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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 l 3zltdx4q f:,magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states yv(4z8n ;3qghdd 2ez2 iehi2athat 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 wir)kwt a)xhr-5c iph-rlm0x q0.e in a coil produces what kind of change on the 0w -x)q)i 5a txhrrhcp. 0km-linduced $emf$, 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 p8ii: bx.:rqamagnetic field through a loop of wire produces what : :.abrx ii8qpkind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of chan/n -0 conwkv 763enhdpge on the induc0he okn- vcn /6dp3wn7ed $emf$, 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 removedah f32h sii0o z;j:aa8 from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conducoar 0enogy6ti7eklsl3h + . zq78t3b)tor will be that which tends to produce which of the following effec83nqtoart0 sey.h+7klg6b iz3 7l oe)ts?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet47itlej:vd x63o6o ut qh 9.pi is held above its center with its north pole pointi4id j xtu phl:.tv679ooq ei63ng 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 tabqh(ek *w.t 1mvle. A bar magnet is held above its center with its north pole pointing down, andk (.etm 1q*hvw released. As 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 magn 8hp 2)ieji/sxetic field vector points straight up. The magnetic field vanishes suddenly. When vex 2 i/s8ipj)hiewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regix73 2qk0p /v/r*qtsj awi 5mrron where the magnetic field vector 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 field irs/rxq3 tjp 0v r*wqim/k27a 5ncreases?

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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 ink+ h (bfbv(fo5 a region where the magnetic field points straig(kvo5 +bff(h bht 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 4; g 9m(2m-jyuievnuacarries an ever-increasing current northward. Two coils of wire lie flat on the table-y92iamu e;4n m v(ujg, 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 p: p-hujy9g6vbr oo*a qmg00z)2.mms a ole entering first. As the north pole enters the wire, the induced current will be (as viewed from u 9.o)mgb 26 0o -j*aahgrpszq0:mymv 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 sp0;jm:q (5r,w wg qgg8d +(lt zlfmyu,qeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if thez flq,,l(8gqg( y0gqtdm5;m:u +w w jr 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 abocy*v kojxlj) 1b44c2d 2ntuj *ut an axis whose direction can be varied. In a region where a uniform magnetic fi4cyu1l b2 4cod2jn tj kx*v)j*eld points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.jgl;udldj 5zfni6+*;188w n9g pyw je
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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 and8,: *u7pxuw5yph.pm1nnhcb6sbz , v $emf$ 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 ma4ui; low3:)h tao,p vdgnetic 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-westkj10wtby.k 1a direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement cotw 1 a.1k0kbyjncerning 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 bp/9rs4 czo(lrotates 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 generato:s x(jf ftx35qr transforms

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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 rez )cx7 dseo( kl.w3r gxf;o--hvolutions each second. The frequency of twhf x-odo .r(ze) ;k3 l-gcsx7he $emf$ 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 devi l ihoewhip11 :*z3kiu e5fp/9ce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thatt10k0hm8hd bo ax)7z j) gj;xpmv8h o.

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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 secops* ++ )migyvh ) h9ykbg*my*ondary coil contains more loops than the primary coil then it is as + y*y g)mpv)* ikh*by9om+gh

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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 (d,j q 4f/nkgsthan the secondary coi/ g4sjqn(d, kfl 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 power1s-+hfno 0x yi 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 circui 9juqs4c,c*uk.53 hv vbuoa/hgb( o 6f9k3 rpkt,

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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 v.n243l qnh oyto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the volh.n ny42q vo3ltage 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 i c7f 3v 4tujku+9afpt6deal battery of constant termincaftt746k +f9jv u3pu al voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with induc*s0- ; t 2s09f+8mxokkpk2plmx xmevztance 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 xm7y ra *)ngc./br0ddresistance 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 in seripv),ey 3t uhs/es to a battery. The time constant for the circuit represents the time required forev3s /hy,put) 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 tosg/g tf wkjbtj ri5o 3hk 0o(28d;6z.z a battery. The battery is suddenly removed from the circuit. The time co;k ws3/rg0 8oiobzjdthj5 . 6zg(t fk2nstant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same uni8n+woa7v,t lls/*cewts 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 suppljp-9ahnul 6 p)y. 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 circ4adczu((,uq xuit, the currentacu , 4zqx(d(u

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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 factor 6 ph1:i -unrsq9u aqw8when the frequency is tripl r:w1qq96h aus-u8ni ped?

