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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 ff8su b *hd4zr0dbgf70c7tm02j fxb7glux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thd- s5ra(vw1 zqo1ar0+2v ltlye $emf$ 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 whl 5 tn9)gxoj7* +ks(ateybgu1at kind of change on the )7ty*b5latg 1es(g+u9k o xnjinduced $emf$, 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 ;sg05 ekmjea87 qs0 woof wire produces what kind of change on the indw 5j0 8k7a;mqssgeoe0uced $emf$, 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 wim d 6eawx91.k d/uw,s :(vqukhre produces what kind of change on the indu k.(xdkw1mdh9uv a:es/6, uwq ced $emf$, 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 f196wu05c 2dodt yix8/ zcpld uield an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a co:nx,c*(;ey *cv,4nb f3qnd3etfgnou dmd:7 pnductor will be that which tends to produ 3f*c4c:vt:,3u*e m( n negnydxod7 n,pb;qfdce 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 horizontal table. A bar magnet is held above ityf+reo;x b2yabj:y c d;m m(vltoj oc 27*98q-s center wy2(cybx9 l8j;dc+ a-m7oqm:o oyjf;e *v2r b tith its 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 tabszw7c7z rcv/.le. A bar magnet is held above its center with its north pole poi.zwzc r7 7s/cvnting down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a r4bj7 fy2odehv5pj 2 o)egion 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 fie42vhj)ef5oj d2yp7 bold 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 regj hx+*8 pxue*c/evm 3oion where the magnetic field vector points straight u+hueo*3/8c * xvxpje mp. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a hori:ygk(.0 sa gcizontal table top in a region where the magnetic field points straight down. The magnetic field disasg(gikacy0 : .ppears 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 table awh 0 w9*duy4ctnd carries an ever-increasing current northward. Two coils of wire lie flat on t*w0thd wuy9 4che 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 loopk3f0sf8 l)odj of wire with the north pole entering first. As the north pole enters the wire, the infso3)fjkl0d 8duced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed yg(ls1fq( n d-m3c lz 9f2:jfda 83tztabout 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 rot: (3z atfgtsf9m ync8zd -llq2f13 (djation 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 angular spee/j0tkeccy* 3 tw-c*i md 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 myj t-*3cte*i ck c0/wthe 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 (cdrik ),g,k
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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 a6r w/rjdd*8otwk b2 t1cvsb ( 3-fda9+bfg do1n $emf$ 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 majurc36,1mdo ,5gxr hs;c r*v xgnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) cd;)k(lsi ly9 u9*u 06ahphs vis moved northward at constant velocivpy6 l )dus s*hc ;alh9uk(i90ty 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 constant zzuivv; u01s *,zyf9r 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 transfo4ip rchdh-i02rms

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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 604 ui/5*bdmll /i1 l:caxryqxnk,6w,x revolutions each second. The frequency of the yl/k:i,x6,lbwa m*1rx x4qlnc5i/d u$emf$ 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 to / u(etis9qki-

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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 devic9hdx1j5 :nu- 7qxcnffe 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 mvztdg 7 /b0q74;ucp a ou*tc1fore loops than the primary coil then it i po4zgcq71 vc0*/ ;7d uuatbfts 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 con: tpc yj+vi3n1ehqjk *l0 1g7ltains more loops than the secondary coil then 731cvknpl:h yjlgj ie0q1t+*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 ie u(xzy g;n.dhe g3p+/l(n3y onput

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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 circuit118wqx ff* h(v2ywl kk,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an*gcpt kxz) szai:3k *7 ideal battery of constant terminal voltage. At the moka: pk)zt gsz *x*37icment 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 cofvy7 kx:zx3*i4b oy e6fg77)suo /zpxnnected in series to an ideal battery of constant terminax7sxy p:7ykbx /f37ieo)v uzzgf *6o4l voltage. At the moment contact 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 kdf uayy+ x9:8R 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 and resistance R is connected to an u5 dojex-zu4 srsxehrm32 30- $emf$. 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 8 wi xty1hetldr77 f0c 2j,avhm;r-k* series to a battery. The time constant for the circuit represents the;7l txkf,dim ewj 70*-v81ah ytc hr2r time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in xp) po diqfr+dl*/8/g(8bx kdz7gvj, series to a battery. The battery is suddenly removed from the circuit.dx dp/pl 8/xbd,qg+r8*7k(z )jfogiv The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excep( lqttkzjqwp obs(u,7,:8 r4vhy c3f- t:

