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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 arek2yi(lg k5u 8k units of magnetic flux 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 tgcu/ i x8lvkt96p7cx- hat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chdrhx f:7 kh/,pange on the inf,d/hhp :r7x kduced $emf$, 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 .: y;yswq; s3j( pneicthe magnetic field through a loop of wire produces what kind of change on the ( c w;sp:jqy3ensy.i ;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 induufbzwh(* h l6i 2ml 9-j1y gi,o(pu2pbced (z2 1ho, pb9 * ygwhu(6l l-pjfi2uimb$emf$, 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)baw9 ogq/ hl9 (z5xlko 6ijl. 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 current in a conductor willmd3 k5(px pyxqhs0c j/q g,p27x9qyd/ be that which tends to produce which of the foll cm3xd/ (x/pq 2pd qpsx7y,q95jkhgy0 owing 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 flb*b1jg xz 4r*.7 bimguat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed f4gmx*r i7bbgu.*z1 jb rom 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 mg*fcb 9dn5um ;q3k s;dagnet is held above its center with its north pole pointing s9b m;dqfg5c3;*u knddown, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on qv-w z0.z+37b abxa ada table top in a region where the magnetic field vector points straigh-bqzza0 a ax+w3v7b. dt up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where iwgy) 9hluwtkkpv1) hy 5:*d ek.(,zg the magnetic 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 fi vey)),:(p1hdu*zhi g ytw59k. wg kkleld 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 mz r ,cc f6*gma;r.w(ytable top in a region where the magnetic field points straight down. The magnetic fielc, gf6*wc;(zrym .am rd disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-incuq:.w9zmhf (z zpwh;09:wdz treasing current nortwp z;::h (dwt9zmzzwuq.h0 f9hward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop e7r(bf c i8 uan )),vonslo.q6of wire with the north pole entering first. As the north pole enters th ni7b. a)veoqrofc8(u l6s)n, e 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 angulars7n7:r 9*uusq.nw pdzl w8,ud speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down,uuqsdzr d w89*sn.7p7 lw,: un 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 abopr 54 (f:vlt ,h68zxeai4icnput an axis whose direction can be varied. In a 6zr ,:lpcxp4vihft 4e (ai5n 8region 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.x- c 5xvrpevpx6hi.tjoc9x u nq 41;.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 thao/ s zy-.hhaxw:g39vw t 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 mx9kb ap/+ :kobagnetic 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) is moved northward l62cg 8mpfvj(gc9*uq at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acj*m ql8u26fgpc gc 9(vross 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 rotatesssw h)w c50vm7sh k7e) 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 transform(revn5t. bo0 bs

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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 secondhhoi7 :u :: tmp5b,v;ge-2 vpgyl3ji a. The frequency of thej7p 3b h: lmv;i5yh:2giaeuv ,og:t-p $emf$ 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 deo(iph; ss z6:uvice 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 device th//+-j 6;rugnwenv+6oezv/ z fcwf/ge at

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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 mohr9 +x//frmw xre loops than the primary coil then itrhmw xxr9/+ /f 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 loopmtj d75 zy7jf*y6;hmcs than the secondary coil th yt y6f75cd;zm jj7*mhen it 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 indh xpr :,ke9f84o;hc7 w8sruuput

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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 resonanytb3sjcje+k dk z14))t circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery/a3vxcu (bp(ghg1hb , l zp;/k of constant terminal voltage. At the moment contact is made with the battery, the voltage across the abk(h lu ;c/hz /pbpg,1v( x3gresistor 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 :d(/tgir. p vi5mf:6cg+cls; fzyd:f are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage . t5f6:/gd cmfrlfgdc+ zpy:s v;ii:( across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is co+5k+x89of5b pus boho nnected 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 wit9 0 j5spuwitud ;is*a6nq*(vxh inductance 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. q s(9 q*9hkun.w c8hrn The time constant for the circuit represents the time required fqnw*u h8k (.cn srqh99or 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 seruy) 2avr qsmmc-2 wgcvw+/7n)nrq c):ies to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents cv2 q)r):cw/) + ry naun s2cq-mvmg7wthe 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 p,t; k*/(vn fmrh-. 7adlcnk :8flbiesame 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 a8d+ 9fddmfrrl ynuxt8oc9z3(3o 6+u ln AC power supply. 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. In this circui2 4 .de1emjw1)tqika1uz mpp9t, the curren1 1pm jzmkipa2e.1ew9d 4q tu)t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the :i o)1 rdh+ idzu5e9gvfrequencyo+ d9)i ehzguv51di: r is 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 Aq jjvo(n:qv;q05 5m izC voltage across an inductor is doubled, the inductive reactance of thvjimj0q5(;:z 5n v qoqat 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 A d*:w9dm6b+ wh )ds8(gycxu nt,j1dltC voltage across an inductor approaches zero, the inductive reactance of that coimlc8t *,dx)tbywgs 1djhn69d+ud(w: l

