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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 magneticuat-adwd;-l:h uel5;a d 4 aul+i8.eu 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 that thev0 13jjc e,6wxhn/fof8art7wa* 6l vm $emf$ 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 x2,rgjm3,,ajk tg3ziof loops of wire in a coil produces what kind of change on the inducext,,k3g zjga, mi23jrd $emf$, 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 magnetic2bvc e)s) tun: bdnxk97zi,-i field through a loop of wire produces what kind of change on the inuv ed-ib2n i 9bxc) ),7zsk:tnduced $emf$, 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 ro34*p en1zhsu+b,vz a loop of wire produces what kind of change on the induce4on*1vz3 u,rsb+zeph d $emf$, 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 ffi nn2uib 2/,kield 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 conductor w ok1uufa17n +rill be that which tends to produce which of the followi+ku ar17ou1fnng 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 fkf/j71dwg.1rqyf.nqbl *nc)lat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationnqlr 17jf gn/.)*bc1dyw q.fk ary 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 tablebdtmo 1 07e-(: n nkjiq;ei9ov. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (d 7n1beet; :in(v i-jmo0 qo9kwhen 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 whered/8 yv8ne- ,8on)hi+jh0wp /qz aqcyq the magnetic field vector points sey/apq -,j qwv+h8 cnqn zo 8d8)hi/y0traight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level )pp lb8g)+uhm:e: blztable top in a region where the magnetic field vector points straight )bl e 8ul+m): pp:bghzup. 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 horizontal table top in a 5,- xm+tnvh, xm9q3,cdaylm qregion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in, d +xy5-mqm,l9,m 3tc hnaqxv 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 ow)2:jy bioj+ 5hkyyj 7n 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 j5yk ow+jj:h )by iy27wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first ) dw.oiws a5+mehg0s3. As the north pole ente ms+i )03 oasge.hd5wwrs 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 at constant angular speed about an axi :gio9o,kxr; m :n -upoo-y4jgl*q+ cns whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the*p-y9: ,orxi n-+ ougg om4nlkc;:qoj 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 r.ouvu-ph 6j ddruy: /mvz,93votated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop ypzd,ur vjm h/ 6vuv9:-uo3d.'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.xna:o.e,sc 8 aqnj+2v
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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 an9x7bhyr v0g7 f $emf$ 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 fg :xev zzr*; t69/qvzgield. The $emf$ 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 5g:-d+j 2u, 1 wffpg lbgxor7rnorthward at constant velocity through a magnetic field thatj7r wob5 -2: 1dgufgpfgr+ lx, 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 fk1 0 unmj milu;v(,4frotates 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 tran 06o e n l9el,q/g3npwp ows fk0ui97cw57e)wgsforms

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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. T7o x-p+ vpxny(he frequency of the oxpy( 7xp+v- n$emf$ 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/(lf5om /5cp lnqh s0rd 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 device tha bcqm2 v2/+ bwnfoi)z)t

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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 primary coiaqr 4+s1 g0rijuh vrfab62sqt1;r82ol thabsusj 0aiq1 qorv+4hr 6r;t12 2rfg8en it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary tt o,;4f je;:nq,d zfdcoil then it is ;djn :,f4dq f zett;o,a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the po(m st ht*mt:w9wer 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 cissw ez48x2ti 3rcuit,

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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 idealyg .j w nb2,vwxksl+g: 7/g1sv8,e9qgrlo5lo battery of constant terminal volta/n:rqlb2og+ s e1xv.g 9w g,o7y,sl58 wl kvjgge. 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 indusg+/jc 0 bpw8 5 fokue1qe2v2kctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducto bug8fk+25j01kwcvep2/oq es r 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 3i (h0x:vnxobinductance 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 wfui+h7pcrjw1mf9 )o (y p2b 3kith inductance 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 connpsozx. pz 7b1uy0br,: ected in series to a battery. The time constant for the circuit represents the time requi.s10rxpb,upb : yzzo 7red 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 bao89i.h( .gsqp*yvr ;7ew ax ojttery. The battery is suddenly removed from the circuit. The time constant fyhi8 oq. a;s97r g jex*pwv.o(or of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following5. koak2oqn w; have the same 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 connect z p6oo1p/c-vh,6xg-ywzzn m72ro e n0ed 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 connected to an AC powes :xqwv q53epct;qadp43:gp5r supply. In this circuit, the currentcwq:;vqqp 3x p4 3estpd:5ag5

