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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 units of magnetic flux excecex ;p xc(p q+n uwnt/yt+eg d4-u339ept

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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 inductiw i,lu1)isx)mwmm) ,3ethh f7on 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 chr9fo1 u+*1 up0vkemf tange on the induced 0mvr1f up*o9 k +fet1u$emf$, 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 a loop of wh9w6mw2vrqgk;.2w ;dj b fkv5 a3p;frire produces what kind ;6rjwbkrwa;qg v9 w2p5hk3m.ff2;vd 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 nh5/x sow+-hbwhat kind of change on the inducew+/5x -hsobnhd $emf$, 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 magneti*ccl4 x ,u rfi7dpa3w3c 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 la:ppk 5du5dz4l. n h*bvw, the direction of an induced current in a conductor will be that which tends to produce which of p: ul*z55hd4nd p.vbkthe 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 fs7+;e,su eo aflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when vieweas+,s eeuo; 7fd 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 horizont ::vh;) cmtg-3g; kh,wjh4db cua f*)xia.zvual table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when vieweva 3adu x:. g tm) ,hchhjv:-kzwb uc4gi);f*;d 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 field vehi td7x;4p, qaz .y./yr2waeq ctor points straight up. The magnetic field vanishes suddenly. When..ipdry27a h e,t zqx;aw4/yq 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 where the magneti hg;7..kc.jcjmow3oof:m04n ln4 a xrc field vector points straight up. The magnetic mw.khoxo mn:oc nrf 74.lgjj30.4c ;afield 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 ia4bdo5)-sclv n 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 current in this coil as the fi4obc5sv) d-aleld disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries /h ne+sevnd h.e;39pjx*fk w5an ever-increasing current northward. Two coils of wire lie flat on the table, one on +9phjhx3d. en5 v/fknse w;*e 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 e+m *fo,hf8hqivgccm:;s e (.u:u.hdg3mp/xd ntering first. As the north pole enters the wire, the induced current will beu.dx;usffpgmcqeg h d::ho+ , 38mv( c*h/.i m (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 wido05/pwheg1 8dnddq:cpq ;p48 vqwx9re is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, whcpp9d nd4 v0;o1egdwwqhq/ x8 8qp5: dat must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constantb7 /avlxb9cb76 kt,x y9e4l qb angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of ro7xbl9c et7lx4b6b ,a/yvb kq9tation 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.ej p6ha:9 hl4g
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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 thatx-7j m wlvtu;vd p7p)5 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 f(d.xx5wjtzw * xf5w.u:wr se*ield. 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 northwar1f ez-8 7jr/ 7hsuytggd at constant velocity through a magnetic herfjtugsy87z1/g 7- 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 veloc - (qyrg.aa4kbity $\omega$ 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 qlyt 42 k*.u11f ; jnfxbqoyz7transforms

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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 revolutio4xf1yx ht-ke+z /n j-gns each second. The frequency of thx -yn - hetg1f/jz+4xke $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used t)0 m/,hix d)k tu-*a1plfnqq 7sql-blo

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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 that y5/nfb.np i0yu kd+m+

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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 tha5 91 /xfrgkskp r:rva;n the primary coil 1 s arr5p9x ;/kfv:rgkthen 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)hht 4yd7x c8wer--dr o2dja7 primary coil contains more loops than the secondary coil then)74co7-ddydh2x 8r he-jaw rt 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 power ini+0;4agxj c3 ng )cnulput

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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 cir+dx:t(.un:sa x txbu0cuit,

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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 inngux0gi ; r-0nk)m9 yqductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrixun-00 kgq;r) yn9gmoss 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 influ5pt y(2hgvcis3 5)s7 jf v)ductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with hlfvi7yv53 j)f2s cg5ts( pu) 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 indui (q0np;x:lf 9sdm7 fyctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L andu;op n-fuai1gk b0 z78 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 time c*is ox3qod5j ym./kx3onstano*m3 sx o./i x35kyjdqt for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor - jsh j9p;.qtaare connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current-.apjshq; 9tj 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 dzz5lhvq61hhh b57)kojm 17t 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 cirkp ( is/o5mlisuvk9.o0hqd57 cuit, 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 powe30mr 3c.kswi mlv*yg 7r supply. In this circuit, the curren skcmw*g073iylv3r.m t

