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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 ornhat29a d (6if 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 n gz4 rz( syq:/5a tlzygf(h-.states 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 kind of change v) w..nec3becon the inducede.bcevcw. n)3 $emf$, 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 magnet83q.m 3hxu m-*wjqcwh ic field through a loop of wire produces what kind of change on the indm3 qmh38h. -wjcq* xwuuced $emf$, 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 x 993cy1 as*ruhaa6pmwhat kind of change on the induced raam6sy 919cxh* a3p u$emf$, 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 mdmg1d dcs c vn.:/j95aty0c (jagnetic 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 cu7oth q)bqvi;/rrent in a conductor will be that which tends; /vo7h)iq tbq 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 u(tm8if +:l*) kpqmyn flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet inp8mm(t)ul*yfik +: q nduces (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 ba pyb7y2aszdw/bw (h6, r magnet is held above its center with its north pole pointing down, and released. As it approaches the cw adwhb6p bs(,y7 zy/2oil, 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 iu*(meifb a,4 field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the ine4,if*m ( iabuduced 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 tabi;co 4l/ pm hse/9b/au*3w0yzfmstl :le 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 l 9oi//zs* ebfsy;l4mh wa:/p ucmt03induced 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 tyz3c2wc0h av:i - 0/,gvkm ewkv0c/ ya horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. W/y we/2 cct vm-k0 :c0vvy,g30 hizwkahen 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 liesmys0z4n 6 4pss on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on thep n0ys4zms4 6s 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 ofq* 6c a;wmbpa) wire with the north pole entering first. As the north pole enters *cw pba6qm; )athe 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 4m tc-owf0 m+smo 7l; jmtm;l2axis 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 rotation if the indm2;ljm mc;mlo s 4tmfw+0to-7uced $emf$ 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 rotateav;jfj o2aq5owrphv-m h u/ p2*a25 t3d 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 ;2pr jomwpq/j-25oat2a3f vhahv* 5 u 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. hosee3)qg:3g
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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 bg1+)+mk; zfkc2rwquan $emf$ 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 4x+wtn(2s1 p2lpfzkmqz/r 1 e field. 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 northward a7fx 3sqndy 12)xqdw:gt constant velocity throughgw d31xyd2q 7fnsxq): 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 vel,xc fuhmf57h, h .dcp7ocity $\omega$ 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 generator1*nup+82: k j 5h(bqdxiai6jom j0tjf transforms

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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 re 2c1 md/;udpp.h ewuv3volutions each second. The frequency of theuvh .2mwd p/pd;3u1 ec $emf$ 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 u/dgrn i*y:e0 gsed 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 6k,tz rjv.i de6zed1n+g 1+gv 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, ifh 3m6-bm wfvx, the secondary coil contains more loops than the primary coil the xw6b,v-m h3fmn 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 ng 07unwf.6 jlmore loops than the secondary coil then itgnu0lw 6 .jn7f is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpuu --hm2ew8hg2svc.4ughmf v) t

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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 circuit,srdmelp8 .-za v*8og :

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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 a 4+w/eiga*g o-cpu2-ilv qz)nxw6v2ure connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, theianwxw-2op2cu) qgv46 gzu-e vi /*l+ 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 connd v 7hac+. 16tb9belezected in series to an ideal battery of constant terminal voltage. At the moment cev 7bl6dhbz9 1eat+c .ontact 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 R i st-lie eaw+o -kzxu+96rqd0ma8v. d*s 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 induct x)qf+-* vgijjance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seh08i. d6aub +mly 7bmtries to a battery. The time constant for the circuit repre8 +dl umm 0i.h76yabbtsents 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 battery. n4genp-,r9w,w ihk0nk3 5vfe The battery is suddenlyfn-k9v ge50phn, , ienk4w3 wr removed from the circuit. The time constant for 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 following hiaf 5rletvz1q0u1t z :q):-rr 0gh7yrave 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 connected to an AC power supply. On 6ch0 xuhm v1n48:dtbus)hf9ythis circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this ibpc4xz 2za kz;+qhnhj1j; eja58m- *circuit, the currentca z h;z a mq1hpj8j*jzbkei +4-xn2;5

