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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 ox no0ut0.(qblib2uf .nf x)1) 5rwvtba.:z r jf 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 induction states that -wortq 5(xu-;f 0szwb/xtaq1 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 wha,l )3ay akcnpam7ol4pk.c 80w;7cz sff 1rfm 9t kind of change on the inducelm7f3c8mfna;o 1z,w7s9 4 0) akrkya.pl fcpcd $emf$, 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 thbczqjt u8l xhic499 jk.c ,:e,e magnetic field through a loop of wire produces what kind of chajx uctql,9e 9h: bik 4c.,cz8jnge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind olly*;koy wv 0n3ijy: kqlv380f change on the inducvk 0yy wy8lklq0 :vil*3n 3jo;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 magnetic cu 7h )v j)2g)crcigt.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 cwu*/ xma d1nk/urrent in a conductor will bew1a kd m/xn/u* that which 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. cwvurndg+u1 ) u060qd A bar magnet is held above its center wg1u+n )0ud wurd60cvq ith its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontcf 4q*ks:-6*ve etazeal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling mve**fs:4te qczek6 a -agnet 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 t oyleeu45)r4 ri g)1jso/tve(op in a region 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 this coil as the i ot)v41r(sye5)e /4r guo ejlfield fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fi*c w)-c mfwn4eeld vector points straight up. The magnetic field suddenly grows stronger. When viewed from abo*nw-ec)fm4c wve, 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 the ma* n:e i,9j ;6ok . azayphghjlwd9vg0/gnetic field points straip lh0ak/g:nido9 egj* .a6,h9zvwjy ;ght down. The magnetic 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 cl;i8,sow 2uw -4v+xcj sca5v kurrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circlev2c8x osc5l w-k; +ivjwusa,4s

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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 8ar2fi p x/sw::g.ljpwire with the north pole entering first. As the north pole enters the wire, the induced current will be (a.:pgfa8x :s l/ 2iprjws 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 angularnnc:( - - wc,lf xkwthp)1*qwx speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the intn xpw-:*q, w1h fw-)nx(cclk duced $emf$ 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 ab 5hyusm 6cxdgm m0l (0+yrcv71out an axis whose direction can be varied. In a region whec0ml yrug(h0ms1v6cx75dy+ mre 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.f ua0a5+7 kffq
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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 0tg t3k f9mmj;x39ssxan $emf$ 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 magz0fe op(w4xn ( q-;vhpnetic 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) is moved northward at ;-b n:ejp/lswconstant velocity through a magnetic field that points stjs /;-:pwnbe lraight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constt5h21ni 1boi;8dq,hg d+ds dub /pk* pant 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 transforms9kv6o gnua7ur, gn 7k-

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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 pqk 7z9k+1ve psecond. The frequency of thpk9zv keq71p+e $emf$ 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 de-th cr ec /4tk9an:4nqvice 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 device th-bf.9jq6a m nwat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loopk sy b-0 r8txylx.2qo(s than the primary coil then it0 yoy2 txrks-.l(xq8b 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 morecswmz5)isab k .3qj) ojo7 2.y loops than the secondary coil oi25s.jzk.b73q aym)jc w ) osthen 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 k4rb wp1 hi,4opower 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 +e3(xn.p.b2q rdhkejcuit,

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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 ,6kc-ty qjo1lan ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voo l-,jt 1qyk6cltage 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 serifofgo,hljq+;mzp9l 63 to7 k3es to an ideal battery of constant termiofq ;fopg6k+3ozl7 3hm lt,j9nal 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 resistance R is connectrml8/ pioot) 2ed to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected ,oroadmn 4d c,9o*lc(v,u la )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 tof.f s8 9wktyr-/qrja.0 (dghp a battery. The time constant for p.(sq.h9 0-gdrra /fw8t j fkythe circuit 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 cy;nnxjd1l31lm 1rc z n(;ukn1 onnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the n3(n ;zlyc ;urm11k1lnjn1 xdcircuit 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 s8do9fl9gma;6vx7 zp 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 sd5 bk6 +m;aydgkzonp .;; 2scjupply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In thzt1 2v+:hpr q0gd mx,his circuit, the curren +dth2zg,m x0r p:hqv1t

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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 ge7a57xt3yq-atpj . cac circuit changes by what factor when the frequency is tripled7q. 3xyt 7gcaaetj5p- ?

