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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux except:wr) we 602pbj :rbysp7s9 vpd

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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 ind3 wgwz 0thcwc5e )f 9wdkv)z;e f(b)x/uction 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 produces what kind of change o ,19vqxw7dis7br sy;i n the inid ,ywi;s71xs 7rv9bq duced $emf$, 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 strengt01vu6 mddnuj/i0 ab:lh of the magnetic field through a loop of wire produces what kind of uvin 0udd0a6jl:b m/1change 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 change on nykd,tflh+ga w 9v(cty432 u- /.eymcthe induced2wulyk3 mycg-v cth4d.e, y a+t(/fn 9 $emf$, 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 magne4*;vc- +jk2tn+t/ezqxrfgk w tic 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 9v *dq+evh5tmdirection of an induced current in a conductor will be thatedh5 t9qmv* +v 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 flax 9k ynou,d,,bt on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when vieyxon,, ,dbku9 wed 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 h/m(d2;5;ccdqupw co magnet is held above its center with its north pole pointing down, and released. As it app2(owqpcuh; cc ; dd5/mroaches 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 regih dm )c:76uio f)en:epon where the magnetic field vector points straight up. c:i:o6n d h p)m)7ufeeThe magnetic field vanishes suddenly. When viewed 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 region where the magnetic field vecl xmwz3e)(r6 ktor 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 t6zmx3wk l)e(r he 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-a 6lg ,t;zpr75vx/u s vhfwu; table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, w5u u;7/ wgatzvrx fv6,l;p -hshat is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing,ffy 6b+*wmu*x n x3kt current northward.bw t3y ,* xfku+fx*nm6 Two coils of wire lie 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 entering first. a lyi:/9.u t-tlw.f:lreu0ie As the north pole enters the wire, the induce rel0:t9 u-.:ei.iy ll fa/wtud 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 i079ec4ncv a a:adqc- vs rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dan:a9v -av dqc cc74e0own, 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 constant angula e *9q,nh4zga (nw (qj)vhsd9xr speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, whzn ()4*qxj, e qwh9gnd9a(v shat 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.)dn,fbifj+riby47 p5zx )k.u
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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 thattdki6;ipip ze *3 .)r.u2bkki4dxz :v 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 fi5zb2lrse-lsz: m3k/fjbjb0 s, , n req)v8-jjeld. 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 nort5xgw 5y(2ax g0kl 9azfhward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrosx5wfy29 g(a zgax lk50s 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 rag)lj vkfi(;2ljh ;j)otates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator traejq9ra;d4 d l fii:;:unsforms

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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 +p5ri.x:5,7 wmhr tp yia;dkz 60 revolutions each second. The frequency of the azpi5r +.;tw,5yhri 7m x:kpd $emf$ 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 devic xfr8p;dhfi, )e 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 de f0y bh)y-ta3pvice 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 conmzbg6-- wtvmnify1 +, tains more loops than the primary coil then it i6myf bnmi +-zt1gv,-ws 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 cun(,;i xrm p2q0m2xta oil contains more loops than the secondary coil then it imu2itx0( a;q rmp2nx,s 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 ykeim. rhf krz., :wc5 fj40+xpower 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 ci7etl nbn t6f4b7zp./w/9a y wdrcuit,

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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 inductor8ze5g6tn c f*17lkfzm are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thfzez 6m8nl1t7 kfc g*5e 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 connectebyt p -;ssbjo kax3w (xn439a:d in series to an ideal battery of constant terminal voltage. At the moment cont3tsn 9:aboa p3-y j4b(kws xx;act is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is yk75 qkbv;qw5connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connetuhoo ki* g98)cted to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series toav i5+yc cvo8ua+b(m 1 a battery. The time constant for the circ5ai+u1 y+ocmb cvva(8uit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery ek.ncel(xi1,/ 1b g(h+tsaq qis suddenly rti./+q cha,e1 1(egqb xls(nk emoved from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the ;f7uyaaa,-7 9spo t aasame 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. On this circuy(kt8r1mqc 27qd 3ki tit, 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 t7blb8y5:vz 79dcjxj currenlj95tdbb:yz7vx78j c 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 changes by 5 *6/nwfhb5evo dl ra;what factor when the frequency iwnd e; /afo65* b5vhrls tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is;-cu tj qb-cbv 5s-r,r doubled, the inductive reactance of u;tq5 -- srb-cvjcb ,rthat 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 appro8 k,w*,ht iivyaches zero, the inductive reactance of hiwvt*y8,k i, 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 s4z gv/i7xgpp7upply. In this circuit, the current4g7zixv7 g p/p

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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 x cfle6(jwl4i 4i*9 vpchanges by what factor when the frequency is tr lc6ev(l9x4i* fpjwi 4ipled?

