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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 magneticah3k9f4vy1a y flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that b+ 5s8a0 agpo8ty0l dxywapdq15- tr5the $emf$ 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 chaokp7mkeg 9d*f:syx9+q7* r n knge on tky*g q7n9 *kmerfo +sp: xd79khe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire jyd3 *sczzyly0.s1**jz, l59i a epxfproduces what kinds5fedz *py*x lzszy13*i yaj9jc .l,0 of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on th-l( t o c0n,ij(mhkru-e induh,oijtc( uk lr-0-n m(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 fieldb+ 78jbrv v7yc 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 a0q00ljum f di35ink8 an induced current in a conductor will be that which tends tnku 3ija8050fdlqm i 0o produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abq p6gzdow 9(s)ove its center with its north pole pointing down. The stationary magnet induces (when viewed from6o ()gs9zwpd q above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovebbeu1 glhsyq.e:- v4v9 (ud fku,8og: its center with its north pole pointing down, and .vh yufkeo sq:dgvl8,g (4 ub9:- eub1released. 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 region where the magnetic field vectoi- o9 idr pqyb*.kz45rr 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 fdk y4o q5-p*i.br9z riield 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 wherb0 es.w1a nk oby4a:1vum,4 jae the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increa jneymswb,4ak11 a.4o:bav0u ses?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a rego.pxcsq0df 5a m. r+0wion 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 tsr+ owf.cd0 05.apmxqhis 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 a5ra;mofs * ln1 horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced cuor5lf*1an s;mrrent circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering firskig7*yb: jhfd94vw3 wr ry t:(t. As the north pol rwhvykib4 y :dtj7g3*9r(:fwe 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 angular speed about an axis 1u3/:e aklntl whose direction can be varied. /ltu3ne1: l ak 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 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 cons3ea 0dw 6xke t4e 0)vvkg-*fpvtant angular speed about an axis whose direction can be varied. In a regio0kev3 fx vg-)w6e4 atedkp 0*vn 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.y*b0 em*fx fc6
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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 an eidx/p ii462 ndw3s8w $emf$ 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 aiov;0wzm yc8,71 w9 npeu4dln krx /m: magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northw b0s2 bsich 2-;cou sv8z**ynxard at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across u*sx 0 zbn8io sbcyc*-2h;v s2the 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 conyy1d a,,jwbbc )0 (jhply,x)t stant 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 t.;- zxdr/a2 5 m aea.qu+mbjerransforms

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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 throug wi2l 8wxwg-r8anfk1 +h 60 revolutions each second. The frequency of the 8r2wiafxl1kgw-w8+n $emf$ 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 tx 5ac,sw u3t (wut(q0i*d,tgfo

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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 de2 lan/i fu7v)ovice 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 secondare /rgzu1.zv4 t ke-.yl:2als dy coil contains more loops than the primary coil thegr v.e/ .-1l4zzdakt eusl: 2yn 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 cont+i--7eprjn* rkv* mcs(f 4y0b -aoeixains more loops than the secondary coil then it( or4kr+ifv x-cabm 7*ns-e0*ei yp -j 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, thgx4 m; lupgxz uan+i q/0,3t8ke 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 circu7 gt0q- zko2teit,

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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 ideal battery of cumh/s1 c9i7dyq zn, )b qs2me6onstant terminal voltage. At the moment contact is made with the battery, the voltage uhsyqq d6)emi 19,nm27szbc/ across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batte;7(wxjesfben)m uc;( ry of constant terminal voltage. At the moment contact isjmbx;(wu)e 7ne cf(;s 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 c5r.cq i h3sxotndl,ei - 24:vresistance 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 and resistance R is connech5 v,qsc3emk2ted 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 tim3kw jzzjz48c s* pq(j4e constant forj4pwcj8 (4 qj* 3kzzzs 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 are connected in series to a battery. Ther -cl*- 1a*qhgqdq(iu battery is sudq1-c*g i(-rdl q qha*udenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the followingzd33 wbm+2e qqq/p rw rfslyh 972:ju7 e0:vxw have the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connect0f vb8zw kek 50cyl;2wed to an AC 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 :r) tek+q l x8b:qn:hwcurrent8b:nhq k wtrxq:e+:)l

