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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 ev2r3- zl0 fvzzxcept

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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 indd l)q6wu))yz-ljhn w8uction states 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 what kind of chang7 rpx,dgd; (8p-s n3d 5m8q/ wqaixggue on the;q7qdgx8,8 -x53ndu (ar igwppgsm/ d induced $emf$, 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 loopi mv-n.0( :fmhvf0 rzk of wire produces what kind of f. zm-0v( kimfrh:vn0 change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind de7wh8o 7zub ,of change on the inducehz7odb,78u we d $emf$, 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 ma4 : .ud ds(8swagv pee7ovjx e7(-w+yfgnetic 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, thee/ti x4ozje3: direction of an induced current in a conductor will be that whz e4:e/xoi3jt ich 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 t7,3mwo8rbs6x;odqvsa; w/ sk able. A bar magnet is held above its center with its north pole pointing down. The stationary magnet irw7m6ob,ssxv; ;8 o/ sdka3wqnduces (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 fltjkhoa/5fak)a(.u 4 eat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approach4th) . 5ef (ouaka/akjes 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 field vectorjq8 9dtkl.+h f points straight up. The magnetic field vanishesqtd fhl k+.j98 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 wherefm/gsrc+,y9 vut6o w: the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the w6crv yst+fm/: ,o9 guinduced 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 a region wj.t*.u/uvda gfl(g q.here the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in t(flqu gv .ta*..u/gdjhis 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 horis5hf3w ,cqx6e:3tbu 0 e 7odzizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed fr5hocfq wd 6ux3iz:7st ,eb0e 3om 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 jts2ci4bgq x)2 2e68kyajcx+ le32u jd(-cw ma loop of wire with the north pole entering first. As the n c2wge2q28jue- )l 4xjdjac(x yb+ ci63k tsm2orth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated ato0wb ej(;5ths 00mhhp 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 axish j0ohbhmw ;ste0 05p( 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 about an xrr v8m q,i9 ;yg,fk+raxis whose di; xq,kmyg, 8r9+fr virrection 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 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.) pz x*5:apsvb
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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 thn2cn .vu)ye p8at an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic f2yci9 wac (cj9um3kao2 0c4 irield. 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-west6u- (zen,serd direction) is moved northward at constant velo6dz,(eu n e-srcity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotate8h(q e (5 ;x:jh/m 7lgsbltgai/ tmki230fjrc s 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 t 7y4i13u 4jjv7ntkp vn+wzwamv);*mzransforms

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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 revolution.(vwr/+ 0gp5ksv zibof8g tq6s each second. The frequency of t/ovsw+z.qi8pgr 5 fgv 60( bkthe $emf$ 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 devi yy2.luoe.b9bce 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 deviptanw)/*s; ep s 03)f6trpfpqce 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 coixpjf aupe6906j; lhj(5bo boe,-jr 5ul contains more loops than the primary coib(9aoj55u;fohbu-prej6, j pxjl0e6l then it 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 contae u7q oc48u)zeins more loops than the secondary coil then it 4)87qzeoec uu 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, theb+ nvibo y;o- 0*jms+4hs6vhg power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonan wsljc,g*/rp*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 series2vbhwm2x*o.k.fu; fu k ,gq)i to an ideal battery of constant terminal voltage. At th*)hkxfu vu;ifq mw2g k.b,.2 oe 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 bi5hbvx t*pxct),be** attery of constant terminal voltage. At the moment contave b h*t,* bpixc)*tx5ct is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L a/wq5c:mst e:y nd 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 wivb-jvb9wqf08 cxu d;.th 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. The time const9g+q w.v5ea 20 uteil-amc us;ant for the circuit representsauw0+ e qvl9 ge 2.tui;-5mcas 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 inductor aidzg935n;pa1y 4 w7nrxu dx/ ivm:,vxre connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time , wu mxz59r:3p4x;i /dvnxnva1id7yg required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exp5b/4 sqqswz//gpjr9 cept:

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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 ciz1x4hl p2w9o a6rj y1ircuit, 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. Inr1llm9vvzhw ; m, :f*gqvy w;5 this circuit, the currentl*1ql5 ,wgvr;mzhfw9;v yv :m

