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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 .5j43vzgd/pldsaju)dv7dw9except

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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 state.cd2 vf9ne 6hos 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 coieis3 4xa 5y2mul produces what kind of change on the inxa mse35 uy4i2duced $emf$, 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-bagj t,c 70rc field through a loop of wire produces what kind of change oarc07 bc-tg,jn 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 the inda56 rjynv3 i:rucy3r:6nra iv5jed $emf$, 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 kqp gqi-6wj5v ka.78q 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,38ta nbp23mh7x -o qpb the direction of an induced current in a conductor will be that which tends to produce wh 283pmn hxqpt3b7- obaich of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizonta3m v 4(ikdpe/ml table. A bar magnet is held above its center with its nkpm iev43 (/dmorth pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ayoccu; od(tu. ) uk;r5bove its center with its north pole pointing down, and released. As it approaches the ykuuodc(; 5.toc ru);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 tqfep6:wr glq -)cb :/yop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly.rqf/ we yg)-6::cl qbp 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 ta 5gmtwjx.ggh/tkj6v:,;ymaj2 )g 0ke ble top in a region where the magnetic field vector p0g6x,)gk jt/2wjahmm k;ve:gj 5 .ytgoints 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 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 ( (z6cjsye mc4horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is cje(46 yszcm (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 horizrf-hjdb mmf3v 9d -3e.b /in+fontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circlf-+rdmd 3 m9eb3bjfi vn.-fh/ es

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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 ftgo 187p z(jch sfaixt,er,t+(a 4no5irst. As the north pole enters the wire, the induced current will be (a4njtxg1f5,si8o(po( ae 7+,ct h rtazs viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axisgv 7/plch:g.; js73bg uxk9e b whose direction can be varied. In a region where a uniform magnetic field points straigc: h.bx97gb gje3p7gk lv/us;ht down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abou8*.f zsvuj3e mt 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 .jum8 *vz3f serotation 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.z/ 3e ksdpflj*sd3gp9kro+7 8
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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 thate-agy(,yx )8k3hxjv l 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 97 s9z k h+0ifne;/coyyyj,x umagnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) i qkmnc m-v4zoow2di1:ru4,8 s.4h /qp sup 1crs moved northward at constant velocity through a mag4/zpsvirom4.kp ucc21nuw,4:qm 1qr d8-h s onetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotatevunyg6 pic e;3l2. i7jwhmgbs c7y199s 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 trifbua 4-nfc1* ( kmr-eansforms

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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 60cmz, bhogm( 7yzxfv1jvl8d c*.+v(t. revolutions each second. The frequency of the(vjb.(v m7 z z hol+g1c8ctm,df *yv.x $emf$ 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 dv3zuhrt6qzv-p , 2,gf evice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a d ct b.v-shj0i*evice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops tl+ 6/q zcly6n. 4qbbsj3nmek -han the primary coil then it is a4.+ mzlkqy-lbecnb3/snj 66q

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary coiyg3wzjf:xh8k )y6z, j 1gevq3l then gz1w: , fjk3e)ygz86 vq3 xyjhit is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power iwyz8t7otvm 9*c6qq5gbh, 7 hynput

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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 circuit,n;q s7 k(ydnrj36 / 0aytkqa+g

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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 batte*:u(a+jox9wqnoo pk ))s j4eery of constant terminal voltage. At the moment contact is made with the batt*x4)e+)qnojaw9 : j (po osekuery, 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 int1a2z9 co(t-7uad- xon8l lh3t) yyny series to an ideal battery of constant terml o d7-yhytya2zx nt-9a(1uc l38n)otinal 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 inductance L mvnpqv9 bua4c0,+(fj 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 inductan,eqp +3)1,g4 rj h6twv uynllece L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time conqvb04 3eu 9bbn t05dcttpm y..ea5r7mstant for the circuit represents the time requivct3tb7.b. du95etm5renp 0 q40mya bred 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 seriesy her k t:..cldrw1d5bsgv9)(j.yk:e to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuvhbydr .t k(dc re. :e 9wl5g1:yj.ks)it 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 units ex+7 :+g/+a4b tfo i3wiisv oqqjcept:

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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 ci:taeifv q+9)qvrn08w5a/cio rcuit, 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 connec kb ygsx2*l 75/mc8dptted to an AC power supply. In this circuit, the curren28/57mk tc*plgybxsd 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 cpi5 hx/alj9 x8ircuit changes by what factor when the frequency is tripl/5i x8xh 9pajled?

