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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exd)l e1lx0:acy cept

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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 inductiok(ubu bx2w3.. hyhy *2*dbpryrpx cd,e7*6 kxn 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 b4m xtc.k: 0z) urkl;fwhat kind of change on the induced z.)xf;kbr:k 0m4lutc$emf$, 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 wirek5w+i:m ui7m d produces what kind of change on the induced :7kiuiw5 +mmd $emf$, 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 theoyimi.62 qy. nsphpaj91 rb 6 .73autv induv6pn.i1 .stq9m.2 ybia3u j6ahyp7orced $emf$, 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 fromss ,-*64spzuh +x s3wum zyfs9 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 cm4odq bvvo 1g-nu/d ea5i4n18 urrent in a conductor will be that which tends to proi4md8-4qboo /1n15 gun evdv aduce 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 10fn99e 6j5jk vxjtoi)vzem 0 a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when1k509)je6 vn0xv zoe9tfij mj 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 magnet is held + 5ab lvya1t m*b1.v0 yxhi8kyabove its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fr l1y1m ihx5ba*v y0vk.y8+atbom 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 regiu 5u6bj p3naq1t 6ven.on where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inducee j uunba.v6n63t51p qd 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 w cfcc+ ),u.vjkhere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of tccf u)k.+jv,che 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 horizonb (bb8qlfyv 4ut0v 8vlhp.5 gb8hqb70tal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this colh8 0 08gv q(fbbybtvlv8h74bp u.b5qil 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 tab(az j:ks g;zi;3m3 svule and carries an ever-increasing current northward. Two coils ok uvz;3asz;:s(j igm3f wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enterinm9w( jw* es.7esl+ aezg first. As the north pole enters the wire, the ins*wz9 a.e(jl +wms 7eeduced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an arg6 y -amde62hxis 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 arg 62ha 6dme-yxis 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 c+v xzq:fi25dewgv l,0s y,0a is rotated at constant angular speed about an axis whose direction can be varied. In a region ay:dcz ,0is2ge0vwl,q+vxf5 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.-o irj /i2bh *:hiuhf/
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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 :2cr 7sup9 butan $emf$ 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 ma *h0qzm8/ idy8rtk-a pgnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west directc +yuql y-j7 2we/+rjtion) is moved northward at constant velocity through e2j rc uyw/l-7jy+ q+ta magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotatesyin)ri,, po- j0lcp7qn67gnbr ( r3ml 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 tra8, anjsu;kq a7uxj01 of: sw)dnsforms

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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 thrh(s/dk chxm 09 *yxa8wm 5z0rhough 60 revolutions each second. The frequency of t95mrxd h(h0x0y*w z8amsh/kche $emf$ 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 us xx p.yfg0..qur;i2y8:tp xt ked 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 that8(h.j5;yfdw) sfs;v. re:jx yr da:gc

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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 contair)acg1jj 6:+-yb1 ygg qpk v3ens more loops than the primary coil t:y1bj1vp ry- +g3) eka6jc gqghen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops 7e xh+t061u ve ( yvfiq.f7dvvthan the secondary coil then it iefvx7.0iv7e v6du tvyf1+ (q hs 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 po :kz- tjr)fi(lwer 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 circuiqz4d4ygf vo,el8h z87a) cty) z: bdh5t,

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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 bamae eg6/7 fsg55 y1qcattery of constant terminal voltage. A1qgfy7gsea55/a m 6cet 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 ideal battery odj1 uu-d.mq8 tf constant terminal voltage. At the moment contact is made with the battery, the voltage across the i 1d-t8.uj mqdunductor 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 be 9o g)jmq11vR is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to anhoszsl skh )v x;7a2;/ $emf$. 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 seriyl l j+buui3pn,/m,p ,es to a battery. The time constant for the circuit represents the time required for the curruip,l,yn,bl+ m /p j3uent 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 serizyc m903 ewx, xddpc9;es to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time ccyx, pwxed09;3 d9mzrequired 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 sam7 :dv7) .qt i4e92xtverrinf me units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectediz8tm j)z8:ij :qed1r to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cur.r+lvkh2 2(hu+(yh (wfhu75 yqbu 2ljy 9xl jlren2 2kl2(+ 5fhll yrhwb 7j(hqu+(x9yyl.uuhv j t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the f jal;qh2j vat /+rx2(wrequencyqlah(twrj +;a2j2xv / 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 voltage across an induc0of6t;.sf1hbk+(ore )y sct j h0k;entor is doubled, the inductive reactance of that induct+ ks6;. b0ochy)reonsft1e(0 ;kjthf or