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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 ci: j .p1gii11 rg-flxqe5sk pj2rcuit changes by what factor when the frequency 2i1:. jk psq1fg5lg1e-ri xpjis 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 ife fyk,oeg3*o dgw69codwi86fi /2z- nductor is doubled, the inductive reace/8*6w fd,w-e ock i93fido2zyog6 fgtance 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, thqs wi01exg 23fn8+sq-s9i, ewv sju 4le inductive reactance of that iesq w1 ql n90j 4sesu3w+8ix,fg2vs-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 z5huz( niqf51a gy8p3 this circuit, the curren 55fnhzaz8iqp1yu 3 g(t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor wdi d ;r)r25:tfq)p*hgdn lg+ when the frequency is 5qr*wit2:+ng l d)hf )rdd; pgtripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capadb +e) oy2 wuwvjwc6.4citive reactan4wb)2ueoc6y w vjw+d .ce 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 betweenzl+ xa ovy(y5)k9g o7o the voltages of the inductor and capacitor in a RLC seriey xy(zo9gv5 a oolk+7)s 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 circ (dsu ,bue5ok1uit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increaseso, (zw de)p:tax3ak r:. Wh:o(dk x:,)a a ret3wpzen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circu w4,ts r dnyhl4d8s r+pyt-+w)it 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 increpvzb: g7 4;oe ht hkexht437n;ases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both do 0o (yh6v-p.uvoma hk,1usqw/uble in an LRC series circuit, the rp k/qaov.so0 ,yuu1-(wmh v6hesonant 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 a9 c2q3 n/px ieja/5qaan 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 occl5 s;7fd btcyqyrm,2:y v-)dturs 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 0.1e/p3 tw*3vjs64n(d n* vxdkhq0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thd3hs*pktnv jdv w/( xnq3e6 4*e 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 gu -k(4uacak2 m is rotating in a uniform magnetic field of 0.20 T. Find the m c2 a4(au-gkkuagnetic 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 radiug5 ecg+sa;y/ 80 tcddis 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thd e8i gsy5+t0/c cad;ge 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 single3knqyu0zd26;oyc- oj 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 coio:gc 45nv i0kjuns;/h l changes 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 wireje pr s8xgi kmp5w;,;9 on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicurik9ppwje;85 smg ;x,lar to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire b+qzo:o(r, x3u wfhd 9o6m;rwwith 15 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 are g ren8s+bp4,3oa2tt fa $0.20 \; m^{2}$ 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 w;vc/6qrels q0 up ;yw,l4ivfz4cz (5hing span of 60 m flies horizontally at a location where the downward componentvecyfq;64uz /q; vh54scr(w0lzl p ,i 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 rotates at a constant angulahj 9izn1 s x*d+t)lvc ulch8:,r velocity of 2.0 rad/s about a vertical axis through one of its ends while in i)u :lhv*dx9 ht+sj,nz8c1l c 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 g/5:v4r o2w lsmpygu/ 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arey5mb d5 lwj3e7a $0.090 \; m^{2}$ 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 rectangula3-bco uv8lunn9f6h;rr loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which iu6 nlov8-r;9hc3uf nb s 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 yz.,*qh8:vdh4i )1 b tvfodpfx/ 9vyiof 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 :pnj;n)gx s8e simple AC generator with an output of 12 V maximum when rotated at 60s npj :e8x;g)n 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 generator wit w(qtthc rfg9z6axsy.. 2 mmu164*d alh 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 )ovvfq.*5bkf u,jp+t have 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 fk/w(prd t7 cihf8b9 (resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a back ikbf(hprcdt(7f w89/ $emf$ 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 conne;21ul98esrh-isc d yccted to a 24-V power supply. The o8uc-9crds1i;yeh2 ls perating 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 2* h* xji-y9hcc4-V power supply. The operating current is 1.0 A at full speed. What is the -cj*c*h9x ihyback $emf$ 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 24p7u/y+ueot n7/;qy -qoh / rtt-V power supply. The operating current is 1.0 A at full speed. What is the ba t t/t onqu7q/uoe/ ;h+pr-yy7ck $emf$ 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 prima,;mgrtlrj x95ry 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 priuioihc c1i6+; y:qf8j75/ cqc (niguqmary of a transformer causes 14 A to flow in the secondary. How mq7nii8 foc:5 h q ci;u/yuc jg+q6c(1iany turns are 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 many turns are necessary in a 110-V m:j 27efgg 8xvprimary if the 24-V secondary has 100 t meg8fvx7:g2 jurns?

