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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exceptb cz qt5i)w-z, d8vv+h

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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 stc 0o zd4qv7l n:l:h1ha ;rn3p+og3v odates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces ws n-g;ay+r7ysv,cw n+hat kind of change on the inducedynwc -sgy,7 +s+rv; an $emf$, 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 fn,,h-nd v.85lq7hlh7wit u7k m;vgq2 9k wvl of the magnetic field through a loop of wire produces what kind of change on the induce 9g7mlf8.q,nkih,u5w dvw nh lvh2-tql; v7k7d $emf$, 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 kid/f17reze mu.qw 3l8l-h)l gznd of change on the induce3z q1 d/ f ).wlhl7zgeem8-lrud $emf$, 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;wxb dq3 k+(xeygxm /9eaq c48 magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced cu2z (2i ) vvcoxfhb)m-errent in a conductor will be thm 2ceizv())2fb o hv-xat which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil liesduiaw9z9v 0*m xd /ch5 flat on a horizontal table. A bar magnet is held above its center widz59auwh i /9mvdc0*xth its north 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. u3qpijgg7*q(A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abovep* ( qgq7gju3i)

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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 i0oz bx-*l-xjc rez(ov*)st p6n a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what6x *lxo*-) zo s0b czpjrv-t(e 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 mam0tf z2elj 0;1ckcca8 gnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field z0 2em;8t0kaj 1 fccclincreases?

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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 topkfqp,n3oe2 g xtjq zr0*/r.e 7 in a region where the magnetic field points straight down. The magnetic field disappears suddenly. Whenez rqj3g 2/ .xeo7,q0pk fnrt* 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-increasnh :+ 5yex*rriing curren hr+rex:*5yi nt northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls thro8;u;cm d f6ptpugh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from ab8td c pfm;6;upove)

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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 win7z/g:p2ku;na 5sr l jre is rotated at constant angular 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 loop's axis ; gaj 7n/z:ur5nkps 2lof 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 jfl 9hwzk 1;zl10 gwu*whose direction can be varied. In a region where a uniform magnetic field points s09k1 j *wflu 1wlhg;zztraight 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.3sezhaso 6 wfn*o /9 x;)1huqo
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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 an 6i l 6p1:;hyfsqtw0uo$emf$ 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 field. akzqqn +h bdvq1h x7ufc; 3.*c6 4iyj( wq9r/hThe $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is mov-vot4j6q,8ldv2td w3 v /baa oaq.rkes;b/;ced northward at constant velocity through a magnetic field that points straigtqjvsav- advr k3b oq;lew.,864d /aot/ bc;2ht 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 zqh cgrncb8 kcv w;n3633y: c4/he o.yconstant 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 transfor,4kd / (2y;qj5as ch+bhefly nms

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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 ezc(9 ;7rmvv) c3e 1 g1b-itkmuf m*rd:qjm0 lkach second. The frequency of the cite*9qk uc;rg1zmb0d v kf(:mmvrjlm 1) -73$emf$ 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 usyy jf7x c2 62odhs.3xf3yqx1bed to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a de n i2avddzgm)8,8tdr7vice 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 than t,zr ufd9sw00 h ceg;w/a/:lj;ric8qyhe primary coil then it 0asy0 ;z/wcj , h8g:9cqrrlef dw;ui/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 the primary coil contains more loops tf.gfp 1b(ma7 tyk 6;i*j rkdpk4m,zq0han the secondary coil then id y1m gmzfrk7 (aq.p ;kpj0i4tb*k 6f,t 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 powyku*lrcl . p6(er input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuie86i g- i ;:tvsjbgvej830y:vh k r8qct,

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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 coe1oehipt/t v.o.eyw 3 k5gp/.nstag.eke5othpo e. y//wp 3vi 1t.nt terminal voltage. At the moment 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 ideal battery of const/sey +;la1q )p qo)rjxant terq)a o +;sx)/ qlre1pjyminal 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 inductapxz2 xp w+w36yhfya1v 6d1f0ance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L an /0k-+/ruysn( i hijrrj9 8znfd 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 gy jl3c d5ny+*a battery. The time constant for the circuit represents the time required for the current to re3j ldg+y*c 5ynach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ht2 bcn3 qt*k3ri+rq7battery is suddenly removed from the circuit. The time constq b3ni* thk2t r3c+7rqant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have 3;w gwuiik8+ih54frx 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 supply. On this circuitsgthgqt4bg67r itz401.7btm , the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curren 6f1 ay2jt3rdba td2 b6y3jr1ft