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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 approaches zero, the *;u b6ntvbsw.a mf5zk7(h e5binductive reactant.b*kbm;va5 bwszfu(e756h nce 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 6p-cq b xwn wp*- zi+vz29dn+iconnected to an AC power supply. In this circuit, the curren*+pwip6-c xidvwz9 zb2n+q -nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance + a4a9 spkkg2+raog m,in an ac circuit changes by what factor when the frequency is ,praa am4kkg +29gso+ tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero,yzdt4;0nqs g ; the capacitive reactance of tqdsyg t ;z;4n0hat 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 betweenu9 z2p)bsn h,r: kb;hcq6vu(-f vs r4x the voltages of the inductor and capacitor in a RLC series c 9 ,;sv:rvfb qbs()p6h xznuh-cr 42ukircuit?

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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 twe8osrq 2h :4r(bni7;ehvw+ 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. Thebbr+ ));tw+qu ml2rs l impedance of the circuit increases if R increases. When is this st)qlmr b2) s+uwlt+b;ratement 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 circuim6kljm co/v/0agq30uvc6)1o 9lkqj it. 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 increases8)2)pwdoocj o+ql rx. c;oc5 j if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double io xbm wd614n rzm)wyx-t -jo5sj+h4v:n an LRC series circuit, the resonant frequency of )4mn oh15jmd z-yts:rvwb-+ 6x4w jxo 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 tha ,joy1gq + 30wlh/kf)hf72qjxb-j2jchq5pl h t is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RL b7vbjffn, kx699zk2kC 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 a uniform mag5/o w4ohq:daf0 e. rxbnetic field of 0.20 T. Find the magnetic flux through the loop when thh d0qofo54 w/xea:. bre 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 of 05w6tn5zxv- dlu 3 ut,9g5 qwid.20 T. Find the magnetic flux through the loop when the plane of the loop and the magne63 nd wx q95gvul idtzw5t5-,utic 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 rou l 2jlsgl:bwcg.,ju;)m b2e, tating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the;ubl ug2)g je ,c.lms ,wljb:2 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 areay:;0y2 7c sp l jcnjcojd-jo2kl9)tj4 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 y 07s0ac4ez v 2;nupjfchanges 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 frame wi.argp02yzs . bth sides 18 cm. A uniform magnetic field is applied perpendicula2ya.r z g.0pbsr to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire w vnbn9k p7p948c2e w1woln9ei ith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns an6 trntf;m9b)krk o0 a*d 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 .udn*8 hifafgfhb6,560 m flies horizontally at a location where the downward compd guhnh5.ibf8*f 6f ,aonent 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 cox irkg;n:ah; a.gx35 bnstant angular velocity of 2.0 rad/s about a verticalh:ab53 a .;rxxkng;i g axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional/2 *iei 0cmbe/ c*vaqx 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*f*ks t jzf2)c 11fjb bjpb-:n wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop j1l+sjg.hn938at z b( 3v nld*sjxt3qkgv7 ) ris 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the .lrg) sta9v1 +nj (jgl s3djq7hnx*b83 3vzktloop 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 turnye5dd6l j vqxtx:)g lna8- d;ba1+s0rs 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 constructd*6n n8;rhhjl a simple AC generator with 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 rotating coil is hl n6j;r*dn8 h$100 \; cm^{2}$, 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.u+ mr 7a:xf w x,m2ur:yzte,kov;bn4 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 4.j s*q v,r2finr)wje 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 operates on wwrsbinp/2;t-/ gc2e120 V AC, and when running -2ewrsp/t2 win/gcb;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 24e bk9st.j7 ,seyx.u 8c-V power supply. Th9ubytek7s,..ecx 8sje operating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2oy,5xhk r;v15a,ol gvs gu9c*0 .fxd*og,sh x4-V power supply. The operating current is 1.0 A at full speed. What is th avudy1fx9lc*ox5shsox .g5 r,g*o,gv k; ,0 he 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 is6:vgx)zh21okme3 d t )naek6ow:um3d connected to a 24-V power supply. The operatug 3)ko 32e:)t1zdow6mvmh 6dknx e:aing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage of s0 +r8a)fxpkfuul r tl 93w-0ud n-qg3$120 \; V$ 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 xg olgvez+ 1soi.705n14 A to flow in the secondary. How many turns are7i.nvgxoz+0 5se l 1go in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 2rs-fph9zjnrminq :0 /-e 7v v54-V secondary - h -/0zn97: qvmi5fnpr sjevrhas 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 2htq ,2tx1/csizgai/ coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wh 2hiai1,stzc/xtqg/ 2 at 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. Assumi qhwk;jl,-d/6yo, ;h/(kbagnr abc)zng 100% efficiency, how many amps at 24 V can flowgywhoa /c h6nl, /)b(ad;rk kjbz ,-;q 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 V at 10.0 mAt3d.iowp5fq0-ew aar j vn;3 ). The primary coil operates on 120 V. Whatraa5 )ev0;no twpi3q3.- dwjf 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 hasmk r/9uwo97q/dbf-2fkgv ,ik 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applieu-rf k2dbkv/ q9kf/wm7io9,gd to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns o * jvu/ c++wlyyju2w;wn its primary coil and 300 turns on its seconday/w+;lu j+wcjy* w2 uvry 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 transformp8m 2:wa)s esf y y.e,ny-utw4er has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the sec ya ne)f :y4w8w -2e,symtsu.pondary 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 se c/wknvz/ojj2, cem4 *gov 49mcondary has 200 turns. If thec,vm2joj4 4* vekcg m9/ w/ozn input voltage 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 its secondary has 200 turns. 4+m-d-wd lssh If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fridldmsw+- sh 4-ctional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is uhktid3) 7 - d,jtspm-ne7)gv jsually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fin n -mtj)ehd)7i d 3gj7v,pkst-d 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 usuall:m/j9pyngj sky kf;;2y 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 thejys ;m9k 2/fpk: ng;yj 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 cu0pxgodfcx+z */u vnf )+irp)/rrent at 120 V. 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 percentage power lost in the transmission line if the vo0)uf+p*dfr xo zg//i v)np+cxltage 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 total resistanceftrva: 2gka ra 2 o2el.2-o/tbt dpv+0 of 0.60 W. A generator produces 100 V at 70 A. In order to revgt 0k-l22pv. a2b+ert dra/2ato f :oduce 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 gene 1q w;q2b.xuuo2+fk ovrator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voox;uf+b1.v 2ko2qu qwltage 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 mu8 z)hr2ne+ks5,wfo.nnwr( y*y,sx xich less power would be lost if the power were transmitted at 3000 V wfs,i2ynk5x hys),(x .+oenzn r*8 wrinstead 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 tran5voi* nuea)zgu-, b3cpm 3p,d 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 ini,p-co 5gzn u)*p3,emdu v a3b transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much ener +feb jaw88ad1 b ;b) l+kgmz6b0apgn;gy is stored in the coil'+a6+gj emfbwga);0 dza8p; kbbbln18 s magnetic 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,ae.5iz du1nxvpeob2;ao4 9j.0-W resistor and an 18-H inductor. What is this circuit's 2a514daoe xb e;vnu o.,p9izjtime 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 voltd,2:xt wnoen + jedl,2age 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 1r ge x8oy6a1(l2 kzg/g20-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 outlegeera7u ,(4:c zr vdikq)1 y8ct. What is the resistance of the lamp?u7cgz (y)r:kde qie41cv,8ar