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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 a9/t-;)uufet v) w7 r9xw6gwo zd -mnzxc circuit changes by what factor when the frequency is tripx )z ouwrzn9d/uf 6tv-x)gtw7w;m e9-led?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is double/ny ude.u6/lvd, the inductive reactance ofu vn/e6/l.yu d 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, tht dux z)2m **2b--k-gaweofs pe inductive reactance of thtm w*-kx a)pf sg2o e--2d*zubat 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, the cp8 ) u+gu vdzzyc79z 33fbcev)urren9zd8 cz7 3fgvzvy)ep3ub +cu) 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 circuit changes by what factor when b1e(e/ jtlaqgrk(, 7s the frequency is triplg s(e1/eqk tabr,7(jled?

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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 ap )1+j.o v92d tqosbpnnproaches zero, the capacitive reactance of that ctd2 ooqb1jn n9svp ).+apacitor

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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 ofe0ur(ygx9:4( w 5b b;fpvisdh the inductor and capacitor in a R wv9sb :4buphxdyi; f(0rge(5LC 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 RLC circuit is defined ho2hr j*.gnvle738v)5qe ehz 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. Thx/ u5x,kexcy:f q6*lze impedance of the circuit increases if R increases. When is thie lf:/u6 5,*xyx qzkcxs 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. The impedance of the circuit increases iduso8s -i8b/ qs u ;;4:aort:)ndxr wzov: )wif $X_L$ 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 o(d 9,algkbk*v7.ydf f dwg - i+f2nqj)f 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 ciep+; 62a9rei dudwh9 zm;3mq krcuit, the resonant frequenc9pdw6hue e 2+mkr 9ai; 3;zqdmy 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 applied voltvrg bv:jek0 4w3yq,+rage. 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 circuitzd-g4b)tkth 1 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 ilr 5;gx,,glb dn a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and ,5rb,x gdlgl;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 of 0 tqw 1-vd3.eu+tl 9)s;exz uho.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are ptsl3eo eu.uvh ;) 9q1 w-txdz+erpendicular.

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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 0.10e1 cwdrp k q2d .x;qw2y-9wch/ m is rotating in a uniform magnetic field of 0.20 T. Find the mq-qh1dx 2rde w /.9ck2yw;wcp 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 534i18t0d um izy1b zbbhwv )rrx;ib8adjustable single loop 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 coil g6+yci*u rm-i-mpc ,dchanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. A 5d- g,d 2f9jnizu3bcqunz 9c3-bfqn2d 5jd ,uigiform 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 wi 8s,kgo/ssis8m5 dow(bog7 3 uqug: n0th 15 turns and an 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 area ;sd9 f3ssiw( i$0.20 \; m^{2}$ 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 locationvjft om-eqto3+0wh*0fxsd 3 , where the downward component of the Ear , -*e vxtoots+wj3dmq0f0 h3fth'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 cocmy8gi5euz n,+,8uco ip2 0zbnstant angular velocity of 2.0 rad/s about a vertical axis throu58 cub yc2gzzouep,nm+,0 8iigh 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 e p ec)eechu0rq8dkg5p47)k 1pi/5avloops 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 turns oft+ (iho;- mm5z1n y7xouauf8z 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 j7tz5zs4da -u loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis pz7-ztdu5s4aj arallel 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 of wire of area n 7mm7;p6qeuvr+ szu8w. m zkl89ddp9$0.090 \; m^{2}$ 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 gq8g ojuul) .ixet2eoq :t y,0,enerator with an output of 12 V maximum when rote 8ye:x0q,jui ,)touqo g2.t lated at 60 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 generator with a maximu47qm kug;qa5v a gi0i.m $emf$ 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 hav(8/5xa-k sbux/mb0meh lfs : ie a resistance 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 aeizq .v m*ld.,w cqk5/ resistance of 6.00 W. The motor operates on 120 V AC, and when r ie z.dqm/ ,vcwkql.*5unning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. T/1ln. gfzj qpmx6 99wmhe operating current is 1.0 A. What is the start-upmf1zlq6gw n9j xp ./9m 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 supply. 5c;d;f dopgy(5zca k:r+ (gi8zh d,vf The operrpzfhfvddadk8+5((; : ; gicoy,zc5gating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a vgm;;8j ev15 tlw1ue2o lu3lv 24-V power supply. The operating currlvtuv3gme82jlo w;e 11v5 ;ulent 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 g6dmhw+b8 r/(hpha:s is needed 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 joxw0 kk7t8nyb 91.3z dvcg(q81t kfo of a transformer causes 14 A to flow in the secondary. How many turns are in the1 vot1kft3c7.g (89 8b qjkndoxky 0zw 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 m9kfeb6/b,rxug ez6 ,dany turns are necessary in a 110-V primary if the 24-V se/6be r6,bfud x ge,zk9condary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn p ak x,l5p5 bo5u4sdj*urimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the c*l p k55a5x4u,bdusjourrent 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 trak /shy(3 nt2rtab/ tv0nsformer. Assuming 100% efficiency, how many amps at 24 V can fv(sahktb y/ r t2t3/n0low 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 prov /6m p.l3r;;,n ; jpkx0mdys.xfumyxbides 7500 V at 10.0 mA. The primary coil mp0b; yjx; ud..xr3;sm 6pf/m yl,kxnoperates 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 it6hs1 r.; eiw(kyuw1ics primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltag1u1iri6ww(; s h e.ykce 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 iu,rjjv7-pq3tc*f v 4kts secondary coil. If 120 V at 2.0 j7vputv4, 3*crfq -kj A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 ihjdwit :l 2,*turns. If the input current at the primary is 100 A, we can expect the output current ati2:l j*,wt hdi 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 tja-wd: 0dg9qhas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sedg j9 :wat0d-qcondary 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 b8h terxn24fyfk2agmo gjd837 k(9, 9:ew r qlhas 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional lossese,q3 w f24gd(o 9erhktk j bx yml7fgn8r:a298)