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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 5+(*mbb-pwdlt q j kbjc28y:ban inductor is doubled, the inductive reac *bb5btj+kqmw(lp28cd:bj y-tance of that 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 inductor approaches zz7iqzxhenmewls) g+,5: ) ciqg)f4+)q d0y ei ero, the inductive reactance of thaeid:f iqh 5cq )i))eg)y,mz ql+g 4nsxzw7+e0t coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the cur fqk.kvs*-qm0 dg*z8 yrenzqm dks. vkqg8*f0y-*t

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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 freqw:6oh0 op.a.pv icu,t dt6f2 cuency is tripled? :0 .6dh6cfvc.owo2uptp i t,a

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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 a t kg3ndupi3hsf0ny57e*d;/ i cross a capacitor approaches zero, the capacitive reactance of that capaci0dyeg 3n5;3/hdu* pn fit s7iktor

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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 an ex7xym3n/+ou gle between the voltages of the inductor and capacitor in a RLC oxu +7x/nm3ye series 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 RLC circ30sq9n lxp2ls zc tl:5xko ik de,d(90uit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incf qgts/tid/9: wdx -l*reases. tgixwd*9sd/:t/ q -lf When is 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 impedancj8y 4qd:ezfx.m; - qb4ou4pehe 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. Thexj2zh;d gzh.; impedance 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 capacitance both double in an LRC series cirgf+- pd/i( 0yryzuz4ju ) /gvpcuit, the resonant fre(ugr)/puvp z/fz-g4+ jyydi0quency 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 driven by an AC applied voltage. At res rlu k)s)w2)buonance,

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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 +ad-f,xiw :c53v q.nc 6zpalpwhen

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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 rotat-h+s 7acu/y atriv.x.ing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetiav- t.uiyr.a+7 scxh/c 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.*diijs+ , lbm010 m is rotating in a uniform magnetic field of 0.20 T. Find the id jl ,*bsm+0imagnetic 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;tu8t-e ,x;z fwwfiuy,*ey:w uniform magnetic field of 0.20 T. Find e t-i8fezt,w:yw, w;u yf*;x uthe 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 l(l j3lic-l okx)0dj-zoop 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 change+a u ae9y1q*yjbdm *0ds 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 cm. +y*j1a zri5k r A uniform magnetic*rrj+kayz1 i5 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 1twwv8( 8viwdszt-h(2 5 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns jj5b)sk e:w-l+hh ;ymand 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 horizontally at aov9c32t z v+si location where the downward component of the Ea vsc9it vz+32orth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rr6cm4lu9- h8u9pfjvt otates at a constant angular velocity of 2.0 rad/s about a vertical v 8h9 uupflt-cm64jr9 axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area o hbyw eenpa5:wjm4k7k f88c/3 f $0.25 \; m^{2}$. 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 ev0px ry k 91nbdd8okty*54.m100 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 lrs k ws6luy:q7r8q*t.ong and 8 cm wide. The qwyu.sl8qktr*s6 7r: 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 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 6tv- j- k-p+ usaobmtb72b 6uan pli9f1y.mb, 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 simp w ww y1tj/d/t/oy -si6)enl5fle AC generator with an output of 12 V maxi6ys1ot5wf/t/dj-n ) y lwwi/emum 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 generat-p;js gm/d: gfor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operzz.*s7i,h6sev xi)b mb- 2y/7apwtap ates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on 1 kn(q-9ztuqn /2(qn -/kunq 9tz0 V AC, and 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 connectedcs f /-af:lr*x to a 24-V power supply. The operatl/fcf-ar :xs *ing current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2jxk3)lt2 pt x)4-V power supply. The operating current ixxp2l)t jt)k3s 1.0 A at 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 resistance 6.0 Wfv/: sj hr-ol: is connected to a 24-V power supply. The operating current is 1.0 A at fl:ov:f-/s jr hull speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to redu,h, abyc5qb/ qce 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 pri m. j0fk,wmwix/hwx16hyu,pwn y 6l21mary of a transformer causes 14 A to flow in the secondary. How manw6wuim l1y,wf.njx,h 1xw02 pky6/ h my turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessat- :-yyb gt5txvnfav*n2* ai*ry in a 110-V primary if the 24-V secondary has 1 t5yx av -fi2-tn:n*tv*y*abg00 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-tur jt6zv ux38ae-n secondary coil. If the current in the t-vuxe8a3 z 6jsecondary 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 transformer. Asd;dp8(6ymfjuc/ eki0tuo( t 0suming 100% efficiency, how many amps at 24 V can flowje0imu6od(ut k/ (8y dpc0;ft 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 signupu e+g 98nl,t fih6wkezt2-5 transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draluit2 wn k8e,g hz 5-etpf69u+w?