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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 inducui dc,xxtt21 -o r/-rgtor is doubled, the inductive reactance of thatgoi/d2tcruxtrx 1 -- , 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 indu.ap5gkk* .jmt 7pu93 i-xc9buarzqe 6ctor approaches zero, the inductive reactancee3.pjut mpq5c gu-. iba 7kr9 z9a6*xk 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 connec u. twn6bwe86a/o7sg oted to an AC power supply. In this circuit, the curren67wn6a.8oso/ ugbwte t

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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 factor when u /by78dgqc,qthe frequeyuq7d/gc,b q8 ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the cap/ 9i.cxu5m6*uhfkh si acitivs5xkfhuiu69/ i. m c*he reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the f .w;r 6f*zk z 0hejkzj+l/4qrinductor and capacitor in a RLC series circuf+er.k *z jjzhq ;4/f0krzl w6it?

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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 h.xpro7 d(-q uRLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. 5us+9ndm/ f +tyj-/tjq2ozftThe impedance of the circuit increases if R increases.qjs +ty2nmff-/do/9tjt zu 5+ When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The/i)c mpo)4j+q2j, y, gr dvxtiy)yv7z 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 the circuit increases ap7l,+5v.* 8pe+jmdpsi veyt bk q;e7-ai:upif $X_C$ 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 bz8t27/4*zw t b/zlivr ojln )woth double in an LRC series circuit, the resonant frequencynl7bwj8tl*w/ v2ztro) ziz 4/ 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 resonan0;.-qll0y6qp; jccl i5 hnb qcce,

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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 circi1dubx,:nwneh fo4 f0e2a3 : juit 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 un r6mw 8eipe8 d4:d(rf-y qsq0oiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectoqs:-w8op460 mie8de f rry(dqr are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mdk9*k) xbq x/az s)w s)sri72jagnetic field of 0.20 T. Find the magneticai7b) rkk j9)d*)q xsswz2x/s 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 rotating in a7efv-x4mq8trp :hdpyfi:84 aufef 5e9 nsc/ 1 uniform magnetic field of 0.20 T. Find t dnm47s5peve:hfy :8fp a9-x8 uic4fqtrf1e /he magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional aree5d:aq( o m,uja of 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 f+w) +edrsf)q2 vvsqpa zj(xx/wd p +5m4uk8o6rom $4.0 \times 10^{-5} \; Wb$ 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 sq+w hxuxrz6-f u1i)pd;ruh 38kuare frame with sides 18 cm. A uniu pfux1rk8ihz)+;rw3 hx d6-uform 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 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 and an are azd49s ,+ujdxv6kr4v4gw/6muo cw5ta 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 aret jz19ncktifl t)51d7a $0.20 \; m^{2}$ 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 horizontally at a location where the)rb c1dma1t0i downward component of the Earth's magnetic fiedmtc1rb)0 1aild 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 x3lmbcbe;g 5t 9ah 56c v(*whj5/eww8sm6jspconstant angular velocity of x 6 e;5sth h(cwvw83 *gmj59 wcaml/5 sjpb6eb2.0 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 f wn.k2ed ;0in l3vn,ghas 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 km1-; rsi(rjh 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 loops on iy3ks/myazemw, 0 ;m z2ts armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum outpu2,; wmemzazym sk/3 0yt 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 of area+y9;fhx 6bbn9, vi5 e-l2x xtw5zfw ez $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outpt kv.8 4eblx9gut of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area vb 4 txk.lge98of 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 g ay.aio ns.(m;enerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor j2.mqf1 gn.wdi qc - +j7x+typhave 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 resistancj4zk1f:f eqh /0xj/ lke of 6.00 W. The motor operates on 120 V AC, and whenxf0 j1 lf4zj kk/hq/:e running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal ewp*. k2 u)tsdresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curud ekw)p .t2*srent?

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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 6v3ywyxj86qx2 , lttqly*1:sa.0 W is connected to a 24-V power supply. The 2x, ty 1 8ly3:ywq*vqasjtlx6 operating current 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 resist*lk6;jraci/10i pwbd ance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at ful 6/lk1dpjw iri*;bac 0l speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to 5ltgsi-c36 eb 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 oclp4mv6 fvjnmn ,3 o9:f a transformer causes 14 A to flow in the secondary. How many turns are in the om,j4m6 lv3f:vpc n n9secondary?