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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 fabbe.l iapi6/+bi 3c0,lm,yc sctor when the frequency issy0i b+m,.,3ci/plebl ab 6 ic tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is q2lcvr*i ,h4c. j/cg bdoubled, the inductive reactance of that indug .cv 4c qi*r/2j,chblctor

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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 voiw 2v 1ck:djc2:woy jl j*vd88ltage across an inductor approaches zero, the inductive yw: wv8lid2 jccv1dj 2 k:8oj*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 connectedeu b*gxg* :q8rr: zjz- to an AC power supply. In this circuit, the curren :*u:ex- z*ggr8rzq jbt

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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 factor when the fre7gbg tjo*ey3* a.5q:7qq6 oy yowsxd,quency xj:t bwyq5dg y*y,o77.o q*oeags36 q 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 volts okp2u9v ma* c1y)p)kage across a capacitor approaches zero, the capacitive reactance of thatc1pksv oa2) k*py)9um capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a f1 rv18lun ;/ohh-f1v,idj vb Rf1vh /h ou1idj,-l v;b1 rn8vfLC 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 RLC circ81vhh3n vvp3+fjbo (luit 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 ts)a /e mlybxo mj.3,duqk 324i),q(mhhmov +xhe circuit increases if R increases. jam uhm3d)(vm.k 4)ys xqb+e oxhiml2 ,/ q3,o When 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 impedance of th5 tt krzdflqdm-4o5nc).9hb .e 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 circuit increases y lp7hsd0n)+fif $X_C$ 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 2 my- qpvb3(/uun9 frjl9a.fhseries circuit, the resonant frequency of that circuit wil 9jb/p9u(f rulh 3nf m.yv-a2ql

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit7hzvzfow 4/duc4)cu pr)1 )nw that is 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 cubl,yxm 6 (k tj8y92lyircuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic+s )e v8vphhmm+ vqw:e 0;,+ue ozz6fq field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and e8mfp0mqu :o eqh,h++zve)vs+6wvz ; 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 maguk8d(ttnva08 q79 t hhnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field (htvnt tquhd 7ka9880vector 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 0.10whk9gho66 q 4s m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wheng4hko 66wq9 sh 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 t5ig20txrr,f 04ax qw of 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 fr iq 0/tmlorh70om $4.0 \times 10^{-5} \; Wb$ 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 tu-w 0pej3ei x .4i;l ypd):q-bra ev/lprns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes ureiiwy:pjd)0; apqlxe /.e pb4 l-3v -niformly 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 witr0vjw0l5mdb* -fczs8 h 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and:kjf io 5:fzw2 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 wins:bsi-2 /*njt2 sfuvng span of 60 m flies horizontally at a location where the downward component os n tnfb/*i:2s-vjs 2uf the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a o)7x z3aho4v2qon dz9constant angular velocity of 2.0 rad/s ab9v47 hoz2 oanq3x )zdoout 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 generator has 50 loopojw);ok)h*++ tdaedr s 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 100rr 8fh/;d siu2 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. Each loop is 12 cm lx67ak mk9 i81qfddp3 p y/pj-gong and 8 cm wide. The armature rotates at 1200 rpm abo - 1xp97 kd86pp /3afmqkjgiydut an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of 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 area(fj+ z ,hw9z+iligi y5 $0.090 \; m^{2}$ 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 generator with an output of fnbh;/2ab a +yuc ) zbg4z/q)z12 V maximunz)ugf ) b/2bab c+h; q4zy/azm 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 mkb h z8+3vwmw3u y/1ojaximum $emf$ 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 motor om x;q3 (zi: fnot:vz*iperates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates onr) 5hufx 4l1gk;iwm/w 120 V AC, and when runni14f hliw;)x w5r/ kmgung at full 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 resis9co:wtlss2qvtvs5)pw*e ) . etance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is 2l59t swest*cvs q )w:).vpeothe 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 sg r +f*6 m sx kgi5ly1qn1wuh8ov3+q6W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What 15qi6 vg+ngo1 y3 xlf6smqrkh+uw*s8 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 res/ hu (wxdrk4)vistance 6.0 W is connected to a 24-V power supply. The op)/vd(u krx4 wherating 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 transformer is needed to ream.x 9icpwe 7.duce 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 prx0aj +,pzgjgv76nr 2d2os :a jimary of a transformer causes 14 A to flow in the secondary. How ma7 pj26 o 0zg2vgn+d,jjs:r axany 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 7 n9 :99 tirtuqpia-lhprimary if the 24-V se: qu9i9htp7lr-tan i9condary 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 20* 9zsfs5*0gdgs3g idig/x8 osujm/r)p4ej4 w 00-turn secondary coil. *sm4pw4*)d rjizx 38 sg seogg0d/sig 9u5j/f 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. Aswpk51 cleddf;w02 j9m suming 100% efficiency, how many amps at 24 V d21ke0 9;cwf mp5jwld 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 transformer pr4epue 1lox) (.q7bp+b .danub ovides 7500 V at 10.0 mA. The primary coil ope.b 17uo( pup+bdb)nleax 4e .qrates 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 primak8zujcs y;ay5) yvo/gu3msp07x ae;5ry coil and 300 turns on its secondary coil. If 120 V3svyo 5u5/ e0kay;8m ap zj;su )gcyx7 at 2.0 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 turr .zsgd2xj vmj qc9u)p,fth u;.(:ss6ns on its secondary coil. If 120 V at 2.0 A is applied to the 9vu 6dj2cfrzm..js,sp;gq tx (s):h uprimary, 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 secondary has 200 turns.m pd:gi my7f55 If the input current at the primary is 100 A, we can expect the output curryi p5d7f :gm5ment 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 has 200 tuo)j/f9o:jf+; ipdgzy rns. If the input voltage to the primary is 100 V, we can expect the outpu):gfdj; y9f p+ /jizoot 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 turnwbb/l6 l6 vjuv. h*8pl* (ximxs and its secondary has 200 turns. If the power input t 86l*xm bij ullw/vv6b *hxp.(o the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuallybyouu-u3 46lh 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 secondary if the primary has 200 turns6hoy3 uu-4b lu.

