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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: 游客未登录  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 uli9 ;(uoz;w qpc5f3llnits 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 induction states that themqobc6yp ;xxh 5d;0;g $emf$ 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 o m-scagp/2c l8f loops of wire in a coil produces what kind of change on the- mcgacsp /8l2 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 magnss; hr0 i/pg5lmh:e7 setic field through a loop of wire produces what kind of changehsihm5psl; g: /s70er 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 thjx.-k:+h2t w n neimc(72fswce induced fwnh(m2cw-:n .tijxskec + 27$emf$, 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 froc1,:cy7:6rvaik)x4 q-q/nj vm hqc w lm 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 direction of an induced curre.zp1eyh/ q ;umf.ck 3rnt in a conductor will be that which te1r u hey/pfq;kc3m ..znds 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 xs(4 5yvxcp4kgbu2 ly-+ast2 table. A bar magnet is held above its center with its north pole pointing down. The stationary ms 2xtgx( 4y+yl2 v-54uacskbpagnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnul iteq 1 gs26f93t-ok(zt+na et is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet inoq9t f a2i6ku1 est+tzgn3 -l(duces (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 fidx o-v3fc* bu.eld vector points straight up. The magnetic field vanishes suddenly. b3.*couv- fxdWhen 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 mag*.g0r os+ +y9a+i*sne tfgftsnetic field vector points straight up. The magnetic field suddf.io 9 rf0+es aystns++g *tg*enly 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 where the magnetic fkv ..vux ic.a(h4b-wbield points straight down. The magnetic field wvb .ub- .4(ixhvkac.disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an eveodkjxv 5 as6/i -1(iqao6s4uer-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire.osiu6/ avd ae5qo4 s6(k-ji1x 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 ofb;/ij vm7 b0v ja7e9jm wire with the north pole entering first. As the north pole enters the wire, the indjeb;/ 9vjb7v7mmaji0 uced 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 angb;h,hw/ q 4zbb+xu4ba c du54oular speed about an axis whose direction can be varied. In a z q+wbb d/cbhhaob u54xu,44 ;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 constant angul9bvby rh ,clf26:qe8h ar speed about an axis whose direction can be by89e:bqlr c2fhhv,6 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 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.r i3oo-bi4pqz4)3tid- gfv h7
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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 bivohb ,f98f2 an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a mag hqknwk tb(8r7hw8 yw4qk/5z2netic 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 (orienteccmd71 a ;x5 y*7szmqrd in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potens;xa mcy75d z*7rmc1qtial induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular veloc+k qxx2cfm +2-4oy eevity $\omega$ 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 ts )axo5mcfu -)ransforms

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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 60w /yjjs2.32-p layu djc)v.br revolutions each second. The frequency of thecbusa/j 2j..jy l3)vryd-p2 w $emf$ 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 8 sfsy8s/myv dv ww;1-used 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 devicu05t.o / h+hyr6;qb kmbx k2qe:vep ;we 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 containorrjcc- zz2 4qqs/wq7o8 tmo/ sr3-2 hs more loops than the primary coil then -2o/ hjs 2qcs3q/rrtz48-om 7wqor czit 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 contw,tswo d;w)8r5w z f+oains more loops than the secondary coil t dof5 ww)zsr8ow+, wt;hen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the p:j.el/ef 7wjxdgrjddzo 7 5na, c*v05a /o8e sower 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 cirq2t:ylp 7f*cjyez/gcrq., : mit 3wh .yian0/cuit,

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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 a vaaifti*2u- 1re connected in series to an ideal battery of constant terminal voltage. At the moment contact 1*faatii2u-v 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 an6 y1xp;rxoa)s b02gdn ideal battery of constant terminal voltage. At the mo psd 10;2ngo)6bxxa ryment 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 /+d 4c0v(+qxog x2ikzn : phkgis 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 iub a 64koyzl ;a)oi7ny;)lg8fnductance 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 connectfn))lpg f72 6g 6 fz;yfhjqzr8ed in series to a battery. The time constant for the circuit re8h;6yflr)z67g)pz f2 fnfjgqpresents 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 inductorry5w-- li;iv i are connected in series to a battery. The battery is suddenly ririwl- y -v5i;emoved 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 following have the same unitl;(cib jzgtqy :b/*rp s 9d4p2s except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cur hqb nvz/+/,cjrent

