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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 3 +o rovuz/spx5+k7w 7e8b ldsflux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thatcc5 ihj7k..7 .ea qkgh 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 ou:9c : ddkji((.s mulcf loops of wire in a coil produces what kind of change on the induced (c:ddmkuu .sj (9 lic:$emf$, 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 o/n6 0d5wj)9 qhgsezr*mc yn c(f the magnetic field through a loop of wire produces what kind oc)shg95q nmnz j*c(y 6/re0d wf change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diametevbpz w 3v) l:5v8l5api8cl4 vsr of a loop of wire produces what kind of change on the inducevi 4a8)vl5v8 pc:slvpzl3 w5bd $emf$, 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 fw2 kfyq.u( v2brom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the directio e9h*-fa) uai1pj mki+n of an induced current in a conductor will be that which tends to produce which of the following effects?afj +m*h9aiue 1- i)kp

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet ;w :*6lf gp+vyw .3o .3cgpi-xtbjaen is held above its center with its north pole pointing down. The st bn lc3jww3;-gaf6 extipy.og:*p+.vationary 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 flqp rj-wpy. rkwj-xxx7d 51,u1at on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling x1- x5kpp wdrru 7y.-jqx 1,jwmagnet 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 ou8d. t pdl13 9nmgr6rtop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current 93 dg1nr8plmo 6rut .din 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 tablj79q o a)5vq*/esj)rr xd 2rnye top in a region where the magnetic field vector points straight up. T/n9jx 2qsjy))rva do7r 5req *he 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 horizontal table toprk576 ap *wx:t.eulrf3n *ggf in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fiellfk g*ex*t7r.pf 6 a3g5nu rw:d 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 tabl lj iz0 r+/4cp ehr1*rhf3o0gje and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the w1 0ero*pr4/ lgrjhzcj+0f3 hi ire. 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 withs*2aq t; ew/ .iwmqe,l the north pole entering first. As the north pole enterm/ ,i2e*q.aqwls t;ews the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about al)ssxx:hw96b( h.jve a 7xx6 an axis whose direction can be varied. In a region where a unife)laxh(x.9jvshbaxx6:s w7 6orm magnetic field points straight 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 anguafrb7 ld; xb(p clj-*u+,*ioolar speed about an axis whose direction can b*,(cb*;rdx iu lpof bo+- a7jle varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if 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.dm0 6 qpom7*fd
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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 t hy/brbs, ou5p7j so, gzm51x++b(gfahat 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+5yh fu-cia ag/t f(jbgn .:w8 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) is8mk*i. oil(f)a c29z zgf u*vu moved northward at constant velocity through a magnetic f 29i)*i*kv (lmga8cfuoz u.fzield 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 rotates at a constant angular vew1i s1; iomb:elocity $\omega$ 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 tqkr;0-18 .qxo tzvcglransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The fr e-n:gdg*),vv0k-u t dqsyfr0 equency of the sfn 0-q d,*dke:u-ryg0) gvvt $emf$ 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 toj7g+b0grigl1 :o l 6rq

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tdrtj5+ bo :lz)hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the h4mzs0t a2tg2-qb; rcprimary coil then istq;trabc m-g42 h z02t is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if th2lw/fj7k oxu , 6n.lfxe primary coil contains more loops than the secondary coil then itxo/f l njl2f67k, uw.x 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, thel i*z 9h2o9obts5u*da power 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 resonantzb )gvi zl409i 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 connectedc o-te 3l(id+f in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltageei( co d-ft+3l 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 conne7ai /emsyy0ic67fz :7dx5bge cted in series to an ideal battery of constant terminal voltage. At tcebyig77i/7 0 a m65edf:zsxyhe 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 7l(41r3 nzoxtk bsgf6ta ue2kp9h* 5xL and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resis:7c g t1bd;,3mi1+n t 5nusdduuvc,sl tance 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 tim/bsoj7nr +k;w e constant for the circuit represents the time required for the current to + wb7rs;/kjno 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 ser7g9euz3,-rih: cymd 6s r-0) nep1xd pmkbra; ies to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to dece1dmepz y9hc30nir6 , a -u)sgm; 7k- rrd:pbxrease 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 *nw)pw t ia*i6i0ik4j-lks 6n 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 3/nuaeiy sj 9w1zf-6i. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. u4m h - ffknjing.8r+aez+3m, In this circuit, the currentik3f 4mjhr nzu+fm8-. an +,eg