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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 fat m + dvlv3rq*.*ponq6ctor when the frequency i vtpqqnd*3lr o+m .v6*s 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 inductor is doubled, the inductive 8al(9v -eb8,zuihwb,+ r tdms reactance of thamdbuw, h,t-blea+z s 8ivr(8 9t 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 *wtm 3k,/vulszero, the inductive reactu,l/mvk 3t ws*ance 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 t9xgb0/cr)zyh his circuit, the currec bh)9r 0xyzg/nt

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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 circuiei si7+:2 is(nagdxr( t changes by what factor when the freque s7rda si(2iex (gi:+nncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the cagk+q /f2c0su; r0sef5syun.tpacitive reactance of that cyfnk0t su5u;cg se/.2r0+qfsapacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the i tyw dnb:*7 g0;rt5hb-r 63 sxz3thutsnductor and capacitor in a RLC series circ*t-rbxy6; 3 n 5tbt0w drhztsh:7gsu3uit?

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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 asa3 ui(q5mlpc ; v6ytol5n0+ vg $\cos M = R/Z$, 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 impedancbe 8b e ic q8-c5jbet52:iw,+li b:ekie of the circuit increases if R increases. When is this statemeb5eq kwl2 it i: e,b88 +cebi5ejcib-:nt 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 increaseg;;,ovnzqe ,q s 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 circulnjhe/ h*jze5 d*6b8 za-mb z hyvdg:5b 7q6n1it. 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 circuit, 8q qfvwxo0y112k m;tfthe resonant frequency of q8otfmx2wyf1vk 0; 1q 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 isu tv-b,c(yza g.td:z8 driven by an AC applied 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 seriesx h+ giv ysv0:+ d;ltk6*ajm9c RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatijb(e699 v d-lts7lj6xh4 a kbfng in a uniform magnetic field of 0.20 T. Find theh4 lb jsbv xal6996 (-ketjd7f magnetic flux through the loop when the plane of the 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 i cp5v+9pqnxc. s rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throug.px+q5np cc9 vh the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uni18 kkb tchma 7/h.-mevgjv1 c5form magnetic field of 0.20 T. Find the magnetic flux through the loop k 1h8.c/cbv t-mk7e 5j gvma1hwhen 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 red;dczcv( nxy,( uced 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 changey1 zfdg.(khfb4 05edls 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 turnhrw3qbl2:)cs s of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of t w3r)hb2s: clqhe 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 wireu9aw1xe +u(ok with 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 czk)n) ;oj.t4q 7szzz$0.20 \; m^{2}$ 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 wher -s,og)zb8:m: umexxke the downward component of xgz ):b us-omkx:,8em 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 const5-h a a)j;loziant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiellao;5h)iz -ja d 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 loo*1kcwq *p6ped ps 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 of u 30dbxm ;8o )uh:c yjlj.ve+iwire 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 ifykwvbg 1bz1+6b1 q 0o4a)pahs 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of tbkb 41z)pgfa1 hov +aqy0w61b his 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 consistf:(u w.y l)g)j1hpe0 b xyfpml2qjw- (s of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simpl myp/q g-s8 ,kl7-j-lva wh;dye AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If, -kw7dy j8;yv -/-lpqagslhm 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 c*qzfste ,6sqs.4-awgenerator 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 y9b/sfj/4h yb motor have 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 ,,gj2ge ks2evmotor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generat,veggjk2e ,s 2es 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 conr4fe.:jo 6j bpnected to a 24-V power supply. The operating current is 1eojf6 4bp.:rj.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Thsz/fr +thdo2vg l2+df);4myko5dif7 e o2d)hdi o fl ;s fg 72dvzt4+ky+o/mfr5perating 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 conx bb 0tcxa*-( bsva4 :f.a.;s jzftk9vnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thexsbb;(af9tcj a- tvb0v..sk*fa :x z4 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 primary volv3pj (a:hi/vh9n kfu1tage 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 transformerc4 ozq aq89e.x causes 14 A to flow in the secondary. How m94z qcoqae.x8any 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 h(v 9noql.8h1nx f.y1z*fyzji/n6c u8 /g dfz a 110-V primary if the 24-V secondary has vf1/6ijf. o8h1xnu *. n(9/z nychyzf gzqld8100 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 6 3v lvqyxo125i+lkitprimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, vlt3ovk6lq+5iy1ix 2 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. Ayqf qoljh7,: -nl ;xnv;l xxf29g1/p mssuming 100% efficiency, how many amps at 24 V xmlln:n/; l1 72 v; q-9hfox,jx fpqgycan 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 providz5u5e) a-p yaoes 7500 V at 10.0 mA. The primary coil operates on 120 V. What does theez aop- 5)5uya 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 turn71hofyu n1x( ds on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the 1ydx (u17fonh 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:*r; bsd ,ge(4p ekhfj its secondary coil. If 120 V at 2.0 A is appliskb4gp* :je,e(; dh fred 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 itsdvjp tm g/7c.z0f jwwn 1w4-m)8 1zblp secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current atn1/v-fw4m7d0 czwj.bzmwl p)gp t j18 the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sec(pm6*mv6 kwdaexxk f; ii4u16ondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage 6;pv 1m 4fi (k6i*axmd6uxkew of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns3ox +.ti+qoh o*m v8jd+q(mj;yp f3zs. If th8 +f+*psojztq( qod33 ;hvi omx.+y jme 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 V. The voltage i 6h2 ..fqbrs,egsu fz/xxc 2)w*fdv1 ss usually stepped up to 4500 V by a transformqshfvdb 1x f z2.w6)ur2 ,f*/c g.exsser 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 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 usual 2bxlge;5 2agnly stepped up to 4500 V by a transformer and transmitted through a power line 2l;x abge5ng2 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 ) lcgv;d: 9u*+rcxux)*jyqyb60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage+uryx) jg qy9ld;ccx*b)v:*u 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 totaw*2a8qdz -pzo;u5qpxl 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 voltageao w-; 5p2pqdq*u8zzx 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 transmissionyllfua-nkk9 n6 /e:n7 line 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 percentagk6f- n9ue7y/kll n :nae 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 dow / *iflx/wq-kdn a 6-W line at 1000 V. How much less power would be lost if the power weref/ xil /-*dkqw transmitted 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 i. 4tipk:u279b,offk e6bhcp line with resistance of 0.60 W. To what voltage must the generator outp tkkp,4hfifue :pc2bibo96.7 ut 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 iy7t ck,epnz94t;l2x h n the coil's magneti9cth7 xzt ,pk24ey;n lc 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 )kx2k6hzd6i d; u-pm fcontains a 6.0-W resistor and an 18-H inductor. What is thiiddpxzh ukf;k m)-6 62s circuit'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 vol0gzon4v rb//o;mcii(ap ;c ;q tage in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V ACpab l7(: f qqucz 7-0oppd4l.b 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.zx0 + dtg mf82-7wg/ldri7 dac What is the resistance of the lam 7d/i0c27- l8tg gwaxrfd+dzmp?

