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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 flu*+s t+ rgnrp)ux 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 th2l m/ ;xc95svlctxj( xe $emf$ 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 what k)7 xwhgv5i)vtcr .rp.ind of change on the indxrpr .v7h)t wv.i)gc5 uced $emf$, 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 oi5;p .isl*:qsyrt.g udcg u01f wire produces what kind of change on the ind;:u0rgys c.*gudts pii 1.q l5uced $emf$, 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 b5qagp g2/ d:ton the inducqg25db/t p:ga ed $emf$, 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 mag64p)q8hmdwcigi c(s) - qtnj/netic 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 insds zm 4v 6(wkwv.;mp)duced current in a conductor will be that whvw46s )zm pdwv;(m.ks ich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is he 94, z0mg4: rzsmpltpwb5 nrm4ld above its center with its north pole pointing down. The stationary magnet induces (when viewed from abn,m 4g:z mrpr lsz44 w0bm5p9tove)

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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 magq8ye.ygrgz v s +h8a( qz*m+h*net is held above its center with its north pole po8 vzaq8yy+(qh+* g.hmr* e sgzinting 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 regionxc() wn ( evc/hpr;t2o where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in )o;chxc2/rtpw ( v( nethis 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 taik ewl 05t8s,sb-e2 ebble top in a region where the magnetic field vector poi0 w,e s-tki2lb8sbe5ents straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where theeozm*zbvi)( g*q c4 e. magnetic field points straight down. The megmo4)q*v . ei (czbz*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 horizontal table and carries an ever-increasing rdf/ v0t;uax7 current northward. Two coils of wire lie flat 0tu;a/ rvfdx7on 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 entering fievx g .:9w9hczmo+( axrst. As the north pole enters the wire, the indhcg9 exm:xzo9v(.+wa 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 anguxyy6our/7s 6+rnr6 ()tjv ap jlar speed about an axis whose direction can be varied. In a region where a uniform magnetic field poyay6r)uv/ps(x 7j r6t +6r jonints 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 rotl+f8px9tj b z j3wv5)a t4*c a1at.xetated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mu +3et4 jxl1ap9zbt5xacj* 8tfaw. vt)st 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. s3a8qt:( ifkf-hnnb+
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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 anezor)wnpbs5fq+5 3f iu-:(gv $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The bh0u um 4pvo)fj+m)g4$emf$ 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)g+a1+ fek0fqje1b pu9 is moved northward at constant velocitypgefe ub+1k 190+ jaqf through 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 baxal5 hs9rbo5cr 8+8xc/r xj2p8 r fc;pr rotates 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 transf5qnk7n6;rav( :xqeuu )rx i(aorms

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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 60 revovuu -bhydk97c 4+f+ phlutions each second. The frequency of the f4kh+dv h9bpu-7+uyc$emf$ 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 usedf/ 6-m:wi dt03qlnuf:.7b zboc-t vuy *f2i hc 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 thas goq3/8+ ffopt

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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 co7 y.xxq8ar4/dg3cvjq il contains more loops than the primary coilxvq 4g.ra yx7/c8q3jd 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 thaaw+udz2g labh zce8)hi1 dh c/:f) 3+vn the secondary coilf))h8gazd +21 v :/l izaudh3ecwcb +h 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 p yk.n,47d)sx +k:edyro8ymf dower 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 cir *4dln, s),rh9tjvl0tlhl( hrcuit,

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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 connecte3j w3-1nyh6sses9z jwd in series to an ideal battery of constant 1 -wjj33snh6s weyzs9terminal voltage. 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 connec s2 0qf)y,5da2xjm fipted in series to an ideal battery of constant terminxfaj q520f 2sid,y)mpal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistand8+ x)q 9.zvp5zlzlp9 :jf dhkce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conneq)rg dmudp7k)g 9 1e;lcted to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. *nzbw;3+cbvnwlm rllw :8 s*( The time constant for the circuit (r; lsb nb*vwn8*lzlm w:3w+crepresents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ba ha9tjpd9bex3 p5lw+l9 )tf.s ttery is suddenly removed from the circuit. The time con9psb5wdptth3l9l xa.e9 +fj ) stant 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 unimtcjyx0qh 78 nv (.,jwqdj 3:bts 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 circuicw u:bqz ;h/+pt, 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 conneh k 98 zkog*gpdbzn;urjreo7:z-7, y:cted to an AC power supply. In this circuit, the currentp78::ynruk,bzzkg* h;de-o7 gj z9o r

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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 frequ kdsf60,wqzgmgdxq s7p6h010ency is tr 6swh6fx kddqg,1z7 0 m0qpg0sipled?