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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 when the fy1ke4ievfd bo0) zk67 requency idf1 y4) ikkoe z0v67ebs 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 volta9+or)84 buj mkyjjs6y;xt; nn ge across an inductor is doubled, the inductive reactance of thatxon rk 6t ;)4jj8jyysnbu 9+;m 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 aknt28 uik,0ks8no qd7cross an inductor approaches zero, the inductive reactance of tha0o8k tk 8 2nisdk7nq,ut 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 supplwigas t+3h0/g y. In this circuit, the curreng/s3ga 0t whi+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 factorxthvvk 7j:.)e8g yjd-f ,m cs,doi5/9 mp bm,q when the frequency is .ft8p ,,mbqji9e5 v-k ,ogmj:y vmd xdcs7/h)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 stk 73rwf1f( sthe AC voltage across a capacitor approaches zero, the capacitive fs1s7 (3tkfrw 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 inductor and capacitor in rw /r9 2y: d x11tjdv.ygcbeu3a Rr1 djy/2d yt xbe1u9rcvg3 :.wLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC 04 ghjt;h) oz qcncl6acsyr w42hy+3-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. The imhn2wkf/qjb*. ( 2obk ypedance of the circuit increases if R increases. When is this stat 2(/bjkq bwf.k2*ho ynement 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. w,wwzem o1oq ,z;. (mzThe 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 impe t7bsf)tpe. m1whhvujg99 0f6dance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series c n --*lpkoc,ehircuit, the resonant frequency of tha--ncekh*o pl, t 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 resonmwp471 mdqs*4 kf9 vizs7cp1y*h/m fmance,

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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 cima2xc29 (7drr dq:(gqg)utv rai+at6rcuit 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 qcitn) grbaw: ,btc0)da4+ +ba uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector aregntwaibc)r0b t,:bc)aq d4 ++ 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 ra l tmji 2n0+d,-wzpma5dius 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 loop and the ma,pwj0tm2- dan +mlz 5ignetic 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 radua 5f.db u/.1n ny h+tafks)x6ius 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 thah5) +/ydf . a tu1.x6nfnukbse loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced a4a4isdi x))x0jhcl 6from $1.0 \; m^{2}$ 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 faf 1 l +tq1ofq6o5cw2$4.0 \times 10^{-5} \; Wb$ 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 2b4hr)w 8a/ ck+9tt ;ctsy3wab 00 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes 3 wctsy;/t)thbw 8a9ab4krc+ 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-58md zew1tf z 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 +ahrw qki, oj14,glp 9and area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing / xxi- +np.j74a-grrhly dztia8 0*nmspan of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field 0p+zd a r7x ha8-x*i/ tj-my4ingnl. ris $6.0 \times 10^{-5} \; T$. 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 conyb6t05bhofo5 zjkq) 7 stant angular velocity of 2.0 rad/s about a vertical a0k5zhojq)ty fbob6 75xis 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-sectional a (.uoqd-c ,igbrea 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 9q4y(wqh 8ozx of 100 turns 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 $emf$.

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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.w.yw .h*l,pcjee +ij : 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 p.ecywl +h *wej,.:ijmagnetic 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 consihx zbm39 +z1ea rcox. g2m1*aists of 100 turns 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 const:m ke*jxn3(*m qzy8p pruct a simple AC generator with an output of 12 V maximum wpmzk(mpx * *3qyn8: jehen rotated at 60 Hz. A magnetic field of 0.050 T is available. 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 geneeqhort 4- x,crtah- v :h2.e9mrator 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 have a resistance of 6.00htw+2y pi84/fx ae5 ub 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 of 6.00 W. i)t i8gv;y x7uap:j+t The motor operates on 120 V AC, and when rutp;ag8):7i xtyv iuj+nning 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 resistance 6.0 W is connected to a 24-V powerr+/ wem9 /c ;kztha1l,isqos 4 supply. The operating current is 1.0 A. What is the start-up cus,/q+ 4 k1m9loh;wz/rc tie asrrent?

