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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 ua21h r:p7 utsp4 7akounits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the 1glxs3n, /qh;gll52bze*wqecz:wk) dh9 ;kl$emf$ 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 lo ydakgu80zd5 )ops of wire in a coil produces what kind of change on the induckd )yuz ad8g05ed $emf$, 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 w)7jg5* napc 8 x4i7pem3:q5swmx bvv ghat )px73am vi* bs5 wnvp:jg7xq8 egm5c4kind of 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 change on the inen0c e.9ee,pla; pqz/ duce9 ez .qe/;ppec,ale0nd $emf$, 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 frjiec6c .maidfd 5 (9fy-p:+ nbom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductooh nfl. j1ujk8e3bno 8sqo( 2*r will be that which tends to p 8obq*(.1f2 3hu8njjo ln kesoroduce 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 i 9:pcv lrzxyo3mav*.3u*g wz2s held above its center with its north pole pointing down. The stationary magnet induces (when v c rovy:*xawg2lpv*3.z 3zmu9 iewed 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 o*gx5(kd gd9l vn a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above5kg*dv (9dxlg )

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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 magneti:n 7l;.a d( :dw/pladalk l/adc field vector points straight up. The magnetic field vanishes suddenly. When viewed from above,7 / aal(ldnwad:.l/dak;: dlp 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 a ptgrb ;p 6k58;xo)sfwhere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, wh;or68t pg;)bsp afk5x at is the direction of the induced 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 horizonta+n e; fv6klqhq(p 9lh-l table top in a region where the magnetic field points straight down. ql9 l;vh k+nh6 -(fqep The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increln soqk ;,o az7tq;ex4,1k x.ghpip):asing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Wqqn) k1 .7ix;hlto s ak :ppge4z,;x,ohen 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 en.aa6jm1 skl-rxel ;/9r t i6gbtering first. As the north pole enters the wire, the inducirsam6 r ;tgl j91l k-axe./6bed current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angul8igfne(4q zx/he fm/ )i5e x4dar 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 rotedhn)/8z m(gfxe/f44 ei q ix5ation 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 aboutfqxu3n c,j;;c an axis whose direction can be varied. In a region where a uniform magnetic field points strc cjnx;;uq f,3aight 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.v:kq35 +0iy: jkn qrh0 il (l82qfhsbi
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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 hkawu,cqon,p 7ickqu/)w/) + 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 field. The h;8eibvzn,m7$emf$ 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 i : ba6v2ws/*j+k. /5ie ce7db tybxmosn the east-west direction) is moved northward at constant velocity thes/ 5mk+:x*ai o/td cvebw s6 b27jyb.rough 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 rotates at a constantlkx ,.n *z y83w.igihy 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 transforms 8mk sfn)ux+/cc:f 8pq pm1du0

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each saaxw k; lm1(c;econd. The frequency of thelw1;(;caa mkx $emf$ 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;yh8 jjrl)1nbw2 v :hs.byz2 i 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 devicev1p0zdb 8fm j,v:ghx 5 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 the primary, ;pg b89weowxl n3x8z coil thex x9 gzw;p,nbwo8el83n 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 tha d1ae,tqpb5 h/n the secondary coi/a tdbhqp51,e l then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpux3/j hgitk4k; zpv +8gt

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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 ci+ ot4mhsb r a*: a5s;zgb1wb0ircuit,

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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,ud* u ,z*llsw in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, ts*l, *lwzd,uuhe 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 t zvkf*nc3 ) rrqwb+n csf8irdn.((v-z8h4m(an ideal battery of constant terminal voltage. 8) ( -*qnwnv czzkrh nr.t ifv( 4(+f8cbrsmd3At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to alt9kync *+0gknum-(m n $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistanc(.1ez.k fl eyne 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 r88c2;:omnuvztus 6jy7pn. bconstant for the circuit represents the time required for theny2 u.86mtu7bzo8n s:;cpv rj 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 afaw(p9tvhi1 yd.. n,f battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for ( i9d,1ypffa .wnt.v hthe 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 uni- vn:zvm e*8vhts except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, thbqbr +7hv djxb8q du:6mh8)3ee 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 cul9kd6qw1)ja 0 e.h xk/qdh0 7zdu x2vcrrenx dlqu)d1xzq9hkvak/c2.j06deh0w7 t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit nargc4 ar4x:3+k gy;f changes by what factor when the frequency is tria r4f+ 4g cygaxnr;3k:pled?

