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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exci ;8yj 8locv5iept

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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 thahahpvzaar tc*- :pl b;9a7)s4t 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 kinb4(--jm jg e03kfgg hw;j/l zqd of change on the if(g- 0 /w;emh3ql-jjj 4gz kbgnduced $emf$, 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 produces 4dvtmz,d) o)06y6eyuy:awf 8mnk 5qa what kind of change on the) )v6ay muoyy qnkzmwd,f8a5de 6t0:4 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 am c: dyqn6t8sr2*20: sqinbdv loop of wire produces what kind of change on the inducedsr622 :8dd*bsn yqmn0tqcv: i $emf$, 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 fvbp1cm8z; 7t :d ilgr5rom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, thdxoko1 0.(mso,rs (1e1p ploeee5 u /je direction of an induced current in a conductor will be that which tends to produce which of the l10se1k soxeo/o(, 5up .o(m1ejeprd 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 +q7;oo2h7xqu ho rjg :is held above its center with its north pole pointing down. The stationary ma2 x gh;ou77ohrjo:+qq gnet 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. h*xp/4am g du3 A bar magnet is held above its center with its north pole pointing down, and released. As itx/*g3 had 4upm 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 tabl2x1*k8 c 7 dn/rlukbtee top in a region where the magnetic field vector points straight up. The n*/b7kktcd 1r8 2eulxmagnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level tablufwi*kr ,htr.1dukv+l t 49e 2c7nlb 9e top in a region where the magnetic field vector points straight up. The magn*uhvw.utir cbrt2,l9 kld+ en9f 417 ketic 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 u4kbq1r1 vn/ nxjza1el-.ej -top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whxr1n 1 4qj. vkue1-ja-/ebnlzat 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 ca*v-;x39 wh (rgkgmw.p 4md extb3)rzurrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curr *k(x;v9 3wawhd3x)b.tg4ze r- m pmgrent 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 enterlg u1hib;b8x2kn4m9 n ing first. As the north pole enters the wire, the induceglm4k;8n9h i 1ux b2bnd 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 constantk1 h, csfg) agq+oe xo/o4kz8( angular speed about an axis whoseao+/xh k1)8(f o,o e cg4sqgzk direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 adhee c chx;bav *s(;9xn409 xqbout an axis whose direction can be4( h 9d0xhbs;qe;x 9e*nca cxv varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.abif.2d/pvd3 x0 il+b
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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 anllc nrw2+q*lo xa8ygxd)t,21)+mfi u $emf$ 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. rb*;kh:b )8wo io0dr p 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 moveebd*dnqr(4s0hwg3gz i5bu ( p3 /5xm qd northward at constant velocity through a magnetic field that points straight down. Make arm (igp5*x3sd(g w zh5u0bqe3d 4q/bn 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 ang57c,j6lbogvm ctd 6t2 d-2xsy ular 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 tranix/ r7,s56imu bq 5wh rt+pst:sforms

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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 i;i f.hp6 dk+xrevolutions each second. The frequency of ti.i6fkx h;dp +he $emf$ 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 devicnvm:4h *dl0xz e 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 devhje1l wh2d6z4,4z s xxice 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 ha7arq892 fk fcontains more loops than the primary coil then ihqafk27 r89a ft 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 vt( : ) 1n5vmme.cxctfy/xvo. than the secondary coil the x/ocvntt1c5x v .( vy):mmfe.n 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 pow;o8w5dv k+ g)(branaw er 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 cirw 7/if.4.aqa)ndu hdbd (rd6lcuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of conso( edpskyuq/ qc39a 1qs(a-q6 tant terminal voltage. At the moment contact is-(/ oqqdq aspq(uc 61ey93 aks made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of con,a 7vznsj rp47stant terminal voltage. At th ,rp ajn77szv4e 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 resistance R is cp vgyb**5p 0itho2n/ bonnected 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 Lxjs4jyx)udqg hser*l9 6 f:) : and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectog77/c /axij68ydgj8o7 psd bev27vged in series to a battery. The time constant for the circu6bd i v7//ap7vogxg 8gysec27joj7 8dit represents 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 b :suibq*( u)fzattery. The battery is suddenly removed from t* zu:(qsiufb) he circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excgx ) :uukay.ly b-;)+hbps* msept:

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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 j((u kwtibmlg5 vy6,,supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC phu6r:,-ja 7 hvke *sjjower supply. In this circuit, the current7,- s*uavr hh6j jjk:e

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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 k;fu:z .+jfhsvv58 cx what factor when the frequency is xcjf:k 5; u.zs+vhv8ftripled?