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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 1/aw+wypu: 6u ox1.rvd10-V primary if the 24-V seconda ad 1u:6owyvu.r+w/xpry 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 2000-turn )rpjxdf1v;ci0d d0t 2secondary coil. If the current in thetdx 0ivp;210frd c)dj 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 primary of a transformer. Assuming 100% efficiencyp*pjslif b87*, how many amps at 24 V can flows8ifl **j7 ppb 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)vd53 fue,b t0- jdtpr transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary de5utprvd b,ft0- d )j3raw?

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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 secofe -nr-/m5 islhsu 5o2be2 +xbndary l /h-522bi-sfebse+u mxo5nr coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on4b4 -/ofdqit ,nj:ee6nons; u its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what c;4e /qbo6ftnoje n n:4- u,isdurrent 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.jlkpz.m dw3*j7 xrt * has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondaryp3.mr.jkx jw7*zt *dl 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 tran ss m c0e9s*8ha8tbx4w*mz*kvsformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bee8xvtcshzm am 89k w *0*b*4ss

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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 9 i;kz nrwqko16k- mb)turns. If the power bw -6 1n9k) k;rkmioqzinput to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 l o fihpot/kiz4o2g*.dxm:yv 9/,scqq1/a5y A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total mdy/ ipsq./h:c2l*vk 9otiozgof 14xqay ,5/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 cbky,y2l)d /: ll7jlz furrent 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 percentage powel/ dyb)fkzj2ly, l7 :lr 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 curre 5tkiziz-t)kst,dqd3l2w9d - nt 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 percentage power lost in the transmission line if the voltage is no qd t ,dd wiz2lk)tt-5-iskz39t 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 q xu,7+j quwha,-b 4nua 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 transmiss7, ux b ,ujhqq-+uaw4nion line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has au3*w s 9b9caov total resistance of 0.60 W. A generatora9v *uc3bs9 ow 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 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 lessj7eqruw: d6/s power would be ljdes:rquw/76 ost if the power 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 tevwdn+mu55a 7,6o;ye vlyh *qransmitted on a line with resistance of 0.60 W. To what voltage must the generatoy+6vee5;,o5 uw andv q*h lym7r 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 energy f /q-cs c.g/opuz8sp -is stored in the coil- su-zp.fs8 pq gc/c/o's magnetic 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 x-s8cq6n w j:cvt22d*e0h r8- neluhp.0-W resistor and an 18-H inductor. What is this cuec-s6pl 0w h*2rdxnq8c 8vh2:e-tjnircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 V?xz f:o z0b0r- buan;y7

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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 .tdc:u45l guok4 asw; a 120-V AC outlet. 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 ova28-+xbvy.e.wigc l/3 9lc ueh1c as utlet. What is the resistance of the lampwl. gebvy 8v39+lxi/ce c a.2u c1-has?

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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 12 z3nw+dkcs+ q50-V ac power supply. What is the peak curren n w5cs+qd3k+zt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V acil,hgafh1* b j7: y0va power supply. What is the power dissipated in the resistor,bjga0fa7yh*l v hi 1:?

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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 509k fbyb1 s6y7q-W resistor 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 li+yiz6im)n))) mwb4 2u3oiysyl lt6resistor 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 resistothh 6:;hy50uqw afdf/r 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 1.0l4ckz3b:1clf2gopi :-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 59kd pzk;,m 32yiieio of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactay(a. 9e.o bphvnce?

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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 reactance at 1000 H0 *n22 kdnkeimz?

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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 wi3hfosyv*wz o5b57 r/hen 120 V AC at a frequency of 20 kHz is applie *v y/fo7sho355zwri bd 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 3vh* 8mwhv.)xa1n tgbqkud/bj:7k8 ysource?

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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 c-ap, gi(r yc.bf: kts.apacitor 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 k4.0sfj*a cq dw*5mnk o3sn8s wbg)m2sHz?

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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 awt/s-e41l ,h0nm nrka 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 reactance of p:j:t.m, tq)kvuac .pb::a8 uro )h jva 0.010-mF capacitor be 100 Wcha uo:ub)vt: jv:8j.,r k p.ma t:)pq?