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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 conn* .lhkl)rbqv b ;az+9a a3zs3aected to an AC power supply. In this circuit, the currentkll )baah rzav*z;9sbq+3a.3

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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 changl;n0qmrwbbp c.lg40k-pu 8g1es by what factor when the frequency isk8rppwc glm;bul401 gb n.q-0 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 ifdtk mb zmo0/9f-/a0 approaches zero, the capacitive reactance of that capaci9 fkda bi0 /0-mzomft/tor

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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 anglv)b38ba h .dose between the voltages of the inductor and capacitor in a RLC series cir. 3odab)b8vh scuit?

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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 defilbx wzfmztuk5f a 8j(8tx.: 1,ned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R ink4p t( m;dkt+q 1aalamh,9b; hfg*b,x creases. When is this stlm b ;xa*(h+;f4p1aqmk bdt,htg k,a9atement 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 t pp2 )za;p(wtbe*f +wimpedance 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 /uha,jn..35vqrx:xzdt s 9 -vg eh5hiincreases 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 capac2xpd0 gspu g;,itance both double in an LRC series circuit, the reson2 pug; dxsg,0pant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage.fy 7rtw e7k 3*g)gq1zz 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 occurs whv*k))55 u poqvwtjoq*en

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fise-; a- 4k1npak0om7gsx5tr9 xx3 d9il iji)feld of 0.20 T. Find the mp-is7;-k94iisj1eko0a gf xlnt)dmx3r ax 95agnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m iti05r y jks5)ws rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux thry 550wtjk rs)iough 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 a uniform magnetic field of 0.20 3:xcxt:i bot44pkl8 x T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectic4 8tb:o34 :pkxtxl xor 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 sing6my;lj25 qu)azd 8 fbjle 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 chan;z0gd*j w)a wgnor,z(ges 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 (knos pdd 7z.p48sw x q/t 7,spx2q hkh.9:svbturns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane s/.k9p h4t7oqdqh p8.xxskb p:svsn7wdz (,2of 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 cx*- 0d-dixqz15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area 3 y;npgi vkm k6r*3ea3$0.20 \; m^{2}$ 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 (saf+jitp*.jlniy 0 7x -p2agrbt5v 5at a location where the downward component of the Earth's mag5(ligatipj5- .0 txr 27b*ajvy np fs+netic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotatesqe 367ku(mebgsrnq0/ at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its 3nqb0eek mq/u76( g srends 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 5025qor bne,,pin(g4 yc 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 o5qb .vgdmhg, 6f 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 armaeq:nzd f3 8li x;bgnaz0c/d3/m9k-k ature. 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 fz n d:093kaqd/bzc elin k-8;xamg 3/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 ofb0 m(i p4 tvt47bt:cjt 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 construct a simple AC generator with an output of 12 2ou(mt zu1n/vV maximum when r/ (ozum1vnu2 totated 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 gener b0i84zrlrn5;j l0 yxvator 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 hahfp o8f(-zq.i ve 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 bvkgk)ky1-q -buk( eaa bjv9hj9 6a resistance of 6.00 W. The motor operates on 120 V AC, aak)b kqukv (1 b-96yjeb-akhv9j/a )gnd when 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 resis 2+p*g1 nn*,ok xiclyntance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the sx i*n1*k oy2nc,+pngltart-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistkk q-q1g;nb- tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A akkn 1;--qbg qtt 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 2 uc4mxq(:8qn7 mvu y.3utd3ir4-V power supply. The operating current is 1.0 A at full speed. What is themn3( 3yq d8 4v.u:tuc rm7uiqx 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 pu 7 fnz3oiiw( jkloz8,cg0mv k5 t1p4)rimary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seco m zf)t:ye .ww5ro y9ef,)x+j:;pwnbv ndary. How many turns are in the secondarye)f y )5jn;.9v:x:+f, bt mzw wperowy?

