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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 ,y6ytcy15 d s-6gya r,itci4 zare units of 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 sta *sqekuq)d8)wbu1n 8 gtes 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 sw/) c v5uhl)ttc*g;yproduces what kind of change on tlt5)c /cvy ws)*gtuh;he 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 f 4h07b 0u.5h-lxcx ml+uhcap*/gll foield through a loop of wire produces what kind of change on xuou hlf h/57l 0cmca+p4 hlbxl.g0 -*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 pr2,/t b+ofcnsy oduces what kind of change on the induced t+,/sb c 2yofn$emf$, 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 apd +ajts gj- 97iky9g15sy7d f 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 direction of an induced current s btmqwj79o1j )jm-m ,in a conductor will b ,mowqs)9 1tjjm-jm7be 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 hori dc mjqc 5fztkw11.4*lp4ijj,zontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magq 1t.mcd f4jwki5jl j14pc ,z*net 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 ai(xx- z9si+73imhb -f 8jc9 9kh6enm8 rjrcdb horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. A 89kxdr cicmjh9r b3jn- 896is(bi-hefmx +7zs it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the m ju ag (f --yqaetp/ey,*k7s6ragnetic 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 field kfa e-/y6*a je,u gq rytp-7(sfades?

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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 io2*r6i)jh96 hrlj nnj n a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the )nr6njlohi2*rj69h j 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 fiu+u 45sjt4a4 *:mfj(+m9 lp ek ibwmsteld points straight down. The magnsbt4mk54jm:w mp(+ftjilus4au 9 e* + etic 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 onnuien-u1x3gw7j )5 q a a horizontal table and carries an ever-increasing current northward. Two coils of wire lij31q w)nueax u7 n-ig5e flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole ente90otnn: lep8 c2ib9jhring first. As the n8bjn0 9n92p letco hi:orth 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 is rotated at constant angular speed about an axis whoc/xfa e p--4frr1 4ay sysy)-ose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orief1x4p)yasera r c-s-/o4-yy f ntation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abhyaz 8 o6ym)z5a q/b5eout 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 rya mob85zh6yqze/ a)5otation 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.4s v))gqtc 2lv,m:nni
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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 t0wd n8hxi35 lc/uyh-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 r gmq9q55juh.a magnetic 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 nortx,q-allb p6yd7d *5q chward at constant velocity through a magnetic field that points straight down. Make a statement concerning theq 6ylqbd 7p5ld*c-a ,x 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 angular veloc494ztanwlgo +tye ;s6ity $\omega$ 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 tralprxf3gp2 57knsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatesy 8-fs vt31 6mstcyr d8e;vjp+ through 60 revolutions each second. The frequency of tht+8;psy-msyc d 3re8 tf16jvve $emf$ 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 dtg us 9x )5es5c:ywx-wr;mkl/evice 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 doh2iovi/ v*wfp6 bh5 4evice 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 primaryrpsqxp-.cw : d7 7i*yr coil then 7irw :d 7 x*qyps-rc.pit 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 coil8fz0zr d s,j olb/-dh* contains more loops than the secondary coil t8 h ls/-,f*jdzrzob0d hen 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 powe7 /ul6z4url edr 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 cie5-t*ni: o 9skq9 tpjtrcuit,

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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 inducthf ) 9si.vk0b*(l5qe lq(pgvy or are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battq p5e)bg(svl.l*qkhy0v f 9(iery, 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 ckyi 22c*,w wy -jnsb5ideal battery of constant terminal voltage. At the moment contact is made with the batter2 kiwbscywycj 2,-5n* y, 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 mafgee s/.;n )z3w x 9z3 je38s4gx), vnytakrR 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 ando/kjum w(h,h y.pfu,. 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 4k/ u)bhgi.v*l,3+bby 2 b.iizgti lrconnected in series to a battery. The time constant for the circuit represents the time required for the currentzkih*i4 +ri /tg 2,3ibbug.lbvl by. ) 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 connk2.a yyi,v-z* ksi;kp4 )ri mtected 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 t 4yit)kzivmp i2*a ysrk.,k; -he 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 saw tp swvz5-y) )(v ,8aydjtcf(me 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 sn03qr75hg) idh t(wkuupply. 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 qup bwrmw1t*l6(my*n , g u-t0supply. In this circuit, the currentlm-qw u *,nwy*pmb(tug601r t

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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 changkq( .y8mqsh 3nes by what factor when the frequency is tripled3m( y qk8hn.qs?

