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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 ofhi x a+ nakghwqi3 oz4i:to:87;4ony+ magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inducti 3g0vcexek2bp-::5tsr/k n gbon 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 what kind of change ond-:gqrsa.2q62 9nr agb y l3ef the indu6- yar9b n qg.lger2sad2: qf3ced $emf$, 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 +czloens 4x7* wire produces what kind of change on the iln *7ox+s4cez nduced $emf$, 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;:9dl,rrfeyo nv tm58 ,-spywu1ah* u of a loop of wire produces what kind of change on the induce; : h*tmuo 85ep- ws,f9nu v1rldyr,yad $emf$, 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 magnhrnvc 4a4e gdt*db5- 0vf e2v;etic 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 in a cond yu;jz9uhp o7p)-wtw o1 jbc hx8:r59euctor will be that which tends to produce which of the following effbe-h xct9z):yupwjrwu 7ohpj 8 o 1;95ects?

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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 0qdwmj l*h8gu /dt:u*bar magnet is held above its center with its north pole pointing down. The:mg0 wqjh u*8*d/t dlu 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 horizontal table. syv./ j0,t -pd zifa96 .jdyx1cbbc2z A bar magnet is held above its center with its north pole pointing down, and released. byy69bic scjxpj210zt-.fz dd v/a,.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 a4ogot2z59t-mdez.ed pgb;tgy ( 4 f* v region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is t2- v*m o.p9 og;d4(4tdtztfzggbeye5 he sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level tab (vhbiqg0+ py48in0 umle 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 of the induced current in thip nv(0mi qbu048 +ghyis 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 /:9fenl1p w oza horizontal 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 ie :z1lnpo/w9 fn 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 horhp v7 ec;)v ik5lb*7lyizontal table and carries an ever-increasing curr veb*5l hyk)l7i;v 7cpent northward. 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 through a loop of bow ry,s.*d ;h4jckdt) zujyd ;ix :9-wire with the north pole entering first. As t soz9. ; bh, y-c4d:d* uitkdxy;)jjwrhe north pole enters the wire, the induced 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 wirztc k/ /)c/ek8thm) bje is rotated at constant angular speed about an axis whose direction can be varied. In a region where a unt/tm kj))ceh/k8z bc/iform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at consuq/ wvit71f/qtyq f* ,x5 svr7tant angular speed about an axis whose direction can be s/vy /qfti5ux*vwq 7,1t f7rqvaried. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law. 8v1x il8rc/zb
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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 thez, to:jvuzn3noy j0moqs. dd .y7-24 at 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 magn+x5uw19moclr o 783 9gic rjkaetic 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 direction) c3grh-uf -)o3ybv ra5 is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the )f-bh3oguvrr5-cya 3 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 veloci)82 gcuysme jsd* y v62ndr,837mirq vty $\omega$ 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 transforms1-jpelyk4 oq:. -km ir

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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 revolutions each second. The frequen k(czn+c 8kuoz rg5n2:cy of th rz2:c+k5n8ukng o(cze $emf$ 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 devil/n(y ( 9f xpt1wvixg*+ zes zdx1a23ice 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 devi c)vivf ay,3n,yo1-lb ce 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 tn9yyz6j /nzg2i 5k5 ujhe secondary coil contains more loops than the primary coil thennznuy/i9z j 52gkj 56y 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 than gfom l/v5.vshn+9p1c78p yrfthe secondary coil then it p1l5.omfy 7/ h+fv grc8nps v9is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpu w6ega.3,jfw jt

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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 circu/jkmg g z12mzs4 )asl*it,

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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 ind : pepm7d.svr)l46f iductor are connected in series to an ideal battery of constant terminal voltage. 7isd6.:depmpv4 )frl At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an idehe*lf9o)pb9uh6: c3pup uj *y ;p1r fmal battery of constant terminal voltag;pyp*:uo jfe396*9ubf)m1lrcpp uh h e. 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 rewciq)fc( 8f unc;.i5gzy(amx6. qw e7 sistance 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+xpoj/vga x.f o1-e62ua+h pb connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time conyx 6shpol2 dcu/qh*: f5 ha 7v)mi/6cistant for the circuit represents the time re q)dhs/ 52o hl v7af*6 muh6:c/xciipyquired 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 iax l20q0)w;zc ukcfvt ,t1o x.n series to a battery. The battery is suddenly removed from thfu ct.tv2w0)q; a1o lzxc ,0xke circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have theympamak2 nlo+6 6*l(w same 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 connected to 2s5qk;343 ;rhfowv f l kgx hii+9c*)zz x7bwgan 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 isjb 0u2p05zqmi4os -vij: joy0b4 y6AC power supply. In this circuit, the current jib:oi6 -s s0z vjo0u04 b24yjy5pmqi

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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 cit4bfw)xhbzy ci0 (s07rcuit changes by what factor when the frequency is trip h04f7zytw)bx (cis0bled?

