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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exkq;ab .y+ 2.6d rl:-mdtfekzh . 1ktzdcept

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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 states7(c-t -,gcmla g(yhwq 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 lor .pvl-f6 o9 fc8;ufl1dn c10 w2aionhops of wire in a coil produces what kind of change on the i vf-l9pai1o1ouw 6; nfhl rdn0ccf.82nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces cnoasz(jz,i0ks8) xf:7z6vt - 0tdj gwhat kind of chanz(zd6x a 0 70 )gjs8: kvzfsn,ito-jctge 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 diameter of a loop of wire produces what kind of change o mw4;y1p-fw .+dzceaksq 1m (wn the inducqme+kwdwy1 a4 p-s mw;z1 .fc(ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fieldfrf3, * a*hbvzh w7w.k 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 e0sh 8 kb ep.xph:(+afof an induced current in a conductor will be tha8h +(ahp0kxf: .ps ebet 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 lies flat on a horizontal table. A bar magnet is h dmr)gs:(1z d+nyu 4speld above its center with its north pole pointing mnyp+4g dd1z )ssr(:u 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 8iuf t,5ikfspd:rs /4a horizontal table. A bar magnet is held above its center w4t durs5k,:pf8 isf/i ith its north pole pointing down, 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 a table top in a region where the magnetic fec.7gwy)brx w (x4)fiield vector points straight up. 4)7(cgxebi y x) wwfr.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 ts ht vwr6*c/jtl)p 39ax3 ;jnh/ 1cdabhe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the d )acc;6jta*v3l /hjb3rt h sx/1wn9pinduced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in ugt9ho pb 67j1a region where the magnetic field points straight down. The magnetic field disappears suddenly. Whg1b9p 7uj hot6en 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 eve h5rox5u76c biqy p8lkgwf) s v5-h2u)r-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curre))lh bk5y5 w6qpu72si5 -o hvgx u8rcfnt 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 with the nol mp9fs)xs7fvy1f1g1 rth pole entering first. As the north pole enters the wire, the induced current will be (as viewed frop)f7sx yf91vs1m glf1m above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis4 e1+b +lv9a,x( - ckopqejgju whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if thj+,ev1o ejb -a+x94ugcp(k ql e 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 rot vi (ncw,ghr,1ated at constant angular speed about an axis whose direction can be varied. In a region where a1i hv(w, ,gcrn 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.:p0c:)di /v4lpwir lsm c:fo)
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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 thl2- 9;w;zhumgw*c bczat 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 magot ,q)e q kd*r0i5f4pgnetic 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 ea 2x epzrs 6mn+5ajr3+dznf (4do 0hk*ast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induce6je +40ko 5rna(z+zr mhsnp 3*d2x afdd 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 a.etkf+o r 8w;+s1h )m: yslrdengular 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,-z2jw .hx + 2tniupjzi*xkz; ;k6kxas

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotat7as a.g2-dyix es through 60 revolutions each second. The frequency of tg7i.d2a sx-ay he $emf$ 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 devik/ - zot ku29glilx;k4ce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a d q x: ng4s5)oy600lgf(u w (bbj7usahjevice 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 t4)3nimokovdi x+* 0*b rl1 b/mqnm gy.g: m6qhhe primary coil then it gg.*dbxy*mr)k+qn il bqn6omv :/0 3 mhm14iois 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 than the secondt(rwhyjwcpv..c: 0 4 xary coil then it (hypjxv.. r4w:w ct0 cis 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 it ;brw2k6wo ,gf; mzz/nput

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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 9hpp /um,x i+whdzu bx0qk7aqgtw*1 3.tfw.3 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 batvt z) ,x+-fodvtery of constant terminal voltage. At the moment contact is made with the battery, the voltage acros dvzvft)x o+,-s 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 x b;towk+fnatx7,4p: are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the b:nf 7xpt+4bowta ;xk ,attery, 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 h*rbtzyhc7q* ,a2;j ainductance 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 witv5/wnc njn nmt;w,ahee*/j, ,h 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 batyadi(*8 di7netery. The time constant for the circddyn*a 7 8ei(iuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductoay 4rrrn4umz+g 7y y8-r are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the y-uy4+garn7 4yz8 rrm 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 h3wfcak * :ttdq, twgqr r4c;2(1cmte+ave 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 connecyu36 7c,gp ellbpi)p0ted to an 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 circuit, the,q 6ck+*f10vqz orfp i curren *6vrf oi qzf0,1c+kqpt

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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 aal 5d(ia)r,yl n ac circuit changes by what factor when the frequency is triple)da l(irla y5,d?