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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 (np pvuv:/ibhdlquuwga 35/6sn -3g )factor when the frequency il(3va3dgw )uq nib/sp/uh -:pv6 n5gu 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 volta*7e ufnpw)xc9 ge across an inductor is doubled, the inductive *)c 79nfuewpxreactance 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 AC voltage across an inductor approaches zero, the fgdrt w2(s)/ fxn4h) yinductivernf)wd 4xyg2)f/ h(s t reactance 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 conne*j6gbzon, g ayx-8 izi*sn-+ccted to an AC power supply. In this circuit, the curren nci-**+aozgb,n8yzs- i 6xjgt

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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 ctcy)k w*irj 0-ircuit changes by what factor when the frequency is triplw)j t- icyk0r*ed?

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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, txk)q ucii *t,- vc.6fghe capacitive reactanf gv-*. 6c)uk,t iqixcce 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 inductncfm4 b2,/c .tu aq(rlor and capacitor in a RLC serie./cmu(cn2t4b a,lr qf s circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is definnr,s )un/r + 2dfeguz3ed 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. Thn f5;jy9h k e9q01p;lo yao8aue impedance of the circuit increases if R increases. Whn09kqe8;y5l9jpau ;ao 1h y foen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The ig )r lvwbd6i rp1,x**lmpedance 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 circuit. Ttzdop2 8l:ui: he 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 tj2k;*yrf5*w r3rfot0bf7je h :i,ph jhe capacitance both double in an LRC series circuit, the resonant frequency3 r h* j*7b;05reo,h2i:pkf frf wjytj of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied uu1 k ir15*fipvoltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC x6laeg1 a; oh ;pwi:,0jpa8jfcircuit 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 ri2ou5)jvk+( + cibxio6whikq:rfu4vrvq8 +5 adius 0.10 m is rotating in a uniform magnetic field of 0.20 T) 6k+ fq5 +i q5ir i roi4bv8+uuhojx:vc(v2wk. Find the 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 is rota;/+km(wcefl kgya o.t7p 44 agting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane (a4.+ptco/;kwfme7 ylakg g4of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0tdlm5z07) f ts.20 T. Find the magnet570tf l)t mdszic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area ofvt e5 ogz/;y1v an adjustable 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 coil0 zv423sak2z-ej xemz/cm wu( 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 fram/o2nlq6feen f95y q7qe with sides 18 cm. A uniform magnetic field is applied perpendicular to t l2qe7nfyfnqq/ 9e 56ohe plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with vxn98ep9w g9 )hbu9 wf15 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 jj,k 0)d7gst rarea $0.20 \; m^{2}$ 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 fs pa7(yybk (*horizontally at a location where the downward compon7y (ypsaf (b*kent 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 2.0f:1y-/or -u(lbqu qp q m long rotates at a constant angular velocity of 2.0 rad/s about y ru (q1qf/qob-plu: -a vertical 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 genera 3zo5steyn2 7otor has 50 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 a1kq t8*t;z,w w:nxygb9ouk1 hrea $0.090 \; m^{2}$ 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. Eav hx0xm1tb 2sb64nd v2ch 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 vtxh02b m6v4xsb2n1d magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a52hou c6 htcr1 z5rbj2y 6mx;)oqmg e:rea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generaf18ooq p)j .nvhs*pk0+ ip h78lyg6yxtor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If qfs8y7o8ij gpnl*+01x6 hop )vk.hpy 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 witl+zuauxiy4 i1 s9hga vv:w3 -;qeo p;)h a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance 6 i9bee6ium rvu.y8a:x 4 do/)x sr,eoof 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 resist 4l2vg a:m(p*,b drqifk1 8l1ht1-xr:bzh jbb ance of 6.00 W. The motor operates on 120 V AC, and when running at f b2 l a*z -r jpt1:8ibb(gmk14,lbxfh1d:vrhq 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 4luh,6iky8+ ic4dv x uW is connected to a 24-V power supply. The operating current is 1.0 A. What i,i4xi8h6lu4cy +k udvs 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* ng6 ax4 yvg)p83d/7)npbp dep+pjrk. The operating current is 1.0 A at full spe*ap p+)dgyg/pvj e4pkd b38n6pnrx7) ed. 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-p)5wc; .4mb h,ogfbhm V power supply. The operating current is 1.0 A at full spee4m,ob hf;pwc5gm hb ).d. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage j3qwq -th.s1:ox(bvlof $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the sec;/f .f,/jd, zvfvlmanondary. How many tu, ,mjfn.f/v afl;/vzdrns 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 prima ):c f:, owj0gjazfu51nk7 qkary if the 24-V secondar:n5,goq)7f ju:awca1 k0fkjz y has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secon8fc,p+ vuw.oe*1i kn sdary coil. If.8uv1f c*ionw+eksp, the current in the secondary 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. Assuming 100% efficiency,*s*bd rf+ 5 uktc4n1lr how mar*d5su+k1*rtf b ncl 4ny 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 transfz /pul9 :y/pesormer provides 7500 V at 10.0 mA. The primary coil opel /zpp 9u/y:esrates 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 hl3alra) 2f 0gr 1l0jhtas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the 3)l2halgt0 1 lrjrfa0primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primarb3 7n3v(jv.ln w3vsdey coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the sev7vlev j. 3sbn(dnw 33condary?