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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 pri8s-/0swo vmli j,ixv o.q( uqqk:1kz7;mvj -u mary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, wha. -8mquvq-: zu1mkl,xjs i j;vwi/vok(qo7s0t 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 coil and w pp dfx6th+q,kdz0+i.brwfk4 .e2a9 300 turns on its secondary coil.,ef wft06kp+d+. p zk b4awir2q d9.xh 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 itq n0f8jlwwm ;x(b2;;qbc ur 7fs secondary has 200 turns. If the input ubl; (;frxc0b7mn2 w8qwj qf;current at the primary is 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 transformer2c/y +x xwf4mx has 100 turns and its secondary has 200 turns. If the input voltage x4x/cyf x2m+ wto 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 c isp7g)fj7ewf*h t 1/ofd 6p * hj1(d72xvqke200 turns. If the power input to the primary is 100 W, we can expect the power odx2 j( w7d jeih*hop1q*gv cfp 7f7)f61s/etkutput 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 voltag:ol- 8,i1r:21b h; ioj kiv6pwlovw fs0l ak7ge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. ilo;k1j, v0lwh iif7s ov 6w: lb:p1rgoa2 -8kFind 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 Afa v.r1yn1c enemx .)/o 1dir:jj,vgh 0+6ov k of current 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. For)n1v. d+6/eogjkm1 ,c h.v v1: eifyanxr0jind 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 60d pr)hauxr eeh;j96.* A of current 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 9r)d6rpj; exa*ue.h hline 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 0.60 W. A genera:c5:bbet/pm9cz nj6k tor produces 100 V at 70 A. In order to reduce energy loss due to heating of the trane:tnc cbm:kzjp 59b6/smission 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 c5m-x 0.5sm 7agv-ru0isray lof 0.60 W. A generator 70s-ur0v.mimya5-5 raclxs g 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 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. Hot-ys b7- e-cq/i 0vdodw much less power would be lost if the power were transmitted at 3000 V insteads vtb o --/0d-e7cdqyi 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 ihn xn.:-xqjhj+tl*+l- b+n c es 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepp c *+be-.xjnjl xth+hqnl+:n-ed 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 cj.: u3uxelgleu-;hf 2o(* urj*fgf7 A. How much energy is stored in the coil'se of*2.reh l*l3-f:juj gg7;uu fc( xu 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-W resistor and uj/fw ) oe-.vlbgf5nyg1 vj2*an 18-H inductor. What is this circuit's ti.5fjg) *uf b-vewyv2on gjl/ 1me constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 V?g fcbo;zyr3v b95fd0l8b/l ( y

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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-Vb3(qg/rsqlq+vc+, dmqx :yp- 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 1piabu9t 0hy a 1 nn/8: p9w*wq(n:vatm20-V AC outlet. What is the resistance of the lampwh u/ip:n98na01a*a tqynm(tv 9 w b: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 power supply. What /i+j hm :e, 6bb(ijvu)-zwdsb is the peak current through the resistor?)sew , id+6iuz-bjb/j:m( hbv

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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 t n9nv:cf 1 s-5dt.sa3udua+) yg4jmigo a 120-V ac power supply. What is the power dissipated i9agydjn4 :+ fcv snt-)uig 53s dma1u.n 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 reskw1 (n4pnu ibbg4+ vnze4*e60p 4bakhistor 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 resis0*t+g xa27f/ kd hn;xjee sqv4tor 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-t3q n,3a)2n itczh uq)q (r7nsW 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 1.0-mH inductd 8m+gjpk.8 r m;gvz:c,pma 4vor 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 coil at ol1 bj- *n7nnc1000 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-mHtr82k8ur 61 ;lesy yxv 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 iz7+9q + t4s .7mv +xqxc3zxgw zha0vndnductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 12v tc,1, ine-+4aiygb g0 V AC at a frequency of 20 kHz is applicn,it,beag iyg4- v1+ ed 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 2.50-mH coil due to a 110-V, 60.0 Hz source?o exouub( 4/,hecgs3.b 9oh:gk*q, yk

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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 capacvq w6 fzklbu9k3 :0e.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 hao;y3udvb 9s*jv r1u +ove 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-mFwaa.bo jc 3:vi8jg( 9k 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 will the capacitive rea5tdk7-w cf ny/ctance of a 0.010-mF capacitor be 100 Wf/c ty wkn5-d7?

