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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic : iakt66li-xn ; uswd5flux 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 thec,pch r6//o ntt jk1 g9)*zei7fz na:f $emf$ 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 qbl )trhuayfk 1 h;.3 d(h0ul2a coil produces what kind of change on the induced lqlfy (0) 3bh .uu2d1;rhah kt$emf$, 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 fib g:0) netsnr cdgvlp3 zr5j0i99a). yeld through a loop of wire produces what kind of change on t rs pt3rnjdv0c05gi: lg)9e. 9a)nbyzhe 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 am7i44/ep/kpe6.n 2rod wmu g j loop of wire produces what kind of change on the inducegi4.mn j e64d wpp2rm7kou//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 magneticx:isp*f,w )lg 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 opia o(*d*e/ctxt -w:d f an induced current in a conductor will be thax:/d (*t-p*edtowac it 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 d,lejm hk(kupnkhju0v j2 .zq:+q:/+. A bar magnet is held above its center with its north pole pointing down. The sta/jpkz2+hjh.jdk:quk:u en ,v0 q l (+mtionary 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. A bara q, n:akxp08k4socwy4m+x 6q magnet is held above its center with its north pole pointing down, and released. As it app aam4q y,ncokp x48:s0w+qx 6kroaches 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 tabl5t, )fa7r8: aypxcr ele top 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 pt)ar,:8xle5 yrca 7 fin 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 table topg4/knv3t;fi g in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what igf4gk;vn it /3s 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 magnetic field f48ycocwsysbd/, 0z,points straightsby 8c 0c4zf,dsoyw ,/ 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 xe,hvnu d )l00carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inducdel u0 ,xnh)0ved current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nojeyzvde80 6 uxm(f 52irth pole entering first. As the north pole enters the wire, the induced current will bf(eu2dyjmx 68i5zv e0 e (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 rw 018 6ps4quujnz bp8qotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatiob 6u8 uw81qqnp0zp4s jn 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 colb q(.kvt1y 0ir1j)t g8yee/ wnstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wvte yr1i /1)(y.b gtjq0ew8l khat 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.j)eb /rkerq 35qxc, .v
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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 tdqm lbuaq;p b31)k /l2hat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fieldn;qa 97 w8hrbu. 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 no*90ehrs0yf vf/ky k8trthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentivse00y9/frk ht yfk* 8al 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 rot m60)*n1jiwnt9kbxf4g6ii bx ates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transforms3h5yef 44nmrwmt: +pb

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotat1mg 6 3yjag6vlsz b0l0es through 60 revolutions each second. The frequency of the 60lv g3zb1sja0 ygl 6m$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tujyf 0 tmdy 3v*(i42e gw/3yfro

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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 thxgmt) x:g/p1 5igttuz0c42qf at

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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 loops than the prj, :go:nal,t qimary coil then it is n a,qjt: ol,:ga

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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 contct.5 5s kh;j2u gqjn3pains more loops than the secondary coilqhugj c;p5s n52kjt.3 then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powersad taoo fk5o4ow*93(js sr21y3cp7l 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 circuuz 0syeoggh( l 6ub*+1it,

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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 a 8bw 4 uhxtxav3*u03iun ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acros hxvix3 uwu03 t*4bua8s 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 svgfb7vu( r7.s394lps22hx: ymhqrj p eries to an ideal battery of constant terminal 3 r gf(7vl4sx:b 9.qv msy huprp27j2hvoltage. 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 inductancyd4g 4v,t c3 cgx/dx1ve L 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 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 i/34liug 8dqdsnsywsr v7ok-3l1 a)(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 -f+uwcu+8i6 mgi7 7fhk-w lkqbattery. The time constant for the circuit represents the time required f f-u-i+ku fmiclw8wg qh7+76k or 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 9dkqt6ay0y 8k x*q5h ifvws9*to a battery. The battery is suddenly removed fro*vyq5 dysxt8q* ihkk06f 99a wm the 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 hav)1zpk sxqpppb9at;chs a9h 2m9 6t:; ue the 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 an AC power surg6)jj3 hu jpe;li*g)g s3xh5pply. 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 this circuitfgqctn he5bw)i/ 3/w) , the current/5the nq fiwbgc/))w3

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance npi75 q5cr uz;in an ac circuit changes by what factor when the frequency z ;cr5u7np5qi is tripled?