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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 thifz)hz c)fpyq676l 4fasj0 ey9s circuit, the currenfz7a6)fh0e 46cz 9qsy l)j pfyt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance ine13 b(9;m23x,hydwo jp qm+ehe+s p lo an ac circuit changes by what factor when the frequenh1o,bey e hjpqolm psd+x2(em3 9+w3; cy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC volta)qf 4cka6 ob8yge across an inductor is doubled, the inductive reabyo8 q4k)6 acfctance 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 AC6n6zbdk, x,iy )am p(t voltage across an inductor approaches zero, the inductive reactance of 6nx)z,y m,tdak6pb( ithat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, icf8, b00 npfxthe currebcnfx0if ,p0 8nt

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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 frequn v-9m+ -qd z:z6zn5slqho *jcency is tl*o-vqzhd zcsm + 69-z5q: nnjripled?

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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 svuf7- zl mq2 ys:6jwh).,sh1v-jr h fcapacitive reactance of that capafh -mh ,1s .j:wuvslfr j2)zsv-q7hy6citor

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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 induct a,)vqx,z(o2qqigxv2sc3 i(wor and capacitor in a RLC series circ,,i soqqxq ) c2z( v23wig(xvauit?

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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 g sn+ s *g9eb2+hodsvo0k90opan RLC circuit 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+0mnsrbhevt/vh7 w7hej6 *((/ cxs jr increases if R increases. When is thisnrxcv b((/* jt s h7/6j+7h0emsev whr 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 the circuit i e 43rf*zjxi*vwr. 5lt ne8x3rncreases 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 circuic4ud gi8rm z q5pw5.qzl.dlj3u s2i/*t. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the cap h ,f;ncauhyp;p3:qj* acitance both double in an LRC series circuit, the resonant fh ;:nqc3a ypufj,; *hprequency 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 resonance0djx3 g t9w3vv,

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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 .2n nebm r ot)cl9*v8zRLC 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 (2iy /salzxnf h,a o./0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the f ,(a.i/zsa /yx h2lnoloop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field o4q j6ejn j:oty hzri5ach;;4 *f 0.20 T. Find the magnetic flux through the l nh*j ty54ac rhq ;jzje;46i:ooop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnet0eb4d6 zrb-t1gg i/ pmic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle o/ibz- pmbg04e r1d t6gf $30^{\circ}$.

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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 jjh1x*fr/:h+w unn j: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 c huy+l8 nb5vyibu3e d o516m0khanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square framgx)q/m 1x+gan+bt uckz,/nr5 + jsz:ke with sides 18 cm. 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 the indtb1 +5,xq +/s/znnjxa+cm) kkzrgug:uced $emf$.

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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 amb0-pbm+g vhpks4.c6n 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 (2g2m , ho(ox(gbk leiarea $0.20 \; m^{2}$ 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 t0h)s(rx -jxbm h,ky ,span of 60 m flies horizontally at a location where the downward compone hsx,)-b rm t(,0hkjxynt of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constantv zn 9cjo2ie : bjpr4*x87fhk8 angular velocity of 2.04jkb:9*2ejicrf 8xzp8n h v o7 rad/s about 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 50dz/pdj qt,2.3- +l zd4hcy gqa2cq4jc 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 ofmv8lgwmr-u i r1d 9omp(e*5e 4 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 ib0qicx .(fh.r -v+ngyts armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates xi+r f.(hvbqn0g-.y c 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 t,eko t8yldw49w*p m6of 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 com*wu,vmt) +uf nstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. At+ )m*u wmvuf, 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 generatoruku1fsbj 6 u. g4:b1mj 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 of 6.00 W. The motor operates on ) v+9zjpo/kht $120 \; V$ 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 molc.fd;3 2rgh ntor operates on 120 V AC, and when running at ful2clhgfnd;.r3 l 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-V dr 2gj+; vq 2 t;sobc*crp-1qfpower supply. The operating current is 1.0jdgp+ rc f ;qr o-t1;q2v2s*bc A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supa ,qxa/ *u 11eglzb*nnply. The opern,1 z* g xan*ql/ebu1aating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. T566a l 8dob:jd ek:wsov;ep6g he operating current6v;: dgeopa e8lbo jk66:5dsw 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 reduce a primary voltage g8 1 idby w k2-5d pd-zx9ak)e3daqs9vof $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secondt*x,bhqht 25 wary. How many turns are in the secondar b*, 5qxhhtt2wy?

