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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 e7,j)wtw du. edxcept

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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 inductiv k5xk88u/.w2ln ;xvcxy4tp bon states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produ3g oyvux1y;( pxn,n0mces what kind of change on tho xxmp,0yv31gn; n(uy e induced $emf$, 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 r y9,rva-xp 8c3x fr:ffield through a loop of wire produces what kind of change on the i :afp9fry r-v,3 8xrxcnduced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of 2c6.*l *xubtt0f f evechange on the inducedxv0tb.t 6l*uf *ecfe 2 $emf$, 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 -q i .1u:j;ny)plgqdpo9 e1e v oslb++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, the dire4h 3o r0ipj))nqk;yodction of an induced current in a conductor will be that w)k io43ry;p)j 0hdnqohich 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 f /uafxj4.;dcilat on a horizontal table. A bar magnet is held above its center with its north pole pointi ud 4ifjcx.;a/ng 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 horizontal table. A bar magnet is held above its.1 f,hl-mf mju center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces m ,fuh. jl-1fm(when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the v icm5ut0 yp-7x1wm*emagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, wha*iwxuy7 cvtp5m01 me -t 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 table top in a region where the magnetic field vect .v7jxob6v1 isor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the fi6j 7os1i.vxb veld 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 vxjbt3v)y *v7 in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When v*yv3)j7vbt xviewed 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 evq26ld n)it*a ker-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When *2 inkaqlt) 6dviewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wir6d w6 e3jmu++h+clhcce with the north pole entering first. As +ch6w c meh3julcd+6 +the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire 9s/ j ;zk :f12rjfcwrgis rotated at constant angular speed about an axis whose di29 ;cr g/1 jkfzrf:jswrection 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 cxojpc g(z z)pa,47 8gzonstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight 4 z,z)gjp87p (zacogx 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. h1 (t9+o2 h inf9jpke2wzk1mv
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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 ei e)tfp s-g8iritg*my+)*nu 3j/w0s-uf *r rthat 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 field. e8+i n*rv9ew o 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 n*2n ao3/jjs vthe east-west direction) is moved northward at constant velocity through a magnetic field that points straight down2aonn /jj *v3s. 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 constant angularj+jr 5ylx) l0z 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 taf93uus pe9 e,c26jtj x xf8/ xx*1yexransforms

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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 revolutio7qsxg6s k8x7-cs i,ylns each second. The frequency of the 8ix67l,kq-s ssyxcg 7 $emf$ 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 devofp5/gfq /u0z3gxj qd5ovu8bt.e a(3ice 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 dewfai8 p duh32+m1b91 9ph sl,ik kkb7fvice 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 contains more loops than the primd)9 l66e m3wetfoqgz0g t/:dt ary coil then it is0eg/ m6g6tdew:foz) 93dl tqt a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the seco5.3r-wfu hxsh ndary coil then -3w5h rsuhx .fit 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 power in9.9 1ianb hprexz0sm 1put

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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 h -ptv qu3wa--circuit,

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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 ttej eoh6z57 o(3 0jpkv(/1q,am oopk *;geklko an ideal battery of constant terminal voltage. At thvp 0akk/pk kzj6m ; 3 (l oo(qegt1eoj5h,e*o7e moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of conbh,cx/,psj3 vz6fr 9sstant terminal voltage. At the moment contact is made with the battery, the voltage across the irz3 /jh sb 69,ps,xfvcnductor 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 induckm sotm)l)8*yt3jk y)pj +s) wtance 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 indu9kw/n.wr*w t8 efs4rsa5;ubtctance 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 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 ili) kag: gdd-;pj/:wzn series to a battery. The time constant fowdjg);-z:lgp/: ikd ar the 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 inductmmoue2uw4d ( x0; vw,bor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrw2v0w ud( x,bm ;eou4mease 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 haasb-qa+ )x/wr)t0 ftgve 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 supply.8x +.1*s,peibx2qyt2 nr rc mm 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 circuit, the cus vka(g-i:mh6 rrenk hm -svga:6(it