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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-turp.wa1,au3 t1n mmmf7cn primary coil and a 2000-turn secondary coil. If the current in the secondary 1 camm na3tw1,f.p7umis 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. A kx* v( zoh38d0qowx.ussuming 100% efficiency, h*kw oq x0. vd(8oxh3uzow many amps 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 transbua:c44xns , eformer provides 7500 V at 10.0 mA. The primary cu,bsa4 ex4n c:oil 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 has 60 turns on its primary coil anddqwhs/ q0o7i6 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the6o 7q0 qiwd/sh 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 coi7w9k0wlo9 x i*tw zvf)l and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current w9kif*7l9o tw xvz0)w 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 andym,gcy 3s0 k7e its secondary has 200 turns. If the input current at the primary is 100 A, we e3 mgsk,yc7y 0can 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 hvditt982 jm9bve s z42as 200 turns. If the input voltage to the p 8emv 2tib929jdzvts4 rimary 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 seconda0ybk/ d 15 nmz/fubmuwcp9*4bry has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecpd/b0 mk1w*un45/9fyzc mb buting 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 7icz)sxowmrm 0,nz r ,hf; 08sA of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of tur80h,m scoszn7xmr;,rz) i0fw ns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The +uizm z;nc 47zvoltage is usually stepped up to 4500 V by a transc4nimz zz+7;uformer 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 i2 d(k yq8u0mfcs usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission u (fc 2ymdk08qline 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 lo,y3-w cyo4atlj03nsmc5 boo,( c.dc nal ( m6cng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the 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 transn c,,(0dcy .o5t4c- lcbycw6l osmomn 3(a aj3former 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 h25) vl;pye 5* xnpvhcbp sp:.bas a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with ahp;pvbl2*) 5b5 :ppyx.snvec 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-8z3tivvv / sh-b5oyk much less power would be lost if the power were transmitted at 3000 Vs5z hyv o3kbvvt i/8-- 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 *ocq:0zz y)ex is 440 V at 20 A. It is to be transmitted on a line with resistance of*:z c qe0xy)zo 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 an:wcp9 k ge-q7 current of 5.0 A. How much energy is stored in the coil's magn -en9c7wqpk :getic 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 r-vi.q8fskkoa1 g1e48 ) wvu agesistor and an 18-H inductor. What is thi-1ewa o8vqsf1aigkk8 v.)u4gs circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage ina+m5 x a bw/g;3mpfh1umwl+1s 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 outlet. What is th en4tp jh5gf*llyf:,t- /akc -e 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 A)o a)m7zvtee1k6 mx 4cC outlet. What is the resistance of the lamp?6eozmca)7 mv4)kt e1 x

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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 tontlkcrde,210.( n/ : ebqnxj y a 120-V ac power supply. What is the peak current through the(n.belj ,/xn20ckd rn eqt:y1 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 a8 va 75yx;v4 cmajl5sr 120-V ac power supply. What is the power dissipated in the resisjx5r l 8s;avv4m5a yc7tor?

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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 resistote;tlyv)1-2 r 3ab fz9 dfoft7r 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 relrxw9 x v 7vjbm+8-oo*sistor 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-Wil 9wjewtk:7: resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductd.u-lceo, pm2xg,m :g or 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 co h 9*pft+aeow6t.rwo 1il at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactancezag0s7 h weu t22m63zb?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necesevig* 3fpq1;be57yj:krg 5ep sary 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 d2 opr+ +dvrn3kHz is app2+or n+p3ddr vlied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 6l .ksj kq 5f+xzz 7k(5(cm30zx wqxbk.0.0 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 mbwxb 41 5d2hchnqbqy 5-,w8zcapacitor 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 ozp7c 8c 1jm3jlf capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor havexmit(r q0r1u: 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 rolg9 y)x;p wk e d;cxb pwj9u.r-w,;(yxet1t) eactance of a 0.010-mF capacitor be 100 Wwbje)1pwet(tk. ,ol-;)rwydx x x cu9p9 ;g y;?

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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 throulwa3 ku1k js2/gh a 0.0010-mF capacitor 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 resistance, 15.0 W indax2(e h sx 5qk+8y(qtguctive reactance, and 10.0 W capacitive reaqx5 (tg ( 8s+qkeya2xhctance?

