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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 ong7h4f)qt 1ye*iuk- nq rz5 ;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 state0lzrt ;l bobr- h 4+g:fm)h7yus 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 ofh-l)t5pu5cpc l+c90 -h p*0ttakqt rg wire in a coil produces what kind of change on the indu0t)p* cr 09hctlgtlac-upp + kqh5t5-ced $emf$, 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 thp45a ;cahs-c ae magnetic field through a loop of wire produces what kind hpa5;-c aa 4scof 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 of c9c.h7-kitk uhl j/zr* r/uy 9.wstn 4qhange on the inducezqr. *u-rhtcki w 7s9t.k/ny/l9jh4 ud $emf$, 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 field a(v7ysd .8wx eun $emf$ 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 directio8oe0ou f hr(2r*xyxo +n of an induced current in a conductor will be that which tendooou*2 xy8rfre( 0hx+s 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 held abovaa 75zwitklrt 60w 0y/e its center with its north pole pointing down. The stationary magnet induces (when viewed from t7a/ki 0y60arwtl5 zwabove)

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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. 7lp2vhlzq9v- a) 2mlrA bar magnet is held above its center with its north pole pointing down, and released. As itl )h- l2rzpvm2l9 qv7a 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 field vec2i2 p7 pe,t+kyvn+u kptor points straight up. The magnetic field vanishes suddenly. When viewed from above, what t 2epvupnk 2+,yki7+p is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vec ukr2- mx1zda9+ sw b:blk3ac*tor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced currenaw2 b1kx 3-+ *kdlmrbz:ausc9t 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 where the magnetic fi:5dw qnlu.h z-5/ifuteld points straight down. The magnetic field disappears s z:d-tq.if5h/5luwnu uddenly. 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 /85rynr ,+ or bks2edjcarries an ever-increasing current northward. Two coils of wire 2rrbn,skr 8 j5o +de/ylie 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 of wire with the north pole enteraq4 jztx 0(27ln 3ftrxing first. As the north pole enters the wire, the inducet30t2x7l afn(jrxq4 z d 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 cod y )nz5ihr,6vnstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must bi6,y n v5rdh)ze 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 cons:zp)(o fj*n9g3sesy d tant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of *fps) gz:3nysdeo (j9rotation 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.,ano/n51 n;0sazn jcnll 7 4jq
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an xsqj sj156cu 9$emf$ 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 fieifzg 5z;dsmw74pr 1l1ld. 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 moveddpgswu-dfd: w8;r: .y3 xwt qzt/ 5ap; northward at constant velocity through a magnetic .wp/w gdyfq8ztp;; u:5w3 -rtdsax:d 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 rotates at a constant anguh6b8 b mnkmokf 7vr/8,n+pjv1m*i5s wlar 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 generator1wuu-0)dwx s1jyn v t+ transforms

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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 througyjjdw 0 u2 xnzzvm8)rp fg;.4+h 60 revolutions each second. The frequency of thex4z v yu;g2mjw8d +nj0r. f)pz $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device +p .0m0ud cfovused to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a de n c(1nqcw f)hn6e:v5svice 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 thef1i06:,z ffiyn;4xik zh; dmm( swo3h secondary coil contains more loops than the primary coil theinz xm f o z1m;6ihfs(h,y4:kfdw3i; 0n 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 contains more loops t mw ;eqq5c6diy*d ws5yg8h3.ez 7 ,swwhan the secondary coil then it is 83,wewg;sqs*5iyeqyc 5d h.mwd 6w7 z 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 pow hh4 mu9o ) 0y+up9+fx56stxihts9udrer 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 resonanwzb ;y+: 1fhgb l9.krbt 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 rz wsp - 5nmma-6sw5c3an ideal battery of constant terminal vo- wncwaz6mrs5m 53ps-ltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series 6 ,i0cwyz6 9h 2apz s/xklkbsj .n70vwto an ideal battery of constant terminal voltage. At the moment contact is made xwzb9pw0a2v7.knlsz/ i0y6ckhs6,j 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 and resistance R is conzpg 6 bgn-nx) a6rg5)anected 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 zzg) u) :a 8-lm*iighhe3a fl+3cy3s zwith 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 co4e(b3 vzwg kvz3yh(; lnstant for the circuit represents lk3ev4(gz w;v (zb h3ythe 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 are connected in series to a battery. The battf33 ,r05(mhtvp )6x osbko ywmery is suddenly removed from the circuitmko( 5, tx)pvm 0yb3sfow3hr 6. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following hav+f, uu4e9fo-2 5z.pozgox mdqe the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC pamjxcf- anu,c s501/d ower 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 a18myq+x)chg)w6 x17qf obrzto an AC power supply. In this circuit, the curreno z xqybhr +xf)c6) 181aqmwg7t

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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 frequxoi2-vkvk oif5 :w /-sency is trip5 /xi2o -vvfik- o:skwled?