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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 Ahea u) g6c.s/ j upn) wrrb85vjq7;h(yC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cumj1jgv e8 nj9sq6d3 s/rrenn1jd6 svjg839/mqesj 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 cha377*:ekr+5mv r jncpnebp .ownges by what factor when the frequenc : mrpe *rnjkwv.eo+n57c7p3b y is 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 vts5m.pp :r h5)j4br bw7 l-ocAC voltage across an inductor is doubled, the inductive reactance of that inductorm4 5 so7wlp5vrtbrp ch -b.j):

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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 approachs n6bkt/; 4f d;5bzyak:3ux hdes zero, the inductive reactance of thfsa;5b4 z :ydutbdhx 3/k6;nk at 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 cira pt.1.j6 e5pl ld,yghcuit, the curre. 5 pdlht,jyl61 apeg.nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes z4nq71c8)u o4cfwc xh:fh/n b by what factor when the frequencyuo4 bhz48)h:x1cf/ 7nn cfcwq is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor q:2sem5ai yh16c m0uyapproaches zero, the capacitive reactance of that capis016 y2qyem:u5a mchacitor

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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 induct7o:l8q; 8 4vyv*cj e.jtdar pmor and capacitor in a RLC series circ. qpd4rjyc8;mj7ovt el:a v*8uit?

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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 d)yvoftf8m e *7efined 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 circui76 giapwk4pv q0jo vz30w6dp, k4ah n.t. The impedance of the circuit increases if R increases. When is this statement true?hi30v dop7 pa4wavp6 g.406q kwkn ,jz

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increfq ldp9zxs;j e) 4k8t).5epf7 ag6cuvases 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 impedam 2edskgaa 4v )14kh(zit+ h/ance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, thep7 o,p8rg :znvm:5fp g resonant frequency:o8g pmr:,7zfpp g 5vn 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 is8qj9ua :. tepq4g.kws driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuitquyit23 /4kku 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 rotat lp qitjov4yddkd+406c*es:o h.1p 6ying in a uniform magnetic field of 0.20 T. Find the magnetic flux through theq4jvh c6p6l*y de: spidyo4 o+ 1d0.tk 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 a uniform 6n27.mda tbqfdd1 ihi5m:r;dl4f ti ;magnetic field of 0.20 T. Find the magnetm.2tf1dm5 t:bin d;7;ih 6aqdfld4riic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20uh 3ae4 uus33b T. Find the magnetic flux throughe b4u3uhua33s 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 ofjl. fc96r+dc nin9uc/ 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 coil changes frons:e n 05hhz+nm $4.0 \times 10^{-5} \; Wb$ 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 2008obdjko ca1 n* v8s/l+ turns of wire on a square frame with sides 18 cm. A unicljno/8 *ov d+8skb 1aform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an aref2(+m tqc+u m1j -frcca 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 aph 7/u*zoagp. yw(k (bnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a an9t a (5fyv5;i2e+ewmsey1 wlocation where the doy+ tf ee2em95nia;5wsvy(1wa wnward 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 bar thighdm cz ply1//fm)+ /at is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnet/ym ) mg1phd+/z/ cfliic 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-sectiondbrjsp9 9 0lv8al 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 ofjp ,j.1b/huujtn +w+a o be0u- 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 $emf$.

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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. o2:0rkhqhtw l0 f;;xb8rl v6q 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 rotation, what will be the maximum ouro b h;lwv6qkf2q0l08 x;h: rttput 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 consist5x 7n*/g 27yftberefws of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish tb.sgxj,6m6m c mw88q fo construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. m6bjmc8gsmwq6x8, f. 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 ge*;r0oxoz+ v rxnerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistanckzi/ 2qwejf44e 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 motophpsr22l)x k4gh9fas 3)v t; vr operates on 120 V AC, and when running at full )a9gs 3)vr;lshvph k x22p 4ftspeed 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 pow 4nsv)map1 v6mer supply. The operating cu6sm4p mvan )v1rrent 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 resisb:vg- v nnq21mp2azf 5 rw)xa9tance 6.0 W is connected to a 24-V power supply. The 1 mvp2naq zfan2v)b-5g9r:xwoperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 mb 3ibo1n,.noW is connected to a 24-V power supply. The operatio .nb1nmo3, bing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformeraqn )m6 v+ra)lgf gxea8,3dm. 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 oz(f9 i:n) zqg9ifa,kmf a transformer causes 14 A to flow in the secondarkz9g)(mf,i: fa qn iz9y. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V pfiozz3g ik5q0 j-/b2y7r ogs0rimary if the 24-V secondary has 100g7/kzi fg 2o 030-qsy brijzo5 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 as5 z5y7rg h2ex 2000-turn secondary coil. hzey2x5rsg 5 7 If 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% efficienx,/e , lb9idh3y,lwbdz/4fbmcy, how many amps at 24 V can flow in the seconda3 bdl4leh ybz/b,/fx,d,i w9m ry?

