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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 mae; bn1 wl6)efl8 lhn3fgnetic 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 inductioh 2+ 6dc1lg9x(unk)vhh -utjsn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces whath/,*iei r9+1ws lfm3hte /iby kind of change on the i t/f1r m9hsi eilih3/by,* +wenduced $emf$, 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 produces wha(st z ;m4:gjsp,p kf/kt kind of chansg (kk ps;,/ft:jm 4zpge 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 ox w e(now3z2 -x.izs7mn the induced 3(x2o.zwi 7emxsnw- z$emf$, 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 h 41ia ox2 jbcq.fvw1w2r rqe/3u3wq8field 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 conductocon2 rg: ebkqsg /k4,;r will be that k2r,nebq gocg4:sk ;/ which 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 table. A bar magnet is )0uem*:o, caii9 n bwx+.vzyu held above its center with its north pole pointing)v +:wixa. ny9o*i mb ,ezucu0 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 f u7h rso4*g,izqqrxc7() sg4i lat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and releasz 7ucqgs4 4o rqh7)r,x( igi*sed. 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 pa6ne/ j:k92c4ovonb in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current injoapok9ec/ :nn 624b v 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 reg zb)no0loa enjy53 u5,cv8bm -ion where the magnetic field vector l)nm5-0,yno 3eabb u 5 ojzv8cpoints 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 horipd;gkt(c **pbds t *7fzontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from a *b psfp(gcd;*t k7*dtbove, 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-i2am9-0jw u rtincreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above,r 0t m-2ja9iuw 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 t uh:- avh0 jz0dk qyh7z(64noshe north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abo4y:ojz6 hsz-vk 0 a 7dhuq0h(nve)

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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 ax 1sf.iv8rl.(e) xppkzis 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 ivpzsik e..f(plr1 )x 8f 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 ,ezzml y 4m boxdn;:lu*,)-k bis rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotbxe : buk,*zy- 4,)old lmmz;nation 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.sz.xxt hsa)l.n 0wu 7*
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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 7(t,4wra2)zxpjn8 pu:wg dzo $emf$ 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. The dkyhozgw5c .6t9++ea+ c0k rg$emf$ 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 dph7yg+ rae/ 6htbl8f;irection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the roe+f/hat76p8 y g;rlhbd.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocitq.;n 3ksfy c-1be0v/yxm y 7fwy $\omega$ 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 transiwl ada6 /a*/,myo l9,d3e erkforms

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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 thr ,(tz6 yadh+a utt:s3nough 60 revolutions each second. The frequency of th3 had( tz6s, +ttyn:aue $emf$ 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 usnw sw.cm3i0mrt 1, a+xed 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 device;rhrs3va94e/m r.xs c that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than th2uevrd-)5g:hg jw rp-e primary coil thw gev2r5)jhd:g- p- ruen 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 pr5j h+;r sf-/ za7s iy(v*klzay7q(jlsimary coil contains more loops than the secondary coil then ityy a5a(j srfkiz( llss*hz;-77j+/qv 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 inpu aloji (s2f -b; n)jjs.+ra*iit

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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 circ9 qxr)wh,zx(blme(uj 9 /ya8s uit,

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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 ba) l0p4bt.erxtt ;ft :cttery of constant terminal voltaget4txf 0 pr;clt:) be.t. 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 connected in series to an b0 3tw qn 9p()r6ilci3dr4ikoideal battery of constant terminal voltage. b6ldoic k0w3r9qp tri4n)i3 ( 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 R is cogif0tg)j9 jv3nnected 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 zl, oyiv 7q/-xinductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 connec9.y 2p 2wzj)fpiz2y leted in series to a battery. The time constant for the circuit represents the tim22liz.j zfpy yp2w9e )e 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. The battery ise9zo d f7huk l*3)e3t dth77rv suddenly removed from the circuit. The time constant for of the circuit represents the time required for the k uv3*) 77fet lz9 hhdr7tde3ocurrent 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 excepf1;iusomc/m-t wew* k9cu*h 6t:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is conneca mh( j,.q1kso0v .avqted 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 thi7pg.har(qgv vd/l- d9 s circuit, the currentdgh/qrgd .p l9-a(v v7