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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 acrossg s0p:vs;wu,y3*qnakfpd 44i a capacitor approaches zero, the capacitive reactance of that cap3sks0f,4 :p;w*v4yqun idgapacitor

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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 ,al (rkof 8m 7n.4tgfmbetween the voltages of the inductor and capacitor in a RLC series circui.g 8 7lmk (n4rf,motaft?

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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 de1 ;xtcq)z,vm uwft1 k,(bop)yh2ot +ofined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R,*ee s5kgv;z d. )kigi:qwxw2 increases. eksk x; d2ww:g*vq)ei.,g5 z iWhen 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 imp9t8x1o5d p9vhqugvsx q i)g5xk/ (ji:edance 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 t4u( ew3kpz7bna 2nxxm:rwzz c8w8qe.1ge v:0 he 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 andkbdr p+w6z-kay)m1z50t 9ly e the capacitance both double in an LRC series circuit, the re5rwp9+1) m0ztb ldkykea 6 -zysonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At x06bli1 vxf/ p d a1vd3+f0kkcresonance,

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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 , ps jz(pd:tgz;)e n.aoccurs 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 unb k c9:hy6; )yitghxn0iform magnetic field of 0.20 T. Find the magneti: 9tyknyhi; g6bc 0)xhc 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 rotatings ; 8iaz)b*(qy qxic4y 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 vecq)zy (8icq *b;say4 xitor are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magn,tgx5 k,tn 7ztetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic f ,,xtk7zn gt5tield 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 axm*eq 9o bc30idjustable 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 cmauw;g *l:j 5eww0f0h 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 with sides 18 cm. :d-cjf):w az9c qt1v 2dimhu* 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 2u9zm1cq: *: ft haiddjv- )cw8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 d2mi - g; q1tp0cus/uhturns 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 areaf(1ea c gy8e.r $0.20 \; m^{2}$ 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 hoy.: xud zn8lqlpx8q (x98aew: rizontally at a location where the downward component of the Earth's magnetic field.la y qxuzp8(q9e w:ld8n:x8x 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 2a:8rh3y*pfao .0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fao3y rf8 ha*:pield of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area s2 ucijk* /*;/als97f9ldyrrodl7 m lv4r2bpof $0.25 \; m^{2}$. 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 ofb5k,vmm,q 2rwf ;s eu) wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loopsz5g8d1,kgrp (aj y-i l on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallelyiz5ap( drj1 ,gk8l g- to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire o 0p7hylk w;d5;6 inqykf 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 pd/sf;kg 2s ru-gu;6vgenerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. u; vs ;gg6k u-rf/pd2s If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with lo;c :yx5a0mya 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 3 dc y7, povomc064uyqpd)i -nW. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The mofh vtz*d;:x67g)wf 4hc :ecvy tor operates on 120 V AC, and when running at full speed it gen7wvxy;fhg: d:6tcz ve) 4hc*ferates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is conngl u2 we*-mjgs 7y ll4)7kl,yxected to a 24-V power supply. The op47y,*lj7ly2lgl-g mexuk ws)erating 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 supply. a:iewufd)7 v) j57wcow: e1 ux The operating current is u e7e1:dj 5w )a:7xivucowfw) 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected td-oq ui4l)n8a.q+e x jo a 24-V power supply. The operating current i.ajqe+- do84ql u )nixs 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 sqi-u8cnmex6.wf0 8 vto reduce 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 of a transformer causes 14 A toiy7d-i;-s vz 8 ,bymmr flow in the secondary. How many tisy8 i-z;r-dvbm ,y7m urns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turnso2q 7+*o4ou*fdhm of 2rpg: hpp4sl-f are necessary in a 110-V primary if the 24-V secon*4*pmr-f phouofs h7+fo gq 2do:4 2pldary 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 awngv8zi -vs:6g8mkuklt5n +b 9(s+wk s-x2ju nd a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the wk:gnl-mk(8isuj+btgks 5vv2n+ 8uz x6 -w9 scurrent in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumiyiw+ z ,)+pbzqkoaz93ng 100% efficiency, how many am ,9z) a+3wpyoqkz+bzips at 24 V can 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 10.0 mA. The pe7-qo81armxrc/ pdz2n+j yc au,x :9primary c2qj8- /,71u 9yd mpezxacna+op cxr: roil operates 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 transformers9/s a 8tw;c xb2 us3n,re)ovq has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vor 9e)/x;2wsq au tn8 ,ssocbv3ltage 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 6n3uzkh8 -u1v p0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is a 3zuuk-v1h 8nppplied 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 secondary has 200 tur m/ xrcukh-cr+s. gyjud43x6)ns. If the input current at the primary is 100 A, we can expect the outputrmh d6uy xgjrcx./ s)3-+c4ku 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 tresn2 .+tny3s urns. If the in +tneyr3ns.s2put 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 andyn-cpo q6fc)+n4 uhputfv13. its secondary has 200 turns. If the power input to the primary is 100 W, we can c fvy)p 4fpn-+ n.1hq u63otcuexpect 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 zi5b *b+vq 5mgstepped up to 4500 V by a transform*bg+ibvzm55 q er 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 voltage is usua0.zyd.hyc8m:qh tu o-lly stepped up to 4500 V by a transforme:o-0myh.d 8qhzcy.ut r and transmitted 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 s5xxc.gce qb i1e *-*estepped up to 4500 V by a qigbec- .cx* e*1x5setransformer and transmitted through a power line of 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 kmaqti v-mf(v ;87 yr lz7wpe47j long has 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 vme; fr(z7w a4yvq77-i t8plj 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 qub l ;/q-ccssi 0w*f3resistance 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 thf-qb3 /;uw iqlcc*s0se original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line cn9hsv*dssctos,,qk 2n26hl1i )l8 j at 1000 V. How much less power would be lost if the power were )l hc svn,9i2 socs6n dk2hq*8l1j t,stransmitted 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 V at 20 A. It8fv,b; h3rarh s bv3*z is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a , 38r;bvh b*avfhr3 zstransformer 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 c o tg--rjtfcyc*7t(-stored in the coil's magnetic firty(o7--c*c- ftt jcgeld?

