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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux +kh kr2dwc8,jexcept

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thf02inik(ua p +e $emf$ 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 zms gqy-7l :b *69cmlhws)l0/7lyw sc a coil produces what kind of change on the ib 69 lwwl)l0hc/*z7smcy q:mlyg- ss7nduced $emf$, 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 field through a loop k- d7cd37 b2arkfh+bhof wire produces what kind of change on the d7akhd7rc 3+k- bbf2hinduced $emf$, 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 oisi5 d xdx e)*b17vx;nf wire produces what kind of change on the inducedxxid vs7 x1)ed;b *i5n $emf$, 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 magnetic field an g)-wq,atl,d *j86woy 6eo hnc /r7rtm$emf$ 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 conductor wi/,vm ta2r nd*zll be that which tends to produce which of the followi/ drtmn,a2*vzng 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 horizont pv+hfjsvk7 kav4p 597al table. A bar magnet is held above its center with its north pole pointing down. T 7j+a ps7vv hkp5f9k4vhe stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is he rxua1i 2z agb7/x22pyld above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces ar 7p12/zxyxa 2i bug2(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 maglibeko v:(babh.8:t.u/2k7 s9 qbrhjnetic field vector points strb 8hh(72 ibb:o lt/r.sukqa:k9 .b vejaight up. The 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 magnls1x4 s7zyrj 5r) j-pcetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, wy1xs47zsr)ljp r j5 c-hat is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region wherex byrz(9p*ba1 +tjty; the magnetic field points strar*b ;t (pxtb+yjzya 91ight 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 carries an ever-incjlj6bi0y cluma *(9z9:hzw(h a5qz k7xn 1ty,reasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, tw56t7zi9 : 9qy kjxu1 z(ba,* jnlamlhhc0zy (he 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 w89w3bsg ve(chdjk ; fkuo52d:ire with the north pole entering first. As the north pole en9cfd58se kb;vdgk 2ujo: w(3hters 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 angulp4j7gm y x jab7jq2d4*ar speed 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 loop7yg 2j dj4ambp*jx74 q'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 about an axis cg+lh j13meyk*lvt3. 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 3hll1 kmgyt+c3.*jveaxis 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.wrr8dl7.rbu0 u-23 qn xucn 7x
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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 .0w+swn ey; pnan $emf$ 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 7yxlj1wxa i, 2f1;e w 8o)gdyxfield. 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 al sx lc8-;umc4uh:gc 4+b8k fb (wlj7the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement8 lsh fu l7: k4 cgab;jw8m4c-ucl(b+x concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates/ /a 3(n6xuzg gjkrkl9c9: qxy 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 transfo+gvth8h8pzm / rms

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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 todzoj y8,j9 .x8 ffzo 3ciid,mm0 d++fhrough 60 revolutions each second. The frequency of the 0ijjc +doi.z8m8f +9f, yzfd 3d,xom o$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used 5p lg2. 0jp2tn-(c. gijif lbeto

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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 devisr7z;w0 4kr e s64wgaace 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 r0i 4xvdid266rkk 2oscontains more loops than the primary coil then it d22r r vks60ix4k 6diois a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contai6s 3tl je7*zunns more loops than the secondary coil then it is j7*6sn eultz3 a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpe6jsjcye8--k+a7 h y dut

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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 resonarzm6 w59x6*xus g/(js olfi /ls1c y9dnt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consvv (f9mz o-gopzd*2h4tq+, wjtant terminal voltage. At the momeqdvz4o,zpw v-h+ 9 *og(f2mjtnt contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ngy(m qe(/l)n;lb4 emideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor nnemlqly m;)4e(gb/(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 ) w5 kcsa7am(yinductance 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 inductanc*bm -9 am 0kqvyhu0c*ce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an in g.zde gv5onc+3:d a*ri4l0qyductor are connected in series to a battery. The time constant for the cir4 n d0d*3:ag. yzqiv o+gl5cercuit 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 t0fxall*zuko,**q9 f lge/dd8o a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for d/8lu gf0 kxfz*9,ae* lod*ql 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 hav0y5 u(7w9kj e-vnwu -afooo,k e the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power suph8 acjtz,qam: n +mp0+ply. 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 connectedzo.g:9r c p,we to an AC power supply. In this circuit, the currencw.o9 e: rz,gpt

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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 ngx8vno9g wp:l*( p6cq8d xe vzy+ 1(qwhen the frequency is tripledlzpc1*v 8(d(x:p9wnxg6eg o8 nq+vy q ?