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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 fh mbyh35h7igj4c l -v-8ddm9doubled, the inductive reactance of thl34mhm9g y f hdv8c-b-ijh75dat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an iincz,pa8/ z*u,v;kft nductor approaches zero, the inductive react*; /ztaipcz,,u8kvf n ance 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 supplypi9je s1 y2j gp)18rgi. In this circuit, the current9 1gii2p1p jgyjre s8)

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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 an8h wl ql upat vs-z/ne2),6kd4 ac circuit changes by what factor when the frequencz-huaeqv6s) l l28k4tnpd, w/y is 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 ck(3nv)mr r/ct0h -*i0l wad nqk1 wu4vapacitor approaches zero, the capacitiw(rvah1 w0cnvkr 0n*)l t-ki3 d/uqm4 ve 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 anglp b:glx-p +- defn5cp2e between the voltages of the inductor and capacitor in a RLC sel -d52bpcp- :pfgexn +ries 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 RLC48*wzlk a nk0j 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. Thbrc4mj)/ d ms*e impedance of the circuit increases if R increases. When is sbcdm *mrj/)4 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 qh 1/l;tglrl2 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 thegt 4)qm .n+hkw 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 capacitance both douww l:uwg v2ey6zij-nw x9ic l8;3/za:ble in an LRC series circuit, the xyzwl6wj3gnczu;ii9/ale - 8:wv :2 wresonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven0(ujle, * l hjuxd2-lf 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 circuin 0/cwmy.fod 2t 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 dpx8o qm,z7)e 4ulpb3a gf 1t/,k;uxgfield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic f fo3gebug7 aq, u4/zx)m,pp18tdkl;x ield 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)e8ay hh9 +8cvv8iq +ouzhh:uxzs)a7 field of 0.20 T. Find the magnetic flux7 q)ivz8:hyx)oach + sev hu azh88u+9 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 radius 0.10 m is rotating in a uniform magne:qnosbtw9 7b+i: io9btic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are9i o+b b:: tbnqswi7o9 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 arejry o whffp3e4 t(vlcx4m16:3a 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 changes 0f+-2asspzsi 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 9rt 8(nm ny hzjir;e:/xf vh/.square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the inducemfeny r;8/:nr9/hi . vhjt(xzd $emf$.

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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 avh;nvda h6(x+6w h atboo sh78pc k*96rea 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 areayf611,ze ot ct $0.20 \; m^{2}$ 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 horizontally at a shxe/g(. wk8olocation where the downward component of the Earth's magnetic field gse.o(/k xhw8 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 constsc z19j s1hlf7ib,v mo4ro9;gant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field shz;j ros99b1l 1m7gcf ,i o4vof $5.0 \times 10^{-5} \; T$. 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 generatort)rfnnna wlo0 3t(++v has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wi51e*2qglkp vw 99xk btvkngb7 2l:g9fre 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 4kppafkd-k8x -- cd4p. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis p--p cad4p 4k8-x fdpkkarallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ooi/6 w jld9id2bas0:*txzgab. p2 4tt f 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 construcxxi/ jxf- 1qr3t a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. xr/1 iq -x3xfjA 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 cb7.-zd7d;r kn on5d la 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 resista) ri:e4rgch.2vl 7+eh2xfw sy nce of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor hav t4vu9 93 gfwnu(rg.xre a resistance of 6.00 W. The motor operates on 120 V AC, and when nr uxg v(49ugfw.39tr 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 b6 fzk6o bx )uusf 3xh8e-fdth5q8x+0resistance 6.0 W is connected to a 24-V power supply. The operating current is o8 86fqtk x0xf- )3+u6hxefbbhd5usz 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 24-V power su2 k4bpxu i7a y9zkm,-lpply. The operating current is 1.0 A at f i2yup4-97az k lkbxm,ull speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V poiy3gyfe +rl :slp0,o:wer supply. The operating current is 1.0 A at full speed. What is the back ,:pi3:oy0y+lsglefr $emf$ 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 vn5+s 3m1( sifm jk+yteoltage 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 transfs-2q k5 iwg.pjv3dv b6b0rj ,tormer causes 14 A to flow in the secondary. How many ikgwqbdr,v203j5-p .t 6 bsvjturns 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 necessary in a 110,i .izhp9so0i-V primary if the 24-V secondary has 10i. izohs0 9,ip0 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 pb d,)twy / ,hqb;brdp;rimary coil and a 2000-turn secondary coil. If the current y/b, hrtb; d;)q, dwpbin the secondary is 3.0 A, what 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/id;o h 0sruko 2e-+bx transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondaui 0/r b+ s2kxood;eh-ry?