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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, tn)+vz,8 tk :nt i4rczthe inductive reac:ri)cntvk, +4 t8tnz ztance 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 : 5/npx(zrsx xu))pe4s o, fakacross an inductor approaches zero, the inductive reactance of that coifr 54k/, nsxau zxs(epx)po) :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 connected to an AC power supply. In this cion2k vul:nf +5:0k *pf vygje0rcuit, the currenty fjv2u f0:gv ep l05nkko+:*n

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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 when the frequ :4eq7zrx i1ble b4li7qrx 1ez:ncy is 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 ACghl qn21, kb.f voltage across a capacitor approaches zero, the capacitive reactance of that capacitor2 h.ql ,gfbnk1

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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 anglp09u4bvo+s/ at-egtw e between the voltages of the inductor and capacitor in a RLC series circuo+epts vga t 9bw-04u/it?

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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 RLCauwg4w* zkt ,5 circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit.yca *2 in1u4sh The impedance of the circuit increases if R increases. When is tcs4uh2 * 1nayihis 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 circuit i sxpv,5 , v(sroybkc7*ncreases 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 increashe6jch eiy329es if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an gn;9: zh76r qcv7mgp f+jbb5e LRC series circuit, the resonant frequency of that circuit7vjmg5;bh9gf+ne zcr6qp 7:b 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. -ymx9+ew1cv t 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 occu6xx3vnm ) 1tlqu:miy4 0wj+ gfrs 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 radiu9.u8 i1 nl(vndj9zg/v xjz;cms 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loopz98 djm n(/i;9v1ucgn jx .vlz 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 is rotating in a uniform magneir huin ,f51e *rhvls.*kx3x:tic field of 0.20 T* 5xr1h, 3vifl*si. nuekrx h:. Find the magnetic 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 m is rotating in a uniform magnetic field of 0d8n-hkj t5vj)ve -6nbt9 y 9ec.20 T. Find the magnetic flux through thenvjtye-bj-hnt v6d 8) 5c99ek loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable 1p( h kqalq ;x-hu;yz.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 changpc m16r wx(k gcp,x95pes 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 turn xf86a5y9y h8ablch3cg u5-mzamah 6-s of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced 6maca355 by8-u-h fzcyag ahl hm9x68$emf$.

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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 witexnz z,yqu5)i,w h-9i h 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 andjy e :5dvga((w 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 whb z3( mrzd4b *4lp2nuaere the downward component of the Earth's magnetic finplm 42(rzd* 3ab4buzeld 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 lon 2*xgfuh n(v1rg rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while nfx1 hg2*( uvrin a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a )+ss b-vnub15;v fq htcross-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 1030dh5pofm 6h o0k.gs52jqv2 ylv1 dgt0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm lo)m5:cl-dxs,.b:o t zxf+psuv u7k8-dz te,hn ng and 8 cm wide. The armature rotates at 1200 rpm about an axis parlu.+ oz--dt,h8,) cvpmtuszef x 57kx d:n:bsallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of quu a.o( i)jh66lfjwlt1 (g g: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 V :0s bgz(unhqg l(k+z,maximum when rotated at 60 Hz. A magnz, (bl+s(h u:k0ngqg zetic 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 genera6 ( 8uto/47k /uoodxwij yaor)tor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The madc0g9z+;( +uk v lbniotor 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 havgti(9 ffu y 3 z0dvf(mr31z4+y xo8evze a resistance of 6.00 W. The motor operates on 12 yd3utxzf 01 v3+4fzyer8( fgv(9mizo 0 V AC, and 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 resistance 6.0 W rv : +hg(1 hyawv/zla2is connected to a 24-V power supply. The operating currentr+ly v1h2avwa :gz(h / 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 toljb.n(:8 ,-hhc b:2;ve8dspbisnah r a 24-V power supply. The88:asnbd(hpvb, r lsej c2-i:.hbh; n operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal 0gq 4*pjhq8b iz0d4twresistance 6.0 W is connected to a 24-V power supply. The operadp4i4 htj zg0 wbq08*qting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to re c3 ;joan 3ee /9kr5zzwddvo4(duce 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 primarya. dr o,+ecp;k of a transformer causes 14 A to flow in the secondaroc,e+pda.k r ;y. How many 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 primary imy+*ry md:5alxuw+j +mc95lof the 24-V secondary has 100 turns+m lyum *j yoc:da+9+lr5wx5m ?