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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 yfx 5 x8wy.d.wue;1jispb :+lW is connected to a 24-V power supply. The operating current isbdywx y.i+j fl:u5 .w p8s;e1x 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 to a 24-V power t9i t95 zc6hokhi0w : sx)fh1msupply. The operating current is 1.0 A at full speed. W9ctk6 h5fh )htm:0iwx1ziso9 hat is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary vov i pec:j9h *qgxt.vd4 o1gi1ib*( b1ultage 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 causew 1rqpuz9pp qqf bp7c-dtx2 : h;q1(m9s 14 A to flow in the secondary. How many turns arqh1 crp1u-bfdtqwm2 9qp ( 9;z: p7xpqe 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, hoetefc yim*- 4mdqkwwo2 - 85p:w many turns are necessary in a 110-V primary if the 24-V secone4 e8tkm -:w* w5dq-op mif2cydary 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 p;zjv(d l c-2mkrimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the ckzdl2c ;v-(m jurrent 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. Assuincgl4hq:y 5xdxc2 qvkr ( /65ming 100% efficiency, how many amps at 24 Vvklrnx/2(gxc d q4c:i 56y5h q 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 trans+,w)qpy4uh 9bd m z;t+v9n f z3vx5ffyformer provides 7500 V at 10.0 mA. The primary coil operates on 1qz 59 zdf+ym)b,v;y3vntpf+u4 fwh9x 20 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and tz7 9m(qmahn4) iyd 9v300 turns on its secondary coil. If 120 V9m9q)t mi dy v4ha(zn7 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 on its primary coil and 300 turns on its276 j+yhe3 fztdnp k:s secondary coil. If 120 V at 2.0 A is applied to the primary, what curf +z6h72 jndps3ytke:rent 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 transfor h* jx2ielh74.4dt dccmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect theit dx44hhcel*c2d .j7 output 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 a,ff4c9osf*l 0lrl( n g po+5klnd its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sef *c ,5olp9r+llk(oglfns0f4 condary 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.7jca pa3u.2vvs*y1qepv d t63 If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictiov 23 6.p1dt aayq*7u cvpse3jvnal 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 u1p2v6: *yd piolt3jyjsually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numpy1dpytli 6 3jv:2*ojber 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 wg ,7eb27nawq. The voltage is usually stepped up to 4500 V by a transformer and t7w2,ngw bq7ea ransmitted 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 stepm9mo*ldl a*ck c-+y)a-n0gv ;:lquu a ped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is n aad c;ny) m0ul+*o *v9m--cluql:ga kot stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A ge5*o-41g rumbu bofp9tnerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lor gu1omf4 -tp *b5u9bost 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 yz6.fn9hl a6eresistance 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 ene6zfa6n . hyl9ergy 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 less power would b 21fsmy5sk*,o9mgk yae lost if th9sof1s*g, mmk5ayk2 y e 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 transmitted on a liqszbhjx /g/-bm)ukr 9 01;k:xufsf6 ane with resistance of 0.60 W. To whaj f6qs/ xmgkr/- k9u1);bhf bs 0:uxazt voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much ene;ly ka,yqlaohph3 7d8bb+ 8p xw c(-;jrgy is stored in the coil's magn, ;-ldc;3 y8xqw aykoppb8+jbl7ah( hetic 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. Whahmf u/uk r(qqcu6x(5-t is this circuit's time c kxh/(r5ufuq- q6u(mconstant?

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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 x4 dz-b-s9:u iemeuj8circuit where the rms 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 fdps an/y* 0aenef2:u 92 fvu-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 AC8ck2* rvipds-+bp e dc.j7s4h outlet. What is the resistance of the lamp?7hips+d 4 c2ebjs*kr-.pv8 c d

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cuh6q0wsyb-:2c)mqz rh rrent through mrh2wh 6c:) 0ysz qb-qthe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac poe2c6- iux3r)aol6v ss wer supply. What is the power dissi slo66)x ue3a-vsrc2 ipated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through owiwh 6koi i;,;(73yc6hytkv a 50-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 re 8qxl* e2 y*o:p1l +ghwpi6hiwsistor 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 5j9fg-za ;g 2l9+uwrud0-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductonk it;bg,c .9msbf4;huk+ rl 8r 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 u+ )lvktl:n kkox-5d,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 reactanceba;q3h4x6 dl+gctc;1 po5 uv e?

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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 indubtoh6ix9fq4b: f i- 3yctive 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 w e44gdwry4 2v(hq: 8c,g10 czcay trnzhen 120 V AC at a frequency of 20 kHz is applied to it 4d(wz42re 4cc t0gzrc1qayn y8:, hvg?

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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 t))7xz.rj fm2ll:d lkzhrough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive t(3(* j erzc r7pz80i/bkeueu reactance 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 capfn, ;rjlf3 v(bacitive reactance 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 caparkg0yu k+39jj h 2pgf/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 capacitive reactance of a 0.t+wi: * -7hk.li 57tbhpzgf* ou,wcqd010-mF capacitor be 100 Wdz :k f wi75ilwhtp t+.c*ohu-7b*,qg?