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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 doubled, the(r.b wg,8wl wh inductive reactance of that indgbww,lw8.rh (uctor

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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 vesc)v0t3yg +p oltage across an inductor approaches zero, the inductive react scy0et )g3+pvance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, th6hg; 4v /7t7l; dr2w+qomcbkhf x/aune curre7hfbq g vw67oudcx +k42m/h;rln ;ta/nt

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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 ad54 vc07 mpsgip ./tzoc circuit changes by what factor when the frequency is 7g.vpdzc40i m t5so/p 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 zero, the 3:bfj2p)ly ercapacitive )pyj e3bl:rf2 reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacii6v:qey0e 6hz tor in a RLC seri0ihv6q:e ze 6yes 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 circpoy ) gj1rz:n4/-tx vcuit 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 impedancey( 4e/90v ult4ske7nv ht.me4m1 ahti of the circuit increases if R increases. Whenvv0lt1y.ekmte 4/ nsh44i 7(ateh mu9 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 circuifolyv:0.k 04. ymazj 0kxgm h9t. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit ib er-3 -neeh5tncreases 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 )dj+5ra mi)d(nij y x p.nqc++the capacitance both double in an LRC series circuit, the resonant frequency of that circuit+.cmiq+)n)rj dn ajix+( py5d 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 g*y8 ya.ndgk.akl k 85is driven 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 circd6yh ,2- l3sf+t4pbw tpq7w whuit 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 6gjk:te :a;ska uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thek:sk ja :e6tg; 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. zztv0:)c8lqayx1 ke9x j/ls)20 T. Find the magnetic flux through the loop when the plane of the loop and the magnyxctj1ezx )/:zkavs)890l ql etic 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 0.1lkklzgq-f*5: vz g 6g10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectok-gklz:6l5v*q zg1gf r 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(f- n(r)xas xy 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 c)+mig svod u,0tmv3:dhanges 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 cmy09e xk6s sm(d. A uniform magnetic fiel( kx09myssde 6d 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 bcus5d8gy c:c s:)*lw 15 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 au iy + h s30;j(arvft3xprtr0(nd 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 wingy dn s c.,**)60v aukghgmdn3t span of 60 m flies horizontally at a location where the downward component of ty)3gu ,dcv ktndm*s *0h.an g6he Earth'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 21 fy) tuv3hlnlong rotates at a constant angular velocity lhftu) y3n21v of 2.0 rad/s about a vertical 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 am27w t6ft(k(5 4o xuu 1jmfxy5,f mbyloops 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 ol +lj63/qfrcz;hlco 1 f 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 :4 )t ;wapavrcloop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this genera4:p; cwat av)rtor?