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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 peimh )qt4w9vvf8x: g+f17wvxp ak current thro9pqi4+xvvwt)ffw hvm: 7 g1x8ugh 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 power disog9/ jdy;g7ue w,i +je)szy vq )-fs:wsipated in , 7fow-v9 )ejyjwgq)ei: s/zud;s +gythe 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 2vu,yj.,jgp)w to ot5e .s0pa 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5h 9to83 fg,itk0-W 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 resey. 63 6m/bgigmci0wooqgr ,( 0(fyewistor 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 inductoryv82hhmq0 -,. qugg gi 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 x*1y0 7rk4j rapcw 1efreactance of 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-mHs73 +qs ov8q o4zc2b 6kacno1q coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nec:n c wj;qp.-2:zwvmoi essary for 157 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 frequency of 20t 2t ,8zrslc0x,h,g- f v.pamd kHz is0stga hrv p,m l,-t x8,d.fc2z applied 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 26k;o6n e0m z y9aol- f8vkzul).50-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 cap1dy/depk-0b b7c gpqea .he-9acitor 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 nq,p87y;fay yctance 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 10-49rq5upz2.vx 9uixcm6 5hwvz h 1luc8mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.01a yiwfszr6 sn ;b7l3fy n*:e;irv. 6 /r42ennp0-mF capacitor be 100 W?24y:6 rbp3ir.e7ls w ir*;nen a sn6vnfz;f/ y

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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 Hz 3obu3duvhingd 3:e47 d r3lh.and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resfivl4n(* p 9dkistance, 15.0 W induc9i *d4fklnvp(tive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-; nbgv yrwytpf6i3l138 1cev/ W resistor, 20-mH coil, and 1.0-mF capacitor are connl3;31/ vn1vpf6t 8weg byicryected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz :n+.*jpb /dh2o zplebn)w5zn if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s+zebondl5)hb n :nw.zp/*2p jeries?