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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 and+/vf b ea8zg:q 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 ci qivquy . ./ ni(e8h whi72zghc*9epa0rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivav*hcy/ g9.e0 wih p i8un7 i.2(hzqqee 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 150bl + qf5jy0haq3e6qb )p/od0a0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec q0jq haof qy3l5b)6b0 pad+e/ted 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 q2d3pi,jla ieta7nv+ r- mw.:o sk;q7uq-ee:100-W resistor, 20-mH coil, and 1.0-mF capacitor are oqq2auw- 7sen7e3rjp mk.ai ;di- :lqt +ve:,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 seri/d pzk-ea2u2;hzj vp) es with a 20-mH inductor, what is the impedance at 1000 Hej2 );uvk/ 2hp-dzzpaz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is t h (,tv uphdxd1ff/gbsb,84l. he phase hu/g,vfsl1(x,4ph.dfbbd 8t 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 need:o h e,*sjcz7zed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 1:js 7h*,o zecz00 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 capacitances is needed in series with a 100-W resistzt-7,m8 eqhvc1da ; o nj6d*lkor and 15-mH coil to get a total impedance of 110 W at n6kl ,haq87-; tdc*ej1mvdoz 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-mHm+8bvrid7hcdm( vw; t8idt3: inductor at 5000 Hz for a total impev83ihc v:7 b tt+dmmi8( dwdr;dance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 10ob)u *t3a db f43i(qu/grj0b k1q8irz0-kW resistor at 1.0-MHz for a total impedancfbb(odj3gub / uqi384r)* kt0irzaq1e 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 wit (,4s uudspv7w kz.k5 bn(0k-vka0odmh a 20-mF capacitor. What is the impedance at 1000 (k (wk 4ukvdv050d.szo-,7apbun k msHz?

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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 capacitorb+ls5w xv)z6 l at 1.0 kHz for a total impedanl )5+wslz bvx6ce 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 1.0 kHz fz7ydsl5 hx* 9aor a phase anglyxhls7d az 5*9e of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3 +2pgu* )lvjnprc7 rl00-W resistor at 1.0 kHz for a total impedclvj+* n l0pr 7p2u)rgance 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 capa(fr v ,k;pwq *ozae1o)citor at 120 Hz. What is the phase aza) o,rpv( *e;o qw1fkngle?

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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 1tpv2) t3 tsho100-W resistor, 20-mH coil, and 1.0-mF c 32vtsp)1tho tapacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit cyz(j2 a 83,ctsmky8ya onsists 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 power supck a2tj8 a3y ,y(yzms8ply. 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 da s;+nyzd01.fbgnge.e,b6/mun -ra capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series 6nu0ynbgbr;..f se/d zm a+deg1 ,n -ato 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 gx rq lkkonu(8h/.u/ n+v aa50containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectexn vhln08 uak 5ak/+(gru./qo d 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 resis *2dde w//iwjntor for a phase angle of jd/d nie*2/ww$40^{\circ}$ 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. A1v fia8de i1-da*n x3luf-:x gt what frequency should the circuit be driven in order to have maximum power transferredef3 u-g-af dvixa1l*1n i8: xd 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 i 5j7njoe *uc-xty39zkn an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivexnt9zo 7ku-3jyc5*je reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circ7qua w43(p gmbw 2dm 3d4owvf3uit 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 4 k rg5t dkt)//kszs4rresistance of 30 W. What is the power factost4k4r g/kr5ks z d)t/r?

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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 contxwu c33i+: *zcyoej5uxg:6 o kaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powekoxey o zu:c5c 6:*u3jw3x+gir 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 capacitorufdp-4ari q1 qll9zfgc-r 70r (9sr6 s and a 15-mH coil in series?qz9-gf4uqr-d rl r9ias7rl0 fs p1(6c

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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 resonantp/ ;i6ugit2ok frequency of 10 kHi kuio ;6p2/gtz?

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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 wioswy 14ejgi/86 cl e-uth a 3.7-mH inductor for a resonant frequ 6-4/oisjg c eeu81ywlency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed i:+v*bmlw rhxl2ztnqn ,x1 :l7n series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is tox*z2r lq7 h:nx+tvl1bl:nw, m be 1000 Hz?

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