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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 capacito bzv,f:( p(ne07wlm5 b:bi nqy j*t;yrr 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 impedancf6+((auv ufn ,5sudvy e of an ac series circuit with 12.0 W resistance, 15.0 W ind+u afd s5,yf(vn vu6(uuctive 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 10vxqfq;)a3w 3lw:xjh0f-s1 vr 0-W resistor, 20-mH coil, and 1.0-mF capa 3w3fl1 hvs) wfxa:j0xq-qr v;citor 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, 20-mH c kx7jakfia-q 8l4v1 u4oil, and 1.0-mF cku4i- xvl aakq8f4 71japacitor 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 conneq0z b zop9hwbm d9mv/* rgmj3z-3c1.pcted in series with a 20-mH inductor, what is the impedance at 1000jzo93hz-m9* mrmg0 bcw. 1pq vz/b3pd Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH ind;ri.v /ogf)yxuctor, what is the ph/o)vfrg.;xi y ase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuryhsn*pcrz .xo 21yp8i, y(w e7 oo:o-it with a 20-mH coil and 1.0-mF capacitor fo7oy zr yyo: -hxw,*e21np( 8ocsriop. r a total impedance 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 capacitances is needed in series with a 100-W resixjjj.v8q*i : bbphw5 7;jkj(qstor and 15-mH coil to get a total impedance of 110 W at bjw: xj .85jqh7jp ;i(jkq *vb2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for )ns 2tggen+; na total impedance of 40000 g;n)sn2et+gn 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 serieo wh( xt9u;, o//wrczbs with a 100-kW resistor at 1.0-MHz for a to/w;cxh u/, w9br zot(otal 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. Whaqpkc- 3 gs e3l7b4 8sh t9uc-ommj0*lbt is the impedance at mpsu3mg4b- 7lt08cq oe* c-jh3b sl9 k1000 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 1w,jr5g8ggqy -7 +dgcxr4 :6oesr: xl n.0 kHz for a total impedancg grg -rryljq 6dg,xcwne 8475:s+o:xe 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 ib2wc4 wtp3sjm* vf.0gn series with a 10-mF capacitor at 1.0 kHz for a phase angjwm3ft0p*w2b .g vcs4 le 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 )et8:jrvzn)al 4mq6o needed in series with a 30-W resistor at 1.0 kHz for a total impedano64)a :8qzl tv)jernmce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is thec hrkfyi 27g,u+co. qu yn ynp0.:tx-4 phase angle? -nf4c0nuh x7rkg,.2 q oyp+.ty: uiyc

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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 rpiy,k:5k8 8ljgy,3j vpe fxiy-06hgHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitoxg,jip kv 6-g8 ihef:j3y k,8lyr5py 0r 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 c9kwtznhx+ d :5v elo2dt 6 m6vc*(ubt7onsists 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 supply. Whl52xh u6 7 6 vntodt*c9b:d(+mvweztkat 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 reactan-n;;. ztw93rk)0on ffg mes+qfvw b 6uce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cu mof0w6q zeb. 3f-u;wg;v+ trsnf nk)9rrent 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 re:k1ul tov*evc 56zk1u,+c rj ysistor, a 10-mF capkjv:+kzt r1 * cueyu6lco v51,acitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle o,x:) mhhh2ksg h ,h: gkx)msh2f $40^{\circ}$ 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 f re a 7,j1+em)b8se3sv*gfkrjrequency should the circuit be driven in order to have maximum power transferred from the driving gmes3 )e jb+ 8k*ar 1f7r,jvsesource?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 1(m/pg9h x.u kb5.0 W inductih x(/pmbg.uk9ve reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC zpvoy90pg(p 2 circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a .l70svklfl.y resistance of 30 W. What is the power falk f.y0.s 7lvlctor?

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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 cp24zg kc pn0o5ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tn2 z4og5c 0pkpo a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in serieavl8bu +1h2 3ov veq2zs? 1zuvvq v 83bl+2oah2e

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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 fo(g4s +e*um,k xf:kav lr a resonant frequency of :fukv l sk4x,(+ae*m g10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7bpg ko.: 249fwuxrkn(-mH inductor for a resonant frequkrxun( g2w.4k :fo9 pbency 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 in seriep6xo dvg20kp3s with a 30-W resistor and a 40-mH coil if the red p3gpx0vo6k2sonant frequency of the circuit is to be 1000 Hz?

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