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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 ind-)wmhuyb l olar*8/5k uctor is doubled, the inductive reactance of that induc8 / wok)br5a*h mly-lutor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the in )*vodqf rlsoz;y;co+-+;6 kifk a(oiductive reactanc k ck;oi;+od o)av-rf6o+* ;zlf( siqye 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(ebf e/* i j1reen5wnhs+kb5 4 AC power supply. In this circuit, the currentre*e kn51i5e h s(/b4b+njfwe

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the f u c ;agu )hlu/)yw/dr7.thji0reque ;/jyi)h cdu0.tuhlgaw u7) /rncy 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 capacitor approaches z.kyh m:4y0gdoero, the capacitive reactance 40myok:g.dhyof 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 capacitor in a rnpmh sbq5m27h,0af5 RLC series circuithnp r0f725 maqm,sb h5?

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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 a79oz. 6reen ;b:* s.vta qfueon RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increas +n;z h*sux c(a7/bb6q4srb bses if R increases. When is this statement tru+ bcub 6sa 4 rss/(bbnhxz7;q*e?

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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 4 c+5gn/w* ohc7 *lnj gybgv:eimpedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cij4f7wus49c a2:b ; kkduooyqmc65r d) rcuit 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+1ubkl eal:a; the capacitance both double in an LRC series circuit, the resonant frequency of thata:1e+ull;bka circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage.apyu+ygs665 c 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 occp vnpu9awc01 7urs 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 .zc3tcunbudq1us8;12c+f sd u1d 0ef field of 0.20 T. Find the magnetic flux through the loop when the pluntbcq 1+2e cs.f0ufd1uscdd z1;u 38ane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20 vyvr;kpjh)yhd a6 ++(( bunysb :oo2) T. Fyrv hb)yd6bva+o() :n2( pk+jhu; oy sind 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 radius 0.10 m is rotating in a uniform magnetic field of 0hb gfw3e+sd v *921bqz.20 T*f d9gb hqz31bes2v w+. Find the magnetic flux 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 reduc3sp t/ (fnuath6s9,xjx eh5;,o0- f , npdraomed 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 : ww5 dddpb+vny:+ r2mchanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 c .dsff. 3gj2xom. 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 ofgdxfsf3 .oj .2 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 area of .o )o8s wp,hz9vqhi7y $0.40 \; m^{2}$ 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 alz(teyf0e7 1m k 1aqh8rea $0.20 \; m^{2}$ 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 horizontally0v is ;e hc9t8odbj mtlc71i3( at a location where the downward component of the Earth's magnetic fie09 mble d i;j t3ch71ivsot8c(ld 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 consgs.(vuf; it* n5 ck2ljtant angular velocity of 2.0 rad/s about a vertical axis through v s(5c2fl* nt.;kjuig one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loo42khmalidk ;u4l3zd vizk/ 5-ps 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 ofaf fgew/8)w:uk x4z1,0 vigs 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 $emf$.

