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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 6lug - 0z;i z;yoet;xq4n-pkuflux 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 83ii4 usty *wknxt (u4states 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 wirel4x*u-4znaegj ar2g(+s1 deh in a coil produces what kind of change on t(aez ng4e+*s1gjru -2 adl4hxhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire 6f+gg-rq8erbf g+ e-* (;vxt5viyfvd produces what kind of change on+8vfex( - ggrfq; vri f-*t 6+yv5dbge 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 ki2.s3wup(wpvl s .xwl*nd of change on the induce .l2p s3x.lp*sv(www ud $emf$, 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 ep 1j,;*bgru tq*k(wl 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 current k .fgyr m*c9/0 6bx.idievp,w in a conductor will be that which tends to produce which of the followiwp,d/ v .f*kgbimi6ry9.x0 ecng 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 horim t0uejs,i9b0m5 gud r0 o;7unzontal table. A bar magnet is held above its center with its north pole pointing down. moue9i500ugbtj dr m0ns7u,; The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a hori x-3,+* wgn4)pvy:ook ocfkhxzontal table. A bar magnet is held above itsxok+kg onx o 3 ,y)pf-cw4*:hv center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where lqgxbu7e(;m. the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fieldm.xue(g ;bl7 q 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 ay m zh349;ek5yl9idh q level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ; 3 yk9ylz9hqih dm4e5of 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 6z6b0k+l hn syn ye/q7l*tbwom-.ic;magnetic field points straight down. The mtkn7/o;. cnm*0s qey6lbb y+w6h -liz agnetic field 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 horbrof1x) ,n k3oizontal table and carries an ever-increasing current north3 o,1n kx)brfoward. Two coils of 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 tvyo.z (uq)r 1 * bpih1q;1qlee aez9r6hrough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fr*a(lqi 1v ;b6eq)hzzu1o9q e .ry 1perom 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 jsl 5 0k 2t9/po4jhs.7kcvqwhan axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of thj452/ wj.9qc lhko0k7 pt svshe loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoseldh88dho 5 n,e direction can be varied. In a region wher ,hdon85le h8de 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.d +t +(gzsl5f ek9h8yg
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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 ,2 k/3vjixtv pthat 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 magnetic f erya9/b8eekr;2 ls7c ield. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at cot/b npi)h mdl0yj)/a. 9zguj-nstant velocity thr9n iztbu lh/gy/-j0pdm)j)a.ough a 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 rotates at a constant angular vev9k4q y4idxd2 0uv 7vdlocity $\omega$ 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 transforms/jtd,ic48 dli p mtig2a(t. .a

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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 thr6fk-uybl7iz2vmxbp u d, 4v-3)i ehe*ough 60 revolutions each second. The frequency of the x47e-6ivkfum3du2elby p ,iv-*zb)h$emf$ 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 de6n,sknf*z vz(vice 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 derkr7 eu;u/vypkdt0cl6 cbxc*8a 55 + hvice 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 3mx kskq23 0hmr;e4r6ig jjk)loops than the primary coil3xm k 4s3)mjg qjik 2h;rrek06 then 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 thany(ao)ii8 p1 vcfx-zk7zzqm67 p,ym s6 the secondary coil 6-yz1z8c7 maiq( x,f7oppm ziy 6k)sv then 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 pohapat00 /j icrd-57s xk8j6spwer 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 c, x9 (yw/hoz-j .eoft l:zge*kircuit,

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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 o:7q 9bl h1qhb+tmr 3useries to an ideal battery of constant terminal voltagh o q9+hbrmbt7:1lq3ue. 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 a/x t8t; rwl.dzn ideal battery of constant terminal voltage. At the moment contac/wxrtl. d;8tz t 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 conpt8;2qqjok.0z (htt 1a e (uwonected 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 resistaqdfj;,540ae br4 bh9t.).wse dci u tence 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 aregr4.axpk3(8-a* jt6g h m hxih connected in series to a battery. The time constant for the circuit represents the time required for the current to ra-86a mixh h4h .*jk3rt(gpgxeach

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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 batteg:t l hh86ui r7ld -5von.p1iury is suddenly removed from the circuit. The time constant for of the circu15ght7o u vh.l :uinl-8r idp6it 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 units exc2)6bbquq e p y7+*j0fz rxuu)rept:

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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 ekw8qn8,hj0c y 14pq fAC 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 pb74pjqj- m i0to an AC power supply. In this circuit, the curren 4-iq pj0pmb7jt

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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 far bzyzgma6i37n5 37tnctor when the frequency is tr ma73i7zbn5gy6zr t3 nipled?