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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 acrossjwuq 4s x11g.f an inductor is doubled, the inductive reactance of that inducf1 gx.qs4w j1utor

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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 acrossuh5cbv.ky4+ qq h4 )l ok24e+eri a/wj an inductor approaches zero, the inductive reactanhwe4hvy/2+ 4)b5iqer kck.oq +j4al uce 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 conq(nm fo+e70jb nected to an AC power supply. In this circuit, the currem7ofj nq+0(b ent

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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 facto4ge:vqc 0*dh zo xxon)g9/m7f0qp)c1t0 n x hlr when the frequency is triph0/9x z4xg0ovd* 0cngho :lmpf)c 1 qxnteq)7led?

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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 capacitora:uo+i xr**qa8ws wa( approaches zero, the capacit+8rs:uw i waqa(*x oa*ive 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 inductor and caxfy,y)az.0it 3roa 6pb8-f q spacitor in a RLC serf q,o ya z6t-ai xry83.)bsfp0ies 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 anz35gqjg7,y*h cwm6b q dc 8)ae 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 imp dj/3qn(vbyrd7z; uwb 6d+:ln edance of the circuit increases if R increases. When is this statement ln(qwvr3d; : nb6/u bj+ 7zyddtrue?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circ*zwt3b q; nrfgyi5 (,*/9eost hq4azyuit. 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 imr.wo* un6,osv pedance 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 capu 3o.nk; rlkv6-pph84rr7dj/ zgvky-acitance both double in an LRC series circuit, the resonant frequency of that cip48g /u3jkk-l6pnkz vyhrdv r;or-.7rcuit 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 dr;snn 33*lfcr aiven 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 RLC circuit occurs whenq7qqxbeu ./i 9

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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 of 0wny1 (vr 5b :d b,.xh(u- zpgjsvk(.rx.20 T. Find the magnetic flux through the loop when the plane of the loop z1(p -v(s.u: jxy .b5rx,kh wdnrbg(vand 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 ik/guw,,ahyrm;w6nb +n a uniform magnetic field of 0.20 T. Fiw/m,bgkn;6 , ryhau+wnd the magnetic flux through the loop 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 rac d4u: b pk3-y20nmjgvdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic fluxb:m2vju30 4k g-dpncy through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is re-*h- whcp*ck iduced 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 c,if7z5j ech-hu gy;7yo f ((gnoil changes 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 turu-m 6qfgy8ry, ns of wire on a square frame with sides 18 cm. A unifor yy6gm8qru -f,m 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 induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an ar1fqva hb.., gpc8- 2 ihszvot1ea 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 a mm) 2;l*.wu1wj;urgbjpp x,tnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizx34:wb mgdw5vpnbl(5i0 v6 i iontally at a location where the downward component of the Earth's magnet x m:v3iplbb d50n4iwwi(5 6gvic 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 constant angular vp7viiqr68; np lv**w delocity of 2.0 rad/s about a vertical axis through one of its ends while in a constq*vp8di 6n*ri ;p7 lvwant 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-seeqxd0ly1sk 0i ; *ijl+ctional 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 of m,y,hdvcajum ;8 zq 1-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 is 1o/l;9o; jbl6qg bx2 tqrz-n)i2 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, which is perpendicular to the axis of rotation, what will be the mxlo l/r ;6;tonq)-z2qb9 ibjgaximum 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 ot;w q:yy6arnio:j6lmhz,8b3 f 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with ani9q3 cpjmogg8nu f 10,wp:phe/)r++ x anw(tg output of 12 V maxr+n+(f8pgto c1h:jwg uwm) p 3/xg,pi9qn0ae imum when rotated at 60 Hz. A 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 generator with a maximumki7z;-k u: x59ma5pmk3jk-zg1 cxf ta $emf$ 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 mo*d(e /gvvn)rm; w)rtx abk (ial6r0h6tor 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 8hewvgyt8l 3 2a resistance of 6.00 W. The motor operates on 120 V AC, and3eh vy8 gt2l8w when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplzk o:vh,h)fe cg153fsy. The operating hc53o:z1 egf ,fvhsk) 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 connectedut8mz4w, ,*gn9 wcoyp to a 24-V power supply. The operating current is 1.0 A at oywmw,n4, tcz98*pgu 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 resi g2k0c5; dpzv3:ovf 6(qqyef zc3q6fm stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wha0:;3fzk qozq6df2g ce 3f(mv6pyqvc5t 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 p -u:ky8*c:5mb ievznyrimary 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 dd(cp-w)nv m a841lvzc.1k pt a transformer causes 14 A to flow in the secondary. How many turns are inmvdw nt1l8 p)4z kva.p1-ccd( 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 prim5,/ vd 4hz q-yak8fe-qnt 4yas:3v ytrary if the 24-V second8hf:a-nq 34st4yyr,a5 tdqzk y -vev/ary 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 anpts+qg0 e8 i :s4s-kmkd a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current ises sp08i4q+mt g-k :kn 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. Assumhxra)3fqo p,;; bhx :ring 100% efficiency, how many amps at 24 V cqf o b xha,rph3):;;rxan 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 transformw9ouj ++h4ebw,i/leper provides 7500 V at 10.0 mA. The primary coil ope j,+ p+/ewi4uheblw9 orates 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 300 m1 mxhm86u1lusr 3 /nmturns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in th3r /ms8m1umxl6um 1 hne 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 ,yl c0f5 1ox uaw:s8c9gyjq ,pon its primary coil and 300 turns on its secondary cg9ypy c8scfq xuw,0 ,5j:ola 1oil. 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 transformer hwv- f)cfk xkf);wb+ vy dc44a6as 100 turns and its secondary has 200 turns. If the input current at the primary is 100 fywk + -;vwfax4vkb4c)cd)f6 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tursxc02a:ol -s *u ami*rns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to -x: 2o*ca srsa0* milube