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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 primary coil and a 2000-turn b ojk.d(jrhpv/ +r61xsecondary coil. If the current in the secondary is 3.0 A, what is the current in b r+d1rxjhv/ p(6jo .kthe 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 prim1 m1qhiz6k/j wary of a transformer. Assuming 100% efficiency, how many amps akqw zi6h1j1 /mt 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 transformer provides 7500 V at 10.0 mA. The p;ku hdjquw fsi3h;1 :+lkaer(l1z 9 3qrimary coil operates rkq;;91s hzf: uwelqhlkj(3 d13 iau+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 har ri3c8szs9v*c: j6cas 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 sc*v j 69:rscsza r8c3iecondary?

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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 gn eb+ .z.ue*ljzq-.qh30go o 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 cuez bog+-. l. *.ejuh0oz3nqqg rrent 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 turns. Ifz82gvh ev kl;)6h-xer the input current at the primary is 100 A, we can expect t v-gzrh;8e62 xe lkv)hhe 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 transfor/jwgk j7+ qy1gmer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we cqj yj7w1kgg+/an 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 itsdfar(k m)/c8xsx 0qv.nynw4( secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of q/().ac dr(fskxx48w mn0yv n 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. Thewu0zgo5f 0.lnx0 )pmx1y :fw n 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 tur n fl5g0o 0upwxyw0f1:n xm.z)ns.

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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 cf,iqz x+wf)e/k5gb4z c.2vsc7v n d (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 percentage powerxvgw dzfn,(c+ekciq7/ .4 zf sv25)cb 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 uyyq+ tle km1s6g:w(: 7 ia.vvksually stepped up to 4500 V by at:qlwi:a .yy+ 71ge(ksm kv v6 transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is 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 linod1)e 1vq gkn(rji.zq9:,uf ie 50 km long 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 transmikqdq(e) ,vjgi:zu 1o.1 ir9fnssion line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resist;u6rk btm;4+ph im p.hance 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 ab kim+t; pp;6h.m4h ur 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 power would be;eyo; i)qw)js+y zn(ji kp3f+ lost if the power wfio(j; ;n+ yzew kj )iqs+yp3)ere transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 Aw,;go lg;pgk *l mkv34. It is to be transmitted on a line with resistance g3gwgvpo; l4 *m ,kl;kof 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 a current of 5.0 A. How much energy is stored in/2f6a8wgz i r*s9olqv the coil's magnetic field?oq8g6r9swa l2*vf iz/

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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 t fm8u6y69ooa. What is this circuitum f 66a8oo9ty'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 in an AC circuit where the rms voltage is 120 Vkr.+use6xhy3wr j d dr 1f-u2,?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak c-f3( czbjtikt;: +op durrent?

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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 resih5wf2kl 22nxwr cq eiu*qlq 758j1da6stance of the laxq6 ehjluq2ln c17 afk2i *5w8 qdwr52mp?

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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 )gahac73m . pgktrd/)current through the re.) dc7tghaar km3)/gp sistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power suu5w3.o9svul 2g ,oe ghpply. What is the power dissipated inlw,g s g5o9eh uv.2uo3 the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor hj 2;-ln/ipp6x nv0mvis $I = 0.80 \sin (240 t)$. 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-Wp n,w 5- ud6)/rocdnyl+b6qvl 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 resisto:n scxi9gy,k;u)vn7 ar 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 1.6(h-uw rz:3xcrc*j m j0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-nr;k6ivs+4m jj +ehh 9mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W by z le,4.kbv5of 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 inducti z .xp4z7brfq6ve 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 x-lo u8a+ytf7q. s3g qkHz is applied to.gfostl87qqy3xa u +- 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, 60.0 Hz +k6l zm*ub1 or)k(jacsource?