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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 o an.v; pi f5qzr1n0cs*f current at 120 V. The voltage is usually stepped up to 4500 V by a tra n1s5npr iqc0afzv*. ;nsformer 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 voltage is lxde-(d tz8;v *m2 n-emfrs)iusually 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 *xzr-(mns )dme-df; it2lv8 etransmission 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 t:nibakviecftc 93ta y: k+ q+a:1ah-5 otal 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 energy would be loba9t -:te hni3 a+:qi5fyk1 ac ca:vk+st 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 resistancrz/pl.o: r3si e of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmiss.srp /lir: zo3ion 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 mm nucfg0 t6o2,uch less power would be lost if the power were transmitted at 3000 V instead of at 10fg n2u6 otmc0,00 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 ox ga(0-jf/q)qko to,be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transfotqkoo0), g(a jqf-xo/rmer 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 curbp ;-z3cd v7oprent of 5.0 A. How much energy is stored in the coil's magdc73- zp bvo;pnetic 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. Wfy3aglm4 b. b:-bmjg7 hat is this cim:m agbbl43b g7jf. -yrcuit'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 Affqy8cq )(c2j C 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. What is the peak o*6w9 p9tp;j ay tf/rocurrent?

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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 the resistancaq32 //z oor5sj51i n*03nfmrwnrrym e of the lamrno1wrmy/mrr /o 0 ijn3a 53qn2z*s5f p?

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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 conb q9)o-mwtqh.f1x3k7 g 9n ,ko 1atkwlnected to a 120-V ac power supply. What is the peak current th t)q 9oa.17q9bg wtoh1nkkk xfw3,- lmrough 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 2 q(+rmec -fcbto a 120-V ac power supply. What is the power dissipated in cer( -m2f bq+cthe 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 resi5j2m xpa2x3ixstor 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 resis y 7 1ngw1ytvq(p-w(cetor 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 resistor z5wi65,tyzmxba0m 9;o dvkg/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 inducto,bhtj2sb5arl/z/ z be.;z+7o 5 os vicr 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- 6yqd6e* f p,6cbsa4/2e kppdrmH 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 hav5mmj44du*h ale 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10mz3su:)rmj wemm 5ynf)5 fh m ,lc849i00 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frrxi(2la sd -5e8 yksyv6pur 11equency of 20 kHz is app kdar6(-svrpsyu 1x i2 el58y1lied 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 throughk9 - jto-m;:l+z* gmxiq;tb kj a 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 reacta;d r-+s*3gxkxdz44-hig6)huzp cyw f ga8e8a nce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance athv34e) vmy bke:.qs- c 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 c0fyw bm,*ss0ri u2i2x-a9ynvapacitor 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 reactjuqt ,j h;gs50ance of a 0.010-mF capacitor be 100 W?5q0jjts,; uhg