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what facab0euq,dty6 m2q ;8fvlujh8 x/azr: 0/juj8y tor when the frequency ibajf06m;h jexuz2/,8 vl0r u qq:u/dy8 yt8 ajs 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 acros/yg*4 odpace 20pnb y(s an inductor is doubled, the inductive reactance of gpnop0b /dce*a(y2 y4that 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 a b+pie2e0n. 0rk-vnev pproaches zero, the inductive reab n00n-+ pv2keei rv.ectance 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 -;b94q:h:ma6sx6t-hn um9gr dvm ayeto an AC power supply. In this circuit, the currenthgrh64t::emm9d-nm 9 baxvsq-y;u a6

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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 chab a5v/za1p8jdnges by what factor when the freque bz5 1pja/8davncy 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 zero, the .p;4a) z(sty+/g3f yjp :gfpdx8abc jcapacitive react4jyp pbsfg( tx .8faay:+j cdz3)p/;gance 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 voltjtyo 5. vmqffo/j 8 lyg)s107uages of the inductor and capacitor in a RLC series circujjo/lt7.y fyf0so1v 5gu8m q) it?

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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 anngiyg:c6w5tifiuh j+: tdr / z0 6j3bi,r ;c8x 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 the1fy(n(n 3 ssflfpkzg4/m)b.t circuit increases if R increases. When is this stab1ftf(ms.nyl3 (k4/g pz) fnstement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incf,o*6m6ugkof3rz9g v )kdrrs 4unh32reases 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 impedvf:x)g5 *qzlpance 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 circuit, tt+ hc5366cu pipc7zlu ka,1z x+a7 hplhe resonant frequency of that cir61+h pk x 3ztciuuahlp+c 77 z65acp,lcuit 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 Ad0r5pq,* :zs6owe-y /zjavvi C 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 my3kjgi.of1l 0:;u mdf/ e lj1RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unif+.+4g zik ftrzuv- z.form magnetic field of 0.20 T. Find the magnetic fl.zf+zf-+izvu tgr. 4 kux through the loop when the plane 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 0.2eu n7*cyd5 q-u0 T. Fi5 eqnu yd7c*u-nd 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 ral m he1tml.,8lggp9;bdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Fingg. ll 8etb,1;h9pml md 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 redee 1 d5dkma,w5um kc3,uced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a c, ciugmwphr3a4z; c.7/4s asaute*k0 oil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame wq5jeu tfc.8c 8ith sides 18 cm. A uniform magnetic field is appleq8u jcct.85fied 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 wit he*u*ocluxo2)5el5 w h 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 apn lri f0 d1;v.l1fam5nd 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 6l ;4dopo4tc r-cm,db +0 m flies horizontally at a location where the downward component of the Earth's magnetic fie+do4pct,4rl; d-omc b 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 thatn.x 85 yu-mnu,m 4dmuxc;dhm(ta4cz8 is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertic8xy,4n( m ncud;xa m. 8z t-u4u5mdmhcal 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 5,f5uk mp0 jk2y 6qfxcg4sbp) 6p- *ybw0 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of atkk db12xpyz:k7 *wx8)a0o yorea $0.090 \; m^{2}$ 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/4 ox d8zstz g)a:a1etjftv+: 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 o)f t :exg do4t: tz+z/a18avsjutput voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of a y6stzqb--zxc;lx0 0wire 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 qll)sj fynq)3 5 0)wljAC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of qq)l0y3l ljn5wf js)) 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 generator8enaj8 o(t5f d 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 opevbto6 (ds; d8lrates 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 2pw)x77/r7 a mrfaeprof 6.00 W. The motor operates on 120 V/7ap e m7fxarw)rpr27 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 2gz4lr fosrote ,e33k l-,( ngis connected to a 24-V power supply. The operatingf ktse4reo-gogz(2,l , 3rl3n 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 24-V power sga: z;awvs 4o9dk*ei:* c kh4xupply. The operating current is 1.0 A khogzs:cv xei;:*9w akd 4* a4at 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 igak6j 1*i w hp uo:skpgdamx)5,90*tbs connected to a 24-V power supply. The operatinp0po6xs k*k *mjd:hu 9ta,)b ia w15ggg current is 1.0 A at full 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 reduce a primari +aofk jsg9/9y 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 pr9g: 6*zwsgc/l/d bp(sf c5a trimary of a transformer causes 14 A to flow in the secondary. How many turns are sgtcfgzcd(5w/ 9s6 l*ba/p:r 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 primary if the 24c;r +xh4ruij .hd t*/w-V secondary has 100ct x*/ hij urrh;4w+d. 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 ay1a4e6lzr8 d of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in8ry a4ea 1lz6d 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. Assuming 100% efficie : u4onr qe8hrt4++g12pl svetncy, how many amps at 24 V ore s+ t1 el tv4+8:4u2nghqprcan 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 e9 qdq+fj3ki.ge :et 6sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does thqgq e .ied:k3t+ j9f6ee primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns og, , x:tm/koohn its secondary coil. If 120 V at 2.0 A is applied to the primary, what vgot mo,h,/x: koltage 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 pr5vv89,dj zmv limary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whv vvl,d 9m5jz8at 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 200 turnsw y:6*j pjlkiq8v;j+s. If the input current at the primary is 100 A, we jpkjiwq vj+8;l s6:*y can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. I.f,b5s*dohcsd,aw9 a f the inp5 aocw d.f9sda h,s*b,ut voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondaryjf fs14s8 2y7wm05afnle* bid has 200 turns. If the power input to the prima1*f4si 5 df82jbymal s07efwnry is 100 W, we can expect the 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 60 A of currenr wpfpv11a* r(t at 120 V. The voltage is usually stepped up to 4500 V by a transformerwvap1*1r(pf r and 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 vouoc:ptq:zh8o3f3) l+4xes ialtage is usually stepped up to 4500 V by a transformer and tratqolz )3 picsx:u8afeo43+h: nsmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually;7k/2 erna s.q- n ki7wmi+tgm stepped up to 4500 V by a transformer and transmitted through a power line oi; k k+egin7ms-rt2wnmq /a.7 f 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 h qod3(9qp hwz oqck c:a17x+7has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transfq7 k+qh1qc whco oz7x39d :ap(ormer 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 tkou/2 80kcwbb otal resistance of 0.60 W. A generator produces 100 /k0c28boukbw 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 3me9+:n ivv 8 oni3eniline at 1000 V. How much less power would be lost if the power were transmitted at 3000 V n:ei983oin3 vevinm+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 transmer s ,bb0a4wzwn6dgs50.ey p-itted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmi5,es zb6ne4g.w drb-was00pyssion is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is siy: b8vr:e,xecsjdxt:+o 70s rxq )x,tored in the coil's magnetic field0:xs b:rd),y7c8t ri e+s:,joqxxxve ?