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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 doubleaf2;ab;o toqj1pz *px7rm0b1zo5an6 jw 6:cid, the inductive reactance of thamwanro;ab czf:xz;i6objj 7 qoa*p62p 01t15t 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 approachespx zu-ga8cc,8,p zd (g zero, the inductd x,ggz8 cupzac p-8,(ive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, te;dgd.j z8.1ne.zh tche curre;.8. jtd ecdgzzhen.1nt

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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 changes by what facg6zh:uc-bclnigb5 0 .tor when the frequenn u il5-cz. bg0gh6c:bcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacau5) j9 i-t)klua, grjitor approaches zero, the capacitive reactance of that capauj5 ltaur9,i) kg)-jacitor

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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 inx*0dp6n eam3r8cj n5 se*, tqyductor and capacitor in a RLC series c c*08tqje5eanm *nyd 6x,rp3sircuit?

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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 defia;lq u 2xh;w91uapu. lhd2 tj6ned 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 increapow7aik 3yg 30ses if R increases. When is this sta3kpw3yag7 o i0tement 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 circui gw3cosx(s 7ed,8v, mis8ol0mt. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of thnil8m zb9f2)n e 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 doub t( rh6)a80zj;g,odhcz 2drrble in an LRC series circuit, the resonan(d a0)ohdgj;, r8 brthzz6cr2t 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 e/hd . fknk*v,7xrf.g. 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 RLCjcar87(m r9l h circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0s;5) ftbwe(yw .20 T. Find the magnetic flux throuf)t(5 b;w ewysgh 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 radiusj*8h5orh: d8-imv j7ij:skx a 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lmk7ds8 a-:oh ij5: r8j*hxjivoop 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 rotating in a uniform magnetic field of 0.2l /pvuwr)u*, lz/w jvxzhvq 5+hv/a960 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectojvw/,ll6whvh pu/aq9 /5* zrx)z vuv+r are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area oeyj 1m9n;2nh ef an 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 coil changes from 3w3mc )mjeh *x$4.0 \times 10^{-5} \; Wb$ 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 :s16eawbysv+:mu-6j l+l er p of wire on a square frame with sides 18 cm. A uniform magne s+lma1y-e6+vp:e:wru j6 ls btic 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 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 turns and8rgzb iw c-)5w 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 arejfm,mil2 / cp0a $0.20 \; m^{2}$ 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 h wvhe;mk dq;8)orizontally at a location where the downward component of the Earth's mag k vwed)q;8m;hnetic 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 l*tm gaxjc4ir 7k. x-g:ong rotates at a constant angular velocity o xj -7* grmac4gt:.xkif 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectiona-l6p4: wj/hg0cmo 1p+ /cbmko /20cogc pgjegl 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 og5: j2f wd;ecmf area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each lctzvq tos6/ q/,y(25o73 e zw-d sfqimoop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator(5o/ts/s7-zwi eqd 6 3, 2o ymzvfqctq?

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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 cs g0/ vvq6 ybs.snc,+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 construh/+ yg2zt7y l 7jw nm,a:icndt)dfd kadk./72 ct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availadm l7d2a/wh 77gzj: 2ttn.d fk)cnyki,/+dyable. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxvn d0-vde7 aqmhq1 ye53(8 kjaimum $emf$ 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 mplzr;+8sortz6 / bx c+otor have a resistance 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 have a resistance ofzdp+x 6x mf 3,tmn ;n6nr4-zzq 6.00 W. The motor operates on 120 V AC, and when running at full speed 3 xdzmrfq ,4pz+nt xmn;66n-zit generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is conne 4:+gvf+q,w lrno9tn7m sdt8jcted to a 24-V power supply. The operating current is 1.0 A. What is the start-up curren 9 +fw:nqod nj 48mrgsvt+,tl7t?