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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, the inductive3vrvz.33 )dkd0 vy)yfr huxs 9 reactance of that i03drx) u)sy3vr3 kh f.v9ydv znductor

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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 vo *p ;drr6ki :of(,xvjl3pwt(cltage across an inductor approaches zero, the inductive reactanv:l(i3*o6 f ;tjxkrpcr pd, (wce 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. wz;8xz bmuqx.u7 ;n9+vg *rdm In this circuit, the currenu.x8+9u m*7 qn; rdzzxm vgw;bt

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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 whaa.220yf wnc/cn uvz7 ht factor when the frequency is tripley2hvz7an2cn0 u w fc./d?

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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 volx+9qlmupp q*4 tage across a capacitor approaches zero, the capacitive r4qpm9 p+q*xul eactance 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 voltab*:wm:hxc78y e-pyucjp;ka/ ges of the inductor and capacitor in a RLC series cpc bypc7j* e:- ;/yu8wxk :amhircuit?

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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 defined asgex *.dfu*sr h.(jg5r $\cos M = R/Z$, 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 circui y q ys85qpsqka2:.xo*t. The impedance of the circuit increases if R increases. When is this sy5s.8 ysx 2qak:*qqoptatement 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 impedan6pjafv1,5kyf 2 7 s: axa4zfoyce 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 inc 7/crhib5irwi 2 jts,0reases 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 .pp f5l6 gx,cfboth double in an LRC series circuit, the resonant frequency of that circ .pfl,pc5 6gxfuit 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. -wl:tlm(sgguk5+ 2 b2qtx 5gv 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 oss;vf4dthit2c (i/b( ccurs 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 uniforg rp (dd56qaht; pn+,bm magnetic field of 0.20 T. Find the magnetic flux through the loppab6 hdtd(n;,+5 qr gop 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 0.10i hd/d3mbrbpw 6dtrld1bth(,gz2 ,55 m is rotating in a uniform magnetic field of 0.20 T. Find the magnet2b ,5ibd rrtw ddz6/,phh135m (g tlbdic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10; emn h0 r9nachi;55dz m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the 9h 0ni5azm ce;5nhd;r 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 adjustable1w5rqlxsd 2r; s .;a agwv-0xu single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chan.2ocq0yalq n i )5kst 611vivgr5lp1oges 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 wire on a square frame withk1v0h,mwe +ldw+hws4 n+ebe : sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in ,+he+le wm sw4hdwkb :0 n1ve+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 and7 juo w6li2)edx(ifs4 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 an13pvq 0(s pxm d*bzb)hd 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 span of 60 m flies horizontally at a location where thesn,k/ dh.qbi/-s i l(z downwardksil-z ,s/q/n.hdi (b component of the Earth'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 bar that is 2.0 m long ro9im1ac f eh*p -hn7d4ztates at a constant angular velocity of 2.0 rad/s about a vertical axis through oneem ni1fh a 97p4c-*hdz 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 0 esw o;wtkn5,p:u4gk aie8f)50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tgtyon2(j4i;ex,gf2b2 nuf -nky(m n9urns 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 12 cm losvyyw um*a543ng 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 wyysu3 m4*v5 aT, 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 consi5l3u9jsuo, 4 8 3iaq:ds lo93mtgeapists 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 construct a simple AC generator with an output ofae836j suedy 2 12 V maximum when rotated at 60 Hzyuj a6esde328 . 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 generator wih4dyeaori l z4q w3.65th 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 6.00 Wlqe.4,id;f2n 9wrg (gz5 kest . 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 mmkv- lc8sr8+ gotor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a crvk+sl- 8m8g 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 power supm sa1ps4x( 7rjply. Thea s(s1jxr74mp operating current is 1.0 A. What is the start-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 resistance 6.0 W is connected to a 24-V power supply. Th ic/h3fe89x ise operating current is 1.0 A at full speed. fics e8x/93h iWhat 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 supply. 4d *os2ehnbm4The operating current is 1.0 A at full speed. h*s m4 4nboe2dWhat 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 kd*ffb.n.zm+qqap .opa9 v 5)8uexf6 reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A t9k8attk+6 ddfca )i*2 o.x ekdlu.9slo flow in the secondary. How many turns are ikf2)skdo d8+caxkt9*9l.d6at.lu e in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how may( x fe2-g:bdvwj4 i0y;cpqi 9ny turns are necessary in a 110-V primary if the 24-V secondary has 100 tic(i j2 ygpx9;: bw40-dveyqfurns?