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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 cirz72jt+3dt2szt l 5e1jzdtkj 2cuit changes by what factor when the frequency szet2 jdjt25 12+ ldt3 t7zkjzis tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled,mf5.a1 7ou1,yjan b kg the inductive reactancbo7,mn1j. f5y1aka u ge of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, thebj wjzq8:a1:+ 3xnrzk inducab:1w :qk8jxrn3zj+ztive 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 thl53yzl2q5v o+3v mpy t wf7ujnpd (66)ehc2cxis circuit, the currenwxedfjqzl 5y672l2 ) tyu +( 5cho6 mcnv3p3pvt

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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 fac.4; qbw quxr:r5z 8v8gtqhn 2vtor when the frequency is t:28qwz q 4ht8ur;q5bx. rv gnvripled?

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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 t6v eo+m uv+g/ahe AC voltage across a capacitor approaches zero, the capacitive re vgu/oa++mv 6eactance 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 between1monj6+ pr/;e3. x(nnwrhj pz the voltages of the inductor and capacitor in a RLC sw;j.r n3n jp+ohze 6/(1 rnmxperies 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 circuit is defin3nj2i 2bfe4 lkjlg9q 1ed 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 circuitfo5 86w:+ bprq8 mhog5axn)m b increases if R increases. When is this statement :)8poqa h5m5 xfbw +bnmg68ro 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 impedancjlsb58 2(kb6+),(hbpjdpnf ik0e/dta h w *b te 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 circr23,xsfrji+nhi f .1e uit 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 ciqox,5s vk2i6 xd/sl/.3 ul mgapacitance both double in an LRC series circuit, the resonant frequencvdl 5om s /xx ,gliq.2uk/si63y 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 circzbl qk4qfh5 :7,u 7nrluit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit 7 nx1eq6 d;kfqoccurs 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 ujy b32hg i3il+2tkq2v niform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector lvi3 q23+t2h 2ijykbgare 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 bh q(qk ;-vmd:xc7 j*1d 8vdgka uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the d q-dv(; :hmqgbk71kjx*c8vdmagnetic 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 c5jy nugjfn34 m7.3pa m is rotating in a uniform magnetic field of 0.20 T. jcnf3ymnupj 3a74 .g5Find the 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 area of an adjustable single loop is rev/4tyo 26ovkg ju;mdv h+ ;ih0duced 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 ce;4py wt+ w5cnhanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wireyn:bt;+ bp f; u9u99xaqbub3y 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 u;:q 3y9xypt bu;ub99 f +bnbauniformly 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 a.i nsc9u vm*t)rea 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 area 42 hf1fd*0 k1jos q xzawrg sgy/lo2;8$0.20 \; m^{2}$ 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 fdo y3s4wf*h 75 ck7li.bqrt;nlies horizontally at a location where the downward component of the Eahyqifo*tn l3 74w75krcs ; .bdrth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal baigc:h 5y :k-zfr that is 2.0 m long rotates at a constant angular velocity c zh5k:iy -fg:of 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 cross1y bftn7 dtoz8rb. (srh:6; zh-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 100gsg031oryhtwb mks:. y( n l7aj5h0/)ic dz-m 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. Each loop is q)89io2ss7; ity)u jb6mh dyq12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the lonutyhdio yqqi2)78sm; 6s b)j9 g side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ang 6 z1k9.3 lwd2ryozn-bvyx7 rea $0.090 \; m^{2}$ 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 output of 12 V4.yfbov nxfwo987f a8 maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If9oa f bnwo8xf84 v.fy7 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 generato ev+wo-zhcqs(;3lzi)1wtg 7 emmi ,9hr 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. rx(wv0 b9:olm00 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. The motor operates onkp3w64i +t1toe1kj g:ewo6ul 120 V AC, and when running at full speed it go16klgiekejop wt: 6w4+1 tu3enerates 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 kw6q n .*tmbbv:x9 1lxW is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-uptqxnwx1l k 6:bvm*9.b current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.p45/ d kdr:saz a wrvg1cth+ 1fcx/80b0 W is connected to a 24-V power supply. The operating current is 1.0 A at v 8cp/cahsb5f4d: 1g/x t+da wrz10krfull 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 conne;4v9b+x2t+jy fr xpbo cted to a 24-V power supply. The operating current is 1.0 b9p +b4+v;of2x jtxyr A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary volt lq** y5vevb*)sqd fu-age of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in (rc1bx9lr 0z sthe secondary. How many turns are in the9xl0cr b(sz r1 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 necessi,wy9+p;z 3ya exyt 8zhhm c6.ary in a 110-V primary if the 24-V secondary has 6 +zxyhct wy,;p8 ima9.zhy 3e100 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. 4md/2qvh usd-turn primary coil and a 2000-turn secondary coil.2dqhdv 4su .m/ If the current 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 primary of a transnn9s8a - 6 e5 2llioy4ypb-zdnformer. Assuming 100% efficiency, how many a59 lns-i68n p z-dya2ebo 4lynmps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign tra *a 7/ *boosmg7tu/gvmnsformer provides 7500 V at 10.0 mA. The primary coil operates on 12tos m 7gam*o7v*/bug/ 0 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 3n x3brbfa5dcc17z/n has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to 5n3nd /xbf3c7c z1barthe 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 300fk in;zh,n r)ady6g/)5km- tr+jk -pn turns on its secondarr)nr-z f+kntm,) in6hgp;j -da5 yk/ ky coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transfo5 8kp;84ldsy(x lhte vrmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 10l8 e5vx( pkh48ysdl t;0 A, we can expect the 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 and its secondary og)zy d8nfj17 has 200 turns. If the input voltage to the primary is 100 V, we can expect the8 jn) goy7df1z 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 secjmd 3-v h3wdtt.0lyt9 ondary has 200 turns. If the power input to the primary is 13v0w td-3yt ldmht.j900 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 voli+lz9 rb5,ep 4.fi gpxtage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisti4l +r5b.,igexpz 9fpance 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 5 vha9l qg.w)gcurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and .avwl g) gh95qtransmitted 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 is94xy7 * ,(qsgjzq kkrl usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance ,( x9sy7 4rjqlkgzq k*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 total resibdtlgjz.76 nt4eph 4* stance of 0.60 W. A generator produces 100 V at 70 Aznd4 6e4.lh bg pt7j*t. 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 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 resistance of 0.60 yhf0i 3+oqm5xx)h0 2 oz6xbug W. A generator produces 100 V at 70 o0fbo6i 320 x 5ug+xqyh) mxzhA. 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 lza2; +l0d;1omp0a )eetzu ,co jx5sywine at 1000 V. How much less power would be lost25a;ldzmy; ) o wp0ae,+jtz cue1sox0 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 440e;a2b uj4.ube V at 20 A. It is to be transmitted on a line with resistanb .;ub 4eejua2ce of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries + + wk;+w e;dfy9trlira current of 5.0 A. How much energy is stored in the coil's magneti+r w9+ +w;edkryfi t;lc 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-.mwu0z8w+vpa7r 5fbfH inductor. What is this circuit's time constant5m+ zfw v7prbw08uf.a?