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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 a(d0vbh tz *lg1jyp/d +n inductor is doubled, the inductive reactance of that inductoryhz1 l/*jpd(t g+d bv0

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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 thhp-duo jqyk0zohgje78 hf424g+3 3vr e AC voltage across an inductor approaches zero, the inductive reactance of th 7hd4qpgoh0 ykfhj4uge2jor 3+ 8-3 vzat 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 this circuit, thzr1 aat odo0)hw9;, 6/ jm0 ld.kod0cpcxxlx8e currelodaco ,zh;9 0.k w0xtp )jadcx/ox0m6l1d8 rnt

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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 circuitxa: 02damuey4j0 m4fg changes by what factor when the frequency is tripym0xd m 2jue0:44aafgled?

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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 capacs )t98n+t)w)ithe fhnitive t8wtn9) es+f )) thhinreactance 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 voltages of the inductor and capacitor in a6 xm3*o87bvq ht6 uuzm 78huqzx36ov b*mtmu 6 RLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as az+tj()ev tg ;z. x+pj$\cos M = R/Z$, 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 th1nb4po/ 7 fle-+gvz 3 iaqhgt/e circuit increases if R increases. When is this statement truegbi op-z 17/t/eal4 hgn+fq3v?

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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. Tg gyj7)s cwx5hst1t/-he impedance 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 circb2ynp6: +6vvz ix is6d z7eyjia7b0:nuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doub2 eozk2uy)w/1xim2yv le in an LRC series circuit, the resonant fyo 12ke/ym )xz 22viwurequency 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 drivo(v7/w7g ,krc,y*;xa ahujum fkp 7b6 en by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occu/nr 0hl.hqi+4*dpb 6lkw5 nz crs 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 n .g:symg.j(lcgcj z)wa-o 4y607scy0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallelgnwjy.ca604om.s (cyc ls :7z-) yggj.

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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 a2)x2 aku )hsnmv/gov 9 uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a mh/v2kos v)a) xug2n9nd 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 rad:bft2 4gaf3twsap k0x/o77gpius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an a 4f/27 gt:k afgo7w3pxatspb0ngle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loo;v2/it1tj,+y umf ,w7z vs3jvhyjdv ,p 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 changes from 0azzc1(7 e b)6yvnb;n,bkwjb $4.0 \times 10^{-5} \; Wb$ 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 o* ylos,en xc41xf* u+mf wire on a square frame with sides 18 cm. A uniform magnetic fieldx yf1ls4cu*o,x ne *+m 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 $emf$.

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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 p e3wy7sd7(f e15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area r 4iyqtk4tg)0m6yp x:$0.20 \; m^{2}$ 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 hog)lu 6eh;5yo;m fme 9prizontally at a location where the downward component of th; )ghe5 6mlof;uep y9me 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 thatrdrh /q: hwnd16)q0 ih is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through o:dq)qh1 i0wnd/ rhhr6ne of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loopswdgxjfg n+*m 0k-;0 os 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 6piijb09*gx jkbv ye:u),a ufigs/ )+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 armact5 2d+dzh.ub ture. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpmdtb 2uhzdc+ 5. about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of 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 wirxwi5: i0scgbw) t5b 3ce of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 1yj myam8xbpo2n57 er6o8o,xh j. l2k62 V maximum when rotated at 60 Hz. Am5 ayjxem,k2ln768xb jo o 2r p68oh.y 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 generats/i8jzp h dgr+:rv4ryz*.q+uy u qt(.or 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 motor operat z 8qrkuwk qv24te6cr/f43jz :es 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(sou8 y0gp4,q yt i.mm a resistance of 6.00 W. The motor operates on 120 V AC, and when run.u tq8(ims4g 0m poyy,ning 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 is connects )2 vj7yfdh9ved to a 24-V power supply. The operating current is 1.0 A. What is the start-up 79 v)shf 2dyjvcurrent?

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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 powerwm7m f 738knrl supply. The operating current is 1.0 A at full speed. What is the7wn7 rflm3m 8k 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 poq j(t cqh/s+ shoh291vwer supply. The operating current is h tq+1q/29ohh s(jcvs1.0 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 reduce a pr y k (v*p4l5fc)/mzq*y,v ubymimary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secon10 z6f l2a*kik1gmm codary.ofkk6g20mzm i *1ac l1 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 manybmh1 6 3e; gb(p2ldxut turns are necessary in a 110-V primary if the 24-V secondary has 100 turn16hb (l3;xgmutbed2p s?