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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 secovr944ykz)( uu pum * vjd 9nxh29dlto,ndary has 200 turns. If the 49uo ku) d y (j nd4zum*rpvlt,99v2hxinput current at the primary is 100 A, we can expect 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 transformer has 100 turns and its secondary hpyi) )-eh *qmpas 200 turns. If the input voly-mh)pi)pqe * tage to the primary is 100 V, we 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 t0ub2p l36 3fiss yq i9jy0m,iand its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the po09 3sbui 2p,i6yqs3 j0mfiylt wer 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 12d9cub: mamf17)p;tf7h / xn8zil zwy(0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the s ) 1d7bmumc(z 9w8anpiffyh;tz:lx /7econdary 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 usua0pc 5qge5 ya0nlly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 ea5nqp0ycg05W. 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 voltax evj+)3msff0l/fi2n ge 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 voltages )jm/vif2 nxfe +3f0l 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 lo 7)5t9o0oaqq cpnwq+wng has a total resistance of 0.60 W. A generator produces 100 V at aw )t790qp5cqo+qow n 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 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 tote ebzq7 b:wp;l)o15 ebal 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 percentage of the original e; 5:eb e )pqbe7olb1zwnergy 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. How4ag -qyosh/ 2f much less power would be lost if the power /sqhoy -2f a4gwere 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 transmitterlgg10 ;r)n;h;m eawq d on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the ormh;glw;)q0 1;re arn giginal 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 the pc0bp+j 8rhp0u:rww,coil's magp :hc8rjpw,0 w+r u0bpnetic 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 inductor. What is1ht,gf wb rs,. dt*:nko c,0xs this circuit's time const*w0:,tdkg,.c1bhxf r sso t, nant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltageqgqn-yq -t 0l1 is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currenv:d1x )s3-lwbdea6cw t?

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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 isr7/+ v. amxsrm2woy5yf;z , xh9rgw- u the resistance of the lamp?ymywu7rx 2 wr+x;so-r9zgv5 ./f,m h a

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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 conijh,,ezs3j- -lpx1s 2phi s*r nected to a 120-V ac power supply. What is the peak current through the resh --i1 el xi3jprphz2js,, *ssistor?

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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 aczoamx 0n0 nw--fe, yq- power supply. What is the power dissipoqwx-f,nz--n0 0y maeated 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 resistor:;yn/1lo dky l is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res/) aeupvv34ha.h as /iistor 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 reao0lig) 7 lei7sistor 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 1wf4cpc ixm)ulo3z x6wy8+ , cai8.f ainductor 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 reactanyov,f bjx80; cce 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-mH coil have 14.0 W of induct:sr c4rl iu:iq4ziknzo( +gj :i6m/,cive 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 indwnx)z : zy0lqc 1z9jq.uctive 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 whegbqpm-0og -:u wl axo5yg)/3un 120 V AC at a frequency of 20 kHz is applied touy3-)bwuogxm g-pogq /5a: 0 l 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 souj8t 1.5ozi+pfu -p ljhrce?

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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 9pzgx5 l+gkn; 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 rg ,1e0q iw7q yl eq;4qv zjl)+jco/rv3eactance 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 8uil6i(,+cnf j)vth3if. tvu-mF 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 rw25 q18z +hb)qf wl7;e-e+yhfuxex p xeactance of a 0.010-mF capacitor be 100 Wpxf;x2h)wu 5w8bel qe q7fyx+e- zh +1?