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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 inductordqnv -tc7nc9 :bbp 0 i+96rrqy. What is this cirrc q-7nyd99v0 ptbn6+q ri :bccuit's time 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 circs;kjcx(ep74 ie9 q l(luit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What *j(/ ahku ;caois 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. W .xnb/ sqwx.zj el6 ioxw/+-e,hat is the resistance of the lax//xj+ b-ww6e q,znoxs ..liemp?

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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 connz 5k1gul4lxknibs+fk5 0 z-f-ected to a 120-V ac power supply. What is the peak current through the resfzi-n kk z054xklb ug-1+f5slistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What; vsd/(mbhb vps9xb+ *jq0e4d is the power dissipated in the res b db/+v4sdebm0q hsp;(vx*9jistor?

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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 resis-fr 8e f7/t fspiu*/xjtor 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 resis6t qbac/3zxb 0tor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor *vko,nu fm:2 scqe/,kis $I = 0.80 \sin (240 t)$. 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 60 Hnkk 7+42zs v,xuaeo tloz*y /+z?

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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 rea0u b 7ophc2kkyi c j1.f:7g02 g(xpnpqctance of a 2.50-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 14.0-mH coil have 14.0 W of inductive react* ecfc3bmd*n6 ance?

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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 15 .;4oj9anwzghpc12 i k7 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-;aw4z6fn 6qx*b+deiimH inductor when 120 V AC at a frequency of 20 kHz is ap; f 4xi6 edi*w6zabnq+plied 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 th,o kt tm-/co2h2 mc*ayrough a 2.50-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 a 4.70sq;h kl cjd,8a a3k(6cjrya 3-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 3ij;obf1ox, ,nvp q c7.d.c-jc quz n/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-ar4( +p fcl0remF 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 l ;gfx1kn2 f2sj*t wx1reactance of a 0.010-mF capacitor be 100 Wl;n*kjxftxw2 s121g 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 100:6eg6v mow9yb0 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 - f 3(ah(ncwmpcqz;4bt-: d b,dubg)gcircuit with 12.0 W resistance, 15.0 W indu3hz,cb mt4wcg-(d:;dgpfqnub-) ba( ctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-m .. hp+y8f(bvqp+mh orwij+t2 H coil, and 1.0-mF capacitor are connected in serieso 2wijtq8. (mr.+phhvf+bpy +?