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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(f qxx5c ;6yn qsp+x7d doubled, the inductive 7 sx+;x56n(qyfp qxdcreactance 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 volt;w2gv ja;c. asage across an inductor approaches zero, the inductive rea v;g;.s2wjcaactance 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 poqi:hk v-ta -ut ty,))pwer supply. In this circuit, the curreu tkpy q,)-tvh:-ita)nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanceh7k+s+kp gz *t in an ac circuit changes by what factor when the frequency is tripl+ts gkh+p 7zk*ed?

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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 approach6os2co ,hk/ ooes zero, the capacitive,oo6 k/c2oo hs 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 theh9.nluor8pt b wdvzn. ,88pw( inductor and capacitor in a RLC serph8n8 wpnu 9 ,to8(blrv..zd wies 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 ck3ujvt+ttcl8ou 6 c-;ircuit 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 i63qxsp ssg f/9e2 uym,+ nrfubk,9hf)ncreases if R increases. s2gfs,x s9p/9u)m rf3fhe ,6+ ny qkub 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 impedance of the circ/,oad 4 yt/jkpuit 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 ofr eq,s8cf5 3:)zpi.2wnkwq dt 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 qpzrx 08(ggb ,b-s7g3v ohe 2ein an LRC series circuit, the resonant frequency of 7eov ,3bx-rp(8z gheb g sg02qthat 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 applidz s)m)g3na4 yed 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 circuit occurs whenou. fo:d 5nyo)p0jiveh 2d,r 8

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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 ro8:a89jsa :sif3uklcxmz1 0gxvad .q,tating in a uniform magnetic field of 0.20 T.,8.0v xuk gms jc a39f:il1qzs8:axa d Find the magnetic flux 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 rotatin y*ljaiw ;6 gw4n5ih8eg 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 vectoge6n ihiw4y j8* 5law;r 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)nsllg8se -. iei3-qm in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thl 3s imsin)g--eel 8q.e 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 an8un:6 lu.mxw i adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coi9 c -pnd,opsy2l 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 8g0st6 d6uuv0bzvn1 z,m8 hkdsquare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the d bv z81zvk0 0t hu,6udm68ngsaverage 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 wirer2l n8v-iecnjrl (+37z - svjz with 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 andt3;j s(pdtf+ i 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 ofhfi0s :3:ho ih 60 m flies horizontally at a location where the downhi:o 30ifh h:sward component of the 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 c.7u8a1oldpbe, m( r -oyjy1z2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends whilc(1j y 1,p8zrlm.e-b y7uood ae 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-se lhsfi0v ):z4b+qy 8i3ff e(iectional 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 ar(i:tudzxq b0ssm 2y+y f1*z h9ea $0.090 \; m^{2}$ 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 armaturel5 5a6zr6jf d2 nfcsg-. Each loop 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 rotzf6rc2 55ag nj l6-fsdation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turfr2,lj7t : yqpns 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 anmi 6 h3remuis(/eoqjf 8tu9)y*qb7m7 output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of sum79t joq*873fmeeu i b(hm /)r6qyi 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 wx+ jvql-5of73i nns ;mith 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 resis,6bvobr n ,ge(tance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor haw6yr(zpjjwv+dw tvc3w d0*98 lrd: ud /l *bt7ve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a l0:c wdj/tdvu+*lzwd6wv t(rw 978j3d*ryb p 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 internaosbm+gs*;m2au/q8 ds l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start- o8bgu/msq;sm sd+2a* 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 rmmt 0r r8m:oipk,k+ yvq09r+lesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spk0+lrk0y r:oi,m +8m rmqv9tpeed. 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 intern,gj*t v1cq j9mal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the*qc j,vj19t gm 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 reduy)9j*ddi.aro5q8b nf ce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary 2x y 4ar8qzko zewc278of a transformer causes 14 A to flow in the secondary. How many turns are in the yw7q zeo2x4kaz8r28csecondary?

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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 ue:/da p,myi0turns are necessary in a 110-V primary if the 24-V secondary, yueapd/:i0m has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and ):*ihogk4 k6l 4pqw vxx:da)ta 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the ck*h:op4gx) ldk iqwt6x)4:av urrent 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 q zb4fe5h637ku xymj b(wgurj7 0)7 bkin the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary x(7f4)670buuygej3r z b7q bmw5jh kk?