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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 (arpsd; 6a:bgvp w2y .inductive reactaas:w; b(6 2rdppy.ga vnce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an :hh;u v,+lfso inductor approaches zero, the inductive reactance of;ohlfh:+us ,v 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, 3)bvlsv+uuv.the curren .3vb+usu)vl vt

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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 l55dtm1c(+ c fwoa/kicircuit changes by what factor when the frequency is tr lfa 5d+otkci mw1c(/5ipled?

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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 /p3x.xqja/ pd r qp qkfa3 (gf3d;6lj.approaches zero, the capacitive reactance of that c3akqdaq3/ .x f/ dx glpqp j;3rf.j6p(apacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a:r66dxa te8, ftmrqx. RLC series circuexa.6r8txqf, 6 tm:r dit?

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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 circuit is de d-kp gu+g2-fafined 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 ci2isx5agv .g+ mx5-o9j ud dfj1rcuit increases if R increases. When is i- +xx2ug d5jdam v.fj9so5g1 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 f i4mic,uyt23impedance 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 increases ify eqb/o7mfc t) o68d q+3r:vzc $X_C$ 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 boxmx zc 6i02 -i fsk.u6ua.fx3 pn4wsw:th double in an LRC series circuit, the resonant frequency of that ci3f:0fic.m-x 6 ip2ku6w4 asznxsw xu.rcuit 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 drik+ o a1k)mn umlk( 2lq7u6xt2oven 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 seriessjlb6 *rg v1x) RLC 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 im rq jov((xdzg mm sk+q18qbm/pr6;)/wuo 13cn a uniform magnetic field of 0.20 T. ko mo s(z/;pbm38v1q r m)(cqgq d6jr1xmw+ /u 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 0kbpy n+ o1jcj:b,89d i.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnet8c: b b, 1pyo+j9idknjic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatny3+svh- (zsting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of z+-3h s(vytns 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 reduced/0urkmd va2; i 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 changes frouv o(g wfcmx5.dpjd:g)34v7/x sa0urm $4.0 \times 10^{-5} \; Wb$ 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 sr1*ku0yn;f a2plej5 rides 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 average value of the inducen;r lf0ae2k pr 1uy5*jd $emf$.

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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 wigp ,,5.pt) y8ra avequth 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 and 4wrr)w,u( q qzep:l.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 of 60 m flies jsd;:eista 0, horizontally at a location where the downward comps i:j, t;asde0onent 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 2.0 m long rotates at a con t)zj.am3tdz8e.p0n r stant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic3tjtenz0 az. .)dp mr8 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 generatobzpgi6 v.0ety+wg- * or has 50 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 are-q md 0dw6)gloa $0.090 \; m^{2}$ 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-xa lyqfkbm 9gy ,2h*0 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 perhg0yb*lqyf2 ka 9-mx,pendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tuq -bq 4)bx1id24n y6lzy;zzh0cr wm(yrns 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 co91dflibl/. dqe f m-,qnstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of thel/dm qfb.,lie 1-q d9f 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 ww4w 98e*fm p jj)1qu wnt+xo0uith 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 xjiathb1( o)o*;caw d 1 p;k+jW. 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 ha7 pupf6gb;-j /mr/pnlve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a 6p7/lm /njp brpgu-f; 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 supp:5dmc+b ls 3ck ezd/2yly. The operating current is 1.0 A. What is the stad3m ky2l/edb5cc zs+ :rt-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 connempbdvl1-4 h ps,;h1g0 hb nqwydq, q5.cted to a 24-V power supply. The operating current is 1.0 A at full speeh;wv5qyh g q 0lhd1,41.bbdqp,-m nspd. 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 is connected to a 24-ocqv rm , d)gy;.)x:jbV power supply. The operating current is 1.0 A at full svcqgym): odj)rx,.; bpeed. 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 primary voltagr qciwo3)m3 jh m1;p d;ta3q/h.tx2eye of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secon7rj63heaz8 m bojm(q8dary. How many turns are in the secondam 3j(8eqaj 67bhzor m8ry?

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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 24-V j0,ekmm71nbp secondary has 100 turnsj0 enp7b ,k1mm?