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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 curres9xmo 2gs*4apm*n j*1vryey i5h )4n jnt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secona4ro*p xnjmhs*i ygj*y n)ms194ve 2 5dary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usu +ydtotvlnm u +8rb: i:npt1*9ally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the trans 9+ m*+b:ritdy 1pn8nvut:lotmission 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 voltalid q5)0l ic:mdan+)jge is usually stepped up to 4500 V by a transformer a)dia dclnq:m5lj+0)i nd transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W.5 -1wl eggdk9f A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of wldg9-kg5 1efthe 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 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 resistance oe)naoox*w s+at5y;c kjy4s5:f 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the ;:jo n4*5cs+ ytkyxa5a so)ewtransformer 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 b 5z+kejk10c.c0jnu td e lost if the power were transmitt. 0cdt z0u5e+ jknjk1ced 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 A. It is to be transmitted on a linhpngj4spu kj; .pycu (3+6l/ke with resistance of 0.60 W. To what voltageppj(g.u l4hs/6n+pycu ; kj3k 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 stooit/qy6918cyk e 0w)kzv kb4gred in the coil's magnetic field?b1 kityy49c kveq6/wo)k 80 zg

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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 18-H inductor. What v2upwtf81 aariyf,l5cm 33d) is this 35l)viuyw, afd 32t f8 pc1amrcircuit'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 thl2bfi p*3d6cye rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak p) 4 7icp trf16g0*vpa)j qqdscurrent?

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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 the v6eg*ds 5outz6yz5i5la6yz6zud55v 5t*o s geimp?

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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 tclba0 y7w-ycj4 w)kw9he peak current through the resistor?4ab-7w 9cwc)ykl0y w j

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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 supplyvx: n0sj148tqqz u 9qw0ry/h d. What is the power dissipated in the rrjsw qx4qyq8vznuh d 0:09 1/tesistor?

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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 31tr c:-h 7grnpsw-er50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisvy 6 qbk u200x4.p4gw8bmtkgjtor 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 ojq :7zvp . rs4lko)1d+ xut:oa 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 induiec)cr*mwpn seuc(046h4 8mu ctor 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 ale3/ ysgq06/ef (q sj 4/e4ollpfah 8y 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 h.r0uqqrs1 + lr g7lo+cave 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 *u7*lc iwvc:k157 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 whe778a-zrxvro en 120 V AC at a frequency of 20 kHz is applize-rra7v7 o8xed 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 2.5i g/0iouiq.d .kj7kgc-2b4ye0-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF c96 t ;fb0 yp,+wjy 85brw9kh qi+saxtkapacitor 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 h:uy l/ko6yd yy n04a+jave 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacbp9b9mwbrzy/n r x2f* 6jch je8-m7s: itor 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 reactanc.(narvkanw 5j 8z dx;:xkj* t;e of a 0.010-mF capacitor be 100 W?xkk an8v wdrt5z:;jj ;(a*x .n