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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 ac8b) . 9epk/j. rk oberucm))w .br8mvg circuit changes by what factor when the frequency is.r8 v beg mc8 9o)bemrwur.p./ )bjk)k 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 dou:svix*mu.p) kq ccm6y 7 0j,jobled, the inductive reactance of ,m q 0pkxm* 7)cisj.j6:vuoycthat 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 2 ;i;vf1zwb ekthe AC voltage across an inductor approaches zero, the inductz 2;kfev1bwi;ive 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 connected to an A4plbfg)+p z:,d6t kxnzd;u 45fb l.awC power supply. In this circuit, the current+)xudl5p6d agp4. t , f:blwz;n4zfkb

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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 circu;i03zj q hwv6;nugj,,m(bu kr it changes by what factor when the frequency is tripled?uvq;n jh,,z0;3bwjm g( k i6ur

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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 acrosnqh h526ly2,k,umj z ls a capacitor approaches zero, the capacitive reactance of that caphj,nml2lyk2z5h,q 6 u acitor

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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 vo)qmeorxkojz7.2/.st r :zq+ s bzp ,4eltages of the inductor and capacitor in a RLC series circu)z em.bo2s,zs : qkxr/r4po.+j7etqzit?

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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 c yvaq3e*h+fwt(s s )x/ircuit 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 impe/9g hxlsk .n;9wkfo /qdance of the circuit increases if R increases. When is fxlw/s;k9/hn 9o kgq.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 circuqlq ;16n/w141ddazib tt l,nvit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases if1 a1y2gamrupz-8,lq h $X_C$ 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, d 7;wogsh6swvwg(d + yuf(+//uftok q *z,9ul the resonant frequency of that circuit willu7qu/wghf+9t(6sf*d,(slo/z w yod gvk; + w u

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuitav)g bzu6 g(e+ 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 seriesxp5mipzq ,71 s 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 0/e5m i q9d) w 4in2c5klux dxd4fk1zurotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throughk5 fd2) zuu4i x14ex cwk5qd9mi/lnd0 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 rmjs +-r se3fpd k-y:hh6.ule08 h f+mxadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fielhk d+ hyxmsfel8fm0-r: - 3+ehpj 6us.d 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 0.1ji4 5ze:0 l ql)m6ttq h+sjot00 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux z:h0tq4 0) el m56q ijt+osjltthrough 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 of an adjustable singlet ul/oa. w4il, 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 fm)zk1xtxsy5 9 rom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 b do*cxx(/m.gcm. A uniform 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 txx*/ .bgodm(che 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 area5 +7*xh :dnghqka ;8(kjscmfy 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 )9x jkfbydwslkd17q fp:-( g3and 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 flinon1 hy2 cnu8.es horizontally at a location where the downward compoh8un2oncy .n1nent 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 vbw50 qk9(g k/x,f;j acds;iuthat 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 iq; u ,k0fk( v59;/ijgd cbasxwn 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 generato 0)cx dp9ttjov+d s28gr has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire orxumk *axib:q)4bg8x) ;io1 ff 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 lom88r m/o9/l4u akkv +s5jaoz dops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm a+vajm4skz85oa l 9 um/dk/8robout 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 turny)or9kb-a bb 1l- k6bos 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 with an outputuim-7z- uun; hz z1ix6+o*ey z of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If zh6 o;zex-* +1-m nuy7iiuuzzthe 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 m3560qsgbi85f hbmlp taximum $emf$ 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 resistan/x++9ya8/sz rgjj nhjstx,e0 ce 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 motor operates3w-wfgd57 o sb on 120 dw7s-3gwo5bfV 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 re1ab spwnvf c0;m3 f26ksistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curren3 n106k bavs2pmw ;cfft?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to 25hj-:j hp1 djsqd-/i/pseut a 24-V power supply. The operating current is 1.0 A sue1j t-jq 5pid2/ :/ dhs-jhpat full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Th qq yw7fm6r14--ak f ry4/jedxe operf km -qd74r/r efj6q- 1yxawy4ating 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 need(agx h.fu2d t8ed 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 primar jt *n(f bjb )qmb(c;60xsz5tcy of a transformer causes 14 A to flow in the secondary.b0j)c6* bnsq5mxt fz;j(b(tc 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 nhy)ud,h) us,n ecessary in a 110-V primary if the 24-V secondary has 100 tsydu h,n)uh ,)urns?