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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 17-qc7s v*(;jszy h 7n6qudusi10-V primary if the 24-V secondary 7(d76ssujic * qh7vynq -us; zhas 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 pri q(q4a7u4ony9w /ln6x 8jds+aesl ts -mary coil and a 2000-turn secondary coil. If th -6+4a8ujs7t lyden94xnslw qs q/oa(e 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+00b e k+j .p+d ojr+iqi-chha primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondajq prbih 0ie -+ ++d.o+h0jakcry?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The p i-+flw -sj56e k5.gbvnuyn 7frim5i bf5fl+ kng n7y6 -ej-wv.suary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer 0:ducvpu --scn1ukk/ has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seconu/-u0npu -:ds c c1kkvdary?

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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 itv.n-v k- f4figs secondary coil. If 120 V at 2.0 A is applied to the primary, what f.fn-4k-vi vgcurrent 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 transform9v4j4 n qar/l2,knbtt er has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary t,tjtb 9/4n2lrnk vq4ao 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 transforoiw6 m n4j;4yrpy7h( ymer has 100 turns and its secondary has 200 turns. If twpy4r6m(j4 h7 o;nyyi he input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tur l/(re4lsf zv;o*e-i -f. 7ccsw3abicns. If the power input to the primary is 100 W, we can ffo c;s-3elszi-(lviar7*4e cbw/ c.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. 9csbqaxm rjb0- /ulw d() :7y;6n5f yvrgc1h sThe 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 number of turns in the secondary if the primary has 200 turnswrcyjsgml7 n)d1u-v f 96qh b(5bsa: ;0/yrxc.

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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 cuzg sob59cphssf/+ 2a:rrent 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 pphc+b :9gso2/ fs5sa zercentage 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 ste)j,ceo t sr-d h0ukfy9d e4s(3pped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage) jsuhfkcero0d, t(eys 9d34- 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 resistance of 0.60 W. A generstl: kl6f8 :ocx+u vi7ator 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 lost if the transformer wlv8usftx : ic k+:ol67ere 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 ofu-a 0lrr,,hb:p e0o :b6t aoin7gk1bc 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 witurko,t6iaba 0b:0 rol p:-e ,bg1n 7hch 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 dh; vv5+4q1czpmzlo+ nown a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instea zzv+ + onvqphlc5;1m4d 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 line yl pd,60,zpcxd )a.y zwith resistance of 0.60 W. To what voltage must the generator output be steppeczd laz6yx,d,.ypp)0d 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 2 moz- npmi:c-lcmi(5A. How much energy is stored in the coil's magnetic : i2p-mm c5c(oz-lmnifield?

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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 aedw 8( j+.mfoxek qc2j2wt4z+n 18-H inductor. What is this circuit's time constant8w+ot +efz4ej(xwq22. cmj dk?

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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 6 b :hxzu:-x3r-pr)* kxrtw w +wstul+g:uoc 4in an AC circuit 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 outle5jf yq od/35se7xj *qvt. 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 outlet. What is the c.j )2w-) zqxnk jr.dsresistance of the lam2j jkw d-z)qx)src.n.p?

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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 c 1d9c)xg*lmqsy8j s6 vurrent throux8 yjqc m61vgs)9s*d lgh 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 prs 7q: vq-jp.-fe:wv x zkhg 9e, nlno*7s)2bgower supply. What is the power dissipated in the:s, .9r*nznw7 2sgo- :-jhef qk lbvev7 qg)xp 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 a 50-W resi):w7uqp l6oizlb6b 4x.gdso 9k zcc/4stor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor iswd+of-8.a tns6b.e8r g vwps) $I = 0.80 \sin (240 t)$. 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 resistor .c d-nh;xdvna2 x-r0vy w3sm ;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 inductor at 6)g -2aod9q7xlcr 2uhnjmd*( o0 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 coil ktgra 8kv09q s(6z v:mat 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 r 6lym: rth m ap 0gl6sdn9/bqk bpki/,2mw0w:0eactance?

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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 bwm hk 5d31w pq8,j0c0( vfnqsfor 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 inu cnw/vhh)j:tao7+6c ductor when 120 V AC at a frequency of 20 kHz is applied to o/ n h aw+jh:7cc6v)tuit?

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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 throbz1yz0o)gq 181 y;gdau,nh2rya:l zjugh 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 reactance of a 4.7-mpssqa n6k,5 j*F 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 4+nkx0. bbd0etum*y lcapacitive 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/emla- sqd*. gondauz9 ;7-eb-mF capacitor 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 cap5pmdkx8ybg /dp 0h+ ne .)mjx ;e.g.eyacitive reactance of a 0.010-mF capacitor be 100 Wggpkjbxe yh5y) dmp;8 0nex+/m ..d .e?