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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 turnvw.xdsf di:6scw 6:b4s of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output .)g 1s7gvj9fo i)/wlcnc i1 jbof 12 V maximum when rotated at 60 Hz. jnb.)c ciw)/ vjgfs9 i17lo1g 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 myfyr( l;s i3n v1w;(rhew4 (ly(f;i mvaximum $emf$ 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 Wtg td6pq 30+az. 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 have a resistance of 6.00 W. ;ts9u 1l-jfre 6s:7 c7qm3mht to4jso The motor operates on 120 V AC, and when running l7 co-;mt:h9jrfsm67 sj tqs14t ue3oat full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. w-wi0t sg- -(wgxjji 5 The operating ww - w0 tis-i(5g-xjjgcurrent 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 resistan(rsif4(v /xlhp/n ftt;gn );sce 6.0 W is connected to a 24-V power supply. The operating current is;(xgff// tni; 4rh()ls stpvn 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 W. m618 wcb vtlhfppf/6 is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the backmb 6ffpvw cph68 ./t1l $emf$ 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 voltage ofvz5jgfsxi u5neqljiy;6 f +4--b ;1 pr $120 \; V$ 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 causes6:yqu9.g(b)eco 0ykxthc7 yv 14 A to flow in the secondary. How many turns are v.qg70c)6otu cyk: hyxy9 eb (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-V prima oh92xcn1p5biry if the 24-V secondary has pxo i1hn95cb2 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 secnc xe2fh-6dt (ondary coil. If the current in the secondary is 3.0 A, what is the current in thefh6 2t(xe-ndc 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 pro)l (h* anny5kimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow inay (l5h*)nk no 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 is7z2 3t crs fiybgxq(k6m)m0z0(t;gtransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V.)t3 rmzcys6 fk0xi20 g;7bm zgs(qi(t 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 turi xtu-h6j, 9buns on its primary coil and 300 turns on its secondary coil. If 120 V at u 69btji, hx-u2.0 A is applied 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 tuska)y,r.cchwno9 u83 jmx 8;sz3nl,k rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what o.h;k3urnjc) l, , ssk8ywx3 c8mzan 9current 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 ha,k+h, lm(eodzs 200 turns. If the input current at to(,km, ez ld+hhe 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 transformer has 100 turns and its:3+kip1kkxj gv; 7ksy secondary has 200 turns. If the input voltage to the primary is 100gjp 7ks i:yx ;3kk+1kv 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 239dmxacj hi wsz3:d 8dfy13b200 turns. If the power input to the primary is 100 W, we can expect the power ousbf133 icm j2dhd 8:yxad9w3 ztput of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u 4eq(yq xkh0i0p to 4500 V by a transformer and transmitted through a poh0( 4yix0 kqeqwer 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.uealk1c ltq*udkq4nc o5,;33 The voltage is usually stepped up to 4500 V by a transformer and transmitted through a po41;k3 q 5nclek q a3luuco,t*dwer line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V snpc8 tuojm(9 ko, 45usni:/h. 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 ns5jiu tn,soc(p4 9ku hm:o8/ 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 b1fh 2b vdh:.kW. A generator produces 100 V at 70 A. In orderkb h d.1hb:fv2 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 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 aqo0z/ jjr /xtzjsseoau534;1j +m k-s 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 with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the tratmj sx 0-/e;jzo3sz54k+jajq r1 /os unsformer 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. Ho3aao-(b,bytcj/q 8ygr;t / )n 7,ksytso ctf. w much less power would be lost if the power were transmitted at 3000 V instead of cott;8b,abf7y .s-rkygysnoq, a( )3c //t tj 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 transmitted onifjl0ja,d20 r 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 not to exceed 0.010% of the original powerajld,i2r0 0fj?

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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 c.l))r3iicqbg u*mo w-urrent of 5.0 A. How much energy is stored in the coil's mr3 clg. )b) oqwii-u*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 an 18-H eby/*pv lk ;z)cqqd, *inductor. What is this circuit's time conkc ,;*l *)qdybz/qepvstant?

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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 rm y *o:0qpkaps ygox-.6s 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 the pea; n7r82rhxpkj k 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 14 rhatcq9cmsie 16 c3)20-V AC outlet. What is the resistance of the lamp)eca q3csr tmc1h496i ?

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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. Wha0vt/qu5 5c 7;v0t uff5vmmhgpt is the peak current through the r 7tcf/; f gmhqtvuvm55u05pv 0esistor?

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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 connen3gu (hbm+(t/ueuuw :cted to a 120-V ac power supply. What is the power dissipategn/twu(u3u+(: ebm h ud 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 resi-h2vjsby zzqs98gzb 8ybmil, ,k.w1. stor 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 resistor iswxm3lwv6bzb3u ;8,bsos h 7 q1 $I = 0.80 \sin (240 t)$. 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 50t)w2u + 5g.+ yo*v+ xxu4iprymrpgr-d-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 1.0-mH inductor at vo0wdq q2 r4;e.l6z edt;mxx(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 cjwy,ty-.v iu48;o x*p) nub bcoil 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 14d: b(gm2i9qv kshl0 nb(xv17 a.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 indubf y2zb1gs) ykzm)/h, ctive 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 120 Vy2mfu -avt r4,x:dh*ts0 obf5 AC at a frequency of 20 kHz is appl*hu2dy, : a -mt5sbvx4ff0rtoied 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 H2 ))tgjx*zj7fyan 1 cez 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 capaciticbk* pin/x3gg;n- uam1c5c t 5ve reactance of 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 of capacitive 7 mn1 8rp h7;onimfhywjpg/h4jj3 i59reactance 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 donzd,cu pt9mvtyoeiz4)8+6 4ees a 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 will the capacitive reactance of a 0.0diyh s +nnhmj51zc i7b;ygfn69 e0/t2 10-mF capacitor be 100 Wbd5;sy0+9 hg fi 6zt7hmj n cnn2eyi/1?