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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-turv)4 :znz8iigkn primary coil and a 2000-turn secondary coil. If the current in the second8g )nzivz:i4k ary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. As 5p pc)iir9f vixk;/a+.x5vw ssuming 100% efficiency, how many amps at 24 V can flow in the s.fr;)cvkxpsxa59 wi +pi v 5i/econdary?

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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 7509v+1v -h:q .,2sk: aq cxh9u9p mxuf 8zlwkgzs0 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw shsp, uq a 9cu:zk-vlxxhv.zk8 f1g9w29+ :mq?

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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 mhd,+ 4s kf1d931 wxlc wgrf,wcoil and 300 turns on its secondary coil. If 120 V at 2.0 A is app4s,w dxfghf lkwm, rwd913c1+lied 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 coil3yomsbx0q) wbt:z n78 and 300 turns on its secondary coil. If 120 V q zb)70oysmwn3:b8 t xat 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 transformer has 100 turns and its secondary has 200 zufbg tq.3euk,ct nh8w o*/64turns. If the input curr 6kcthe,quw /otb83u4zf*n g.ent at the primary is 100 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 ea(w) po(0ec3f l8lzkhas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltaw)8afl p(o3 k ecz0(elge 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 tur0xz5o t vc7hn vtx(2k52.nsdv;xffw+ ns and its secondary has 200 turns. If the potn t vsd; xf 2onz+75f.vwhkxcx5v 20(wer input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A oftbpdw8ix 7 7-9tl 1woy current 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 number of turns in the secondary if the prixtp7w-9 bw7o 1di 8ytlmary 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 currents,/mahpv : uy ajmt92. at 120 V. The voltage is usually stepped up to 4500 V by a 2vham:,t9.m u y a/spjtransformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuk1y//q)8hlz ic6biyl w k0a e:+e.fxgkc24 geally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lobx)yic/ifcge. aglk4:eh8l0k y zq 16/ew2 k +st 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 sjq)8 q7ucv uen.,6 9vj9m vvxW. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tran,e n9vqv698vq umvujj.7csx)smission 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 lkldk 5r( egc0:ine 50 km long has a total resistance of 0.60 W. A generator produces 100 V at:dlk( ce0r k5g 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less fwigv05ycu4wa; 0 keb t;u g28power would be lost if the power were transmitted at 300w;a k 085; i v0te2gyugwb4fuc0 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 +gaak4c3cyn d5yir7. /j kou4 at 20 A. It is to be transmitted on a line with resistance of 0.60 W. Tougicnda a4k. +r y/7o yc5j3k4 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 a current of 5.0 A. How much energy is stored in t *j0 9r /a0 vvg pndut,wo-;ps;rnw9dihe coil's magnetic ov;tjgdia90,vs u0ppr ;/d-n 9nwr* wfield?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is t7cnalk6v g1sd- k5cg8 his circuit's time lk1785 c6cggds a-knvconstant?

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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 voltagecd.8w -a0f(iryio iq5 in 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 120-4t aka3 k7smf pfh9x3l9o)o0j x)j 8vdV AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistancebv0rquukbd3l f4 7/ dey0)ye 8 of the lamp y8 0f b40edq3ebul dk)vruy7/?

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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 kw9bolkimp 2r0 xq3 6*peak current throughk092xwlb mprk6o*i q3 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 d3m/as;*vlj vst;) ub power supply. What is the power dissipated in the resistorj)lvu 3b/ ;sv*tdas;m?

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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 resistop8h9m6,dqlgl jy d;3 or 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;-uoyp.hv1w qlnm.o 6 resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist/qh9avp s ntiob9 :-e,oc/o 6tor 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-s x maf)ps9/ilc6k43(s/vfwk 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 2.505u+tjn5fy(f ;g 7sedk(xh(h+dg k5gr-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 r8g-- d3v-pu)x ayz sz14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductivepu :/)v 7oob ;+apyojh 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 inductocu5iklo k; +4jr 8qk,mr when 120 V AC at a frequency of 20 kHz is applied;lc,ik j8ur54k+ om kq to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.5 idodz5sgp 56b)ncl*(0-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 2r m uh*hkd-v 3-+19 c1kenftk(ooc4 os 1zppc10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactan59 6tnnjru1ab ce 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 capacitor have a reactance of 120pp,z xhm9.r+ws68a j4if j/wq0 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 ry zl ( 1baq-ave3i3np.eactance of a 0.010-mF capacitor be 100 W ly31aqiaz3.n pv-(eb ?