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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 resistor, 20-mH coil, andf2:jux y1yau);w qkb )4 d*ttf 1.0-mF capacitor are connectedk42qu)y ;jdautx) f1*:ytfw b 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 a5:h5s fyy j(7jfne5y resistor, 20-mH coil, and 1.0-mF capacitor ary 5jn5fhj: y(7ae5fsy e 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 - cb4em+1 z3z-pomuvo connected in series with a 20-mH inductor, what is the impedance at 1000 Hz+ um1pzv-om4bo3c ze-?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whk kst5g7 4yku9at is the phase angletkgksk47u 59y 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 with a qqfkltb3cn u2 p6x27n,q*)hz 20-mH coil and 1.0-mF capacitor for a total impedanqhtpzq 2lnfc62 3n) xq*kb u7,ce of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W res c.3) akvd6bfnistor and 15-m kba. v)f63dcnH coil to get a total 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-mHb n8iqt) *l7 kbv5z*ec inductor at 5000 Hz for a total impedance of 40000 W?c8*tb i) vlqbk*75zen

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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 resistoym),ui,i 7zs 7c(ijiqr at 1.0-MHz for a total7iyzu7s)q mic,j (,ii impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacito arj cwn649sd zj2a)x 1ytnn44r. What is the impedance at 1000 Hz?ay tc n6jd s2jz4 n4)xa4w1r9n

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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 seriqoxnhlax15 k b9 1m/ys8g5)d6)xp ysies with a 10-mF capacitor at 1.0 kHz for a total impedanceps yh91mx8bn )d5xyxsa6qo5gi )1 k l/ 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,aws 8 0dpgg;2vfcijz(* zz e* with a 10-mF capacitor at 1.0 kHz for a phase d; (2*, *pgazfigw8ez0zcsv j angle 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 k.kz +zg:/s)cnc ytvz(7-r qp 30-W resistor at 1.0 kHz for a total impedance opny(z 7q sz:)c/kgzc kvt.+r-f 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF ca bivl0 jtra-7c21nh3tpacitor at 120 Hz. What is the phase n17h-2clta 0biv tr j3angle?

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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 resis65* rfi0:1sfsy emcw ixxl;z)tor, 20-mH coil, and 1.0-mF capacitor are connected in ser5smexfw r0xlz*6if c y1is: ;)ies?

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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 o vg9wqkqsiaco6-/ -7 ry1s y9a 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-1 6ig 99-yacw7v/qoos qksyr 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,qr*vnyzd -* z( a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected(-* zqzy*d nrv 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 angle for;2ltnx4j j lf5 a series RLC circuit containing a 50-W resistor, a 10-mF capacx jnt5jfll2;4 itor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series witk orv(cyt:xbu+ mm;x0ma, f9h,ljcb 5g 6/ )kqh a 500-W resistor for a phase angle o ,lh fyr :mct5u06+kkqxjg; xc() va ombb/9m,f $40^{\circ}$ 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 frequencyx+q7jt 7,lvsfe;m 8yj should the circuit be driven in order to have maximum power transferred from the driving sourcs7;8 m+fvt ej,jxql 7ye?

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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 ci0 )gb3mbpv:3 p-c .u 9+hglkvl (5lodcubz t)zrcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is: )h9 bm(pcgd 3luzogb.u3lv0 -z)vlctk5b p+ 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 circfoed/3sf i,l 2c5k:ejuit 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 resistance6l 9q xess70fh of 30 W. What is the powlxss9f 0h67e qer 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 circu41dkmle )qpl. 3y .zarit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powerd.l3k z a1.rpl)y4qem 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 freq)4+is *qu7m7ue4. (7ymf(jxes )jlw ykrg kafuency of a 1.0-mF capacitor and a 15-mH coil in series?)s7(fgxk 7s4uul qe7y ja yik.fm+e(r *m)jw4

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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 serrf 6z.v:x n0ur vb(ktwx*7;zties with a 4.7-mF capacitor for a resonant frequency of 10 kHzz.vx 6 0v(bn *7;trtkf:xwrz u?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is 0gicd,nq:aqhh 5i5:n needed in series with a 3.7-mH inductor for a resonant frequen 55nhgd,i:h:aqn0i qccy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor mustt*pz- fy* f6uq be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 ztq fyfu-6* p*Hz?

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