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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 12 cm,f, hxjrkx, 1o 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 perpendifkhj,x , 1o,xrcular 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 oem e*z0nv7.iokb q42hf 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 o+z5tqgytka itpib o+sr) (i77.2ly, f utput of 12 V maximum when rotated at 60 Hz. sokp77+aibyz(52yr, gtfl)t + tiiq. 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 mcd 2hszplv5:ji .l0x *aximum $emf$ 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 motor8 ir*q:eg eu2m 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 motor ha w.//ga4sy6 ed/xknj zve a resistance of 6.00 W. The motor operates on 120 V AC, and whenje4yz6s g.w ///xkan d 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 re 1jy-l6u6;:krjty6wpq3fn musistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up y-lft 6umyjnp6jku : wr6;31q 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 powe0 32wd pnzi:djr supply. The operating current is 1.0 A at full speed. Wha3d: 2jn0dpziwt 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 j,7gl-qg 1xg yto a 24-V power supply. The operating current is 1.0 A at full speed. What is the -yqgl7 gjgx,1back $emf$ 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 reducy2x2o m*h1pwxv5q4 ic1 olls5 cz79aie 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 transformer causes 14 (l*gldzrq1 9m(qp0uhe l 15 ziA to flow in the secondary. How many turns are in 9m0(h u*pl5ld1eqzrq1l( igz 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 11p xab7a/pj- r1r ex3r40-V primary if the 24-V secondar/ a ppa1 43exj7r-bxrry 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 secza(a wf6ei1 e-ondary coil. If the current in the secondary is 3.0 A,a 6ef-i(ae 1zw 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 transfh mel*n8ix/j/9j)pk1 qehm5l ormer. Assuming 100% efficiency, how many amps jmmp *jxknql/he)e 9/h158liat 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 a neon sign transformer provides 7500 V at 10.0 mA. The ci*ex:zl a)4e;iq/ ) *mxpeup pri)*xpz:/upm;)e4x a i*cqeel i mary coil operates 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 turn( h ggg- -urwcnu+drhznv1ry1b7hob/c4( 2 r7s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is apdu7ughr bn- ( y42cr-hnrg7zw +rbc1v h1g(o/plied 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 pri2pgq5w5t(+hqrm x 0kxmary coil and 300 turns on its secondary coil.2wqm kr xt05 xqgh+p5( 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 has 100 turns and its secondary has,j5 iyib9 1h4vblo:w s 200 turns. If the input current at the primary i5,i:s9hb vw jb4l1i oys 100 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 secondary7kr y uy6gi6*m has 200 turns. If the input volt6um7 gi*rk6yy age 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 a a0 peah)w3a1end its secondary has 200 turns. If the power input to the primary is 100 W, we can expect thee e)301aa wahp 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 60ycf)r*6 ni i-khc19c.o6)dpj kn *fxn A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and ckxp6d.ncn )k h o** 6yj 9ifcfn1)ir-transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usua2rgdi:x84 lra lly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. 28ldrx:ai4rgFind 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 voltage is keb*j8m j(l 8dpejp8o9. 48pnmip ;bjusually stepped up to 4500 V by a transforpbpp;8988 kb *npmjlo ije. ejj4dm( 8mer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60m,y3xtn we7bk:w.q o 4 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 transformer with a turns ratio of 100:1. What percentage of the original energy wo. 4mnq3btx: ko7wy,weuld 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 ofmbvn;d :*v;.qf8j fld 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 transformer with a turns ratio of 100:1. Wha:q*f lnb;d;dv.fvjm 8 t 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 less power :ei0rz i0/ j*t-rwh v-r(zadh z0ukj5 would be lost if the power were transmitted at izwriv/0-jkh0 h(ute zz:rr5j - 0da* 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tv4md3n77g pber n).bsransmitted on a line with resistance of 0.60 W. To what voltage must the gepgrn).73 4vb emsd7 nbnerator 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 envyk i4:ty6zsbow --4r9ip3p lergy is stored in the coil's magnet4iz kv r-3tpwyi osbyp9:l6-4ic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an1sk--ih ycx )s 18-H inductor. What is this circuit's time con)sk h1 -cx-syistant?

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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 0hxq1wd* bf 5zc+-fq9.xu bouAC 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 78d9-oqzik8l*fw:ix5ph i vm 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 ie3ctcd0 34rpz s the resistance of the lamp? c0 zed3ptrc34

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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 1 7a wz99mb dey;owcxsc r(t(-* g 0kzl19n:pvg20-V ac power supply. What is the peak current through-90: cw9tnr1xedgvg ;wm(ac9sbpz 7zoy l*(k 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 ue1kr7 bw92rc power supply. What is the power dissipated in 12kce7 rbw 9ruthe 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 resistux ;z ooxo+ib(p;j1q4 or 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 resist z5iok*vm7 9xfor 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 5wuovig p+(l195 3gh-qv ) 3carxfb; gj0-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 1.02t:n2leo x -xw-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 9sgy2+;) 7 lcd(s.uw zzwkfll2.50-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- z+ (;kscri490vo xvc6rmgca 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10 8m( os8egi.ysy;aes -00 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequencyl+ui nb(r q6ojrj: 8i3 of 20 kHz is(3uj 6i+o rilr8qjbn: applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.) 9zc*lb*ktmf/8 g *hlyv,xcy50-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-;0p2q 5vneqnahrt- l a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W v*qeo.go c*ao4 0;mjxw o4qj g:s6u/jof 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 2z3 aa mffxa57a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wilkpaybbp6 dm7)l ekqre);+h 1(s(s f avpw5e./l the capacitive reactance of a 0.010-mF capacitor be 100 Wbp bpyk( a) v6qes (5rk17/ael).e+dsph mw f;?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?2vl*hxez2 q z8

