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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 s(c+to fr80 dxare units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inducpeywils*v*tx/ere-6 + fsf* 2tion 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 7ehpc fchyn13o7o. vcvl ltjm gn)s/ 4r/. p:+loops of wire in a coil produces what kind of change on ty+1 nmt4f.jhvc: 3n7 or)./g/lh pe7locps vche 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 wiil dgr. nxj)mz8cb, 70re produces what kind ofm )lnczd0b87i,gx r j. 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 ojgo -a+n2dng9f a loop of wire produces what kind of change on the indugnn9gdj+o -2a 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 0t-*dtxpi ukp9 f72ff:+ mxme a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the directi6ckjznbmmsu)153 ha3bm x)ga+1 ug2 ron of an induced current in a conductor will be that which1nrzck2ub5 sh um)+m3 1aaxg)b j6g3m tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal taby0vy9c)lt1, 7k0tdn4 by8fy*fq w/n ipyiwr7le. A bar magnet is held above its center wiqw84 tcl709w7vy0yd1pk ny) b *yfitiy,nf/rth 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 v dar25:doc tat/)l(ka horizontal table. A bar magnet is held above its center with its north pole pointing down, and releasedlar5vd toktc2d/) :a(. 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 wo-*,u +qiu pwdwt )ap9here the magnetic field vector pointuup* iwp )9d,-wa +tqos straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field 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 magnetic field veckm6,9b) bmd *nt9ca:g4sdky g tor 4:9,mbcak9k y*m6) ddsggnbt 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 increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region whc 2v05/tae/xp v,pjgq ere the magnetic field points straight down. The magnetic field disappears suddenly. Whenpe0a5cxj gvvpt2/q ,/ 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 and carries an ever-7wz+a.t ih;a6cza 9 9f3nrih xincreasing current northward. Two coils of wire lie flat on the table, one on either side of thx79z 6 ii .cnr3hhat9zaf+ aw;e 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 the62 uruzhba,g -h3 eer6 north pole entering first. As the north pole enters the wire, tzh 3ru-bu h26eera ,6ghe 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 rotanftisg;k y,-q:at;c 7 (g hyc5ted at constant angular speed about an axis whose direction can be varied. In a ha sn-ytfg(: gcq;;i,c5k7tyregion 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 constant angular speed about an axis l5 0jqxgycmy04vqd9* 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 rotation if t dyy4xjg50q*cq 9l0vmhe 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.g 4:vej:zarlg; q0v8x/h x* e :hxup,g
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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 usgk2, 97v ;( rhxg44jwtx3 hvryer- n$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field st95:r/wspj*mnr : kb. 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 moved46 n-iou;ly iy northward at constant velocity through a magnetic field thati-yn;u lo46i y 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 rotatesfp/m,8 njtorfb o4t9); l+ lgi at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trn lg n3c;xe )4 w3jpblxe4 ;vpl1mss73ansforms

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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 6vj2xjn uxl(j-q xt o(3,oqd3h3x.mb60 revolutions each second. The frequency of the 3x(h qtj3-vl,2(6bxq.m3on jxjd oxu $emf$ 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 usulem )pl9 x7- /qqf+ ) 9tmfvd;p(liiled to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devir/,ymu yt ,. g1d(qmgkce 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 seconylo(d r(t(l2d dary coil contains more loops than the primary coil then it i(ldr2 lod(t (ys a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains mobbkjs,+c/cby9o py n9;ckvv32eh z48 re loops than the secondary coil thc/s4bcj9n3 ve9,bv +yhbcy 8kop;zk2en 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, th. i5j kdnd*5w )7+ouix gz6uane 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 resonanheld-py6/8m4v .,p f:p l7oe oyp5idit circuit,

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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 se-auaqe9lgj to or-us0)0f,:eeir;( uries to an ideal battery of constant terminal voltageio j-;u,- q 0eaarseo)(t:g0u9luefr. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are conneir6or62h+ gsxtk u,5 mcted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acro6g2t hkr s5x6urio,+ mss 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 dv-+/v7ks dh kv xsk+9L 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 andff,f58h1) n )(vv aum*ycun9 kmvx (rk 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-n.qo p p*q*qh battery. The time constant qo*nhp-*q p.qfor 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 batteruikoc yy;*4ncivw6/t*.c 2ery. The battery is suddenly removed from the k iwunyoyc*. t;vi24*cr/e c6circuit. 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 ukc+a..1 vod v/4fiih over3e 8nits 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.p+nokhi 7h4;g 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. Iq 2 ojaxhc)10q*tszo;mm3cs. n this circuit, the currentojas *0hc)msz oq;2. qct x1m3