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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 necw9g*0 -p klxtbessary in a 110-V primary if the 24-V seconb* -pktl 9xg0wdary 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 ca4pl-tm l4ij ,djm+)qio26 n goil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wh lpio -jm t4djm, gl)q+4ni26aat 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. Assu-gtxd(3 0pcn bming 100% efficiency, how many amps at gpdt-bn(c x0324 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transfg4qqu:7q nq (zormer provides 7500 V at 10.0 mA. The primary coil operatesq 7qgzq (q:4un on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and hx9-1e 7kcit ;u:fl 31j lpp0efsgv0x300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is0e j9x:l1u 7i-f p0f h k1pxlcevt;g3s 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 3005 -zod pdvuak )9c,u9c turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, vo)k9z5-d uuacc,9pd 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 secondarldyv*7 *b5vg qtiyi7+y has 200 turns. If the input current at the primary is 100 A, we can expect the o*lv7 ydvyi *ib57+ gqtutput 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 transf 3vjag 5.kv)edfd 3d7nvk 3w*kormer has 100 turns and its secondary has 200 turns. If the input vo3vf5)7a dkgj3dd.kevnw*vk 3 ltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and;ytuw n9 j ec(a*at9(qj0 nqr( its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictio ut*j9(jnq0ay;t (w(n qcr9 eanal 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 volta m 5u9iabcg*01mbfw6g ge is usually stepped up bucg imb5f*gw01ma 69 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 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 curreg v ly r .2fc90xuqw50kxm 5a4/ywczyq/zyg) (nt at 120 V. The voltage is usually stepped up to 4500 V by a transfo0wr w/)cg(xyfzy 0xku/qa5m2l9q . gc y54yvzrmer 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 voltag 7qzmjknj)caj 965ivhb wd7,)e is usually stepped up to 4500 V by a transforjn,)whjk) 5i 9vz7jm b67acqdmer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has o(f84h3n fqp3 b*j atta total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reducej(3a*h8f tbnfo 43qtp energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generac4z 25s mssrt4l n, -zfpyjl+ac kt93+tor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissio2 9s m l,tstzl3 4jncz4yspcf+ r5+ak-n 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 100g+9 xl zvk0 4wyr(0bkqke4a5b 0 V. How much less power would be llr+ya4 5 0webbk9zqkv 4x( g0kost if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tran.ahq0tvskulacw.7whsuia+ 6/3q8- q smitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the origina7thv6.l .ws chw3q-8q 0aaiq aku /u+sl power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much enexech 4(0kir;a(j np/k rgy is stored in the coil's m(; kan 4ec/i(p0jx krhagnetic 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 nr3/s qr t4.ai(tlw1pthis circuit's time4r/(1tq3patrw s. n il 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 w ;wu..j*qtkvv3cams *a 3aj9 dhere 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 intd-tae a;+krc l)q.2joo a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. W78fu4u j (autm(q zm3yuhr l7+hat is the resistance of the lar7 lua8mquu+ z (f3(u4 hmtjy7mp?

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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 120-4 plsqy) zb/0aV ac power supply. What is the peak current through ta/ s)0pbq zl4yhe 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. What 5((wnmmbt+cs/ nd b; qom.x .zis the power dissipated wmd .n((x5b/zmtcmsq+o .;nb in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50hq1ghhow6g)6 1utv+ rqg0 j0y-W resistor 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 resistore -l ) yacfq,v/pdo*64 cp;pxlue ,dzbg+.a8 w 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 resistbjey ;8h 1* 0kvchp9nior 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 inductor ad9:d jwpc(fbrc5p++ x t 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-mH cqsss l3 fhov.7)t(/cg12nsrfn.b pg 9oil 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 lhi adcd*g) .i9e nu5*14.0-mH coil have 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 W9y:a7gxobngr6*. 3pugj pxi p fmy upu271-r* 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 V AC at a frequency of 20,oe8l 8 3k9i9izoq va ro;8la* n7uxrg kHz is apple99l og7oa883o;a*u nri zrkix, qv8 lied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to lg5qc2bv dir*-j9. fya 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 react*ni0 .wiebki 6km1c .jance 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 9ugljwzz x.l8;.nx; k is needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency doj4e 41x /ild3 r.l:hdx(nlfw ees a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capac xw/x1 jy 14q1bwfc;dlitive reactance of a 0.010-mF capacitor be 100 Wl4d;b1jxfq/1 xwcy1 w?