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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 neotdy2 3 l;g.dakn sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primarydtygl23da .k; 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 tuhc,: uu2mco:dpx7; vvrns on its primary coil and 300 turns on its secondary coil. If 120 V;u ::u xp72ochdvvmc, at 2.0 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 turn 8bdkmp2if 3e7s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current di e kpfb7832mis 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.6ml n2n4ckg0 yvpd s- and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curylgd.v40-pkc m62sn nrent 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 turnsd m/pyr* a1t 7m,xiqg(f3qi/f . If the input voltage to the primary is 100 V, we can expect the output voltage oqr fg7/yit(1qam f*im d/xp3,f the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tyq 3zmr0q3s( 6stmh)nurns. If the power input tm)qsz m06qhs3r yn(3 to the primary 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 current at 120 V. The voltage is usually s1o6(w,fp-/m7p: a gf sexncmltepped up to 4500 V by a transformer and transmitted through a power line of total resistanc( -agfwonlpx1mf7 sc/ :6pm,e e 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 cur h 7d.1c:i:pkvh r7sif74rs iksv5wu;3t3gyy rent 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:v u5fwtdy k7shsi rvi: gk77r1 p;iy334h.sc. 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 alu/cuj3*bc gym +3ti0t 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance +/u3gbc m3jlcyu*i0 t1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 f52az3zv9otttce ; 5ocqf- x2W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tv9-5z 25eoqf 2tzcc 3;xtoatfransmission 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 of 0.60 W. x 8o,io;y .,+znmqe,84estde6rw kl t A generator produces 100 V at 70 A. In order to reduce energy loss due to heating,w,o.r,t oeqn4+dxez6lki;8 y e tms8 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 downhg( x8r4 usf1p a 6-W line at 1000 V. How much less power would be lost if the power wexuf rp4g h(s81re transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 Vt9cye*t5 co u*ej5)*i lt f/3wlvd2 pe at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator )wdee*pcy/2 lt9tvcf**ojui3 5 el 5toutput be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coil(lhiji l.r n01's n0rl1i(jl. i hmagnetic 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 containsgp b l/e4jjj f*-v92sieuk5j5 a 6.0-W resistor and an 18-H inductor. What is this circuit's timei vkjj5p5sbl f94*uj2jge e/- 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?3/wdg xed567ivec kv2

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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 tg t pje o qu,9t3p-ngc2:k-8x-j 3xqlahe peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the rs6-yhfr+m9ddmro */r6t j y:sesistance of the lamp *r: tdfy +osrdh9s-6jm6y/m r?

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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 dkw-lybb6 q:6z.li (va 120-V ac power supply. What is the peak currenlby 6z6.q(i: lk-v dwbt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is t vl5iy v8n.+zrd4lgw8 +5vcughe power dissipated in the+zli c g.4w ynu55vvl+ 8d8vgr 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 resil)lp48ssps4) g,gvmt4p* t ebstor 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 50-6 dbz l3bj0c.fW resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is* p3xfpu*j 7ez $I = 0.80 \sin (240 t)$. 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 inducjhb + 3b5r *o jv:;h v cdnc2i)1fgwor1jwoh:(tor 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 coi7*6onjx+rd06evd,5 q ;aqbtd iac.osl 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 reac0p. ;ohc0; uxrg ldku3tance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactancegma8 9z.sgm sl06f 18,moassz 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 V AC at a frequency of 20 kHzdx w;mj6lu+v y2td1- n is applied tydvx n1tu w;2+jm6l-d o it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil dueoo0biv-in*0)il q*b: e1q z fa 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 4.7-mF capacitor q6si 4um +txox/ +ya(jb/d km99-n zbuat 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 reactance at.gz y jz /8zt6ge7ygk1 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacita7 ,-tu .than 7an,rkw/r(ijbjvsi9 8 or 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 cap rbghs))w-h6y-g /q ceacitive reactance of a 0.010-mF capacitor be 100 Wgs) h/hg-wycqr)b e6-?

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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 t 3l1qdnhyd8x6i-l*g1fub 0r a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12, qz lo/8gzgsu+3wk 8r.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactasg /g, uwz ql8z8rok3+nce?

