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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 un2;qlxiix v7lv8 xz i37xy.fb ;its 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 t .cwze :pfxc;u c)7*+4ny slpahat 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 k5p5-syjw t ar2w6yb( yw8sn8a coil produces what kind of change on the in nba rtwyjwy56yw-8(85s sp2kduced $emf$, 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 b0jdhg+)mrly+w ;dcp8 pwkw)c 0f:7r magnetic field through a loop of wire produces what kind of change orw ycgc0))bmpfj0w+d8 wrp+l :;d7 khn 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 lo;08hbwb7gjd o op of wire produces what kind of change on the induj;o hgw87bb 0dced $emf$, 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 frhfn e axmi..gsxe.)o zr09 lb) 8,j)ixom 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 direct*w 5 ctw :p1m-l22b9kk qxl;sohkz l2bion of an induced current in a conductor will be that which tends to produce which o: lkws-zq*c 12l5 o2b pmx;29lbtwhkkf 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*x (c xxxlf2g0 flat on a horizontal table. A bar magnet is held above its center with its north pole pointing dogx*f0c2xx x (lwn. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a hd/ovnx/**go i m 2n/sp q8d5skorizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As ito8m25s oivk/n* /dpnxd/* qgs 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 vecaw.t+qrm 8ycqce3m g3 bj.p9yn6nc45tor points straight up. The magnetic fqm +y.9p68.c53 qgjtw n4 er3cyam ncbield vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regizj keb0c6-8ie)h ;l nt2i fh:yon where the magnetic field vector point 0:b2hy;ijkl8fzn6 c-ei eh )ts straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the 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-+ v lyjbvp,1yl table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed fro vj1ypy-v l,+bm 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 7as/+e)l sq xs -r1t az4,cdcnever-increasing current northward. Two coils of wire li1ac/z,e s xns7)a -t4r+c dlqse 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 entering first:w(t43e ccfu7 z*n6 ,ocmzw mw. As the north pm*f3e w z6wc 4o:mcwz,un t7(cole 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 at constant angular spepgf- yo s6hp26ed about an axis whose direction can be varied. In a region where a uniform m66psh-g2fy op agnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an iyh7 ;5vn-zz waxis whose direction can be varied. In a region where a uniform magnzwni-v h;5yz7etic 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.q0v.c v8 w, dlynk3:,)wkwtss
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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 juaz: em,f)y ,9 blpb+$emf$ 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 mag yl y.8-e a9kuiqkep:-netic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward aj .4kdy(viqj -:mj,wg t constant velocity through a magnetic field that points straight down. Make a statement concerning theq:j,jm dgk(-w v yij.4 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 angular velocity *t8ymx;6f,mkrxq: m y ytd f46$\omega$ 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 transfin.6-q2xs;f bvo 0wztorms

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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 rev bt a *vg1tx/zn;7vtuxv:o( 6dolutions each second. The frequency of thna:x ; 1t bt*otv7g6v(/zvux de $emf$ 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 devihbc. g4zi w8f33zgx* pce 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 delnowo x)n,c3)85sy25lhz r qs vice 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 f.polpjm3z:4b i :ii5contains more loops than the primary coil lbii:.5 ozpmjfi:4p 3 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 contains more nqac p.m89pxd wca487loops than the secondary coil then itd4.wcanmc7ppa8q9x 8 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, tho d29m)-ad vv/2 /ho9ru sxnsee 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 resonant circuit,0gp azhfv 0.c/

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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 inductom-/zr- njbv x5r are connected in series to an ideal battery of constant terminal voltage. At the moment contact is mb/-5mxv zrnj -ade 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 4e5 wbh+e mr-sare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, - +e5hbr4sew mthe 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 iu 4o,ex.d9m bk,ic q8w 8ukew.0ts-yanductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connecteddo3 l)eokzqx 3gc0x** 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 c+al gb ls8fn+n7 (5lvhonstant for the circuit repres 5na nl(8vlb+7hl+fs gents 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 are connecttcn 4 yn4hu14*ivv,ehmo*;c rii a(w5ed in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for tioi4cn c n, v1*v;r5hi 4(4*aywmute hhe 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 excpw1sn(jh. l2b; 0tket ept:

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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,a.i k62(.e ;:zoah:( vydf:s zrivczq 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 conneuhbk) nqt x2/3cted to an AC power supply. In this circuit, the current 3hnx)2/kt bqu