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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 sigh.c8cq +pmap c p)ny.:n transformer provides 7500 V at 10.0 mA. The primary coil op .a cc .qnypc8h:+)ppmerates 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 300yd7d m3hyi:0kbt g8o0vrac6 u/smn(v m d;14z turns on its secondary coil. If 120 V at 2.0 c m3/k vm;ymvgh8 a10dyd tud6oi(b4zn7:0 sr A is applied to the primary, 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 primary coil and 300 turns oe v t q9h1bfks9p9:w1fd e6:amn its secondary coil. If 120 V 1fham6keqfvp:t9 : 1e9 sb9wdat 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sec1fyx ug/a qp bz)2h1q8ondary has 200 turns. If the input current at the primary is 100 A, we can expect qy1 1 q g8z/upbxh)2afthe 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 tur 86 ll9g6-smwq3 bt9g4/iakzy ;kx htins and its secondary has 200 turns. If the input voltage to the primary i -ttkgy 6l iz4whx9mki9bqs a/g6 38;ls 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 pox2i q+:j *px:*sdfe and its secondary has 200 turns. If the power input to the primary is 100 W, we can expp +xd2j x:s*:pfio*eqect 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 usually steppi7,rl +b 4hbaulzlap-9 kh:b+ ed 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 secondary if the primary +a +,4lbh kbalph9 lrzu: -b7ihas 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 usually stepped u1/dps0ec9 dq ygocfsb4 r4iyx2*sf(: p to 4500 V by a transformer and transmitted through a power line of total resistance 1.f0bg xp2fq(c1 ey4d4*id s/ yo:s r9sc0 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 curre fcra7ve c ftx*u3.x*1(ush g;nt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of u3.sx e7rhgv *tca*fx;u( 1 cftotal resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a totalog 2b 3/b*srs0pnych: 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 t rs by*cb32o0hn:sp/gurns 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 longuh06eb ppa zo90)mu0y has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to o 9mu )yae6bp uhp000zreduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the 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 powa u3nnk:c(6/ ;mf/b5a7uuq jyz9m hgh er would be lostu hj/: 3a7/hgz(;5fnc m6qmbuukn a9 y if the power were 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. 8j; r44zkb6yoztr(t v*c, *jbo9icp dIt is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer o;4r 86cojjb pdiv rtzbcy *49t(, z*kif 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 u kutivh*yht(+hyf.d/ms( o9 v.)5bzstored in the coil's magnetivtzyuho . 9(ihs d*uv5kft(hm .+b)/yc 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.-n0fomw f e9+l What is this ciol f0e9mnf- +wrcuit'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 voltag;dci;8ulws7 ev h43 kke in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Whatj hr7g f )aqaqf;8m:8,lkby)d 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 xo; g+h /glf .d1novvui ;pn9+a 120-V AC outlet. What is the resistance of the lamp? +xfn1/ioho. pnu9vgl;+g;vd

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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 yj:by (ys4e7/qsj,fn; qs jz2-V ac power supply. What is the peak current through the resisb:z2 ,;y sy(qfqenjs7/4 j sjytor?

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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 12pixb:h2p4 x8t0-V ac power supply. What is the power diss x4xpht: 82ipbipated 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 is c5 djo259oum3h rm*p/r6w tm2,qoiza $I = 0.80 \sin (240 t)$. 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 resisto;gw9 m5uy:/7yvw qjfbr 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.o4grc yxp m2+e4rlg+pzty)8 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH.t 6(c.)8ffxt k+o ,xmuw qsdt 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 nd ny8yz8-azv 1f3 5 zb7d:bbkof 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 he,x*4xnk rdu- k3yok4/fbr 1cave 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 t51ap40j8ag *mj jc1pyq cten2cv6 j*W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 Vxgt aizi 34,8rabs :fe37iv6c AC at a frequency of 20 kHz is applied i3 bvz,axg3 s 8ctfri476 iea: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 semnthh m7d;2 v i0,unzw. l,.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 a:lkxecq1q kcc(r;0d**w ,m2hk qi;myt 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 0 7vdr*y w d+z4dl8i hotaz6m8have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 120ytz / mvf,xocd,(h tc/ h16y,up8w;z n0 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 capjw:d l m*-a-h1tftjf :i67dnjacitor be 100 W ddlnwt:f ja-jh1 6- t:ji7m*f?