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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 doublm,mmlmd-u 7elf 1j-y 5dd4z +fed, the inductive reactance of that inductor djdylem1m,ffu+5d 47-lm-m z

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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 voltag -e 4s19 zt htx/,9dzrj1k,bfiwskm+ ie across an inductor approaches zero, the inductizdi/ 1 9sth-m9t,f zjri +kk4w, xeb1sve 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 AC power supply. I);aa5allk e- 628c4cw hs icj8;yptsbn this circuit, the curreaa ;ac6lilsy 2cs; h8jt k4bcw8e5-)pnt

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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 thep0n5uuv:lab 6 frequency is triplvlu 0ap6bnu5:ed?

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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 vow2gmpjf-2j z7ltage across a capacitor approaches zero, the capacitiv2 mfjw2pjz 7-ge reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the induct1 z,xzjy;2.yk kqztp5 or and capacitor in a RLC sz5ykkzj . q12,;tzxpy eries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLo wqolpn(z+6iw/2v9 mC 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 increases if Rb l4d om2-5vva increases. When i5 bdmv4o2 -vlas this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasezz+( d:ya dm jysxbu12xeg vi/0v /c/*s 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 ii,me8 /kt7no bncreases 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 t q0m x 5 at5 ,d/91v.axze6fes7evvmcihe capacitance both double in an LRC series circuit, the resonant frequency of that .casm/em zqad795e5i6fex v0v1,txv 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 :2hmfk32xxtf3 t)k h2ne u )npby an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuiox79yl2 nec,ed5j9n yt occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field o a6u yx5wpnehe)y gld s 3k9813z;xxi3f 0.20 T. Find the magnetic flux through the loop when the plane of the lo3zd5gxe3k)36y8na9 wy1hxl ;ieupxs op 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 magnet0buc d-c1nyx+./jus mkj v82 kic field of 0.20 T. Find the magnetic flux through the loop when the plane of tk1jd jcc/ 8 b+mvk 0suu-2yn.xhe 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 magnetic zmzz+-j+6d arwo,s 1efield 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 of -+aswdoz 1 ezmj,6r z+$30^{\circ}$.

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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 adjustadr.e+v-ny32wii-f 7* osap/xz tkr1d ble 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 changesqsym,r+ re11k1smm3t ut(1pk 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 wisoz y8** s9ywu2 ;tv7ic9iob6k hjcxni3; r7oth 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the f;h sv* yoccr7k6wuo2tb x3ni*yi;j9z 98so 7iield 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 with 15 turn;lrn: seshs *9s and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area(z0sf 4z7kws u $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies p6t(vp .ej- kzhorizontally at a location where the downward component of the Eav6k.-zpj pe(trth'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 is0 t6t (dd*ie2aql wi9wpq, 8ko 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 in a constant magnetic 2e 6qwl8diq,*aw(p0t oi9tdk 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 loo 16otvvxjr t19ps 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 tumto9ij :k r+ :t8:yivx8cai+xrns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Ede /*j3sweei mc/., zs.q)o1 l;gv9l p8ykrmkach 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 in a uniform magnetic field of 0.30 T, whici.p we3s9 qg. vzc lr8kys/;meld* m/ko1)ej,h 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 ofzhr 9o729zar c f+lpt+ 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 outpu 5;rwu).*q pl;ktulslxr-i j;t of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availables xpj;5l;ul)tr* -ir .ku;ql w. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a ma30 oe jeva4zz73nyb4dximum $emf$ 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 moto3hxdtscw , 1h/r have a resistance 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 mgn h 2tgyol6*nj2z1n 2gui**xotor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates azgnj22n6l hn g*ioy*2 tu xg*1 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 powe 1nquxo6 oax k+os)57vw(1ixa7 kv3s zr supply. The operating current sx(k6x s 73kawniaovx5 qzo)v11ou7 + 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 6s 8m3 fj dh1,ansp(whu,o-wzW is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is 3h,-6pwho,ms f s8 (zaj 1udnwthe 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 v0:z ad5eqmg 16.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the baa v50 q1:demgzck $emf$ 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 neededn sxd(vspa 42; 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 primary of a ug/lekbz*.l;, i0 cps transformer causes 14 A to flow in the secondary.s,l0 k cub./e*z;ligp 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 necess1khuuf4 +3cfaary in a 110-V primary if the 24-V secondahuku+13 f 4cfary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary cj-z3k1k3h vwl oil. If the current in the secondary is 3.0 A, wkjw- 3l3vk1zh hat 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 aty9i6v+ms.k m transformer. Assuming 100% efficiency, how many ampm. kstivym +96s at 24 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 x9l+ew 8xww py z2u,,ka neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the prx uyw ,zx9wpk8el,+2wimary 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 300 turns on its secogsd:-pr rn 4(bjpf8a3 ndary coil. If 120 V at 2.0 A is applied to thf bp4aj(:rg-pr ns3d 8e 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 d d,czr:r*9y xf97n3jc1j t eis iek3.has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secont.*3z9ef7icr 3jcnye,9d k j:1 ixrd sdary?