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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 connectesgmdtsut h2g k241+a4o: jc t-d in series with a 20-mH inductor, what is the impedt- 1s42d4gc+akjto 2: ugt hmsance 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 n j)*t5x**vspdz.d uxseries with a 20-mH inductor, what is the phase angle at pj).dd*zstxvx*u*5 n1000 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 mehxiq w9 2lz(d2dyk d-x-j4;and 1.0-mF capacitor for a total im9x2j yx-;eqd hwk (d2-z4 ldmipedance 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 100-W resist2b dvg8u;-3rq kqt oz8or and 15-mH coil to get a total impedance of 110 W at 2000k 3-u vb;rqz8dgqt2 8o 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 at 5000 Hz for a t j99fzq5bpgwkhk htu w 3(i1ka d,21h6otal impedance o u1hkqwfi 5kag,tp19j63( z 2hkhd9wb f 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 resistor at 1.0-MHz for a tow/ax+o gjmc5l qy81c3plqv81to jccq8wyllgxm3 pa81 v 1/q+5al impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wb-yruxsi 3p5nv0 4i.i ith a 20-mF capacitor. What is the impedance at 1000 Hzy si30v 5b.-ixpruin4 ?

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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 kl ,yelqyssh+/8zgf9x2icw+ 8Hz for a total iml8 zwxq8leg/9cyi+2sh f+s y,pedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz .ke5v no z.st/4j .tptfor a phase atpj..t znke/s4t5ov . ngle 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 neemo*mfdg / f2*lded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 lgmm*d*ff/o2W?

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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 sere0yucy54 w l5o4 elfh6ies with a 100-mF capacitor at 120 Hz. What is the phase 6f45504oe e ly hcuylwangle?

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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 if6oj -chuocgi g7 .07bw a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec o7c c.ibwg6j7o hg-0uted in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-5e-t9 axw(1:m7bd9 j +)kppjrfusjvfmF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whatjv9pfmu)bat k(wrxefj9+- dp15j: 7s 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 capaci+g*uo d6vi q5qtive reactance 30 W, and an inductor of inductive reactance 30 W are connected uq gvdo+iq*5 6in 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 containinge k4zh6(k;gc a a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connezkh ceg(6ak4 ;cted 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 h(g iawe(w0b2 series with a 500-W resistor for a phase angle of 0hbeaig((w w2$40^{\circ}$ 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, Lk jboa(of9/ .c0o7 byt = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driviaokbbo.0t 7/9cfo y(jng source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resista5pb94 f(re0w 5qufvy ance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to0bwe 4yp9fv uaf( r55q 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 isu9j, v* f)/ f9 zcv 1d*wmhonia4k2oyr $63^{\circ}$. 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 impecqi /-r)i( eyj bbar4oios 5/h2n4x i/dance of 60 W and a resistance of 30 W. What is thb52y4-oraj 4ii//)( /ri xo cqs heibne power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistu eyn1qf1x;.6 zo6jxwor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powef6 ;xuoyj1. x1z6qwen r supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil .eers7k7x, f;;kaq oh in series?ex esqh.,of 7k 7ar;k;

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neededix;1y8tj/l8nl0 t caa in series with a 4.7-mF capacitor for a resonant frequency 1ln / 8yjit0; al8ctxaof 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 np/ ogk yz,3 t(fm3mu/a resonant frequencum(kg,z/m o3yt/fp3 ny 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 with a 30vbo5t +yt;vs2*ihtpqy9 -j 8 o-W resistor and a 40-mH coil if the resonant frequency of the circuit is to bep8 oq+ yvjib5hs-tyv ; 2o*tt9 1000 Hz?

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