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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flt (yysq,9z pc;-uzxg e24m q1bux 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 induclrr wyb8,:2yzs,q -c ction 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 chx h 2vz(7snx,*1ty ytgv :nn;kange on the t:12(v*;,zyxnnsgtn7 xhykv induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through alp3galim72h t:ia 8 u2 )s1e :ioqkjt4 loop of wire produces what ki) 8jmi3i1 oau7:h:iqttl4 s2k ga2lepnd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on /:*8u2yn*xbdtw a vke /maau/ vt6;op the inducedu 2nakwue va*vd/ta*y6 ob/m/:8 tx ;p $emf$, 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 fi6-1ekp tg0u 0xdfc-p zyc oi25eld 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 directionflhgx gk0k/ c0d6+ x:x of an induced current in a conductor will be that which tenxxf xhd0/ 6g lk:c+g0kds 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 on a horizel-lc(c b*,o yqk x8v ,)(hkypontal table. A bar magnet is held above its center with i)lo (cepy8b(c kxlyhv,k*- ,qts north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abo nh/ 1kw4s,caave its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from ab4cswnaha / ,1kove)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vectog(wyky5 q32n ar points straight up. The magnetic field3ka 2(5gnwqyy 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 table top in a region wz(n q 2,b;k fe0l p)my ,ovb c9.o:qlo4guok:lhere the magnetic field vector points straight up. The magnetic fielnl,,0uo.geo; ::zpo)mkl kylf 4cqbo q(v 2 b9d 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 region where the magnetic fieyloc7f y9.v )qld points straight down. y9ylov).7fq c The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal talw1aa3p f*f-jble and carries an ever-increasing current northward. Two coils of wire lie flat on fafp3jw*- a1lthe table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. sgpb wtus0 p;o:azv*kz4ei(qqz q 43a3k q7 6+As the north pole enters the wire, the induced current will be (as vie ba0wq gz;q4*zq a:s(tzvp+e46p k qis7ou 33kwed 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 jya 0t7q/n osk q(*cv2is rotated at constant angular speed about an axis whose direction can be varied. asqn2(qcy 07/jko v*tIn a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 oz1a)o 0 /orq bue1,hurotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mustub ,euzho ao r10/)oq1 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.pw n;ittobh pg2 .j892
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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 s-usa4ki0 al8 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 fii 9*wphmrglx46ko+ :beld. 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 srbgftayx luk45 f.: s*21l1rmoved northward at constaux yk.ffa5 1t s*bll g1rr24:snt velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a co7km.uw0w:c q )6sjuiw6gt 0ltnstant 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 generatox f8kq8m.i2u l .0xxenr 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 revolutions each second. The frequencyfy2.*gh)e, y voxf u5)xx m1uy of thefvf),. u)*xxy 2 5 xheygu1moy $emf$ 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 de1; :-ld x xzb931nplx,f6co facte4yg vice used 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 thatdj: wkbrhj -g,.v1uy du:t g4 p/8l2nt

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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 sec0d y *m d51gxo/mo3iicfe3i *eondary coil contains more loops than the primary coil the ii *ie1do*3ofy0md/x3eg5cm n 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 loopswmoy0simk6 +6 than the secondary coil thm6ks6iwmyo 0+en it 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 powerch:l 1wsm /xep* 0d*gzk 2ujt3 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 circu //s87;ni-oevukmulm it,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connel0jos 7wib.xw*v;. mjcted in series to an ideal battery of constant terminal voltage. At thew.so j*j b0 .;wm7lvix moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batterq ri42ihzo60 o:ft5pl/py nu3y of constant terminal voltage. At the moment contn5io 3fi yo :0hp62/z rt4pqulact 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 is connectedq;u7ze uvp. gnb l26c8 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 r-6u ho-qkdt. 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 connected in series to a battery. The timh qih)b.+qcn7k 4kh,m e constant for the circuit represents the time required for the current to r7,. 4hhhb +iqq)nckk meach

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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 yj) je8 g4 +a)f8b0uxyt ysa+eto a battery. The battery is suddenly removed from the circuit. Thbea jt 0au4y+gyjf8 es yx+8))e 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 have the same r.0 gaub6w oq/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 this circuie*s n9yf;u3yr(jtch5wkws ::t, 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+uxn vjucmj0 , 3qypf sl;*w,* circuit, the currenw+j ;,,u0l*fsn*yuvxcp 3mj qt

