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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: 匿名未登录  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 u vh3kib v2x*e6 3t(cdwnits of 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 induct.02,n urcrg gfbm8u+s d6u sb1ion 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 yatce.vj iz+2u7z .dtz:/hf0 kind of change on the i/7.yh+audt fz2ji:0tz.ev c znduced $emf$, 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(:j pvbcv-5o.8gsr izwl:y 5q magnetic field through a loop of wire produces what kind of chalyq icb:vwz jo .:r(5p-s85vgnge 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 ofwgftrfz,;fw,pk ;fba-5;gx * change on the induced;;5f px g*,kwt,;ffbg-zf aw r $emf$, 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 /b(rrae 2n1x , y+avwwfrom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the :.qx u(fc t/ztnt6lbhf zjzxx.+f, )1direction of an induced current in a conductor will be that which tends to produce which of the foll1t(qxff+h.ut)x:xbf z 6tncjz l , /.zowing 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 horizontal table. q2pxoy/2f9s,1slflo A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abovl/y posfq sx9f2l,12oe)

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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 abotcra p *2+oes*ve its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (whecsort* ap* +2en 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 br5qa-mp1l3 s9 eidbix b41,*4cx e v9 echa(jin a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fad1b-xl41 ( ,vs4x erh qpjee icdm*5ba9caib39es?

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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 s.l(i(y5mb xyh w.lzo5qzz+1,g x 5evlevel table top in a region where the magnetic field vector points straight up. The m.vgozx .hl + e5b swly5 x5z,zqi(my1(agnetic 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 tnh w jb)iy f6)+yf:sx7op in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currf ysj +:fh6w7nxi)b y)ent 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 horidh3 dwq-pvs 8k p)w5;yzontal table and carries an ever-increasing current northward. Two coils opdvpw85-3kqyhd) s; wf wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nm-:mj-lj+ j xhorth pole entering first. As thj+m hjl -x-mj:e north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant avix6wbap9h84mjk 8p , ngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orijkm8pab,9v i6wp84 hxentation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant 4owktg0 k kysf 2()/fsangular speed about an axis whose direction can be varie)fstk k24owgsy(k/0 fd. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law. q.v5+) mlmchn
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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 t/1uzl6ue,)s kaj1 cns/ t+deh yx2g j;hat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field.mrm9nk /a5e ;e 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 dir-xzewu6(g9 sk ection) is moved northward at constant velocity through a magnetic field that poins uxw(k-69zegts 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 rotatiwe e3lw2; f8i(r ; o3dge.aukes 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 transfoxn8o;o/ rpvp7rms

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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 frequency of t1ye s629oblk+tnh5 xwh ks2oxw9t+ lbh1ye 5n6e $emf$ 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 i,z+ rfb ,lru:*3suhtq(y/ zd 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 devi,o37 niu *;xet v7cg:u q6jbklce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the pruy9c54qdww k(m chy6sh4 *n n0)qgp;f imary coil tpu d mgh 4hs) 4*5 n;qcny(fqwy69k0cwhen 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 + k i6r5hbgz 41bnqs0ythan the secondary coil they5zhrb+b1i s0gk 64 qnn 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, th5+x 1 tinql:ome power 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 circuit,pgdpg . l;e --* xcr85e)kpqir

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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 conn.r1 s k fzt4q s:g8,atm 1gy,hszb*j1kected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battj,14s*1mg1fz ta.bqrh k 8ks: tsg,zyery, 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 t1kh76xd hhu*/j08c : iet adtzo an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thehd 6uc8d/ j*zaekt7th1i:hx 0 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 connect *,v3xidbxi* aklkucjt-9r4 1 ed to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and gm, fv ui,+lc.-tojw0resistance 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 time ck/ b le(jj7xn;onstant for the circuit represents the time required fokben7(x;/jjl r 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 conne8z u8o( uw ;-/gtcokctb ;qmh)cted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requiredou-m o8qwg ukb/ c(z;;c8t ht) 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 thenij9y ;wmki.r 8 qlg+. 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 this circuit, ts2zjh2n,ublpw 1 /j o)he 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 anr1ckls 7qvvcfp4 -n4 z ,iwx*h4k9 2rc AC power supply. In this circuit, the currenxv v71zk4cqp,9rl rk-4fch w*ni42s ct

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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 ar4msi*c/0eo h n ac circuit changes by what factor when the frequency is troris4/0c*m ehipled?