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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-gc 8lb9d s9r.zV ac power supply. What is the peak current through the resistor98.dzgb c 9slr?

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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 supp b4 (.r1rvudw*iq9 arcly. What is the power dissipated in the rri (vru1b4w 9.a *dqcresistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is nxrzf1 9g+ thkyu/(q; $I = 0.80 \sin (240 t)$. 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 pl+lfhz i, 2e utzm4vg6sm+:0 a 50-W 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 50-W re4 ei d:6 ,l nzvqgnv7to2t8fq*sistor 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 9/zh-b tbnwj9zt/ fm51.0-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 reacta 4:- ;blny1 hlx)cl1rgcvv 2)xg1cnf jnce of 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-m t2od -(tnb x3c3otsk6H 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 W of inductive reactance at 100 4tom b:jqlk8.0 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 frewd* 3ha kt3uu7quency of 20 kHz is applied tuwd3ta 3k 7h*uo 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 t evzyybaw4 k0(n*iinyg .x(b,6; rkn- hrough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-m07ds rf(pp k9cF 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 capacitip ,-fhwkf) fyeuy8 /3p +uc3hhve reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1+y;gsnl:x2 r-e qc:blu9x s0l 200 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 capa l++ncjw3ip:kgxt-gz;v u1d 3citive reactance of a 0.010-mF capacitor be 100 W-t kzlu x gvpi+n +;3wcd:13jg?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 Vc*q4ric/ de p/ *m9lsd?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedancj:dlx -+)3 bqoc m4uvje of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacta:j 4uvlb-qomx+ 3cd) jnce?