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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 an6s *sk0lui(pt 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 6 hsq0 aq:9blscircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cap a0: lqssqb96hacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W rry,r1ht s9+nfesistor, 20-mH coil, and 1.0-mF capacitor are connn f+yh1 rt,r9sected 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 res f 5pek6,(yig*:ekiq ozemo ;2istor, 20-mH coil, and 1.0-mF capacitor are c6 fz ip;*:eo yeoe(ik,mg5qk2 onnected 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 a 20-mH inductor, what iszl. etrd *ctqn. /p l/t(t7t/d the impedance at 1000 H //qlln pttt. z(etr./ *7tddcz?

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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 wit c 2egop7w/m0mh a 20-mH inductor, what is the phase angc mmo/p02w ge7le 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 circuit b b0dv4 )zeae0v/yx l*with a 20-mH coil and 1.0-mF capacitor for a total impedanced v la xb/)zb0*4yev0e 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;p h c)6u.qks+a b;dyhb3 xdn2 is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of cn.3uqh2 p d+ysa)bx; h6d;bk 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series ;.myc kz/*(gmlb9 *up,qpxush,c gb3with a 450-mH inductor at 5000 Hz for a total impedance bq*g .up,pcmlg*(;3u,c 9bzmk hxy s/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 i 1ns9wq t0bct7f.fgx* t(ul0sn series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 k1l7sttf*bq s fn09gu wt0x.c(W?

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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 c 5hd:9hf pj38g zgn)pi x.i8qwith a 20-mF capacitor. What is the impedance at 108ph: ip9fzxc.gd8g3h q i5)nj00 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 s3 n)z f: ujzbb-f.66qyihbq- at 1.0 kHz for a total impedance of 45 y zq36hijb qs uzn.:b)-6- fbfW?

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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 *55 fhjw86szi3ybbjwwith a 10-mF capacitor at 1.0 kHz for a phase a3fyj5sbw8 b6h5 w zij*ngle 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 seri 6 v1qdu2vr6d2 5r/pk/ww xbnxes with a 30-W resistor at 1.0 kHz for a total impedanc xvu 6p d2rnkwx1/v/qbwrd26 5e 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 q:1nhbv 3o, pgwith a 100-mF capacitor at 120 Hz. What is the phase angl,31oqng : vbphe?

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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 ifg u wdz1sm (a-kdq204p a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series0zqka 2ugw -(dpsd14m?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 1a5kbeu: hoab0hp1 +b400-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to 5abh+0b4ea pb 1: khuoa 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacel15 lu5xz;a pitive reactance 30 W, and an inductor of inductive reactance 30 W au;l 5pz 5ae1lxre connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase ang.;nib n/nc3n;2okh 4b2ak d alle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.4nnb n.b l ;2ki2kc ando;h4a/35-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 necuh rnpa vg.k6iw7 opqy;8l4 -,essary in series with a 500-W resistor for a phase angle of.,r4kp v6 y-qanu 7gp;h8owli $40^{\circ}$ 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 = 200ikykck 0e +c6;-mH, C = 10.0 mF. At what frequency shouldc6kye+ 0k;i kc the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an a:n+.uz fg inol67 nd ((x1hahuc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pnua h1nn+hiuxf67z (ld go .:(ower 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 circuit is rm,9hmi k1 l(9z5e57h raavtf $63^{\circ}$. 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 resu0, mx 3o)hswyistance of 30 W. What is the pow3m,uyw0)h sxoer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit)x/c.ry,no riv 8rf;0tp 8ag f containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a f.rrp0 /fy)tc 8rgonvi8; xa,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 11iqxi57 f x3yj.0-mF capacitor and a 15-mH coil in series?j5173 xxqiyfi

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is need65yd)j37l4 gcj e46y bdpzuewed in series with a 4.7-mF capacitor for a resonant frequency of 10 k e7ydjb5g z6ye4u3)cwp4d6 j lHz?

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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 frctkl: +iyjvmh8- r n-3equency of 1000 Hz -c+h8:r3mjil- v tynk?

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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 series with a 30-W resistokwd97 vae,5on0j obxp9n- ymb7 ,sia ;r and a 40-mH coil if the resonant frequency of the circu9d n 9nejbama0,,7vsx5-booi 7 y;wpkit is to be 1000 Hz?

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