a 10.0-mF capacitor, and a 0.350-H inductor. The )0z a0dyfd4y0s( owcqcircuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor7 rx 6d-ije qdl.j4po5 of capacitive reactance 30 W, and an inductor of inductive reactancj 7iqodjeldr6 5. -4xpe 30 W are connected in series to a 110-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 RLC circuit cs;gnvpw sz n)/+).kqvontaining a 50-W resistor, a 10-mF capacitor, anssnwp)q; +z /n ).vgkvd a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in ser4awd ,*j*astmr4eufb+g8y: u ies with a 500-W resistor for a phase angle of u4t* mr b 4+f :agjdea*su,w8y$40^{\circ}$ 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 = grj x3v igxewcy:.(mapi )x l.77-1vo 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power x)v3(xgi 1mv-:l7i ox wrj.7ayg.ce ptransferred 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 s l:.hxbyvf6d9un3wfq -kq , -ueries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when b3uf-.l hndyk fv-w, 6u9qqx: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 ci nv /kgf+jrmmo k +6vx5ga4/p4rcuit 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 ;a-, 1jwahqvdan impedance of 60 W and a resistance of 30 W. What ish,v-djw 1q;aa the 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 containingn,7md-e*m u hr a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pod *n-heu m,7mrwer 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 capacitorpjfk-6+17vuv 9dlg qz and a 15-mH coil in series?vlv+ j76ufkp9 g d1zq-

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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 serip-s p3bhak/il qkyb5 us;1 x2;es with a 4.7-mF capacitor for a resonant frequencl1p-uh5y/;;ssk 3i xbp b2q kay 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 needed in series with a 3.7-mH inductor for a resonantkajmht 4k55gm/)ix)r frequency)km h4 ix)r55tk/mgja 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 ;:iw. x5fg; )law6s3eci.pfsnd +b bmwith a 30-W resistor and a 40-mH coil if the resonant frequency of the cirif3f5xa)+n; 6bd;mlsi e.sw: w cgb. pcuit is to be 1000 Hz?

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