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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 awu9uu36k qe :pxo; 3vzc circuit changes by what factor when the frequency qku3wzepxuuv o; 9 :63is 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 doubledxu j9w e7q0h/x, the inductive reactance of that i xu7e/9x0hwqjnductor

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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 vol2 wv*v3w6j*ejp r-ahltage across an inductor approaches zero, the inductive r -3w6p2w*vle ha*rjjv eactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the 4:uh+b 9w o+q jgc/vrxt-ah8 tcurrenbhogj-9/axv+ +r:4c8 ttqwhut

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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 .)z2xsffs6; q3u( (iczjotrzt -b h.hby what factor when the frequency is tripbit hs(z.th(.qs 6cu;jz x23)rf- ofzled?

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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 ca ql0 83khfp:4q1yy gsgpacitive s4y0p fy:lqgk8g3 1q hreactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and ax9ach )4bg:z capacitor in a RLC g4zhaa c:9x) bseries 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 uxqa:y js/sg51dw. y5jog5 +cRLC 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 impedance of the circuit increases if sjzv3f5jhx4 o /py. q;R increases. When is this statement true?3x /vzs;5jo p.4hqyfj

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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 impedvmz a* 83lxmixi;pg q*5(8z jyance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circ,q0d *ifn szd7uit. 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 a3)xy4edr;po lrb8:x en LRC series circuit, the resonant frequency of that circuit willr;4 ybo re:x 3x8p)del