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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 igxx5y((1 dw: prf fw8( bare+zs connected to a 24-V power supply. The operating currenr(w1yx +5( (dw8pfarzeb f:g xt is 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 resistac,k t;ok8dwj (nce 6.0 W is connected to a 24-V power supply. The operating current is 1 dok(;kwt c,8j.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 needexaf)6 2i3fqku ;s kmqjb,,k1gd to 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 causxtvd,ow( w ,q/pi1;h s;,gq-ilhn* hfes 14 A to flow in the secondarywfg,;;- *i(, vq hwn hl/i1odx ht,pqs. How many turns 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 turns are necessary in:)ph x)nu8:mth r(,xtu.pew p a 110-V primary if the 24-V secondary h:rp (. )wxmt8punu xht):e,p 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 a,bn4tde9k.l/ br e8e/ ctekf +xd *q-g 2000-turn secondary coil. If the curre.ektfb*g4-/9x d bqkn 8e/+lert c ,ednt in the secondary 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 primar8*gwau. -iqa uov;p/ty of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow iniu 8/auq go t;pva-.*w 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 me lr-/r+npq qj -,r.vprovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primaryqr+jv -n l.mpe/ q,-rr 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 crbzgyg4 f;p q3uko 4h3f4b 57bh*.rxz oil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage i 3r54*fg 7g oxpz34f .z4 qky;hbbbuhrs 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 turnsj3 i8k:y t wc*c4whno:c3h:fr on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pr4 :twj *8co: rhnc:c i3kfyh3wimary, 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 seco*qrms9 3gcka 2doc)7yndary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondm* 7o23y a ckgrd)s9cqary 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 tur3j,hmo4a+ s(qjs2ucul. :yzuns and its secondary has 200 turns. If the input zl(au c3+h .su jqj,4mu2s oy:voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. y 2 vh1c:uut5qss ) q-af.n1axpxjx45 If the power input to the primarj5.5: f tyuxs2h a 1svunx)qpa4-q1xcy 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 stepo::yk9.c ),tsbp uc neped up to 4500 V by a transformer and transmitted through a powerk :: 9)uoc.bescp ,nyt 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 usually si0x+eqzx n7r8m/ 0hxstepped up to 4500 V by a transfor/ xx0z +neh0s8 xqr7mimer 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 at0* ti-n9pox1;blt q xvi.wv0e 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted througv0vpwtx*xqo ni01 .-tl;e ib9h 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 km long has a cd y,f r2t;u-.vbzx4p total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energyudbcf4, v zt2 -.;yrpx 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 resigw ws2,hbjh7jzxxi.: +, i ,hx0 ynxn2stance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the b+ w0:2njiyxgj2,iw x h zs,nxx.7,hh 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 at 1000 V. How much less power,v9,hp6crd l6ktua+ca9k(cc would be lost if the p9ra k 6vucc,(d +a69 lkh,cctpower were 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 V at 20 A. It is to be tb7 .xt( m3a j7p faj,rdlll9z2ransmitted on a line with resistance of 0.60 W. To what voltage must the generator output (l,7f. jap7r jxld92 m al3btzbe 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 +o/ lry-7zotrqce;b2 energy is stored in the coil's ma;ly t o/7 2rc-+zbqerognetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What b i fpl;-2,mdwis this circuit's timi;l dwb-,pfm2 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 voka5b dsgsx f/i:(hj :m(o:rp.5 fdad231r jhyltage 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 curz -.7w zt adr6:jmlmv3rent?

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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 thk4+.6) jrknx3ip asrm e resistance of the laikxn pj+.r)r64mk3 a smp?

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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 su( /k7r1swm2uoitr .9 a*- x0 i- iiruti(ojgxgpply. What is the peak currentr -oruk/ i(gi2i9iaouwmxs r- .(t0 *xjt1i7g 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 y5. mbzsgz-os-u9mxo oanq 5p3 3v,n7120-V ac power supply. What is the power dissipated in the resistgmm.o v55n o3-szsb7 xo3nua ,-9qzp yor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resis mwhj mwo37)a//gq4pktor 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 resistortydtibbh 5as+ 1oc qtt93f)q:e ;*fa+ 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 rn90chr 99bs l;k-7nq c5 kvrbjesistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-bsx*;6hjcqwy14;tk2d(e h5p ( ecqavmH 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 qho54w v6pr( v6-vb ee2.50-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 2mxstkoxf /7, 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 inductiv-,qtlz9ul e o8s:l*cme 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 fgqg *os t4a)w4sy0c5un/g*z srequency of 20 kHz is applied /04o )n sagg g*5quzy*s w4stcto 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 ,f/vz1m-5uz w chk5w-5g pchbsource?