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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 0c b,n4oxej -qic :ls0z3u05 /dc biorand its secondary has 200 turns. If the input current at the primary is 100 A, we s:,q ebjz0b0 0li34oxcicuno- 5cdr/ 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 secl74(lg9 zkrqar 0en7eondary has 200 turns. If the input voltage to the primary is 100 V, w(9n rqel 7ez470 lrkgae 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 ot+ovf.b82,0 mcnakvsb9 )be turns. If the power input to the primary is 100bmv.9va kt0 e2fonb) oc,+ sb8 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is ujjzg9jv ty53 r usmf:r- vv5h62wy)ij 4s 4c9msually stepped up to 4500 V by a transformer and transmitted througu:2vmm r4 4sgvy)j3cvy5jr96z jf 5 9twhij-sh 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 usuaj:h x,o vgk3my-+hos+lly stepped up t+osyg3mvh +j o: ,-khxo 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at htckn/jf-h: ywt4o/ + 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 los /oc w+/4 h-ftth:kynjt 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 a total resista1rd0c/dy8wjsw i / n5xj3yl)knce 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 trjisywkl rcyn8 30 1jd/)/w5xdansformer 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;zq2f t bjjj.pw(+8yn 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 nt8 pwjz(y.q2 jb; fj+due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is 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 dowph vo(wg xpw)57j7g 5sn a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1(g v )7pwxg5ojh5 7swp000 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. s5+60w(:i qwec/yorfl7 fnvr It is to be transmitted 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 transmission5 re i q6fswlw0f oc/(:r+nvy7 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. Hol5fsz .8ib c .bi6hf3-vpzxg5w much energy is stored in the coil's magnetic fielb vzhs5icb 3.pzl.-6f5x if g8d?

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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 1xl h*6*8 mbrxa :d)bwu8-H inductor. What is this circuit's time:6bxha *8bdruml)x *w 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 voqpw+*a)wj9ah ltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curr84gsdime ;r 4jtx *wg(ent?

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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 outleibb5 . d.-;mgae 8zak5lc3lpxt. What is the resistance of the lamp?mlexa3z- .8 a 5igc5; bdpl.bk

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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 connh 36ea3 )xcmjmected to a 120-V ac power supply. What is the peak current through the m)6 acme 3jx3hresistor?

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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 *5(.yraav wyb supply. What is the power dissipate5* .ywbra vay(d 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 nx 4j6jzbffx*vo i,a wf7(70ga 50-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 r-w fp. 1:f7/ xrijfbdmesistor 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 r0sgt+8 c eyj5 kj6o8i6gfz; n e,ixr.50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance ofiz 64niawstoox6 fq.lgh0.), a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive w9 ll7ty9t b2fw3unf6reactance 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-mH coil have 14.0 W of induckoa7xh ru6k)6q2 /ux gtive 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 Wdtay0wiv* o q))hq3z 5 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/cu zl:duvtt/3yp+vst b ;l *4 inductor when 120 V AC at a frequency of 20 kHz is applied/ysu cuvt/d; t3pbl: vl4*z +t 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 q46htr2w.rq2abon* na 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-mF capacite51ujue6d/eo mgx55vor 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, sgly j1nq ia6e* pxm0r ,x9h:9q;pdu 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 does a 10-mF capacitor have a hd3dqvw(zncginilh b7-a4 g6 gz. 1) 7reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactancp(n/4 j56rclxw9 bzzpe of a 0.010-mF capacitor be 100 W56 9p(lxrnw4/zbc pjz?

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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 capaeg*z+r 5zs4p)n36 qy6 hwtmzdcitor 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 9rdsvly8j6 )xb5y;ve of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive x95sjvd ;6y)8 lybve rreactance?