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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 , vnudk-h0nfxt.vv6 7t r6 bv(*p,gbkhas 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output,tk,7buvthd r .g 6vp 0 bfv(k6n-n*xv 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 usually stepped ,td2 s3ppy/hii:r 9zdup to 4500 V by a transformer and transmitted through a power liy2 spipz/tdh idr3 :,9ne 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 iywy+y/u + -tbjj;6 tyrs usually stepped up to 4500 V b-yu/+;ywttyyrbj6j +y a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The va7t5, *oiqff4d vt1xsoltage is usually stepped up to 4500 V by a transformer and transmitted through a power linexia ds5f17*,tqt4 vfo 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 a total resistan31k,o56xvmk w xzrao:ce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heati6k,x:5zkoom 3rv1xaw ng 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.z.qa n4:t8u nk3shkf 64 5wryb60 W. A generator produce4zhyb:sq5k 4n6tranu.8f3 k ws 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much les45d+/wd pcw; 5ux0yctnoj:jps power would be lost if the power were transmitted at 3000 V insteadd50+un c5;jwyd/4xc:ojwp tp 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 gene8dw., r9nxqjc rator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. Tw jd.r, cq8x9no what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is s- v s(nh 9j;c;eoexy-ka )kq)ztored in the coil'ee;zh)vnkks q c;jy) (9-ax o-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 6.0- g2c7,zg m2ub:d :gnypW resistor and an 18-H inductor. What is this circuit's time d,2gbymng:ucp 7g: z2constant?

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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 voltage is 120 V7j;k-n f 4xqn .tvnj.r8pa3aq?

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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 intouq.nf dwn- t+1 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. What is the resistance n5hmvd/ 6* tdvd67o3 jnhrj-uof the lamhhdmu*d d nv6jv7 jto365n /r-p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powez09ft -zk/qhwc 3;zjl r supply. What is the peak current through the r;f-w/9zjh0 t3l kqz czesistor?

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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. Wc:k v 5zb/(phshat is the power dissipate:hv5c k /(pzsbd 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 50-W resistol9t gnpv-+id8 r 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 4dr 1 r0rj1u/kr 5s9htn zyfw 6:x2rt+h jsye3a 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 resisto sa; i/hnl bvt75emt,:q ,*owjr 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 at 60xjlh2cxu. *f,l8.l qv 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 coil aot+w93.f4cu fe*bz1v+ c a umvt 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 indm4stvjj bk9 h9/)vt;p uctive 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 d.+1chyfqdt 9p5mfc ) 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)rhrkkt *v,+(aypp eo8 5kcp4 at a frequency of 20 kHz is applied to it?4v()pe*h rk,oppkctk5a r+ y 8

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V,fqb0d qo4)7dpqe+ fe ogg9-0iu 2sh/h 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 capacn 7+7l bsl/k9miro12 bit9e cwitor 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 9z a;o8zvd r4nneeded 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 does a 10-mF capacitor have a reactancexrhmpy80em3 : of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mFg+5sphek.uw0y- mm9pp/e ky 7 capacitor be 100 Wkgk y s9ue-ym.7h/5+we0pp mp?