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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 +yjj 6 i9q92vywpnqo56n ey1j 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 reactance at 10 )nuho3-i8wr)agg+ mu 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 capaipql :mjdb+7f ya53lysd 9 i.,citor 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 capy*p2rha; k, xnacitive reactance of a 0.010-mF capacitor be 100 W,p arny;*k2 hx?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and2 dx 4 pk5s;;pcx7rous 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 1iq5b:/ ze+uzz2zosn ,1sj.sa3 g qq9l 2.0 W resistance, 15.0 W inductive reactance, and 1:u+zbgi.z/z e3qs,zss5 o9ql2qanj 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 if8 xkvm;bxrv wa cs,,ahd88.xl **to8p a 100-W resistor, 20-mH coil, and 1.0-8cahx,wl*8p vb,x8 md8xtv.*s;r koamF capacitor are connected 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, 20nrtjy7x l- r7h+o 3ma/ +otby.-mH coil, and 1.0-mF ca+mbtxo3 +yh /jtyl.n r7a-o 7rpacitor 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 cytr b:nq+t+- i, bz9coonnected in series with a 20-mH inductor, what is the impez:b ciby,9+t + ront-qdance 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 series with a 20-mh3ws b exu2.9wH inductor, what is the phase angle at 1000 Hz?bw.xw2 9h3u se

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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-mrqv,u*d.+ qiinf* a.kF capacitor for a total impedancq i,f. dv*kuqn*i.+r ae of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capaci7 cbra4w 2tk-d0wzo4k tances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?o-c r4d2 70twwkakb z4

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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 pu eygkv1cugz1 5v ;p;qw( 8oi*vt in series with a 450-mH inductor at 5000 Hz for a total impedance of 45 ivvqo(8y1 z*k v wpug;1e;gc0000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a tofw;-collsc-ndk /7o 3cwc/ks 3ol-n;fd7 -lotal impedance 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. Whatkxkw. k2-mc804ot ddg is the impedance at 10028.04-mxt gkkowd dkc0 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 kHz for ak,ixwb,geo xj)c52y6 total impedan2og5x ebxkci)wy6 j,,ce 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 wk auqm+:r;ter9 0q v5xw0tg j9ith a 10-mF capacitor at 1.0 kHz for a phase angle of 099+eqrjwgkt0mauv q ;t: r5x$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0z*h nzqpt-((x qv:a-c kHz for a total impedancn-cta(:(xp *-zq zhvq e 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+h/1-ri ;nu*gkm w jcqcp)9t9n6u:hb6 izp zp is the phase an-*ctih6+w nphuc n9pb91pugr /:k )zj mz;6qigle?

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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 150:fcl(x 4ess-shw0 swgfm*5h,0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in fs,5clsmssh0fhw* gwx(4 :e- 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 0-gga0dzkm )*jcoc- qcapacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply.k- q d*g0z)m-0ccoajg 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 .1gnxz9;rqv c capacitive reactance 30 W, and an inductor of inductive reactanc .gnqr;9zv c1xe 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containingtrurn; 3e r9zt8(-niu8xtq u;w4y3gr a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a xrt93 8rit yuqn;(;ng8- wu3z 4rrute 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 resistor6u*o6 b g2mwng for a phase angle of 6ggo*uw mn 26b$40^{\circ}$ 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. At what fr8aka ;uvo0a 1 yi y;bmvy);uvh3+: vdjequency should the circuit be driven in order to h aouk0v1bjady a3;him:)yuvv; v+ y;8ave 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 ans-ry) 4mk1edhcrh+b ; ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive hsh-r b4kde;1rym )+creactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuitx;oj)* r0oxzcnc:),adz;0ta hmo o/ c 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 sge;/l45sohuhm/- dg4aae* p of 30 W. What is the p;dg4as5l sgpha /*-moe4uh/ eower 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 containingsxu2m 3yf 6s9k a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecte9mx f2 s3kysu6d 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 coil7 w y uq fp7;ep+i85skewgth+6 in series?fqk e8ww ++5 s 67geiup;yph7t

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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 fw0hpdc59 is dmod i8; o4kx554.7-mF capacitor for a resonant frequency of 18 4d5sm ; 0dkohi9pc5o x5fwid0 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 seriz6vj sfeo px;ve/33/ res with a 3.7-mH inductor for a resonant frequency of 100 3 z//jx6e;ps vve3fro0 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 c ( bopvj7b;3qplaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the cir7q v;pj(b c3obcuit is to be 1000 Hz?

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