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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 oynli*-:)v jpdf a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reac5c5oqzk; 19kjwey2 vu sfu0,ttance 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 ms:u)3z uo+aw10-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 capacitive reactanceb)2vhucdz+id+) ,u-on lxj9 a of a 0.010-mF capacitor be 100 W?ob)ucnhu, d ajl d)x++ vi9z2-

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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 mr cos+*o g .qe -f4q+say7l6ucapacitor 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 wiql j/03rb r;sv5 u7ohith 12.0 W resistance, 15.0 W inductiver;rhj/i 05 o7s3vqlbu reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedancsiqi8ag-*9j8o ru1.ix jfs2 we at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFg.s1u qi ix9orfwsja882ji -* capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angl2 obj gw6adoh b/*8pz;e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor areaj8*/d;w bgpz2 bho6o 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 connectew8d206won tm a ie:e9qtqo6z ,d in series with a 20-mH inductor, what is the impedance at 1o,q89:t6twnmoz aqe ie6 02d w000 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 cm35sp /8s:q gqbgx ;nconnected in series with a 20-mH inductor, what is the ph3:bg5sx;qgms p8/n cqase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a umk.),p /r q:xwjt.2(oozlmqseries circuit with a 20-mH coil and 1.0-mF capacitor for a q) /2wpxm(mkuo,. tq:z jro. ltotal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 10nint (dy (: 4cxz5bf2i0-W resistor and 15-mH coil to get a total impedance of 110 W fb:izc (xn2t4y5(id nat 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 au9+ji ma b:k4z 450-mH inductor at 5000 Hz for a total impedance of 40000 W +u4ib zak:9mj?

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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 resistor at 1.0-MHz u0w m17 hgl/;rh(tkjdfor a toh;tw/m u l1jhr k(dg07tal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the i hc6+. -me;/0cxjs hch*cigy dmpedance a0.jschc d*eih/c;6hxcgy+-mt 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 jcmjku ;qi2o- kpfopwu.;7;. kHz for a total impc;puuokk jiqo7;w2 -;pm.j. f edance 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 capa36- qfw4zr dkywt )y6acitor at 1.0 kHz for a phase angle odwr 6yf3w-)ky6 aq t4zf $40^{\circ}$?

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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 wit ,*-jsduqxkb5h a 30-W resistor at 1.0 kHz for a total impedance of,ujk xdq* s-5b 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 wiz ig9h ,wq+6w-v2 nseq8c gjrv v7o-h9th a 100-mF capacitor at 120 Hz. What is the phase an7r8 cehgiwj+6nwv 2q o qvsg- ,9z-v9hgle?

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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-mH coil, and 8dm 1sda,kffcjoj :09 1.0-mF capacitjfo8smc109j, ak fd: dor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0iyo(yqm +x 6(j.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Wha mjy6iy(q(ox+t 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 azlzx/.ru.m/7nv1p bcapacitive reactance 30 W, and an inductor of in/.x1nz7zmva ./ru lp bductive reactance 30 W are 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 angle for3rk iioc/uxb2+cc s)49b,jof a series RLC circuit containing a 50-W resistor, a 10-mF capa) o3b,9cbi 4osruxc+/2f cijkcitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W ip80 b4qpz4 voresistor for a phase angle of v04z8qpibop 4 $40^{\circ}$ 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, m4)b htdk+5anjm8 t1wL = 200-mH, C = 10.0 mF. At what frequencyw jha)5nt dk1m+4bm8t should 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 5 q 84nkhawf 5mfdvq46in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is 45hkq46 d vfanwf8 m5qconnected 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 circ di,o/.dva,:xr fx yh,uit 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 jm-07,v rc r31 bopenland a resistance of 30 W. What is the power 7rbr1ecj n0p3mo-,lv 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 serieb,:bl.uy i.;ri ghh, ts RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po,hi,thl: y.i;rb .ubgwer 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-mFhad f8wsc x9.v utd2/- capacitor and a 15-mH coil in series?t d.ad2wfv -8ushx/c9

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant frt :h3lp*kg:)igb,q x aequen)g,*q 3glitbxp: ka:hcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a respxm8erb ,7mk)onant frequency ofxr8emp bkm 7), 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH /6 11*n6mvwlwvpbj jjy,3i yjcoil if the resonant nw166l *y/mwjj,jjvbv 3yi1p frequency of the circuit is to be 1000 Hz?

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