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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 factor whe5(8suu6vkrb+ jgc3avy;jj nv ;i/qu9n the frequency is/6v (yau ;5k8jg9j+v v3qjibs;cunru 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/ibj5 km6l:te is doubled, the inductive reactanctjimeb5 k 6:l/e 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 approachesw6j vv4(:vsg2b vxz +iz. hnt/ zero, the inductive reactance of that /s jvi2 z:vbg64+hxz(ntw.vv 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 a,,7)t d emdhke-bp .8 4afbxkrn AC power supply. In this circuit, the curren- ) fxr4d edthm7,bb.8k,ekapt

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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 1cngkfx*fi8 tq.t n d0vjv7*(the frequency is triplejt7*8g1f nictxq0ndk*.( vvfd?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the b.j wpj46x;0u lpsx. scapacitive0l. 4 s wsbx.jxjp;p6u reactance 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 induct7ts,gsvo ts,- +v5ji qor and capacitor in a RLC sersioj, tg5vt7sv, qs-+ies 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 cira; tqr8f09q gpdwky-; cuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit:u ,p7n e+p kiqcgzk 6+k1/sqj increases if R increases. When is this statement tpz k/:pg7c1q+kkijse+6, unqrue?

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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 gitm zk/4fxy.3-, jy * /msaicthe 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 impedanc6t g643acdfvs e 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 d-fbyy)f 0wqj- ouble in an LRC series circuit, the resojf)w- fqb -yy0nant frequency 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 voltage. At resonakrivwq72xwgo-s ek) ( 7g, 3ennce,

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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 R -zmh/ )olpg/rLC circuit 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 7tspip tym0:x/ y,nt7a uniform magnetic field of 0.20 T. Find the magnetic flux throughtym,xt/:7sp0n7iy pt 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 rnwfku(j2bi-a9xgeg0 /wpt(o2 3 ynt) adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane t p(e3n2t2oyixj u0) kn/9gw-af (gwbof 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. tos ywqmwi 63 ,k5nvd3-x0riv-x,ur is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thev- doq -v3iwu3imrx rntxy.06,5s , kw 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 ar xj3h3cv ,6le km/g-n2jc w0rjea 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)kxx:b6tb)s7 * fxjvhalon /2om $4.0 \times 10^{-5} \; Wb$ 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 ofql47esfoo4bo sp.4 9f 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 chanpf sq7oe4lo.f4 9obs4ges 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 ts*t lkghlhi4arsp;q9y1o+0 ij-36 t purns 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 a8vr ngt9 85yhu mu96yand 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 horizojapty re;j 17,ntally at a location where the downward component of the Earth's magnetic field r,t;yp ea71jjis $6.0 \times 10^{-5} \; T$. 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 r)k, gc rlx+qg0otates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its en)gx ,rc+lq gk0ds 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 hasb2z rcnob x::u)w:tq4:uc -ss 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 ofi:0plcie 0h1aw s0 2zf7w7lp/kzc/ wi 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 ,p 2z 5str2mzf4z6ecd loops on its armature. Each loop is 12 cm long and s6z 52 m2pr4tczdzfe ,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 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 consist 1 34fo/o6ujaadx+k hbs 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 to construct a simple AC generator wit;uu8k*e wxbz /h an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rota* 8zwxuk;b ue/ting 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 generoc3cg7d; hmr x65 jqx+ator 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 resistance heded*wf4 ;3;tf6nfb 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 have4zk:xur *n6(jx k:tj)apc e:v a resistance of 6.00 W. The motor operates on 1nc :pk6x juez(tx:) k*j: avr420 V AC, and when running 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 resistance 6.0 W is connected to a 24-Vbizefh2c974 p zh*sl+ power supply. The operating current is 1.0 A. What is the starz7lfceih4h+ ps b*2z9 t-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 internq1*ou y 7be a*odamfr-r8j b62oox 0,wal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0mobr a w 6od *2r7eax u,o*-oyf8bj0q1 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2e:f.5ep5 vxz ;j.dbso 4-V power supply. The operating current is 1.0 A at full speed. What is :b.v.;ej x spedzo5f5the 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 rbw idvvmwux fu93e * :0,rv58feduce 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 pr-kt+wc ml4: nxb+ s:n1jmkp .kimary of a transformer causes 14 A to flow in the secondary. How many turns are in the secondary-:4xmkmjb+ n:k np1c .kt +swl?