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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-t x5t-tv,pge*wurn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is thegtw*pxe5 tv-, 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 trag2ire(mwj )dy10 gapaz y cg:;yn1.yd j-o,f:nsformer. Assuming 100% efficiency, how many amps at 24 V can flow in thecgayy)jwyy1m 2j-1: z0;eg,fr (. :n ia ddogp 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 V at 10.0 mA.c kdy;e9/hh2t86ty dn The primary coil op9y nhety;k ctd862/hderates 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 an0i01qcnzr y:np5tmf l7 fuk(; d 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is(:un tr1z57; nlkypf f0 qc0mi 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 turna3mxx 8e+il0c vo89 v+1mtb nws on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to+ci0x +o3bmn8a8wlt xm v19e v 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 secondary has 3w xs)gp2t.tb 200 turns. If the input current at the primarg2x.wb tp3s)ty is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If a 3-rka2odc46cw, ayzm 4d6ojthe input voltage to the primary is 100 V, we can expect the output voltage 6-z c4 kwdc6rydm 4,3oaajo2a of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secwb1vsl4d2p1vz6o u,zt2l /b lx0(e ojcm i5r2ondary has 200 turns. If the power input to the primary is 100 W, we can expect the power or2642l,/mv51tbbvllu1swp xzc z eo (doj2 0i utput 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 vol3 9 s98yzsgrfotage is usually stepped up to 4500 V by a transformsy3899gfrz so er and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usu3aj: eqare:/ tally 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 transmiq a3:rtae /ej:ssion 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 usually stcr0k4jjqyc xs2)(2moy3n mh : epped up to 4500 V by a transformer and transmitted through a power line of total resistanckh x y3) 2mjnrs2m:yqc40(ojce 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 lineh(pe xn+3hhkvrxuz zx 76) ..g 50 km long has a total 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 .h(zh67 .vxghk x3)u zepr+xn: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 hfv *,w sja:zt+8qefg2as a total 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 liw* szj+8t: ffav gq,e2ne, 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 wpe+xi 7(wx whk,g29*:kpfom power would be lost if the power were transmitted at 3000 V instead of *+xew oi wpf7wk:mh xkpg(,29at 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 (k5tfk l6zwd0 is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up k k6tdlwf05(zwith 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 sm pd/1 ,4w ykem*th7)q4mrugbc7z /j A. How much energy is stored in the coil's mabqk/d*r4 p,tzgy m7e s cm7uh)4m1w/jgnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is fynzl :j4i: sbsue8u* ;f93 uothis circuit's time constant?*b f9lun;3szuoy4is: ef u:8j

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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 theq 3s04et yhc4:i8wqxj 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 ii m(e6xebxp xh sk*(q7aom15fw/ kg 87s 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 a j9sri sbmd9fhi0dzs *sq2.;8 120-V AC outlet. What is the resistance of the lamp? 28dmqbj.z i*ri9 sfsh 0sd;s9

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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 supplec :)* -i t(xaja3iphb ,xl3ary. What is the peak current ca -,a3jp3i*eabxthir:x) ( lthrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Waq11x c- mncs/hat is the power dissipated in txan ms1qcc-1/he 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 rek ,zlxs,p -k+y q;j gjid6m ,p6xbt0d2sistor 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 resist3qc)uw -+ e-wtz g1lweor 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 resic -wy u.476yodqgkxla5) a9wwstor 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 ayu,rtt0;c ,a 6yf9cjinductor 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.h.6+ ly0cb,vil ydl 3q50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of induc;t c1ntpy9 0kjtive 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 1:3)m, /af ipyvt:-cw d0b.e;zifsnus 57 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 zy,,v+k+hnei 5zlgd :+vh-rhV AC at a frequency of 20 kHz is applih zdlvn rvy: eg+ ,+5z-i+,khhed 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 coi1z cbquh ( xbv2 nk.(0;ab4tual 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 reactal omj4f-:5a uince 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 at 10 ke l+c*vu 2co2;kx 9valHz?

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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 o3 j l76h2c,mk- mlcm e58c*bad-vcgx xf 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 capuje 8o;s9*fg sy.hf*bo((*ovo ucz / uacitive reactance of a 0.010-mF capacitor be 100 W*v* c8 hu(gu9jf ( /;oou*fobesy sz.o?