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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 imped-f6 f g:m:bzl;b:mln fance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected 6f-:lmf:;mgnfz :blb 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 b3ym lpbw+2ymy- eyf,ku;ann:4 0u) l100-W resistor, 20-mH coil, and 1.0-mF capacitor ar3 0nyb,y+ fkal b2 y;4ume :luwp)myn-e 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 s9*sqbcg+9imrn:y*ai*j (au 2, ztj o series with a 20-mH inductor, what is the impedance at 1cr*s +m9ztnab,q u:** jiyjiog2 s (9a000 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 inductor, whaem 6mz qpzpa3re9 8t;-t is the phase angle at 10e-6 qpa3 8rz9mm;tpze00 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capacy o;;+ qoiwk6pitor for a total impedance of 100 W at 15 yq;ko;owp i+600 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 series with a 100-W res;sj j2o 8q,x:lwr1scsistor and 15-mH coil to get a total impedance of 1102:;,8s1cx l jowsrqjs 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 must5doj.wgv)hp* tkc 8f,sf*;e r be put in series with a 450-mH inductor at 5000 Hz for a total fwthfg c .pes krd**5oj),;8 vimpedance 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 b+79fq e8i/jv5ihvkj ve put in series with a 100-kW resistor at 1.0-MHz for a total impedance o9ikv5+vhf jje7 iq8v/f 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 capacitg89rr8yq2 5a agp 9nlijxwj3 *or. What is the impedance at 100a9n *r3q9p8y jxrwg8a 2i jl5g0 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 1tpw:)uwr)( 6toivl7 b.0 kHz for a total impedance bvo (upr )tt:7l6iww) 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 inliqfj( *gn2-7*awgiej6 fhm7 series with a 10-mF capacitor at 1.0 kHz for a phase angl26*qjglm7(ijen -i f wfagh7*e 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 u5qxlr31mcn 7 resistor at 1.0 kHz for a total imnr5 l3qm7cu 1xpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is tndxx/q(kkjhb l( e70oq+j m.*he pha kox j(k( /7 bj0e.qdq*lhm+xnse 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 ,)f(i oty x o9-xu.r+ngkn*vw 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitoxnr yn,- u(go +ivf.k 9t)ox*wr are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a gpc ukw yc*x910js- /y8nok8r10.0-mF capacitor, and a 0.350-H inducnojys8-kw u9y*8crc1 xk/gp 0tor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductoreb5d. il2d. a5u2n fhn*3 v8sn(w 1o wjguwzh9 of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cuv 82n o3lu 5uhzsfid(.g*2 b15nd9hwwea.n wjrrent flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contaz6- b. a)sf1 kr gcrfz+deod/cl+2x/eining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conn.o dr2d+)kzfcfra1e/6+c els/b- xzgected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a ppl r/ax 7pt(2yn52uaa w/e20nofrs.n hase angle of r.xenl0op/a7 fnapt a/(nsy rw 2252u $40^{\circ}$ 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. *3 qrl 4nlt( 9h2zto*j)h edxf At what frequency should the circuit be driven in order to have maximum power transferred frolthd hxj3)fn o* l4 e*t9z2r(qm 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 cirng b/qm hfh6fd0z i;v-v9iv)6 cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the cir06/v fbqzg)9h m-6hiidv nvf; cuit 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 AC0dm *+.6qp o b*j x)wzmgsig8f+sqm*d circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Wha)u.8qn1vym30u u(bk zpma *lqt is y0qpn qumavb )3u8.(* 1zmulk the 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 circuit0 t:5jwswv1yb containing a 50-W resistor, a 10-mF capacitor, and :j 1v 0wby5swta 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in series.gnk+ca gg* kkecm*zv6 7r2r2 ?zckvgga kg* *+r k22rmn. ce76

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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-ms;te5 9,unwjlF capacitor for a resonant frequency of 10jt uw9l,;ne 5s kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor fory s1yp( +vmjb:/ r 6zov (l0ky;fwg.gy a resonant frequency of 1 (6y.m/(syv+ k0lw fb ozjy1;yvrp:gg000 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 mu;mjt:f8bnsd-n. b f*h 39clfdst be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circu3j bfht9 *msc;fbf .d8d-:nnlit is to be 1000 Hz?

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