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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 e , bfl 1v/x84rx.s3rexbqn.gand 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 r,m:l5pn,be rg esistance, 15.0 W inductive reacl ,,egn5r:pmb tance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a h iq),ki gki *.an 2g-z7o02zxzomnp +100-W resistor, 20-mH coil, and 1.0-mF capacitor ar-iq z2n0 o*2h,kka. )+7niggzozp imxe 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 at 11n;qr lim,dir1 kvyl* y8o94i500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connel1,k4m8ir l v1 ;dqi*yoiy9nrcted 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 connected in series with a 20-mH inductor, wha4 y u6:ssgo; ;nuragq)t is the impedance at 1000 4;s) n6oyuugaqr: ; gsHz?

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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 3qddj8*x ,z1lq m ht5win series with a 20-mH inductor, what is the phaselhz dq*1 ,qmxj83d w5t 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 circuit with a 20-mH coil and 1.0crt: fvkd2 w+l* 7994ne wxjxf-mF capacitorfrc:k+tvl*w94fd n7 j2 wx e9x for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitg1c t h98vu9 qfi utwy87f+6xnances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 19 yn6qtvhtgc 8w7f8 ux9+fu1i10 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 wizsbg1ekmj cy7 .qsv0 06ji a2*th a 450-mH inductor at 5000 Hz for a totkgimbevqj 6z00.j*s as 7c 21yal impedance 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 (e*hp9awci* o1.0-MHz for a total imp*wcao( h i9ep*edance 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 20q 0t.5p7g-l d ,xo, gpsro)(wmpq ans.-mF capacitor. What is the imped),(t pd g,oqlxog.p.70 w-ns5 qarpms ance 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 with a 10-mF capacitnl4n o/qs-vm,pcm4/ l or at 1.0 kHz for a total impedance of lc4p/vmns- m ,onl/4 q45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a php8 uoaw 2)huf0ase angle wu2a8ohf)pu0of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is tz0*8xx n1f9etevqqvy;1 cp *needed in series with a 30-W resistor at 1.0 kHz for a total impeda*cq f10znptq9xev 1*; vy 8xetnce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Whavk 7uigvp pbslcf(qgs1583 .( t is the phase an g7gv(q3pv(pfs i bs.5lc u1k8gle?

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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 15004z4cmt bkym1xa nbq99n(6y8q Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaa9xn( z4nqyy kbm8t4cbm16q 9 citor 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 oxs9,6d g)femv f a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cie fsxm )gv,69drcuit?

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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 inductov;15upqfp.r5fs lfz6r of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power6v5plff5rpus; z1.q f source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-xuai )ryjg9 7of/6 uu e1f//byW resistor, a 10-mF capacitor, and a 0.45-H inductor, when1/bruoy)u/ u 7g9fxyj6 i/aef 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 for a phase angle potl56dv1mgg 7 : pvw(ofm(tv5pd7l1 6w gvo:p g $40^{\circ}$ 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, Lhgp(.wwv;yr1ot , 0 wl = 200-mH, C = 10.0 mF. At what frequency should the circui; w v1gtl(y,p.owhrw0 t be 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 in5-(,zvs nbepu an ac series circuit with 12.0 W resistance, 15.0 W inductive react( -p s5bveznu,ance, 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 AC circuit gs3i; 23 h7plm0 qwfoais $63^{\circ}$. 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 resistance of 30 W. What is3-j pb;k np+s;aql 3xph4udk6 the power j; q33pphnxls k;4d6pkbu + a-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 ry g 3*ocq(pvaf4b87mcontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducto r4 y3a(bvm*pqfc87 gor, 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 cq s 740:*xa 8tda9,z ael/fue ahuvt3zoil in series?:0xh3d9leazaau4v u atqsez 8,f *7 t/

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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 fr0 :lyh*wzaq2b( g i2bqv sqv/6equency of 10 kHz?(qz w0i2al* :qvhvs2g b6yqb/

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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 resonant f1bno *l r, yznusl*e-/rr dgz-0eaf39 requglennf burz*/rol -z s,31y-ae9rd0* ency 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 musp,j: w :bbtid6t be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to ::tiw 6dbp j,bbe 1000 Hz?

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