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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 200 -bmmyrw0dxe;ya) c 0/0-turn secondary coil. If the current in the secondary is 3.0 A, what 00d ;r xwmcyye/abm -)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 m;kf wjxoe3s3jug)5lw*+sxr 1,rva)in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in t+w)3x;r3a5u f*e,k)1 rsvgowjx mlsjhe 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 trans ge:k+dikps/d 2-x2hrformer provides 7500 V at 10.0 mA. The prisk 2ri k-:xp+hdde/g2mary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coiley5c l4a*aupkwm79* s 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 sec eaay 7m*lp4u5c 9*kswondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil adra1xohizv(k 1p.20 gnd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pri2p0a.izo1r gd xhk(v1mary, 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 itspv i;:kd0a .cy secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondaiyd p:c;k0 .vary 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 turn+smuwbp9v wfm49 * j1ss and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can s1 fm4 wuj*w mv9bsp+9expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20xcbq f,f2 ;pl50 turns. If the power input to the pq5,bxlpfc;f2 rimary 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 of current at 1xp-e p(6 k3x zjqrk2he5 5g3mh20 V. The voltage is usually stepped up to 4500 V by a transformer an5eg zqxxk3e 6pp h5r 32j(khm-d transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is u9k0qnql8mfa/ sually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance m90q 8/ falqkn1.0 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 atn2)umt 9qs 4zq5tj4za 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitt m)zz4q5sn4t9 u t2jaqed 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 linv;* rjig+at uv76 og(me 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 transmission line, the voltage is stepped up with a transfuv g *7rat m;(j+go6ivormer 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 act 5+neicl96cph l) r5 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 perc9 6)5tc+necrc hl5ip lentage 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 g(r 76it dzlx41: kpweline at 1000 V. How much less power would be lost if the6exdzg7r1 itk l :wp(4 power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tr qtov9x do(:7tansmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transforme: q7o (vdtxt9or 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 thedme1 n5kr ou(* coil's magnetic fielk du5n( *1emrod?

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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/qgmiski;g6nfl; 11 -doi-ev . What is this circuit's tisgi 6g-divq1f ol;e;/i kn-m1me 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 voltav nz3d3wcime-vf)27t8qj6t age 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-V AC outlet. What is the u:p.ghw8rmg, 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 2 82cudiaa /0v1dq bszresistance of the ladbc0au 1d aq2s2 z/v8imp?

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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 thc:rh)ou ;d, qce peak current tuor:dc);hc , qhrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power 6 ev0f)2x srw jth);tdsupply. What is the power dissipated in the v6 jwre)tdtf)h s0 x2;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 iskiz h6ah8lmqnn92ui52-xr 6z $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor isnr4pa f8v*: sl n pxybw-di0-0q90pgv $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i:1o kb:4dmpd/w7coh- m ,uidi s $I = 0.80 \sin (240 t)$. 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 induct0mvqgrs79j i1 us9* yhor 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 0a *n3mq egn+dof a 2.50-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 cs7be b* gc0tt ng7mpmeb)40 x+oil have 14.0 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 h*g +kg;enqonl xs 4:f(pzz-te;y2v) 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 ofi-xur9e( 0 g8 lkgkjq6 20 kHz is app l(69 i 0geqg-8kujrkxlied 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-mHi/wmj fi g qwnx)f 4wl;0ed.(6 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 capk aq2ggn -nxwod))(y0m2gj2y acitor 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 W5b asaytsk0;;+u mgn7 of 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 have a reactance ofb-h48b i nx*sp 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 10m+:yfr**qr+srcz,y j 0 W? f*s,rr y+q+cjmy*r:z

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz anjvavuqtev*yi l38.i :0 fj.7nd 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 ofwpa3*f(7gu1z p vgpt r-4*upd an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0(u74*gpu a3pdt *gv-prpfw1z 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 impedance at 1500 Hz i7et6gd b9 ,snef a 100-W resistor, 20-mH coil, and 1.0-mF capacees67 gtdbn, 9itor 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 angle at 1500 Hz if a 100-W resistov5y v)(0 mz4x2 e1yesfiw9n;dc ist 7gr, 20-mH coil, and 1.0-mF capacitor are ci0f742 eyyvxsdi(; t5n)1ms 9ew vgzconnected 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 iv5zb3pu2g7 5r5.yqvmg l5 vbseries with a 20-mH inductor, what is the imp.mq 5yp5u 2l37 v5bvbvgzi rg5edance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series wih;h a e215txb 1nrofl,th a 20-mH inductor, what is the phase angle at 1000 Hb;l f2e5h11on,r x athz?