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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 is k/d0ww*+e k,chkc -qnductor is doubled, the inductive re0 kw/w ckqde-c* hs,+kactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the Av mebi 3m9tk6(C voltage across an inductor approaches zero, the inductive reactanm9ibm (36t ekvce 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 thish*far *kctk -6 circuit, the currentch**- 6atkfk r

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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 facthd2l2lpf69c-xri u w 93ta 4tdor when the frequertt3wl 9-uifx2 2 d46h d9cplancy 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 capaci xtvek83qlp: jcm)07 ptor approaches zero, the capacitive reactance of that capacito:8xkp3c70 ej)qmt v plr

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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 m538*sqnbpd.. l qudp between the voltages of the inductor and capacitor in a RLpsnl dqq 5m8u.*3dp.b C 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 Rxceqm0yp65t-8 b2onz LC 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-6c7mq )du kxowgjn :, R increases. When is this statement trueq ) xwmk:jn6ugo,d-7 c?

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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 3aacuav cwr:w:-w fw7f e2cb)mnc-; ( the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the :mw, lf0c-yjei1r m d f2fr1i2circuit 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 circuitx+, a) seez;ua, the resonant frequency of that circuia su) +;,eezaxt 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 voltage. A3r fml,b -qh une;x .gc8vn2u-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 circuu7e7 mm +iq*n*3pjv erit 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 radiue l4 1vez-kman hxiakv;o.f8n23i3o7s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throu8fmkxvk.1aeh-32o;la3 ie z io4n n7vgh 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 is rotating in aapkuy21+q rwqp ( s6)p uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ak +)rwapquqpys 162 p(re 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 ihtj8kz7 u/ln:c. h2fos rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag8h2:hfonu7 / lck zj.tnetic 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 adjustabi:e 6y2pbzwv)h +r0v tle 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 coi21ftc py- .iagl 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 of wire on a square fravf,-s b:6am zhl jbeu0j6(tt*i;, ob hme with sides 18 cm. A uniform magnetic field is applied perpendicular to the p,z eaholimuf6; -, *hv0t: (btj6sbbjlane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of (r7kf:lgl dk 5$0.40 \; m^{2}$ 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 arekihrm2)fr*8 p xf 3z: kbrlw89a $0.20 \; m^{2}$ 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 fj5f6 bxfvzzax apf / j/kqv5-5v41 i9ocm9 1arlies horizontally at a location where the downwardzqkx- a1fvrvf /f6z4 v5 1pija xbj5/m9ca59o component 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 barkfu kxg5*x3fs : xc)4h that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a ve*uk5 k:x3xsgfh) c4 xfrtical 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 55pyz(xnrzh5, 9 g ln,x0 loops 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 wire of area utj0ei 0/*op/gwp9i s $0.090 \; m^{2}$ 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 r,0) im3u(64vtw a7irjjwl ezk ectangular 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 wjr)aj v 6 0ze7,(i4ktimw3ulof 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 10dn+a /, 2a moby9gtlvwwzd l(,a.; rl30 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 constwcxqe1 yd/* c)lda:p*ruct a simple AC generator with an output of 12 V madd*ey/awcxc 1* :)qlp ximum when rotated 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 maxim*g8hipri 3e h ./akp0ium $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moe;xjlb -q *gxo1vku8l,9 in i7tor 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 DC3201i,tszisk /hgagx ued/ o 825 ajeb motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fu238gg k,e2/ ouea /shx za01jb5stiidll 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. Trl.dq0*mpglp9g 3r s5+, j69eua fykbhe operating current isa lf39*pggqr+d 5.y 6e,jpru0 mk9slb 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 a dnk-o 9-w:- qlgjum t,24-V power supply. The operating curren g jql-9u-tk ,nodm-:wt 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 24-V,ishgh4 y;lx) power supply. The operating current is 1.0 A at full speedhls, ;xigh 4)y. 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 transformerv 8wramv)f*w x6q)t7 q 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 of a tranv p 7(s24k 0r51manlvp*ax )k*zpgjb wsformer causes 14 A to flow in the secondary. How many tu x p vkaa7smp1kr42 z0l5)*n*g(bvwj prns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V seyul03vdw 7c-m dwyl 7uvc-3 m0condary 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 p7b3jy3jl:t l500-turn primary coil and a 2000-turn secondary coil. If the current in the secondarb 7p:3jlljty3 y is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assu;xx*w lgd,u9 cming 100% efficiency, how manx*ug9 xwc,ld ;y amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neondn )z5q ,x(ozyof*rd* sign transformer provides 7500 V at 10.0 mA. The primary coil opyqf) 5d*on(zz do *x,rerates 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 its primary coil and 30.t1j.,w g bc 9jzzbtykrrx:,* 0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, w.rbzt.y w,jt19rb :c,kj *gxz hat voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns omm/2z vb49o5 mk/ cjbrn its secondary coil. If 120 V at 2.0 A is akm9bb 24z rvmj c5//mopplied 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 tukxc pea8b73tg0c c),x rns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect0 )xk,c 8pe3taxb7c gc the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformey (fghem pf9)8r has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, hypem89) f g(fwe 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 hoj b ee*f9()vvas 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to b)f* ejvb evo9(e (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 uixkvs.phv3v *5dsol)3-.x s h+w wi+y +ml3ucsually stepped up to 4500 V by a tra +uoly)+s .swwp3m. hii-k3d*3v+xvvhcx5l snsformer 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 iw.a comynw7j(*-4n95n euli usually stepped up to 4500 V by a trn4yj-7w* ii .n9ec5(omwa unlansformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vp8 h,ehwhol;4oltage 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 transhph,e 48who; lmission 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. v1gt ci/ y,uu .81hn)u8ljbuuA generator produces 100 V at 70 A. In order to reduce energy loss due t1ul uu ,1ucbit/h8)jnvyu .g8 o 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 resio+eptf.4l( dyl u7ev 5stance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due t( vot7efp5. dellu+ 4yo 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 transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wolgwvhm3/7: c2pg s0o7 cw/ykguld be lost if the power wer30v /ly cg7wkc: gs/o 27wpmhge 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 transmittq(vsk.d3/ofl6jk6qm o76snmed on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transfqsdn6fmom/637okq (v l6 ks.j ormer 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 sqmtl2 e0/n1o stored in the coil's magnetic field?mlts0 2oen/1q