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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 resisd1eoa3j 7ubc nf1ko67tor and an 18-H inductor. What is this circuit'o 77jfkbu6c1n a1eo3ds 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 circuit where the q4w 9jf kbr. *vr95umo/)t djzrms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak 1bl5v; fcv 42h m+bxsecurrent?

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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 resistance of the lk(*x(( 7ziq -h ix9mudtiel7n* mq2h vampv2 i*9i num*l hm ( t7((-ekxqizdx7hq?

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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. bie nh78erlrp( 4v3 9w 5hly5qWhat is the peak current through the resistoql 7 5prhril8 vw5 3nh(e4bye9r?

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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 kk5 clk rf5xl2 vv;z+)to a 120-V ac power supply. What is the power dissipated in the resistor?vf2 ;)z v55xlk+kk crl

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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 resist79y cpas4 obga0d 5xd/or is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 01lg8 k2petx r mg9jc5is $I = 0.80 \sin (240 t)$. 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-q, sk ar3acwi0q+km19W 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 o d qxfy884*y vlx34k; eyu2cupf a 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 reactance of a 2.50--0)u(;x itffccdx7tc 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 cov ,a:sf,pvmg5fn5e+m il have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive e ;zz9 cj.gqpj)tg rknvm4 ,xvp5i ;.-reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz i+j r --)o,ou1u)zq(skw lw ke6kbak7os a okk(-uqrl 1+owabuz,k o-wj))s7 e6kpplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz source?)tt4v50zorhixsbo8 o5 v6t0 b

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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 reactvo3 ew9jo:1y jance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactr0xw8m lon c4 )kcliw2 )xs*g8ance 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 have a reo.t: cj vty/9cactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 1m61dnzu *pea (00 Wu16d nempaz *(?