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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 ca67 v oga7vmgl3pacitor 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 seriw6.c yba,1jl88s.uageg x4l p es circuit with 12.0 W resistance, 15.0 W induct.g,61 4gpcw8 jab ueyalxl s8.ive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, agg.9yy, ,ir3u ra6pmvnd 1.0-mF capacitor are connectempg9rug .36 i,yyav ,rd in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF e0 rnltgv;n1, 8m9h ebcapacitor are connected in srgvhlnnt01 ;ebm9e8, eries?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is theaa1t8 tkg 3y;z impedance at 1000 Hzz8 31akaty g;t?

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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 connectbuz f0.4e (jnted in series with a 20-mH inductor, what is the phase angle at(0fn. tz 4ebju 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 srm.thr v+ / mnppl4bn++jt3r1eries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1rpt1rl3tv /n ++mmj.br+p4 h n500 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 with a 100-W rz+a 90l ncxe1b tpwq:ryb-s53mdqo0; esistor and 15-mH coil to get aoab +qml5y pt3 e9d0 zs:cr ;1bxnw-q0 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 wi p p4qx,yu8 pk*jbd*d4th a 450-mH inductor at 5000 Hz for a total impedancd*py p*ku,48j4bxqd pe 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 ,d.t t3ik4v7 * :nsfts-jsbea( 4bbwl series with a 100-kW resistor at 1.0-MHz for a total impebb e(-lbi 7askd:.4w4t* v3js tfts,ndance 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-mFxe 25,a 9ejnnr capacitor. What is the impedance at 109enr2, a5njxe 00 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 with9r)ksy o90g u y t 2rj,czsct2re6q,w5 a 10-mF capacitor at 1.0 kHz for a total 9ro 6,j t,)c2w9y yrz2kqu rt0ce gss5impedance 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 capacitor at 1.0 u xy1mv:r6q; eb:m 0uakHz for a phase angle ofe6qmbv0 :auy;1: uxrm $40^{\circ}$?

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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 kHfki( (9fqw, ms 0hyj/sz for a total imped fhqy /f0w9ki(sm,(sjance 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 qp5t3 ll0qyw,; v xn0uHz. What is the phase an5yq,t p0wxqnv0u l3l;gle?

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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, 2b:flg xl lc; ohbtka2d :155k70-mH coil, and 1.0-mF capacitor are connected k:dkba7;bo5 c5lxhf1 l2 t:glin series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor,dcnn yuywkl* /(f5 v:gh*dm, 9 a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. uny*f:dcy,h*g5 m/9( nkdvwl 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 wv*hn . (ukf18mlk3-ipd; ffd reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hzv fm8f1k.fdk;l* 3wn-(d pihu 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 circjhsy3 n4v4n7 wmvq(8wuit containing a 50-W resistor, a 10-mF capacitor, and a 0jnmn s3(8w4 hwy v7qv4.45-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 50s ms+ lm3hpo5g1g1+ pc0-W resistor for a phase angle om+3 pg1 1sms+c ohpgl5f $40^{\circ}$ 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 circuitjdt0-7ze9l b0b )k tvc has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should thet9bc0-db7 z k0jlv) te circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an a7.9an75 wm n/vhr9*rc9,ud ynf pzjgic series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivhy*nz jc5f r9dup7/na.n,r79 v iwmg9 e 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 y9z qd7sxswxvy- u350 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 imps,9d yx-evp7eq 0cw/ -r6 qyiz.s5wziedance of 60 W and a resistance of 30 W. What is the px-v i6yz sqz.q0 w-,cdp7y/9 i ewe5rsower 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 fo6p e6ne3a .yjzr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when con e66pnez.ay 3jnected 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 1.9 ebf.4iaw7fnah/z) y 0-mF capacitor and a 15-mH coil in series?z/n7ai)fh. f9w by 4ae

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor 9 /.0xkhoidrdfor a resonant frequency of 109oir /xkh0.dd 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 7 fqe7mwr2i uznop3s5 n:)a9k3.7-mH inductor for a resonant frequency of 100073wa )s:nnz 9q eu5 fim2pko7r 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 pldhxa58. cj(j vnm8 nj-aced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be8dh.vj(xam8cn- j 5j n 1000 Hz?

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