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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 0.0010-0. d- l 8nwycc0oog6a*u sv)ugmF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 Wh7hhktdo) 8-tu8 fk .r induct h8 t-8dhuk)r.k7 tfohive 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 imp4vo gk67b0hvdq* zk* nedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serb76h0nkdzv*k* v o4 qgies?

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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 coij raqol+mj/) 6vl mnk pxd*.w6s)c,s1 l, and 1.0-mF capacipa,nl) jxlow rk m 1vm6jdsq)+s.*6c/tor are 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 conn 2hjj3ec7l (qzected in series with a 20-mH inductor, what is the impedance at 1000 27hzjec(3qj lHz?

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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 series with a 20-mH inductor, what is the dinemy2 1.r6)at1kn p phase angl)1paidk62r t ynn .m1ee at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 2kl ul bsu(6;+t0-mH coil and 1.0-mF capacitor for a total impedance ofskt(+u;lu6 l b 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 seriest,9(ck h;ookk7 jb4gn with a 100-W resistor and 15-mH coil to get a totankt4,k(; 9j bchkg7o ol 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-kmf53bh.3b 7ok(h p ggmH inductor at 5000 Hz for a total impedance of 40000 g3k( .o k5hb7mb3fghpW?

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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 1e* urg f3:x+vp.0-MHz for a totaxpref :v*g+ u3l 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 witzu4s ru4(tn+a;c 4t9o xrfv 7sh a 20-mF capacitor. What is the impedanxrt4(sn tuv z9r4c +;7ouf4sace at 1000 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 ch wi 0ba)++lrwith a 10-mF capacitor at 1.0 kHz for a total impedaciw+bl a h)0+rnce 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 capacit2xyl+6.o:aa i; - 7pz q7qyezi;eqc lmor at 1.0 kHz for a phascpq; o 7qlxmlqe7+i6a-ze2.yia: z ;y e angle 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 jbbg. j fue-42f7sm5w in series with a 30-W resistor at 1.0 kHz for a total impedance off7jg 5wbsj4 fbe.2m-u 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the p3 ca9r8a /2lys8ck gvyhase 3lrc 8ysaya8vk/9g2c angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0il bd n:-i0evz s(yl)--mF capacitor are coil-(:vesd)i0nzb -yl nnected 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 consij3ink2 jvx/ 1k s(big8sts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circxn182vi/g k 3ji(kj bsuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an id5;;wuf 0h 7pdvy-d xekr8ib )nductor of ydike 7 r;vbdh )wxup;8-d0f5inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series :ppzvnvc 2,x- RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.2,zn vxpc:pv -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 500x4 pd* py(hth)w(wou 5g et6v-4b)gkn-W resistor for a phase angle of 5 bueg( h-)p(*wp)htwdo6v ntgkyx44 $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH,my d eb564p0ly C = 10.0 mF. At what frequency should the circuit be b60d4mylpey5 driven 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 output in an ac seri4y0w snz vk9 xc.xq)s9es circuit with 12.0 W resistance, 15.0 W inw n4xzq) 0skc.v99yxsductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an 03bcok b)* (zlmw6cgtAC circuit 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 a resimo8( cc+ fgonwsgl/yx6bt) ;+stance of 30 W. What is the poosb(wcg mt;clg x)6+8oy +f /nwer 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 cectfit3ce5,4s ng(a sl2 (hm*ontaining a 50-W resistor, a 1 t5f *tsl(hm n aecg4(s,23ice0-mF capacitor, and a 0.45-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 j mx k*yohk.3)i)en/ )/ltdcyfrequency of a 1.0-mF capacitor and a 15-mH coil in series?)k)jkmn/oce/hl y)di. 3xt*y

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant frulugu.m*wm0cz 5p/ 8q equency of 10 kHzl p u*mw8/cugm.5quz0?

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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 zig gnd2;1p6 ja resonant frequency26;ig p gznd1j 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 rjw;u;if 2w2xs0rx s6t7eb7 ytesistor and a 40-mH coil if they6727suftxj;; ebrt wi w2x0s resonant frequency of the circuit is to be 1000 Hz?

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