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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 capaci.v3xw rhv,l1 rtor 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 n6o(mzg uqr(l6pjx7q sz/*z (with 12.0 W resistance, 15.0 W induct(g/su(xqpz l7( 6qnzm6o*rz jive 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 rs vk veraw.q 8uw;541uesistor, 20-mH coil, and 1.0-mF capacitor are cu;w1krvq uvs. 5wea48onnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-ma* *,izgrld/+ eu3vzcF capacitor are connected in ser lvr3 *zg,adei+ uz*/cies?

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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 connec.4(lwfdr;gxqf(+uu 2tmw 1l tted in series with a 20-mH inductor, what is the impexm+(( tt4 ;wlfuqd lfur1g2.wdance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in serieseshc(4v)u*jk1lk*c l with a 20-mH inductor, what is the phase angle at 1000 Hz?vsl*c4(ek1*lj c)hku

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needyt1 r) pyul)h :9y(i(+pbi bmzed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W i y 9ymph()rbitblz(+y1) :puat 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resis5dnf,nnk(z4h2u*wmixh nkh f bt1 (11 tor and 15-mH coil to get a total imped bnxn 4zm1n,(h 2k(nf1htw5khfidu *1ance 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 ylhxt6vfn) cr***p9;a u3rc2f ecs,tin series with a 450-mH inductor at 5000 Hz for a total im)* ,9* 32culax;cy*e rf st cthfvrp6npedance 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 sd m -+vtx, h/yk8c.hxneries with a 100-kW resistor at 1.0-MHz for a total mtxn,hvx k/d+ y .c-h8impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor.sqs 8gsh i(6u3 What is the impedance ats3hqgis us8 6( 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF ca-* l1l unjvh44;j 5*avbep iospacitor at 1.0 kHz for a total impedance o45ilhl; *jj pv-euv4b so1 *naf 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 capacitor9q w0 g s2v6ryo3n3uhs at 1.0 kHz for a phase angle o 62ro9vnsq w yh0usg33f $40^{\circ}$?

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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 a1v 3r8lpqh rpx8a4sv 79 7q r-bx9ixgj 30-W resistor at 1.0 kHz for a total impedanc48qqv xxjl-s3a 99h 7xvip rrb1gp8r7e 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. qexzkxb ;mdy /tx5l 7 -:;af;kWhat is the phase anglezm7fyq/; kdx5 akx;;e x t:bl-?

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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 fh pog/;84 6 esm.fb :joqvmnlkz, x.61500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec,ofh6vmofqz bnx/;pmgl64 kse: j.8.ted 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 10.0-mF capac yynbpf+ib34j8/f a.r yc v*z6itor, and a 0.350-H inductor. The circuit isi* 3zcyprn8 .v4y/fj6 b+afby 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 ind8asm +z,:y jayc ly;o.uctor of inductive reactance 30 W are connected a moy;,sy +jc:az8.l yin 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 pcst 4c5n ,:i7ovt6pbresistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power stoiccv7pnt 4:5sp 6b,upply?

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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 phase ay rg+c t /pgvi0/bb+g:ngle o/bg ++i:r gytpcgbv/0 f $40^{\circ}$ 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,1 epjr x/77chr L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferre7p/7rcej h rx1d 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 outpukr .mn;0rm o0rt in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to ; o0r.0nk mmrra 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 circ*nv 3 d:8nyfs30y:s.wvijvr muit 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 resisv,( cqfz*wjmyn(oqfk5*s , 3ltance of 30 W. What is the pl, mqoq(wcysz5*f*f, (vk jn3 ower 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 factua he 8;oe g;nugo8xq5r3 3zx(or for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducxo rqzax(3en u8u g;;h8 3oe5gtor, 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 coiu3 gk6kzsy3 0u e-x5ofl in series?0-6yzus35g3ekk fx uo

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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 resonaid sz69oau-opltzq.1: nwscs y 68u/r vc179int frequency of 10 kHz6p 1i6ao l:w.-cz 1zuvyd 7iscn t9qrosu98/s?

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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 r1tl;*x twkhp(,8ki coesonant freque*k1;p wox8tc, (iktlhncy 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 be06e (kn nhylev(m2p8i placed in series with a 30-W resistor and a 40-mH coil if the resomlnehnp6e0 (iyvk2 8(nant frequency of the circuit is to be 1000 Hz?

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