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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: u e g zxsh.k19(pin88;ofgi fsh(bv1 6.0-W resistor and an 18-H inductor. What is this circ8 p11h8z is.fig;h:vs nbf( 9kegx u(ouit'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 . cjrj;nzen x,jma i:/q 6u*q-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 outlet. What is the 0z4xt*s82aeb4 me mm,qrtu)h 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.( cvml)bb;egui v ld 31v/f7h the resistance of the la.bemi gvd(v ;c3 7u/vlflb) h1mp?

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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 xla+0jy zde8;peak current througay8dl0;e j z+xh 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 r;*2jr2 ktqajsupply. What is the power dissipated in theaj;tr2*q 2 rkj resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor isv qqs+ yml*7tk 2f*j+ lv+v*tn $I = 0.80 \sin (240 t)$. 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,b v hw9in:ehum.i77y;y exr( eft)4i 50-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 rwn1e ig-hj8uz2,k 7ewesistor 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-moqj5 )m0meng)-c +v/bbc+tiw H inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH cbl xl9pqqfh.z ep ,,81oil 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 h1/n ..qw7oez;llx yorave 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 fo1wcy tf6rc k6+r 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 w* h:vqxv3k8y60-mH inductor when 120 V AC at a frequency of 20 kHz is appliedh 8kyxvvw*3q: 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 azyke6(iuy1 *h :ihq3f 2.50-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 capacitor l 6)ru-:miwxqat 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 cu.(c fmug7 w f30qc3uyc ,:uzxapacitive 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 have a reactance :5 rt ;e ygkt.rnkn,9pof 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 oogtb92 t4mbv(j(n;v if a 0.010-mF capacitor be 100 W4bt vo( nbg(ivt2; jm9?