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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 1mqz b k3ywn(v-h:rd0 inbdrut-*( xb8g +.m6r500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?h xmv8(ibrbnq -dgk 036. dwt-rb:z+rm* (uny

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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,m,s 9 6xyw ke0wv0nu(s 20-mH coil, and 1.0-mF capacitor are connected in wuen(x,0y 9ks6 wmsv0 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 co mxy2xtxfdw-w: -6g t0nnected in series with a 20-mH inductor, what is the impedance at 1000 Hz?-2-y mwxx:fw6xt t0gd

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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 i-tsr :ftfp-+i x4zvuhb l *88ys the phase angle atf+l vbz8-:ryp 8i-hutt4 *sxf 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF *ydm(plhl6 .wa4 ;um ycapacitor for a total impedance of 100 W at 1500y*.a46 lpw hulmd(;ym 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 s,9snz 8/gew)8sz 5amtv7drwweries with a 100-W resistor and 15-mH coil to get a total w7vm8w5/)se8zgw ,ans9rz td 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 must be putpr -ro+qmtd+8 in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000pqtrm +rd+-8o 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 res1ye 9nvvxcq vo1 67da3istor at 1.0-MHz for a total6qenvvva3x71d oy 19c impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the ikd.umx an0 -s9mpedance at 1000 Hz?d-xm ku9sn.a0

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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 wxif2n 5c 7bhx vvaip(sh+2fo40(ju1aith a 10-mF capacitor at 1.0 kHz for a total impedaiaf+4u 2x fh0opb15x2vvj sn(i(ha7cnce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capajk akawd8e n givzd s4;*xc)j)y3 i9:*citor at 1.0 kHz for a phask9dvz*wa)j:i a 8ck jen *;4 idgxy)s3e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a tohs55 2qqfkzt5ke 7 wo6tal impedance of 4h6k5k 5w7 zqest 2ofq55 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 is thegteiyij2+7 9 c phas+2gtjce97yi ie angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.019z lgaa m6z)n-mF capacitor are connected in ser zn6a1 l)9amzgies?

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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 -8uknxj a:-ixya6 j,z, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to aju6xzyj--:8, xa in ka 120-V, 60-Hz power 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 rjm++ 0e9szjc keactance 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 this9+jj ke0ms cz+ 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 a3 b gud1f1v( dnm.rpt0 50-W resistor, a 10-b dm. (t0dfn31rgvpu 1mF capacitor, 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 50-;y lo u nx)xrvtz 4n:e;vqb830-W resistor for a phase angle ouv) 43nbx;v8:-ntyzeorx q;l f $40^{\circ}$ 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 = 0vh, a1 r6yqvw20.0 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 d1 h0rw6yaq,v vriving 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 w9o++7sy;+zv qbkr yy sith 12.0 W resistance, 15.0 W inductive reactance, 9 oy+;yvszb syk++7q rand 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 b lbtu12)ido(AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistancou9sjid8b5u3qtl9i0 ic u* 3) t8ycmge of 30 W. What is th9gsl tyq ii83t0bim)9 *8co uuc3ju5de 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 series Rwpi68x 2)zj79pl (flznvz y+uLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H in+z2lypnxipzw7 9( v8j 6u)lfzductor, 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 sez)srye0-z .ayc+)n7 7acta zfries?.)zr yaanzy- 0+esz ta7)c7f c

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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 c ga kk9(g4vvs hl+4z2vapacitor for a resonant frequency o4l94g (k+2z sv kvaghvf 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 3.7c,x5k dyf. r)hf u5yh ;,p1kgz-mH inductor for a resonant freque.)c fxkphdu1;55rk,, zf hygyncy 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 mg.7zt9w g4w7 f;,:4kawi 7 h jriicbowust be placed in series with a 30-W resistor and a 40-mH coil if the a 7z4;gwk.7 ,w ii wo:gcb4jftrhi79wresonant frequency of the circuit is to be 1000 Hz?

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