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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 a ;+rxk os. vz(29 /qshqmjc,c f1nqb/ot 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 seri9dt5r mt wc 2z( - s07psf4nuvrr9: nhno*vuy*es circuit with 12.0 W resistance, 15.0 W inductifc9tmr5swy d: ps 42u7(vvnno rt*9-zrhn* u0ve 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 impedance at 1500 Hz 41/ aiixop(uy2n*u ys if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect1nsp4yi2xi(o y/ auu*ed 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 resistor, 20-mH coil, a/s/t65y:nfitirp2utcu4wnl- 4 u+ i end 1.0-mF capacitor are connected in n/ ic tp/4ru-te2nuu6fy5 ltiwi+4 s: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 serie+m q/9v hcm2a:ad rcf d8(fft4s with a 20-mH inductor, what is the impedan/a atcfdmq+9vr:2d8 (c4mffhce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what isjrus jv,3m/a9iw1 /jk the phase angle at v/ijjws a,r19mkj3 u/ 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 andy.b *vx,ax ot2u d*yjzex69g3 1.0-mF capacitor for a total impedance of 100. z u2 t3xvo,jy*ay 9*x6bxegd W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in seriesggyo/ u,ea5+w with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000g +u/gey5 aw,o 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 5000 Hzvrjc/wcrhh* q967. ee for a total impedance wr7*rheq9ccj h./ev6 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 ahye+ny8*k;4i:b4a xb tx;7 dctzqk( f total impedance of 150 k8xdk4y 7n+4xq c(;th f*ia by;tz:b keW?

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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 il lru k.da -d)9. g1(tulggt*un series with a 20-mF capacitor. What is the impedall. 9d *uu-gtal g gtu(1)rd.knce 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 capacitor at 1.0cxo(j )ne73 0,i4ks hz7pktvs8 cs p/c kHz for a total impedance 3)ep/s,czno0k(ki7 7c4sthvc x 8jsp 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 .4hh*;og8ebajyau d :with a 10-mF capacitor at 1.0 kHz for a phase ang d;.aubh o*h8ye a:g4jle 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 ayj u b0wrtwca2k9 *o06 30-W resistor at 1.0 kHz for a total impedance ot9 cw 06brjyua2o*k0wf 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 n b u/yxhuv*w9b;l36t a 100-mF capacitor at 120 Hz. What is the phase anglbhy69;b3*l / xuntwvue?

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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 ans :* (lwi3vp*knj0pp id 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c * psk(vii: pn*0lpwj3apacitor 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 cvlt-9g8wv:g)4 rjl u-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supjv 9rg vtc)g8-ul:w 4lply. 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 cap4onc ujno12nr. c q62 -a6lkhpacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sourcj 6-nohnkuop6 r 2 ca124.qcnle. 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-W resi8+6wx/qb. 4hm smyp nistor, a 10-mF capac+8qn 4mimpbxy w./sh6 itor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistd+bi pdd)o .1xor for a phase angle ofbxdo1i +.)pdd $40^{\circ}$ 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-m5 1rz ccondjfd12+ mv+6.tt5mn9nfamH, C = 10.0 mF. At what frequency should the circuit be driven in ordmfdvmcr1ajm9ntn2o 1n 5+z+fd5c t6.er to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series tx4,j hp(rk:+ m*lpttj)q 6 thxgz(q7circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when t*l4 t 6h t: jp(jp7, +qhtmtgqrxxz)(khe 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 sml5r+gq;9fk6p( d elcircuit 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 60r.k1 , *yad8be2 uqsul W and a resistance of 30 W. What is the power factor?eqyb8 1alk.d2*r us,u

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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 containing a 50-W rest 9o-8xiia zt9istor, a 10-mF capacitor, and a 0.45-H inductor, txi-azt9io89 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:b zi/ r p*-iyquv10ld frequency of a 1.0-mF capacitor and a 15-mH coil in series?/:db*lrvy 0izi p-u1 q

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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 re+v t;cst:ce9ace0 4cbsonant frequ cce:t0 cc9btv;es+a 4ency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a *og:abb,h ; brresonant frequgbo,a;b r:h *bency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH cohh8v :kef-1n zp /- ve*euen7mil if the resonant frequency of the circu:h/-81vpn7- n *mzkfeee uve hit is to be 1000 Hz?

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