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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 circub7q6urp.v 4gd w-o1lqit with a 20-mH coil and 1.0-mF capacitor for a total impeq16.lqup-v d7r 4wogb dance 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 d36cn mc l dhz*/dju,zma*:j:100-W resistor and 15-mH coil to get a total impedance of 110l*6mz/dc,udhz m j:3nd :cj*a 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 inductor at 5000 Hz for a txeh b2ew cvzb3l0o7q5zu fc, 9w;38zrotal impedance of 40000 rb f38l97zu,;v0cxc 2zqz eewbo35wh 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 sf) pafe y9,-bseries with a 100-kW resistor at 1.0-MHz for a total im,sa-yf)fbp 9e pedance 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 se6inp f .nu8i8m7(bz gmries with a 20-mF capacitor. What is the impedance at 10gib .p788un(immnf z600 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 iv)+8ty. kwondrf 6r8in series with a 10-mF capacitor at 1.0 kHz for a total impedance 8y k fdo68)v.rn tr+wiof 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 wit.xkych4j :8kuy gj ecc:s7 .8 .su0 ;wflojmo:h a 10-mF capacitor at 1.0 kHz for a phase angle hkc syo wsmf8j.7; xco :ey4c:l:uuk0.8j.jg of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1e dn:c1v80dmlh48.o,b geknn i h-bu7 q 1h/dk.0 kHz for a total impedance of 45 7,hv8knh :gk1-q 1bb4oh/nmn e 08id ucdel.dW?

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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 capacitor at 120 Hz. What i) jg3zcrc+c a0lq k77rs the phase anglq gj+kzl ) a0r7c7cc3re?

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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 ifggatf1a(lo67l6, ahn*a1v r c a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?n1(ch ao1aga rl,7 g6v lt6fa*

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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)3w*rfk+bhjpti m:0rjc5 kqn/.:mrb 100-W resistor, a 10.0-mF capacitor, and a 0.35r *brfjkjtm/kcn:pm: hr. 3wb 5+0)iq0-H inductor. The circuit is connected 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 ira66 )k3ulti1j vi b+inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power si tiu3j6a 1 liv+kb6r)ource. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 5(m.l bv w cc90mk(roe10-W resistor, a 10-mF capacitor, and a 0.4r(mo9kve w(.1 ccm 0bl5-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 resistor for a p,1seomh(6 da1( b k)qxniuunk4 jlo, 8hase angle of1u1ub,xi(a(4kk l nn)o 6eh8d q msoj, $40^{\circ}$ 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 =-,3yt7jea/dcojj p 4d4ovb r3 200-mH, C = 10.0 mF. At what frequency should the circu37j4j r av/t -4dp3ey,c ojodbit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series p* 7 l*u;eb nivlyqt4 9kvj 19tdwk8g;circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.d 7u4l kv 8v;t*enp;iblqy k9j9g1*w t0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an ACdg( )gvf: vs5q9. 8,5dh ha-ovqw rdpr circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. ymgue7x 7+/h sgy:zm9 What is sm7hu xgmy9e7yz:g+/ the 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 serie*m+4x g9gdiuus RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conn uimg*gd4x9u+ected 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 - .9ssmhpycc (a 1.0-mF capacitor and a 15-mH coil in series?y.spc9m -c h(s

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nfn zg1p7a):jn c b3j60d7guvgeeded in series with a 4.7-mF capacitor for a resonant frequency of 10 kHz?6g 3cnzu b 7ga0j7d)1gjnv:pf

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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 se4 gv9a(8jz heeries with a 3.7-mH inductor for a resonant frequency of 10g(8 a 49evzhej00 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 series25 :e /qt28;c8ee bdel-yopkvu n,bi s with a 30-W resistor and a 40-mH coil if the resonant frequency of t-ty8 5ec,v2pk/i:2sne d boul8 b;qeehe circuit is to be 1000 Hz?

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