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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 im-0l0fjbxxfb x59g.w fjx7lvo wk6w* 9 pedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sww90k.-lwj gxb xlovx9bf f05*fj 7x6eries?

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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, 20dk/9emz gu 9.q-mH coil, and 1.0-mF capacitor are connected in 9 /9kmqd.zeguseries?

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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 connecaxvsv(sb.7. tted in series with a 20-mH inductor, what is the impedance at .(bx.7 vstasv1000 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 connec5lqz:3t a.bklu afp b .-ob2f(ted in series with a 20-mH inductor, what is the phase an z3 b fblqa-b:l(.5ft.o2up kagle 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 serv* gmr43dkl mxx3:jtzzh+p0 z-8y ev6ies circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 10pl v g4+0zedzmx3 -3rj8k6x vz: thy*m0 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 series wie05j -8u7u8 ko kobafdth a 100-W resistor and 15-ma0 8bujduokkf- oe 785H 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 must be put in series with a 450-mH inductor 22i t4-7hfjg bwo j2qdat 5000 Hz for a tota 2wi7jhf -d4 gob22tqjl impedance 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 resistorc(/a kt p -/wfyja7pce h:5)ks at 1.0-MHz for a total impedk7tya h/k -eaj:)pc(wpfc /5sance 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 seriuel 0u4e,r6d4xz1cm h es with a 20-mF capacitor. What is the impedance at 106m4lu,1cd4e0z uhe r x00 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz forug0 gi)ox,s/hk wi/z 6d*t( fp a total impedance of 45 i k0guwogt)i/sx (p*/h f ,z6dW?

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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 h:ao ;; yscs5fwith a 10-mF capacitor at 1.0 kHz for a phase angle shf;:sao5 ;cyof $40^{\circ}$?

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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 resi80qg * kvuyn3mstor at 1.0 kHz for a total impedancekym v*q3g8 0un 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 withwo;eb jzx-0qq2ur ko z :8t2nwdz4h,9 a 100-mF capacitor at 120 Hz. What is the phase anglwd,2:2rbh j ;oqzwu9zo4xnt8 qze0 - ke?

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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, a.2x (4 kugprebnd 1.0-mF capacitor are connected in b keg pux(4r.2series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0sb v1joo k*)o;w: k:x6dlz nn8.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms k:6 zkn:vl*;1)soonjwo8xd bcurrent 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 reactance 30 W, and an inductolj 9dhr (.bushvgp(50r of inductive reacta . 09hg(sh rv5dpj(bulnce 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-Was2o4h8 eyq w3 resistor, a 1s4 h3 aq2wyeo80-mF 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 500-Wkpwef.0l xbqx c6je-/s+ /9ep resistor for a phase angle of x/epc /sjf-0+pwkeq. 6le9bx $40^{\circ}$ 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 Rmlqo5xjd 5:w v4)s m.*qk8x cb6z+ble = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maxi8)x* x cl +b.5bel4vwk5q:om dqs6jzm mum 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 12.0 W resistance, 15.0 W rd;:-w h* y2yyve:oyiinductive reactance, and 10.0 W capacitive reactance, when the circuit is connectedyve yi wdr y:;o-2:yh* 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 circuid -dtwdx:3;w mb)6h: m; hpd*(gpk vbit 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- xhhecg1:ni*;4azw- l (ukh vj 1,xvk of 60 W and a resistance of 30 W. What is the power factor?h- kh1,c gk*(u4hvjl - v:wai1xnxez;

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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 circuit5ef /6ocd0jl0vkih3mau w1 a 9 containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connee 9l/j1 udh5omaw63cfak00 victed 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 capacifi6+ zbu c4wur0x v)u7- ;whi ;dr)xsftor and a 15-mH coil in series?+c0u d47sw)ixxu6h ; ;zwruf )rv-b fi

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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 n5gw+e 0l rwu8hvi 8l:k4o/ rewith a 4.7-mF capacitor for a resonant frequencyv oelnlh8wrewu 805i:gk 4/ r+ 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 se/kk5l (c u x9ebd;4,ky( cxgjiao0l 3lries with a 3.7-mH inductor for a resonant frequency of 100xj0 c/ xkcygi4le9o ; l(,adu3b(kk5l0 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 withy 8oifvvm*pc u+0rt (nb;*s 4q a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to bn *r0su; (*opmvbfti4+vq 8cye 1000 Hz?

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