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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 capaco5:s.hm 8mkt90jzuw5ru nho. itor 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 series circuit with 12.0 W resistance, 15.0 W v l*l:466zn ln l9.w;d 8.ekkhlazprtinductive reactance, and 10.0zakll.;r w 6v*l6z:4nd9ltl8.neh kp W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W sa06 kqweb b-pef2*/vresistor, 20-mH coil, and 1.0-mF capacitor are connected in se6sefqaw0p* 2-vk /beb ries?

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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 Hzyk+) +jf. (cptue/,,zzddyfw if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser+ ydu/ekcdtf(f y jz) +z,p,.wies?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whk/bn: a aqehyo54(h 8mat is the impea oy kb4/a nhm:(8e5hqdance 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 )2 tyz49* e3y1.itcm vljghgv series with a 20-mH inductor, what is the phase angle at 1000 Hz g3ie ch ljzv y9*t42.m1)tgvy?

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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 0 p-r04p9vpktcc 2hx4e6wcmm4 awh t-a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 15004cewk a vtt9-6 w02crmxcp4phm-0p4h 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 cavb0bqm):f:* qjb 3 ku4ozl2zu jvrl- (pacitances is needed in series with a 100-W resistor and 15-mH coil t -0zblujm fuvz4q2:o*qk) b3bjv (l :ro get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a toqa1*k )lyr/ .tpk 2ngxtal impedancn2tqp)a k*1 gyrl./kxe 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 wz2jv dc6yx/ 7-iz4a ilith a 100-kW resistor at 1.0-MHz for a total imped-7jilz 2x cizv64 yd/aance 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. ey(6z.mep*6c) eb d oiWhat is the impedance at 1000 Hz?. ed(izm 6bc6poeye*)

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz a(r;kd2qom *rfor a total impedance of 45 r 2ma*rd(q;ok 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 6w:-+wmw pf7vgq-yw 8fz1fkvd96 yb cwith a 10-mF capacitor at 1.0 kHz for a phasmwz 7+: dw f66bwgfyqcfv k1p8-vy-9we angle 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 at4jt rk v1e:xyogr29:f 1.0 kHz for a total impe1oryr jt :2v49g x:fekdance 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 capacitb)cqt x8. l.qxdyc+nk *0 5rohkac8g)or at 120 Hz. What is the phase angle? k +dc.0.l8xq)yhxcc5q*r a8 kb tn)go

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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 v*zmb 2viv4 ah1+vxdkt l9.y,, and 1.0-mF capacitor are connected 1, 4via9m hdlv2.vbx+yvt* kzin 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 bjze7 r5i6d wih,1q+ua 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supj5iwe7hqb zu6ri +1,dply. 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 reactance 30 xugv ow2t.x+2/)y)jha y.ooi W, and an inductor of inductive reactance 30 W are connected in series to a 110-V,.)vogixa2+ u yw oyxjth/2.)o 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 cirxrpy.4 qvde;)cuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whend rxyv;4p )eq. 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 wixkyj( u + uns6t6zmf+6th a 500-W resistor for a phase angle of ku(mus6f6yn+ x+z6tj $40^{\circ}$ 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-txua s27pu7 w/6+ds jemH, C = 10.0 mF. At what frequency should the circuit be driven in order to have ma+atuw7s dp26 eju /x7sximum 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 eqgkul 3,45r0t /xinv o. z,msac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wh gk,4.e,ox0zu i5tnqlrs3 vm/en the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circtjfb,l4 xj kgz-n4rx8b)d ki277tc y-uit 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 resdz /w qsdt4v:/istance of 30 W. What is thzv/qd:4t/w s de power 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 RLu.a .vxwhdxq .n:i uq3//3 f0ogsw;uwC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inuwau3sqq/uo.w03gwi .xv; / hxdnf. :ductor, 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 p +-yz .:jsyax*qrk +gfrequency of a 1.0-mF capacitor and a 15-mH coil in series?pyg y a*.+s+qjr :zxk-

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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 ixp7+w b.ds * n7vm,( elyw;2z6 ccxagwn series with a 4.7-mF capacitor for a resonant frequency o+w7cb ysvce2m pnz(g6 ,d* 7;ww .axxlf 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*iadjlc)q4k. ,oa9 lw series with a 3.7-mH inductor for a resonant frequency of),alwc .*ad qkjl94oi 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 plap4atjuuq785 y zu8j:w ced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be jqa y5 :uzt47wp8uu8j1000 Hz?

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