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. A9ln(mm8c ac1y: yfh u,t 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 circ4 pz5zbkfkk+-m .xg6w amq,o8x-8vm i uit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of e+w-ffcd6+knre 5gf. 0.20 T. Find the magnetic flux through the loop when the plane of n-cg.f6rd+ffke+ e w5the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifor1ej xp4c8nw*z1xo y+c m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop o4 w*yxx+ jcz1c18pne 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 rotatw ey-g4x3jt006tmqk 3d hw76wxfwi i4ing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie xd0xkgw3mit j30teh 6q4w- w6yw4if 7ld vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced froi 5. qsll:0ablyy:d5gm $1.0 \; m^{2}$ 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 c4yf gfc s4,gr8oil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns lbzjk nvb.fgy g*j 67le. (.k5of 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 avek..fyl v*z7e bg5jbng jl(.6 krage 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 tm4bxt d.8d x7aurns 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: q1vo5 c;hyua+vkm/t $0.20 \; m^{2}$ 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 hob9: c kp-dk/vzs5/,kp suuwca 42yk(t rizontally at a location where the downward c9kpdp/k y zst(w4uvscb/c2ak- k:u5 ,omponent of 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 rota6,d0 rr/ttx vktes at a constant angular velocity of 2.0 rad/s about a vertica0ktdv6xrt/r , l axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional art(8 +km tvla8 ujlq 3mv1dc46jahes53ea 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 wi ,yk 7os4p- osjnv6*fare 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 8eeskp/g /i ;p,cr- .s8atdgr5 0 rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of tee 5pga;p s,g /id/skrcr8- .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;l9ez xfa* flb w1jq 8w32ude* 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 sim 38/pfj biex:i n)3kwdple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the areaj )p/e: 8inkbdx33wif 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 au *dl/u3r 6zsr 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 resistanc,gb 0*vshbvtpm1r36w y/sie;f)izf* e of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor .ck/uah6v e: 1z nng(doperates on 120 V AC, and when running at f(/gu1nc:v .nzed6kah ull 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 hdm2 js v4;+gd24-V power supply. The operating cgs +4 jhddm;v2urrent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to xycu6 h2+7ul za 24-V power supply. The operating current is 1.0 A at yl7x+c zuh 26ufull 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 resistn;2rul u/qa4 s* tam1eance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What ia t2;e l uqs*1amu/nr4s the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed toub0 iex c)wteie3su.9p2onw14 ) z pc2 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 ofnyii 0l. a4ec.ed- xu7 a transformer causes 14 A to flow in the secondary. How many turns are in .yxnc7e 4i-dea.0iluthe 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 tr6,y 5:so- osl uax:syurns are necessary in a 110-V primary if the 24-V seconsyo 5 - alsor:6,syx:udary 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 consists0jh 6m8sdep(i 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 current in thd6m e(0jphi 8se 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 trg;bi vr ,e fiy(5bc-(he primary of a transformer. Assuming 100% efficiency, hr,c5(f; yirb(bv-g eiow many 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 transje.*ri2e ) bdlformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the rj i)bld .*e2eprimary 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(fhif9r4cr/; r-zg sldbr(s6 primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage ir -/sl f 9bs4;rrzi(hgdr( cf6s 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 it5b15s c7fjh qps secondary coil. If 120 V at 2.0 A is a pj55cfqs7 hb1pplied 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 secondaryosklj+jvjwo d*s v(ze4 )g3p is -/1q: has 200 turns. If the input current at the primary is 100 A, we can expect the output current )+gsv1-v w*4:(sqkj pd3jl/i zjesooat the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnrfuc;e*o*p9qm2d9fe x/ph 5y s. If the input voltage to the primary is 100 V, we /xqpd5p fcmu;r9fy*e*o9 e2h can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2s dhkb:nqr zam/. u5.p6jc7d-(cp wz- 00 turns. If the 5r. wc6 mqs ncdapzh/db(:.p z--j7kupower 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 is usual-wkm-h2 :9d yn ;cmrzkjng0(r ly stepped up to 4500 V by a transformem;j-nwr9 zm (y -c2k:nrkdh0gr 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 voltagek7hup+(exb2-x f sp u, 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 tf(px7ks+,e2xub u-p hransmission 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 lkhg50 c:w 3;bvbk ff6V. 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 v3 5c0gl bk6 :b;kwffhis 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 e 9xf)4rop9-j, q7phtwf8 qgv 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,j v )9to phfr4-7wge9fp x8qq heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost 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 of 0.60 W. A generm esa402( le-wfq/ cugq4sm8iator 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 loe(m su2wfg4-l0a8qmesq i4/c st when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less +p hngk.9i4zcpower would be lost if the power were transmitted at 3000 V instead of a k49.z+hngcipt 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 iafoi2rsah 3 20s 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output s0a fir22ho a3be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in t3f83u0t*jx )kiyi dkf he coil's mag8fjfdtux kyi0 k)*i3 3netic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H induchuv4/ sc(u8 5rktdt/dtor. What is this circuit's tict5uv4 h dd(/ut8r k/sme 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 al. ,h (g-kocbon 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 AC outle ju u mc*fv3vr*lo6k2ni**8lct. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the9b(ainz2l 6qykfo.4 p3drk : x j1rh/u resistance of the laq andr h1ru23j(y 6/9o:kix4 p.z fkblmp?

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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 dloyy 1 5r1m(bpeak current l( 11 rym5ydobthrough 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 supp-0zzcx i19nd 3wq*b xr69yyc k;b.syvly. What is the power dissipatedy cz br;svwy1 n9- *30qc9bxkyzdi .x6 in 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 rvqcs5sc8xb qs2 s; (9qesistor 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-yj :;+zx*+xajpl) rnn. i fq1vW 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 resistoyn7ucvy6xfl856 a5 elr is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 H) d28 xn (7rrb9/nwpmwh +qysek5lcaf1co/ -zz?

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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 2.50-mH coil atty j7 f jybu,gh22aj9; 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 hwj7 sbr 23;avcave 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inducti-z2af)po- og m e.)tztve 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 1203jw3z2xqqyqo7 6d4 n y V AC at a frequency of 20 kHz is zoq 3 47j n2wyy3qx6dqapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz q47x.sux)ydo s ( mjc:i8)zq0sxjs g)ifde .6source?

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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 reac-upal5sdv( d+ va:y*atance of a 4.7-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 . oka.nw(jw3vkv* 8 wp50 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 capacitor b0bp3 o8ybaqu78zw2 t 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 0.010-mF capacitor be 10pkh7v3yf+9g c 7qh 3zx0 Wzg 7c3pf+qkvhy9 x73h ?

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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 zdz7q)9 r 5qnaand 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 1wjox.hyq/dx:dou 1 812.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive react d o1q.wdx8oxju h/:1yance?