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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 cr3bezd71:j g( a)sqy*ck,qhsircuit 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 placedbamv/n qvn:5 d.5kxh1 into 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 , rzwqbel3v7kp fv at0*x (0t7120-V AC outlet. What is the resistance of the lamp tfap x3 7r *007weq,kb(vztvl?

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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 cuerc,gu96 beg (rrent t6,cgb(e uge r9hrough 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 ac power supply. What is the power phv8(9hhm f9 jw6b:mxdissipated in w:96h9 v p hxj(8bmmfhthe 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 aig ni40u01c3 vq m7hg uk ,sb7nuctmz)c:le ;6 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 resistne) 16k.3qdcvvnqo :p or 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 v pnjazd01 rj(vy0u2-a 50-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 reactancexvphlm:hc 5d99uj,h- roln8rx918ib of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coilbbl 5p+h4;ll9 anvlqn 9ahsab +us078 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 in t8o9d-hgjx6ms 8ksz)k lr5,zductive 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 necessads)m . az8r8crry for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kx 9 ::wk1llr;uo9u fxiHz is applied to uxu1 r:f l;i9wx9lk: oit?

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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 a7mp4h 8 28iuj5 ptmvxi 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 reactance of a 4.7-mF capacitor at 10 kHz jrdu4+dl :2oik4qq8 x?