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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 9ypphgog)0mo y; *cy :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 serx,btx+c jo((5iy3 wqkies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W ,+ ( xicxq5jk(3ot bwycapacitive 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 1500lpk5at 14c3o+i0 nr ph4f lbr) Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ibirron3l4+p)ahl 1tkf0c 5 4pn 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 if a 100-W resistor, 20-mH coil, and 15 ljn77im gi5v.0-mF capacitor ari mn i77jv5lg5e connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is con n--xnud7er8x u:gaud(xsr;:nected in series with a 20-mH inductor, what is the imped-unr -8:era:s7xdu(x dng;x uance 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 z+nbow ok3nsb fhkuy22*z .--dm5w3z in series with a 20-mH inductor, what is the phaswuwny2oo 3* 2k sk db+ 5-zh3fzbm-z.ne angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series ci 6w9vkl ykq;*hrcuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W yhl vkq;wk6 *9at 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 capacivuuqo h :3w/vd *hde*5tances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W :vwdv5 3heu/d*oquh * 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 ihp;t4gvt/fh,e8ur 9 zn series with a 450-mH inductor at 5000 Hz for a total impedancehhp g ru4fe,/zt;89vt of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz 4 eou-(. tkhsufor a tot4u - ek.(oushtal 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 with a 20-mF capacitor. Whaa5b- (5k2xj *obl ozfat is the impedance at 10o (xja5bkb 5lfa-* zo200 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 need79br3( g8b.fac lm h0qxpokj :ed in series with a 10-mF capacitor at 1.0 kHz for a total impedlm7. 8:j9bxfr o q c3kah0gpb(ance 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/3g6ks9wt3 ;fna5-yrxiu6 rb5ul usl 1.0 kHz for a phase angle olsrx-but93r s6u/kia w 5f;gnl 5u63 yf $40^{\circ}$?

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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 1.0 kHre2po3y; 6xvd((o gohz for a total impedance of 4;o2v6r (h g3oedypx(o 5 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 dn54ffpq;+km 20 Hz. What is the phase angle? ;kd f4n+5pfmq

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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 a 100-W resistor, 20-mH coa5q jy-g 0r+svil, and 1.0-mF capacitvayg5 js-rq0+or 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 circuit consists of a 100-W reg m1j8j;tu5s6 /helkosistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 608s651u hg o j/jlt;kem-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 Wgrwv0w7 2j. mt, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz p7 mwtwjr .02vgower 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/+d zi(kilw) b a series RLC circuit containing a 50-W resistor, a 10-mF capaci)i+( dbl wzk/itor, 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 necessary in series with a 500-W resistor+*jf)hnnmz o vx-pa(yh0;o: v for a phase angle of 0)pnzjy;voavxh-h(:n+ fm *o$40^{\circ}$ 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 = ,+ceybi 5ame0txa9 8w20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order 5 ai9ta,c 8+0xeyemw bto 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 output in an ac series cirv ej/1af3 q gt.azh5,zcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit 3z5,he q.f/ jtazvg1 ais 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 circse7mb2;zgf wo-t k5cl3f 70czuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a2 rbxxc-u7- pe resistance of 30 W. What is the 27c-xu -bxerp 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 s;m;zo5k utbg6eries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0. ;uk6t5ob mz;g45-H inductor, 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 capaci w-ul(fn3rc3)s4 q (xgdb cct*-1zjxwtor and a 15-mH coil in series? jx4 ( sdwq*n-z( 3u1w-t)bc3xrcgc lf

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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 1noclvql* p s2mqj 3+1with a 4.7-mF capacitor for a resonant frequencyspq1+m jc*2ll1qv o3n of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductokrx1qqpuq ;s 4:fs(8-se u)o6ah c 9zar for a resonant frequency of 1000 Hzs 4aq)6ae fqss xuh;-qr 91kuzcpo8 (:?

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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 resi)qk.v.fx4szd)gplfs7i 9 uf7stor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz4dl gk)u pssf )xv.. 7iqzf97f?

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