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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 Hoi s+ (k6idpz5z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitoio+ ( pkisd6z5r are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle c g1) 2qb13bo 6tss2kcb -bncdat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i 1tnbkdb3gbc 2cb21 q-s 6s)ocn series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series wom8/wy (jev5+h i *h3jqauk *)xecv-uith a 20-mH inductor, what is the impedauji kueh a/h)e* j*y5v-x+v cqmwo(38 nce 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 isy- j o.ie3l)c akq+si) connected in series with a 20-mH inductor, what is the phase angle at 1000 Hj+3 i.l o-)ka iyqse)cz?

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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 cir :cd ;pohr7uy k6t)al/cuit with a 20-mH coil and 1.0-mF capacitor foyou7kad :/ p)lt ;6crhr 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 capacunlcj58*hqy 2 k jl02fitances is needed in series with a 100-W resistor and 15-mH coil to get a total2 h ukqj8cl0 ny5jlf*2 impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH 8a+/gg0qks- qfs9e3l pcc a-l inductor at 5000 Hz for a total impedance of 40000 Wg-f 0/ sq3-kcae plg+ 9csa8ql?

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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)n :eey,bjk3x put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 15 bjye3)n,:exk0 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 connectedaq3y te7)+ h2ecdq+ctm9 v-zz in series with a 20-mF capacitor. What is the impedance at 1000c7)zzctd qem23+yvet- +qa9h Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a t9e.nookn./r m -pe qg)otal impedance of 4/ m.r9oo.en pn)eg qk-5 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 kHc6r smw804q 3hnyl-zn kyn (;uz for a phase angle wy(rnus3z 4 6 knq0my-c;8hnl 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 wit0ekpoixu tfto*v 1 6t) n69b;lh a 30-W resistor at 1.0 kHz for a total impedance of 45 kbul;0*tn6e16)t fp ovt9 o xiW?

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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. Wnk r5lx(zxh0p k7y (/ihat is the phase ayk(/i7l(rnk5zx0 p h xngle?

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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 andeid/v wz(nx0uj tc/: +5gb9qf 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF ca+nuf(c9i/:0d bt qjexvg5wz /pacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuiti si-u f 8xrb+5yr/9vor6nr(v consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. Th 56f +rii/ sry9 uvob8(-rvxrne circuit 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 reactancvv* n rjp-zva:-m,0jt lugn:7e 30 W, and an inductor of inductive reactance 30 W are connectedn7n 0lu*tjpz av- v g:j:v,rm- 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 RLCk6/ y7*t hb3p k or 2 nw4bq7vs3oynso3z5m;mg circuit containing a 50-W resistor, a 10-mF capacitor, ano2 33gw* 7boymmp toky3z6/rsbnh54 7kv;nqs d 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 series with a 500-W resistor fo4u g4c iohd2(jl 0nnt3uc2vf 3i3bx8 hr a phase angle of tch8 i43(d gbc3u3nf20 iluhv xj2on4$40^{\circ}$ 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 = 2n:rx j,ph0k:h+ wq jsi7d,ya90mf w9v0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be dri qi w7,h0+xkmjr9v0fnwyhp,sda :j9 :ven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power outpuo8lqvcf;ib 41g9cu yka8+ v4qt in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conneccl+fqqv8484 9bc1gi;k aov yuted 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 circuiq .dorlys0z g36 /-gort is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 jul hhlg el7( *(:+xegr.zvy/W and a resistance of 30 W. What is the power factlvye .hex(+:ggr /zj(uh*7ll or?

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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 adbq z45baa8f 3-fx5ky/yhvr 0 series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductoryv4axf-r bb 53hq f/daz50ky8, 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 capacitor and a 15-mH coil in /870xmtb w5;jklj; :fmd)c etdv ar g-series?/ -rmx0jjtt wlad7f;be c85dmg :k) ;v

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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 ser 2gmoc42sglp+ies with a 4.7-mF capacitor for a resonant frequency of24 m2plcsg+og 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 reson:fsbmclk 2i5 -k*/wzj ant frequenz5jsl ck/ m-:kbfw*2i cy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor hb63hg.,th:c .3/c kqxwfsv cand a 40-mH coil ic6k.b hs c3 tcfh.wx:/v,qg3hf the resonant frequency of the circuit is to be 1000 Hz?

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