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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 k cdsaw2gf r*1 gt2ta,wdn 18,coil and a 2000-turn secondary coil. If the current in the seco2 s* fg2,gwd1rk1aca, tdnt8wndary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primaigj0nq+4h +r2qrz rz0 re)h6(hz *hrqry of a transformer. Assuming 100% efficiency, how many amps at 24 V +*h j2hzzrhq )rqr+q0r0(rnz 6ie 4g hcan flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at edap6xm-5c/nf2 hr 6 f10.0 mA. The primary coil operatedr6p6 x 2 5/ecf-mafhns on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its msk 5tox4 n3np j(sk6)luv 2/zsecondary coil. If 120 V at 2.0 A is applied to th pl 45vm)2nx( k6/3tzkjso sune primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 30 )pqtfc::q)bn0 turns on its secondary coil. If 120 V atqb:fq) :n)tpc 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seconrcj ;8wtu vs m. *e0kzb)1n0qjdary has 200 turns. If the input current at the primary is 100 A, we can expect the outpuqw*;zj j ) t18rnkuc m0.0sebvt 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 it6tr0 mw5im dj:s secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bwm j6mt0i :r5de

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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 seconda9gl/l da.6 vyhry has 200 turns. If the power input to the primary is 100 W, g9.h lvald6y/ 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 v x/.y va8+8edccd:x8theu5s*q (ockd oltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numbdek8s5v xcox:.ut+cd 8a yec8qh(* /der 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 curren gb 9dtq0h 0f,h.vrd h74dl.dct at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the perce,fvr b .40ghlc hqh0dt.dd79dntage 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 stepi6;*eu8zf nbvuk79j gu xf0r,ped 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 if the; fknbi89,e07 ujzu* frgxvu 6 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 resistanem* lgkq;yx8 1ce 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 would be lostg 18*qmk ye;lx 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 resis-o 9kiu8l 7ee:vugug)l6; apy tance 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 e)7u g:il;oe8-69 u lkpvyugawith 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 li e(0vdi0lnb1 y0;id mone at 1000 V. How much less power would be lost if the power were transmitted ld(0v0d ye; 1ni0 bmioat 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line ip2v4o*s1v sdwith resistance of 0.60 W1d sv2*si o4pv. 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 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 .fss;,ya x*h benergy is stored in the coil's magnetic ,hs;. a yxfb*sfield?

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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 i0oc9ld 2p 7eflnductor. What is this circuit's tlcp9 0ol72dfe ime 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 ,;czk0xls hm2m imt-l xnm,2(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 outzn99mw1ds3dz rg6a / d40z mw:pob;eh9u;d arlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outletne)lcywmr2 (,- umys). What is the resistance of the lam,u- ce sm) )r2(ywmylnp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What iud8pk2;0fd dy s the peak current through the resistor?2dkf yp8u ;0dd

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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 the l- ql0s3owia/yb2 l1 fud8- qypower dissipated in t8 qoiqb0 w/l13- ys-ydulfla2 he 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 res d )r0o(hc a4vzzfh);iistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist f 1-op++h/*vo,p vkcq7 icggpor 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-;9 jav *lol)btlyr/ 5fW 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 ap+f+k r05ckc6:kt;1uxiuh +c x1irk w 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive n.t)2c;za i pjr, tgt1iyj3(o reactance 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 k6dmtv+( i8 sy4bb6yainductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reasg1r1gu*w+8 zf 1rgmc ctance 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 la5psb7bi j/gl+xl96ib m56y at a frequency of 20 kHz is applie/b6jl lbaip b 6 7x5my9sigl5+d to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourcxn( 8pp/zf1 ejjoz++x e?