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.rdj5m1 si azk3 x5ky.00 W inductive reactance, and 10.0 Ws31jzmxa50k k. ri 5yd 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,cnsw7 + qk+g2d+kta / ci0tgivo8am 3 coil, and 1.0-mFtwc,ivikg+k 8d0stnm o+aa2 c7/3+gq capacitor are connected 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 4m)gx7ok 2 tscw +(xgw)wz 2ewresistor, 20-mH coil, and 1.0-mF capacitor are connected in seri2smz )exgc4gx2+ k ow7wwt)(wes?

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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 connemqlckq 0r3u g,4nscp. n+w:l0cted in series with a 20-mH inductor, what is the impedance at 1000 Hz.:, g0mqcr un 4qc30snwlkl+ p?

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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 connv3, r(uy4tl owected in series with a 20-mH inductor, what is the phase angle a, wu34o rvty(lt 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a snu9a*4g qh 4zi.8mi e20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hzgem8zqi s4*4 .uhnai9?

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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 needede+7iouby9fd5c7l 1kf6 0 dvu xbvwi63 in series with a 100-W resistor and 15-mH coil to fu6f + livx3edib6bu k5cw79 01yvd7o 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 45,mj z(sqo: )zb0-mH inductor at 5000 Hz for a total impedm):b(s, qjzo zance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at m76 v1n 1kruqj1.0-MHz for a total imr6 1jnk q1vu7mpedance 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. Whatpkswq.o6 o9;4 ezl- iv is the impedance at 1000wpo lz49v-oes.kq6 ; i 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-mz ;rb7r j,q9cum7y:wfpnw3. b5e o yo7F capacitor at 1.0 kHz for a total impedance of 45rw3r 7myjw7:yn,9coz b u7. oe5pfbq ; 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 kHz for2bkiv2 b j,t+m a phase angleb mjvkt 2+2b,i of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz foo -,.cdbfkmex/f-/x( d3eyi* ld;v jlr a total impedance of 45 *(lyi oxdf,d;fc- mx/e. -vdeblkj3 /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 10z 5b 14r2podq8ljpb8z0-mF capacitor at 120 Hz. What is the phase podjl2b 8b4z q1pzr 58angle?

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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 rj*vetalfd: h 3q3g;v ,esistor, 20-mH coil, and 1.0-mF capaci,v *: ;jdtfg3ha q3evltor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consm7p)nal am;3ac qsv83g/m,bf ists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a c;g3ml8msa qb3vp 7) /an,mfa120-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 yq r7l10 lkn/r 4kjnc(mmf;i /capacitive reactance 30 W, and an inductor of ikl4k(/ 7 r /nmq;y0nlimj rc1fnductive 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/)dn*t* kpd2j2dn vlk circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pown2k d)/lnkdp j tv**2der supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resi;wia9+ e-kq spstor for a phase angle oi qea;s-+w kp9f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. Athmp pjj8 +e0u2y55hty0:y yaj what frequency shouj 0 ypyjt h+h:p80myeaj5y52uld the 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 ac series circuit with 12.0 W resistance, 15.0 Wzq bi.64of*tpn ,(dqk )kthm0 inductive reactance, and 10.0 W capacitive reacok h ,fpi*4qn6q )mtkdb.z( 0ttance, 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 anl 8j 80in)aysa AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and b 6fe:a4nm0dblo ,b.wa resistance of 30 W. What is the power4 o:nl b wae.,0dfmb6b factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistyv13iy qj9 go,h:gl 8eor, a 10-mF capacitor, and a 0.45-H inductor, whiyl e91hy :vo8qj3gg,en 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 2g.njw : x62l 1rsvqeo1.0-mF capacitor and a 15-mH coil in series?6vlwjrgo n1eqs:2 . 2x

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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.xcpa py; 1;z0,aehd r:7-mF capacitor for a resonant frequency of 10 ey0,r;pdx1 ap :hzca;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 f mi5 6sg6vsu+drequency of 1v6 6smg5d+ usi000 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 4w5 ;)pnvl hv/ m4+4s-si9 vreg(t kkxy0-mH coil if the resonant frequency of the circuit is to v;h9vevsywxt5k+( /i pml4-sr )kgn4 be 1000 Hz?

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