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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 ang /.jfpc,1a+2 u vb5uuuo xonj9le at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitvucpon b.j1,x +u/5 ufa2 ujo9or are 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 20-8z(6+:: g myprpnq zcamH inductor, what is the impedance a:ypg(p+:q8m zncz a6rt 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 with a 20-mH inducp9(.mw8 .rk l0g/ t6lzwgknoi tor, what is the phat/lk. r(l8i.n9pw0k6wggz o m se angle at 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 seriejgdts5jdezk( 90(x do4( qec .s circuit with a 20-mH coil and 1.0-mF capacitor gd (( t5(xze kode0qs4c9dj j.for a total 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 jy.wz1;tl. gm6 b:tzpcapacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedan.g wp6 t.z;:mlzb1 jtyce 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 4a h: x7*d1i8+v5yhedg7 n opgt50-mH inductor at 5000 Hz for a total impedt:1yp+h*gg8eh aox5dv 77i ndance 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-kWdgxmn /-2 hl7i resistor at 1.0-MHz for a total impedance of 150 kW? dm n2l-ighx/7

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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 cap 9nhu 3kzs+;ty*mjwu8 acitor. What is the impedancn;9 ut j+kwzumyh8 3*se 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 neex(7t;x0qbim juau )( eded in series with a 10-mF capacitor at 1.0 kHz for a total impedanceb0axmt x( ;)uqjei(u7 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 neede-zxqy- 42ntgqd in series with a 10-mF capacitor at 1.0 kHz for a phase angle-2xnyt -4q gqz 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 for ae)b 35a1itlf+r7) ,t9kyfrcf:duh :l 0nzx kz total ru5+fca3l)9yz:nx 0itkfdr:t b1,hek ) 7lzf impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What i;v0v 8k; hgzqss the phase; kgz;0vq8hvs angle?

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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 i+zm7g) (crfkc3d d.hsf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serifk z7+gsc(mcdhr3 d. )es?

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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 10jv c1 kkep/kulop,ei2oi8 6;6 0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supplkuvecji6ol8e6 ;k/2 o ki1p,py. 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 reactanwd4b lf*k/ wv(ce 30 W, and an inductor of inductive reactance 30 W are (kwv4b*fw dl/ 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 l;n-egmj-qv1 v)y8vwfor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup--vvy 8elv)qmg 1;j nwply?

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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 resistotk)3zpz-)bkr e 7/pj mr for a phase angle of jt ) pe-p3 )zkr7z/kmb$40^{\circ}$ 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-mHq /a2 x -*fdzqr4l)mgy, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximuqgmrqzx- ya4)f/ld 2*m 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 res m gf8v dh3gwi xkvz.0:*7usl8istance, 15.0 W inductive reactance, and 10.0 W capacitivfz s8h7w3kx u:m 0ig8. vgl*vde reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circus(* iuwnbr1 g) (98aw5tpydaoit 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 impe6k 9u x-4ghxhqdance of 60 W and a resistance of 30 W. What is the hgx xku946h-q 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 RLC circuit conttl(y 7-/fwmxcqjy,t1ivi.7 u aining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?,( -t wif7/c.lix7qvt 1jmuyy

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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 capacit476a31g h bhd lbxnp7gnn g4u3or and a 15-mH coil in series?nudg h3n17 4ab34 g6lph7ngbx

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonanelnr 9v jj7o5(t frequency of 10 kHvj9j5(r el7 noz?

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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 rau:4 uk;nn+zm 1ipdsj j (8+ksesonant frequency 81(sdk+4s ;ukjz nmn :juai+p 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 anuw3 k-;/ sbnevd a 40-mH coil if the resonanv; ne3b/us wk-t frequency of the circuit is to be 1000 Hz?

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