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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 capxx z0+brb:7 nsacitor 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 circurm0c8dc e g761jdvn*oit with 12.0 W resistance, 15.0 W inductive reactance, and 100cmddg71r ove*c86 jn .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* tdoc u)*xk720-mH coil, and 1.0-mF capacitor are connected in se k) cj7*dtxo*uries?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-m9gmw4; xqz1yzrd ( : 1+c6tr8fqeb thmH coil, and 1.0-mF capacitor are connected in seri ;rq4m:8h+ (dcyte1 gtb19mzr xqz6fwes?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what i.x r256alp oqgs -q5 erv/hy7ts the i 72ovgrray ptx5s q5l.h/6-qempedance 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 se2rdlt 3ctfav4 m) jn x5l/ne,(ries with a 20-mH inductor, what is the phase angle lcf4 t(m,5rdln2t3jeav)xn/ at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and mssy,ysu 3* 2r1.0-mF capacitouy s32*rms s,yr for a total 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 is needed in series with a 100y0es5md;2alvr f p6*-a aycf5-W resistor and 15-mH coil to get a total impedance of5flr c0aay;y f 5s6 emav-pd*2 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor aql2.s(hhyl- kt 5000 Hz for a total i. l2 lhkyh-s(qmpedance 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 be8k hxa4;/ 4wiuk+ky m)g5hn cd put in series with a 100-kW resistor at 1.0-MHz for a total impedance of kh + d m4ikah/ u)x845cyn;gkw150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What iserh7;t vt58ha the impedance at 1000 h5aht8 v 7te;rHz?

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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 1h/h(dla gzt* 4.0 kHz for a total impe t4h(h* lgdaz/dance 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 capjk/d e9d y**2m3rwgbeacitor at 1.0 kHz for a phase angle y ebged*mkd*2rw39j/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 p 5jgk.h9x 0dj1.0 kHz for a total impedance9hx5g 0jdpkj. 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 1 0gx4bz5v g waxi;2s:j20 Hz. What is the phasg:zgi4v ;50xa w xsj2be 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 /c1m8 h6;d vspla 3z:czvl+st a 100-W resistor, 20-mH coil, and 1.0-mF capacitor a6vc;pl 3zt/ss:dzlh8+av c 1 mre 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 circuitj)q01 o or+ujd consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The d ojuj+)qr01 ocircuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30.soixqam4u0pg(d-b;s ,;z2rl * tbnb W, and an inductor of inductive reactance 30 W are crntug,;qx *s obp a b;l0b-2d.4si m(zonnected 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 f -)pj-mw)d/, nbp jocso .ft,gwio2(aor a series RLC circuit containing a 50-W resistor, a 10-mF bfj--p)tj dnp,oos w /o.,(2mci wag)capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nmc6.gthjj 7d ;ecessary in series with a 500-W resistor for a phase angle ofjdg ; h7mj6ct. $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what freao vyhd- ,/sh3quency should the circuit be driven in order to have maximum p,y-sah /ohd 3vower 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 ah 51u 7.wobiphc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the 1hi7wo.bu5hpcircuit 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 isu to h(m-m/uy- $63^{\circ}$. 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 60bi 80k 1yrn2sq W and a resistance of 30 W. What is the power factornb18 i0rq2yks ?

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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 seris0rxg3g;4c/ ud b r6ames RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, ucs63d0xb mggr4ar/ ;when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF cd 3squ79 oun.tapacitor and a 15-mH coil in series?7 quu.d 9nots3

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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 foyy61pwav(mk x + 8b3iga 06 iz*oiimd6r a resonant frequediy6i+0y gka*1izv6p(b 3i8mwx m a 6oncy 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 ser8qh8mq+2 bhqep -9uyiies with a 3.7-mH inductor for a resonant frequency of 1000p uqmy ibh9-+qe 88h2q 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 se*jw:judq,r;8nh5q9aasmu i.9 / em ba ries with a 30-W resistor and a 40-mH coil if thej9 ; ui9,mjdq:/mwr.u shnqaa *e8b5a resonant frequency of the circuit is to be 1000 Hz?

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