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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 b,hrd xwwdm -) nja- .5a*f.dfc1 v(ac7500 V at 10.0 mA. The primary coil operates on 120 Vx-.d5,w(*cfda1v j fah-nacbmr) wd. . 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 dwunl+6)jexsc5 b6n p//r:mel7 c0uw and 300 turns on its secondary coil. If 120 V at 2.0 A is applbj)6:sm wlx6ud 7lc+/5ncpwe r nu0e/ied 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 on its primary cvy w :5*dr2ax(,b oswpoil and 300 turns on its secondary coil. If 120 V at 2.0 Asyrvww5p, ab: o x*(2d 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 tra:7z;jaou j 3qonsformer 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 secondaoa;uj3o z 7:jqry to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.y4 4kbgix+q ( ;rz:ual If the inputu b+ak;xqiy( zl 4:gr4 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 turnsyrks8;po v 83r. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional lossevr3yosk r ;88ps)

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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 atxd6mwe4ct h: - 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 number of turns in the secondary if the primary h6mxh: dc-4tweas 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 gp,3 ukoviuhbyds ri ) t4n 7bim91 t18g,3v7iV. 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 th gs1ur,ik u39v1gdtio34n 8 )tihb,mb i7vy 7pe 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 curre-o8 ln*. ; ((vache g91bqwk dufabz/cnt 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 v 9-.anf( (u bd/z8oh l1bagwkcv*ce;qoltage 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 lol,e sol/4d7tsa m-7x lhnp*0z ng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with7pom,et s4a* -zdl/lsnlxh 0 7 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 resistancehme w 25,ea3jz of 0.60 W. A generator pr3e hwaze52mj,oduces 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;hufcm z6pnqm zo hes1*2y p 8d6y;k6: 1000 V. How much less power would be lost if the power were transmitted at 3000 V insteadc zh6n8 f6p y 6khy1omum;qz;2d*spe: 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 trans (is 275eentwdw -us56a ioo9hmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is a 6(sius2nt9i- ho75d e woe5wnot 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 az onuiz2nns6k2 83k-+/ fudkstored in the coil's -kdk236un+a2o is/uf zk 8nnz 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 d pz7mpg,so88-W resistor and an 18-H inductor. What is this circuit's timepszg,8mp 78d o 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 volo/dx2 8b4ar :*6.bf jpwk)eph nxohb (tage in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is thew1- *)8 pwp gkb9xbljt 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 i;udm2 :jhdd6ys the resistance of the lammu6djy: hdd; 2p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the62go*n7hes ci7ct.bf egs ,h6 peak current th7gchcs o*si6 .b,t2ehgef6n 7rough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power su6n ph.wi. stjjl)je6/pply. What is the power dissi6 ij j6w/plhjns) .te.pated 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 resistor isnu) ndj: .o cw-plk)v( $I = 0.80 \sin (240 t)$. 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 509 g1;r j9cbtoc rc.es--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 aei:i ;d*71 *tvumxyxw 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 of a 1 m/oo1wuvxk(ul l:ar 6plo* 0(.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 reactance of a 2.50-mH cocueq w5dte7 8 gn0 rfk71-5qjyil 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 inductive rea j xyp4jdute/q9:2xe9ctance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nf;ui up+u+:fei4i0 ir ecessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mHtdin7. evyd/;/(tomm inductor when 120 V AC at a frequency of 20 kHz is applied ti; ot /n(vyd/ tmme7d.o it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 6hq 73mip5m20uoi1tm w0.0 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 capacka0/eo3zuz3 bitor 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 Wic+eyp7z.6aszt szro ,m,bz - t5x3)s 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 capaci su7by8pf n,ta :agt+1vk.t g,tor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency willaz:slj0t)k.3f5 ea qy the capacitive reactance of a 0.010-mF capacitor be 100 W?y3 50tqfke):a.slja z

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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 tdbd:ig:e9l s8r e (fsgl8,*pi hrough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac serieslpm zf eujv,9a sg (,5ps**le32ntin 7 circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 *u ,ng n* j(m3pviza9elt2 psfs57e ,lW 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, kk nej-. o,w.sm,jy7djb(e1f and 1.0-mF capacitor are connected in series?j. e1jm(,e .kk,s-bdnoj 7y fw

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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,ozr*e wq 8:t/at5yv-p oa+ yf, and 1.0-mF capacitor are connected in sy8*- v/oato5p a:+r zt,eyqfweries?