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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 /w sdt r0skq(/ti.1 -z ,prciware necessary in a 110-V primary if the 24-V secondary ha irpdrs/-cws z0/ .q1,ikt(wts 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 ani) 3b(nurtx 64f,vy* tnicp j)d a 2000-turn secondary coil. cn vtn,b6) i(u3 rit) xpj4f*yIf 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% efficieni ca45zgnwyaxm(.p* 1 cy, how many amps at 24 V can fl .wi xzac1*gny5p4( maow 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 provides 7500 V0orurt jqoot19n.0c 6c n ;do5 at 10.0 mA. The primary coil operates on 120 V. Wha.ort0 j d5n6o;ooctn qc0u19rt 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 ha 8 vi:0v qitnxw:o8urp.iq4k4xb y3* ls 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secqt iky*:xvq.0p w ni:8lo3ib84ru4vxondary?

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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 zp +9 sral2ob3wo)rj 4va1 v*gprimary coil and 300 turns on its secon)oabw4lzr+ ro* s 9p123 vjvagdary coil. If 120 V at 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 trant9wg5uk4s6)i . yi5b;feg l vfsformer has 100 turns and its secondary has 200 turns. If the input current at the primary i gklt5e5. fgis b ;)uv6yf4iw9s 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 / peg5 jh;fd:(v*2wyifx cyo.its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to p:ohw.xf 5ji; 2(yv*gcfyd e /be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has svb( (a5an j2ouk g7(f200 turns. If the power input to the primary is(o5(27 jb fnguas va(k 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. o1hs)lslh0my ,gtlp09x ia)9d-(vl n 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 ih- tnm9ll lpldvyh)s9as( 0,10ox )ign the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces653 snlhke3t1xw *rds 60 A of current at 120 V. The voltage is usually stepped up 3kr5dtnhwx3le1s*s6to 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.

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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 gc9ao*,fde fd42y;bh2 3acbuis 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 vol,fc*b9gd;b4 o2 e af23dhauy ctage 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 totau pc 3ff4/lk1e stu xzf//k2f*l 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 w//ue3f2flkzpx uc*s4 k f1ft/ ith a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total re91/*xuy cndx:pl4kvr sistance 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 is lok9x4u1 yrl*:c n vdpx/st when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How muci8+ 9;ydoewg ah less power would be lost if the pow+y8d 9ewi aog;er 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. It is to -b9f )i5bsjrr be transmitted on a line wi 5- jibf)9rrsbth 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 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*+0r dx s) yyzbgrcw1*-ff1bA. How much energy is stored in the coil's magnetic fiecz *y s-a*b1 +b1w)ry fdgrx0fld?

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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 containsamti33 v 7s6b3hyjfvshj+;t5 a 6.0-W resistor and an 18-H inductor. What is this circuit'sb;6j+fhst5 j73 mh vtivy s33a time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms md ,jc0hgl do6q cy4,+ef+5un 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 t)a3qy,;; qx gzbzy+df he peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC o(v2;n xuov fgs4,nil8utlet. What is the resistance of the lam x4lso fn,2(vun i8vg;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 connected to a 120-V ac power supply. What isice r,1 bacyn 7hj/6j; the peak curren7hbare/6c j1ni ,cj;yt through 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 cw9 9tdcjkq; a8(;w uelonnected to a 120-V ac power supply. What is the power dissipated in the(dq9j ekl ;tua 9c;w8w 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 resistorodn. 1+4 t: cedraq.62em wjsu 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-Wvr 98)jore m-j resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a(,rtow(0gi pgj)m6j0kw xr h6 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 reactanctxsv d3sd+l )c3;t3jjzzm h48 e of a 1.0-mH 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 or6 zmyf pi0;.ewa6 x;mf 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 14.0pi;4 nawi26 ln:zl lc- 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 1i . f1,sty dim2l +x7timu0ks)000 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 jkvzed )e yzn3,,dy+mg/ 3x.y rn67izV AC at a frequency of 20 kHz is applied to die)x3ve/z7zyk,. dmn jyzgy3, +nr6it?