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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 throughgk: 8qfte1;dh 6tcc6h 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 circuit withu-aw3l;wxqxz .v mh.. 12.0 W resistance, 15.0 W inductive reactancehv-u z .wmx .q3.x;lwa, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W res /) kf hnf:47x6klcocdistor, 20-mH coil, and 1.0-mF capacitor are connected in s 6f7chl4/fnkx:ko)c deries?

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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, and 1.0-mF t uk2+uit,ll1cjchme *9uxy1wr s)1 9ca921tc 91 , xse mcyhj+uuk l1iurl*t)wpacitor 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 se:0u 2bi f; lnb1 +jxd ;qur;u9reaz+neries with a 20-mH inductor, what is the impedance at 1000 Hz?n ;;bqx djr0beufl9ie+ua2ru: zn+; 1

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is tri ri .h+.grxn 89m4av;q4*.am +ygump5 cuuvhe phase angle 44nc;u8h.r .y guamgpx r59 +m*r.qvmu +vaii at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH yj :t;j1pq/o5mm(mx,s7 s pqvcoil and 1.0-mF capacitor for a total impedance o7m svxsm qj;tq5pjo:1,p (/my f 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances .6hlk:n*ce leegsl ks9xp1/7m qnv8 7.ok dn0is needed in series with a 100-W resistor and vel.68kl k:nnq0de/.9x77skon e p*h1sl mcg 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance mustbt gcdv41,w;u9vgmz )9,dg zn be put in series with a 450-mH inductor at 5000 Hz for a total impedance zbggv1dvd,w 9zugn9 c t);m4 ,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 zhhpr 2/mlz0 m v-5:yi lszk3)at 1.0-MHz for a total impedance30slhmyzvpl2: zhm r-i5k /z) 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 capacito kanbq .62y(wfr. What is the impedance6 byq.2nk(w af 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 neehdbtfak4--.7 7iul+bmyrc 3y ded in series with a 10-mF capacitor at 1.0 kHz for a total iahk47d-b37cyir-tb + y.muflmpedance 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 bhsmy(ibr-v-;hg* *s series with a 10-mF capacitor at 1.0 kHz for a phase an(b ;s s* hvrh*-ibgmy-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 ne71-tsn lf1oi evtxu 73eded in series with a 30-W resistor at 1.0 kHz for a total impe-vt nx7fs io 7l1eut13dance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What isrwv*q)58 clgjbv9(s f the phase anglecs lq) *f9bj 85gvrv(w?

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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 aizz qg1r;ms:6 nd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor zr:gmz1i;qs 6are 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 resisty+wd s boh-3ab-e do,jv76y2 2gcb9 +yxvj/phor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circu-deyh ysw9 bb 2hdcopj7x b/+v6+yg-jvo3,a2it?

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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 reactancegb3 qq1 sq3 cd,lg8*ig 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this cirdgg c qqgb33,1l i*s8qcuit?

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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 resomykqqkf, .-qh33e.r istor, a 10-mF capacitor, and a 0.45-H inductor, wheq mh kk.3,.ye-rfo q3qn connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase anglmdzko46c1sb ak.o8* ie of zob8 k do1 cak64s*m.i$40^{\circ}$ 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 frequencybby l98h ush91va/pj) should the circuit be driven in order to h1p9 byv/h)slh j u8ba9ave 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 circuit with 12.0p.kyymbbz v: mf h-q6u/sw+- )xx(p ln9e;k;p W resistance, 15.0 W pklh(;+. 6m:wn sfmp/xbx )-- qzy vbk9;eup yinductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit :o 0bl./kkygris $63^{\circ}$. 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 i6ln w pwe::jnab 42-a bb1rk+of 30 W. What is p:kwa+2labw6 bib:j-e4 n r 1nthe power 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 sej e/ia.ucw 0,tries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor 0/a iue,cw.jt, 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 9:pu6fby u9 e kyxq, ogl9hi0*ho2y4dseries?9hbuf: 0,o*xl9o y9he i 6udk2y4q ygp

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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.(wpk0+aq p *cqjgq q-/7-mF capacitor for a resonant frequ - qjkp*qqagc(0w/pq+ency 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 in15rrhe+ /lzyv:ph dj+ series with a 3.7-mH inductor for a resonant frequency of 10+r yh1 pl/d v:erhz5j+00 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 serieseyid (ez4d ,s7 (lrfm9 with a 30-W resistor and a 40-mH coil if the resonant frequency of the cirfdi m4y (9 7sz(eedrl,cuit is to be 1000 Hz?

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