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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 at 10 kHz?al(7 ybu hh0t1

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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+uev9 :gvx 2i72xxwky tzf)8 n 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-mF capacitor ha,.uyf.bqml s.gik5;7/hg keu+hte, c ve 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 re y btp sc.zy6 7q/wn9,mtut:2dactance of a 0.010-mF capacitor be 100 W?,76sc2/wqmn t ub.d:t zt9yyp

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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 76gy f+ i5( 6ae4rr 7octkg q7jcstfj-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 12.0 W resis km/ btn,lx/t/fmtu m9b2c-b9tance, 15.0 W inductive reac2 bl -/k/f99mt/utbb tnxcmm,tance, 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-mH coil, and 1+k 1 r.rg+u 5via70ymfr+yoce .0-mF capacitor are cf7oc y+vi+51umakr+y 0rgr. eonnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH c,rt-(na+e0neyh5 2 yxgu uk /m)apuq/oil, and 1.0-mF capacitor u0e+pt/eyunyn/ )2, rqg-uhak5ma(x 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 20rehsw.j-r7j-i9 t6p7 m9dmg x-mH inductor, what is the impedance at 1000 thr9 j.-r-j769wmmxed7 sg p iHz?

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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 withd :3xtfkcw( )h a 20-mH inductor, what is the phase:) f(wx kdct3h 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 series circuit with a 20-mH coil and 3q4ukw nsb:- g1.0-mF capacitor for a total impedance of 100 W atn gbq4-k3swu: 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 following6t*g61j9 wy;ntb phi z capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total w1bpji 6n6y*httz; 9g 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 0jl( 6fk-vow ainductor at 5000 Hz for a total impedance of 4000fv (kw6o 0a-lj0 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;q aim8g hn/p3 with a 100-kW resistor at 1.0-MHz for a total impedance of 150np;i3hgm/8qa 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. What is the impz)i9 2vs 3inxjo sw79medance at six3zwn)9m2 9io 7v sj1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kda0w w:yk7z98ko hzp+Hz for a total impadk y:79ow8hk+0zw zpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at *6h0qo 9n,3n fwo a-0igj8laxr4 kier*qff6t1.0 kHz for a phase98, go*feaf6k*3q w 0n-6x rhftjo i4ln0riqa 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,yb7lzkj z, in9c( iz9 series with a 30-W resistor at 1.0 kHz for a total impedance of 4 i,nj( ,kz ziyz79b9lc5 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 cu:j5/iqxf r7n8*g x;2zxxe9 g:h ibuw fan0 ;at 120 Hz. What is the phase angl/xj :r0qxibnx; wf2igf:uhgn *c ;5u8ex az7 9e?

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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 1ex6(dj z q:zm(; d7d7hda 9)oxkjvvz *00-W resistor, 20-mH coil, and 1.0-mF capacitor are co7vd((6vekhz x; qm:j * oz)97dajzdxdnnected 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 conapcqq5)1m o 2ssists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power2aq)1s5m qp co 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, p rc,z44 b)bdd56i(gn cfmxcp 7rvw8- and an inductor of inductive reactance 30 W are con,cm7dx(rv p ziccbn6 8g5d4- pf r)wb4nected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, a /b 4lo21xngsb 10-mF capacitor, and a 0.45-H indo4nlb2 sbg/1xuctor, when 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 with a 500-W re3op -luft5eo t +:gp,d8vpb:tsistor for a phase angle o3upo:+5,b: pt e oldtpg-t8fvf $40^{\circ}$ 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 = 20 7l 2cvi*qg0 .mcj4xpn0-mH, C = 10.0 mF. At what frequency should the i p4cc.7*lnx gvm 2q0jcircuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in ay/ku9i39fn pq n ac series circuit with 12.0 W resistance, 15.0 W inductiv9q kiu9fy/ p3ne reactance, and 10.0 W capacitive 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 anty3*7tm vwz5 d) nw-no AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W 5daj+k 6opeu dj e14v4q):tbdand a resistance of 30 W. What is the ek5e4bj )j o6vddqdu:4 +atp1 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 containing a 50-W resis9rot2qj4( r egtor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supr4jq(o re9gt2 ply?

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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-m 8xfa xlvb66rp6my,p 9 )o1drxF capacitor and a 15-mH coil in series?xo91pf6) ry66,8xa pxdlbvm r

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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 fnigr :,3r ho:nor a resonant frequency of 10 kHzrn g:nhiro, :3?

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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 m d4 kcl; 9ei6u,gwpm2series with a 3.7-mH inductor for a resonant frequency of 1000 lk;pceg2wdiu 4 ,mm96 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-gqbd7oi) sfmpzq9ef8d i ;)88 mH coil if the resonant frequency of the 8qb898s) zi)f q ;pdimgofd7ecircuit is to be 1000 Hz?

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