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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 szu q:qjl*7k,cw74k bmxu7s8 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 cnqyykr3t+uo- 2p2rg6x1 ukt 9apacitor 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 capa(n o) 7/(rs4hwt nbz 8gwbt9dccitive 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 cr- pzzq7lxdglcrf,2hs s,x i3 4h m(7ej6hz+9 apacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance 06c up *.(qyk2r0s jpbggfbev 55u)ffof a 0.010-mF capacitor be 100 W?c .fv2fq( e5fp gbu00)bp*6 jsgkryu 5

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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+hw lyduf)8:k( wz *uh a 0.0010-mF 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 cirmc373( j hviylcuit with 12.0 W resistance, 15.0 W inductive reac3y hvlc(7im 3jtance, 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 impedp5u+clv+qr(g drk s:x2qu 4x2ance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected 2rvrd4 s (qx:u 2xpq gk+5+cluin 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 i sd od4lzz/*wq;g ;xlq67p os6m ,wu5rf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conzs5gm do64,6ox; q*lzw; /rs7pd luq wnected 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 in7r;.djreuz p88dlsf4z lq:r 5ductor, what is the impedance at 100r7s48e flrj.8:dqrp5l ud zz;0 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 in series with a 20-mH induyh) 3w/ n;rsxhctor, what is the phase angle at 1000 H3n)s ;yh/wh rxz?

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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 1.0-1s946yq mmdj..fnl mg mF capacitor for a total impedance oyq 9 mmmfdgl..461sjnf 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 c c8dnx)ot3sh. apacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?)dt c.3x 8nhos

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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 kos mhqi0*g3osm:o lwj3 94;ewith a 450-mH inductor at 5000 Hz for a total impedance of 400000:wi3hsjmqm9oe; 3g*o4lo ks 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 re:5if)j6dmmnftuu9 1 esistor at 1.0-MHz for a totau u)fmtin9em d16jf: 5l 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 conn:y)wr9)rd emiected in series with a 20-mF capacitor. What is the impedance at )de :)iywm9rr1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 g,n2sd9 1hxlk(9dggm kHz for a totadkdm xs2 (g nglh19,g9l impedance 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 seriergsd0g(f oxa ,b ,h6m1s with a 10-mF capacitor at 1.0 kHz for a phase ang bgm,rh ofds061xa(,gle 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 w95zxb e;g,ntaeln +lq2ttrthm23p u/ pho;4 0ith a 30-W resistor at 1.0 kHz for a total impedance otp4;3z9eq/ h5n ,mx art0te;l2b2+ ulg noh ptf 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 nqo16(yh vk )mw0jz6z120 Hz. What is the phase anglezwmnvqh( jz1k) 60o6y ?

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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 a+86m:yp vra mresistor, 20-mH coil, and 1.0-mF capacitoapmvy :amr6 +8r are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0. x:9egm )).h wk)87 domls cv/mfd,dzf350-H inductor. The circuit is connected to a 120-V, 60-Hz pow ) d/gmf8))vh,mcfso:lmd9x.k 7ezdwer 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 rjg ;s x:sxjpy-d+o6 d;eactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz d gx6po;y;sj s-x:jd+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 RLC circui j* nmgls:jx,9bj2yl:t containing a 50-W resistor, a 10-mF capacitor, and a 0x 2y j s9j,*lnlmj:b:g.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for i-h46vg:dicnpk*w+; x92 if,zksc b p a phase angle of nipvz: gxkpc-,* s bc+2idwi46h9fk;$40^{\circ}$ 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 = 2cg6o:a xz /lx30.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving zx o:c6a x/l3gsource?

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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 l)gzo8tk l m c3r)o8e(d,rv o,an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supge,(otmolv)k,rc 3z ro8ld) 8ply?

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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 circui j)-k;i/aes -s vtl(emt 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 impey a ;joq rjkhqcr68;j)3n8q-fdance of 60 W and a resistance of 30 W. What is the power f af8h jq)-3cryoqknj6r;j; q8actor?

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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 4dw:;ib u m* 6nmv7/v*r ejdlxseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, andxel rb;d* v w u/dm6mij7vn4*: 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 fre9c(6q-4h- (8a afjpvkfas xp jquency of a 1.0-mF capacitor and a 15-mH coil in series?8v9(-p( f hjaapqj4s6 faxkc-

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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 hq: 6+-v6lte s/qf lgyin series with a 4.7-mF capacitor for a resonant frequency of 1sfg/ -:+l6velh6 qqyt0 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH induct- sroyxn (/hj(or for a resonant frequency of 1000(h/ -rxsj(noy Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 41mmp z;9dp5lt8tf-x l0-mH coil if the resonant frequency of the circuit is to be 1000 Hzld-l;pm8 t zf5xpm t19?

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