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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 capacitordyg:/;rcj(/brb/ nbepv9h*r:8 n nhg 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 ;(; jvwci4g:5lo- 1qbs epnmlresistance, 15.0 W inductive reactance, and 10.0 W capaj;lci4lo;g5 :sqv p1-( wnm becitive 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 15-*o u3uigjzl*00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser*u lzj3o*iu-g ies?

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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 coil, and 1.0-mF qnd h h)d0be;-capacidhq- 0he)d ;bntor 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 a 20-mH inductor, wha6:*jnw(-ubvlcca/ffk+ p c9lt is the impedance at 100 lkcjp*v(c+ w9-bf c:a6nfu/l 0 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 tkb whhw1(8sg aeao8al;/:3t in series with a 20-mH inductor, what is the phas ahb l tkow8s;/8hg(:3 a1ewtae 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 needevc(u+a ;ohkk s*1:oh ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for uhh:co ak *+v1;(ekso 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 followiy f/faj3b qyos- 4-+ueng capacitances is needed in series with a 100-W resistor and 15-mH coil to get a yf4-fj3q eya-o s+/ubtotal impedance of 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 with a 450-mH iuziu.hey0 f)- nductor at 5000 Hz for a total impedance of 4000i zuf0yh-e.)u0 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 ser 4epe+a ,vjcsl3) d8-mkofjn)ies with a 100-kW resistor at 1.0-MHz for a total impedan3dj pcml- a)eov4sjen)f ,k8+ce 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 capabcw+z;ez 741vr sfdx 8citor. What is the impedance ac;1 +erz 4wd8sb7xvfzt 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 avbd7w drk afs 1d/(9g7 total impedance 97dwdv/7dkbaf 1sg (r of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for w1 nl,uw4: frva phase anglelww4rv fu, :1n 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 a6o1iktw-jqa c3(i8, nn tso*w 30-W resistor at 1.0 kHz for a total impedance of 45iot tcs*1q 8(j n-i, 3wkaw6no 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-qtkq8b. w8d7tm; 6f xymF capacitor at 120 Hz. What is the phase anglw8 dyt8xqmqf.kbt;6 7 e?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-m:hooc,vj3 ;*o v2mgza *f;vay H coil, and 1.0-mF capacitor are connected in y;3ao*hzvvgo,jmv *2a ;:o fcseries?

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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 100trz tx cu0 wj*l1o:v;5-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connecttltv*:wju 01ro5 ; xzced to a 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 capacitive reactance 30 W, and an inductor+al kvg 7kn:f( of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Whatk7ag+ l(kvf: n 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 containing v/qldts dshn+m :o u6qglr*9,*+et 2flj:k( fa 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected :tsdf fq:,96* mg2+ov /j( sdlhe+lqt ku *rnlto 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 wit)1xu6 z ;yvzmuh a 500-W resistor for a phase angle of zy ;1u6) xzmuv$40^{\circ}$ 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.guez th,6z-f8 0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred frz6h fgt,ez8-u om 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 ac series circuit with 12.0 W resistance1 0e;mav535 fuimn fju, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected taj305v enffu5mm;i1u o 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 circuiimm.icg6-y6 dt 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 1h(nyt z dkc,f7/2 ff dcca(+*ird:ei(mpi1c a resistance of 30 W. What is thi(+d1hrc mcyk/7 f1tfcn( zdi e(pci:a2f*,de power 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 ciexczxp6*n8pc0n+zu j 2eqn 1- rcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H+ jp02x q-nuz6ncce*n ze8 1px inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coi 96t gvkj18nlx)dfaswt:6h - il in series?klh f):wv8-di61 tgxjsa9n 6t

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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-m40h;uhrd5 antF capacitor for a resonant frequency o4ru th0;adhn5f 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 f)r 6y1nqot ,26pvjxu lllf 1+tor a resonant frequency of 10fy 61ll16rq + on,pulxjt v)t200 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 series with a 30-W resis zfacx55 /nd)*ayu) .yq))x9owxx fdetor and a 40-mH coil if the resonant frequency of the circuit is to be)u. /d)5cxad5fzx )9 fn*o)yaxqxyw e 1000 Hz?

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