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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 capwrm40 t 7k tcir3lozj0+ha/7cacitor 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 impedancfg6-t36zyb rec 1 zre)e of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive -bf6 rr3z)6gete1z cy 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,f8pp s5kv m-v-dt4 tt coil, and 1.0-mF capa tv4f t kp5,mtp-8svd-citor 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 resistor, 20-mH coil, and 1.0gcuz7+2 o0roor3uj; gp-z3 n9crjt *z-mF capacitor p -g3z9z7r t+oucjzu3 g or0 n2jc;o*rare connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-oyvp+l d ur 0o0c1.wj4mH inductor, what is the impe00vdou y.lor4jwp1 c+ dance at 1000 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 series wim 8t* .6z7v*g8 1,w.bxpgprnt (9ei bqhrg euvth a 20-mH inductor, what is the phase angle at 1irxep7v*r u 6*(,w.tg9hv gen8 .g1bbtmpqz 8000 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 si* p:d+t y 7*mqoydrixu)y2+in a series circuit with a 20-mH coil and 1.0-mF capacitor for a tota mo2*dsip+yrtqu7x*d)i y :+yl impedance 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 capacitances is needed in seriesf lky7h6/rqol; a-e,z with a 100-W resistor and 15-mH coil to get a total impedance;zfr7 ,kya qe6l-hl/o 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 49r2jvq uhyy /*50-mH inductor at 5000 Hz for a total impedanc q*hj2y/r v9yue 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-kji; u6tpc88f tix3v/iW resistor at 1.0-MHz for a total i;8tcji8 36vfut i/ixpmpedance 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 capacite2 (1z0lprpqqor. What is the impedaqp1(0 zpl qr2ence at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kr,k+:s 0 tbdjpHz for a total impedanr0js tk+bp:, dce 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 1nv ,qd;8o4l c g6(4p tqrrdk9r0-mF capacitor at 1.0 kHz for a phase angle q, qkv 8p6o(grl4tdrrcd;94nof $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is need8)b niia2jl(on6d- t sed in series with a 30-W resistor at 1.0 kHz for a total impe( i 8s6lnno2ti)dj- abdance 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 120y/szh )x (mej- Hz. What is the phase ang y(j -/)zmehxsle?

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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 anby06 fnk08m.vkss q; 100-W resistor, 20-mH coil, and 1.0-mF capacitor arv.m0 sn 860kfqy;ksb ne 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 consists of a 1 t gc-r9i:jfk 9z1u*yj00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currru-9*zyi1fj9t :g c jkent 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 capa;fm 2l qemze86cp21 lpcitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are c q8z1 ef6e2cp2mm p;llonnected 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 foe sr91r z)c0gy + hfjy(flz9-hn 4tj2qjoe;l7r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to )-e;j0yrs 9lgqfzhlfey+cjz rt7jo2n1(49 ha 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 necessklhxlo 30j :+db6c s,hary in series with a 500-W resistor for a phase angle of,bdlol skh:hc 3x+ 6j0 $40^{\circ}$ 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. At what m i3 4uc)xlwtqo10j s)frequency should the circuit be driven in order to have maximum power transferred from the drivinwxm q4)13lsjouti) 0cg 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(z*new9 tgwl9 in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-Vw9 ewl*gn tz9( 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 cir2;*ahe,tkq:6-o sxlbqj z.ugcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W.gt5mh2 r kb8s7 What is the 72bst8 k hr5mgpower 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 52, z.z3kjlfwh 0-W resistor, a 10-mF capacitor, aljh,3.wkz 2zf nd 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 pwh098 v.+mj +umcq szec:h0p and a 15-mH coil in series?+h szmw9p8qvec+.pjuc 0mh: 0

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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 a9p5y9uhh /hbt 4.7-mF capacitor for a resonant freque h59thu9bhp /yncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needeczgbka1:r347;i0bxkgh 9v xo d in series with a 3.7-mH inductor for a resonant frequency3gkbic o h1x x 4:790zakbgvr; of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor at,vnpq8sv 9bv,:os s-nd a 40-mH coil if the resonant frequency of the circuit issv stb8q-o: p9vn, v,s to be 1000 Hz?

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