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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,dn.cp jer( *n;oi, ql 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 oawm9;m;pc sq obp3g8 )*1ydban ac series circuit with 12.0 W resistance, 15.0 W indudambw9)8y o ps c;g*qo bm31;pctive 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 impedancy8*h 2 .rle+gs,oj-je3k fv9z i) lqwce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitoj+ 3e lwvy8 r*h92el.kcos,izq-gfj) r are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resrymu d0qi*ohs8.u68 ristor, 20-mH coil, and 1.0-mF capacitu680iq hdm .orru8ys*or 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 connected in series with a t pffx-9y -(a7ezc:hl03ukp g20-mH inductor, what is the impedance a9 7p xu hk( -:eapc0lzyfgft3-t 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 iysv o+/ob.4hdc9 xc)un series with a 20-mH inductor, what is the p vs4h 9/.yx+c)uobco dhase 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 aftt ,o c5n lfid/3m,j)mhoq29 20-mH coil and 1.0-mF capacitor for a total impedance of 100/c,nl food)jht9 5mtf mq,2i3 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 capac8 fdo-ly9 xbd(itances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 20009b (fo-ddl8y x Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5/qp+tcjd 0*bl000 Hz for a total impedanceqj0 t/cpl*d+b 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 for a tr2 / 8m wsbkr j3cp+ up .y-qyri0z+js2e1)splotal 2c+y.qezm0j s sr23/p -jw us8p r)ib+1plkry 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. Whki5g/r qx- ot2at is the impedance qki/t5o -r g2xat 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-f wx.o4o rk h6*uo- ):az4gqnkmF capacitor at 1.0 kHz for a total impedanc-q*on o:kk.6frxo4 wh )4zauge 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 capac ebioa,k. h)g7itor at 1.0 kHz for a phase o,bagh. 7eki)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 in series with a 35ebtqhvge)- + 0-W resistor at 1.0 kHz for a total impeda-bgt5e )+hevq nce 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 14b34 cwpu4a yqi:k2w h00-mF capacitor at 120 Hz. What is the phawabk4c : uw4p2iqy43hse 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 150g4hx t-cyp52ca3l/cb 0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?byc5p 243 taxcl-hgc/

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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 resistfuwv1 wrs3cm4 f)*vh* or, 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 r4v rh fwc*vmfus3*w)1ms 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 / +4gramv71 eijiim8py;i cu -capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source.m+4yig m-iau/ 1i ;7evi p8jrc 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 cirkhe6bj1onvk n /e5 d7;w,eb k0cuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hnvkoe1d0ee,6hb kb/ 7jn5w;k z 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 wit4 f3hm/nkj oz+h a 500-W resistor for a phase angle oo+3n h/k zm4fjf $40^{\circ}$ 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, C = 10.0 mF. At what freq+i3cg0rq -uu wuency should the circuit be driven in order to have maximum power transferred from theur30+wu -qg ic 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 circuit with 12.0 W resistx2xn kcp.w3) sance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power nk x32)csw.px 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 cirulpl yjytu g8089gr, (z6i-gbcuit 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 resistance of 30*paf6; rsr6bo W. What is the poa6s6 pror; f*bwer 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 contaa0 r3he omjq6(ining a 50-W resistor, a 10-mF capacitor, anoqaj6em h0r3( d 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 frequency of a 1.0-mF capacitor and a 15-mH coil in seq sz1d*fphmm00xq)l )ries?)*pq dfxqhls0m1z 0)m

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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 c2rc0 z p2+p (3lpvamclapacitor for a resonant frequency of 10 kHzp(z +2c3apm llv2 0crp?

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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 resonantsf5,evc-ce.;x45ry vsrv+ ho frequene,55 4vs sr+crv- exo .c;vyfhcy 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 mdc 7zm.bsp9j9w9w5jex 8fte. ust be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 e8.c. e mpzw79stj59w b9djfx Hz?

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