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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 1a9 c jfkg3ud xn0.jo)50 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 capacito 1d4 dijs/ee9xm u***1vpeiy)4uh y(kep /iolr 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 0.010-mF capacitor bezpnyrm) d;(gutz4;v -l;k9z g 100 W(ngmd zzu- p4)gr9ylz;v; tk;?

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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 q)c2l+arb( c icapacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistanj yoe2 +w jrp:z)n/6(zvjr,r yce, 15.0 W inductive reactance, and 10.0 W capacitive reactance?,e+ry r 6 )jopjv:(z2zryj nw/

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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 154; 4ndqrjpvb+ 00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?vqr+bp4nj4; d

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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-jf72o wd0 6moeW resistor, 20-mH coil, and 1.0-mF capa7mwjfd260o oe citor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with-1lh )q rrp,ri0wd*frl wo-x) a 20-mH inductor, what is the impe *0i -rl),d rw)xpr-lrw1fohqdance 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-mH inducnwl,/4iu ,f kjtor, what is the phase angl f/nl,ik,j wu4e 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 iwhok1; mn9x6e n a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W mow k9;1xneh6 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 resisjt.ckubz 1a-8;q g1;1fibyk enu- mf. tor and 15-mH coil to get a total impedance of 110 W jkf1t ye iu.mg1cb-f- 8q.k z;;aun1b at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5y 4pazd12hu19(l w2 sa+srvpi000 Hz for a total impedance o1492l(uazapv ps+s rwd 2yhi1 f 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 100-kW ree7n7 zu,aefl8wf1 -; tbrri3 ksistor at 1.0-MHz for a total imper78;zean t,rl - uwf 173fkebidance 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 capa;0f+u bv*kjo 0f3 *ldhioog1mcitor. What is the impedao*gl0m ;fooubkf0dj3 v1i+* h nce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a to0*/knfed - y4qj9ij lzxclt)4 tal impedance of 45 Wdzcjn /lk-)0l jy* iq9f xet44?

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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 1.0gq+hb)g2zfl5;5s5 yy0c qs6 vu ymql2 kHz for a phase anb5 m5;f+qlyugq) 6ylz2sc02vs y g5qhgle 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 30-W re) ps/ byc df3fj dw+-y):xtxn5sistor at 1.0 kHz for a total im/dc -bftdpy5:j )3x+fywxsn )pedance 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 heo1 +rxwlm7ij r8 4w:series with a 100-mF capacitor at 120 Hz. What is the phase m hi8rw r1 e74xwj:ol+angle?

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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 Ho 4opduq0x ,0rz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conner 4oodp0,ux0q cted 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 conc rkpv8s 42li60ah)vs sists 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. What is the rms current in the rpk 4hv0sval6sc)8i2 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 capa)e.hp ls88rz 5 --m wka0vfzxycitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sl5ap k88yf0mz-z v )ew-h.xrsource. 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 containc 8v2aw *rb0fling a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when wlv8ra* 2bf 0cconnected 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 tszjdzr/-m; ou 7d2o: a phase angle o ;mdorz 7 u/ozj-std:2f $40^{\circ}$ 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 frequenc:4qs o+tu3y uny should the circuit be driven in order to have maximum power transferred from the driving sourot 43u sq:+yunce?

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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 cgn1oxpn: x:sz :p,h:h ircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cgh:nzhp: :xox,ps 1n:apacitive 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 circuiasy41n7 h+yt nt 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 oslu7rxgr *(bnyj/ o9) f 30 W. What is the power farxl9 (ug rb/s)oyn7*jctor?

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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 serig4ij 4gsb*2p 7 py9sgfes RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powe4 s7gg*sg94ib j2p yfpr 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 frequenvl 82:oi whwwz/ 6l-pxcy of a 1.0-mF capacitor and a 15-mH coil in series? ll xz2wiv8o:wp6w/h-

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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 capajur4; 1zgmcq63xdk2 ccitor for a resonant frequency of kcx;r2 u3d 4mcz1qg6j 10 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 3.7-mH inductor for a resonant f((( 3 /bl masq: zjel a6a(eq7 dydemaf*sq9+hrequency of 1000 6 s3ejd qaea(+y a 7/(hm( s(ba:zdqe9m*fqllHz?

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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 seriescf2)ptx* m6h m with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is fmcp xtm6* )h2to be 1000 Hz?

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