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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 resistortbkiuq0ms5l7 nr2wet2 e :w,h s ;9d9k is connected in series with a 20-mH inductor, what is the impedance at 100qskketw22wiu09tsmn d 9b 7 l5her,;:0 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in serieo i5-9w-l)m; zoirg mhs with a 20-mH inductor, what is the phase angle at g9i; -o5rmzwhi)m o-l 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 khtt kjx 2v d2j(;g/) fq*w gaaov9zz5/p)8 ldwith a 20-mH coil and 1.0-mF capacitor for a total ia/djtxvgd ) t qz5k9kowvj ag2* 2l)z(ph8/f;mpedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following cap.6xi-vgxemf ,acitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 6x, mvgfi.e- x2000 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 beu0 08 :fe+a /uqh4j vvjdc1vhh put in series with a 450-mH inductor at 5000 Hz for a tot1fe h+8ahqu0d4 c/0uvjj :vh val 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 pulv:mhbp(2,p i rn)nn ;t in series with a 100-kW resistor at 1.0-MHz for a total impedanclnhpn) :b;vm(p ,r2ine 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.z(h(sxr8l2 gmweej 0n4-l ok4sgfc1( What is the impedance at 1000 Hz8sok w -gjx nm2404ee(lh(s1fz c(glr?

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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 ats5g3(e xl hmv; 1.0 kHz for a total impedan;e(gm xl35sh vce 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 capacitp:mtwe)7h tw3 -m go1tyouw;w,xq2t4 or at 1.0 kHz for a phase angle of t)wmw7 2m;ypx4 3tge1h:utwo t,w -qo$40^{\circ}$?

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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 )n ;no/q. inbu1.0 kHz for a total impedanc q;o/n)bniu. ne of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is thtzqf*tmp3c . t8 g;o57lcw omz8a-1j agp)xt3e phase angle7atjzamcc oxqtg38 zp 81t5*.;w)mflgtpo 3-?

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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, anw8v:hw dv-rc fu(-qd+d 1.0-mF capacitor are connected(u+v-chdv -fw8q : wrd in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF ca42bcd:p;avzm :hiwto ff6h 2(pacitor, and a 0.350-ff:64;m2t :c wbohhzva i pd2(H inductor. The circuit is connected to a 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 reeu/m( s)blhmg/x o /mne(72 yvactance 30 W, and an inductor of inducti(uee/lbmx o mm2y7 sh)v//n g(ve reactance 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 509 - ltruzrayw0 pb4,0n-W resistor, a 10-mF capacitor, arr9u0nw-b l, ap4tz0 ynd 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 t unf 0tgv0 8f2e9sjm+a 500-W resistor for a phase angle of j9t2usem0 t8v f+n0gf$40^{\circ}$ 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 hast27on yp1 8u x85didlq R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the cir7o8ly8qx5np u21dtid cuit 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 anb,l+uxiec g+: ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is egu i+,x:b+ clconnected 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 is 9 ,sto q7kt0ylnozo21$63^{\circ}$. 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 Wqq- yu v*0nm3o3r q0pa and a resistance of 30 W. What is the power factoruqn*033q mpvra0qoy -?

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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 circuixfw z( ov+0*sy vgu:v1t containing a 50-W resistor, a 10-mF capacitor:0 f o*vx1 vuzs(gw+vy, and a 0.45-H inductor, 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 mokl6(t0v7 u4l z 8sgpa 15-mH coil in series? m6p4(l0kltuvz7so 8g

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is need4)tkpy3gdfqn h ic0f1p/2c s 7ed in series with a 4.7-mF capacitor for a resonant frequency ofcc173p/ngf) iyfq 2sp 0tk hd4 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant freqxsi0 9 sd4va,xuency of 104 ixx0sad,9vs 00 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH cfa -rw8 t*xpo;oil if the resonant frequency of ther f-toawx 8p;* circuit is to be 1000 Hz?

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