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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 chanbtnfn i,:;:nz+o +zzbga3z(l ges by what factor when the frequency is;z+zng3( ,bn baz+ln:zif t o: 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 inductor is doubled, the:zo 4vzav8kt ,j:2fwb2 5qvy h inductive reactance bf48vza :52z jv:woh vtk2,yqof 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 tg+ob9/eu:i p fp j j9lf*e,b0che AC voltage across an inductor approaches zero, the inductive reactance of tha egf,*b9pu : 9jobpl+ ijc0e/ft 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 thi,; ; paromhll5s circuit, the currentmoa5llp, r;;h

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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 freq*-xjlha/9 du nuen9a dh/-lujn *xcy 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 AC voltage across a capacitor appr,m.d;an.ll)5e hj;zqf w 6uptoaches zero, the capacitive reactance of that capacw.e )p,.m lt56; hdq;zaujlfnitor

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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 voltps 62do+uqo* vs 2qaip6 ;0pulages of the inductor and capacitor in a RLuslvo6 o2;qa2+dip0up sq6 p*C 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 circukhn ; ur6;k vty46t5u f6x/;hyo mbcm/it 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 cixu :)v2xjrm( d i1w;jt 3ddle-rcuit increases if R increases. When i-d dtemd3ujx ; )ir1jlvxw2( :s 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.pe743t/wcvzz The 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 circuit. The impedance of the circuit incre )rk k3k) bsn/ld4)wuwases 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 doc8)py td7gd1jd6frqmhx(0a 7 t*le +muble in an LRC series circuit, the resonant frequency of t*0g d8tx71q6yad dfelm cmp(tj h r7)+hat 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 i7,m 4h4 wt.vsyajfhq9jq j/l9 s driven 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 series4ro6d :ua;76er ;t iv1epuuxa RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m ii*v * /tqyv7lo*r6em ws 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 magnetito*6*y*wm7il/ qevvrc 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 unifork5kt;db a iq e,ja-o5.m 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 perp5oqe5d;.ia bak kjt -,endicular.

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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 iul3n8s)n:t3un4hd*:eu uo :eehu.ips rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux thro :n.*ph 3u )une ut3u hol:ed:e4isun8ugh the 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 single loop is reducedgj 12n6aj ai*t 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 changezc j8u6:ww*rw.n mnr 3s 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 wirfydmnk/r8ul s:*) ;42 ;3o cnzrqn tace on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If r u:ctzl8qnkn/o;)n4dy;far *cm2 s3the 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 15 turns an *k. ls4 gb1tgj0am ,xcq:r:utd 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 a+:g yj3/4kv pf2xddrvq8nt7 nnd 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 ,h( lt+pcbo:t60 m flies horizontally at a location where the downwardt tpo,bcl (+h: component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m longrla(c +jya.i h5k2qk8 rotates at a constant angular velocity of 2.0 rad/s about a vertical l 8i(5 akkh+aryc 2jq.axis through one 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 loops and a cro4zp7 pmx1p9ofss-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 area dd xj(dbb+ lwk1z/:mw -1)oun t4fnm($0.090 \; m^{2}$ 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 ihfe0s)9x qhmkadpcg 0q9 ,.fb1 )xxk2h +c)nts 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation,hxp0 e bxqnx,.1chq)mcg+st fdk) 99h a0)2f k 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 avna6a:uoc9mwi 57v 9b a26fp 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 simple8k, ajq5hw0w)h3z pg f a:fk 0p7gjd/k AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If aqwhzpd j3 :jfk00p8k7,5g h/agf k w)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 with a ma7rydn p5rxyc5, d60t rov-fd6 ximum $emf$ 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 operateu;n16 ,rwchz9bz wrb3 s 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 resistance of 6.00 W. The motor opera36+ik-x pw4o 4hck.;6t)ym fcubosr gtes on 120 V AC, and when running at full s)p3m6uo4;kg styo4c c +h6fi wbk r.-xpeed 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 r :aljqsq 0;*mfesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Whms *l:0aqqfj;at 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 resistanq3 rdg0(w fo(cce 6.0 W is connected to a 24-V power supply. The operating current i0codfr(3g(w q s 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 resistance 6.0 W is connected to a 24-V power supmg xqh:2*qu3q ply. The operating current is 1.0 A at fulxq*hm: 3 guqq2l 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 primary volt (ja+e+g3m46tim fdoffn6u 2 zage 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 transform6e +x feyj;-ryr xu+ojmr++2ver causes 14 A to flow in the secondary. How many turns euf+x2yxer+r6-;yo jv ++rm j 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 av w2+( vrci:cp 110-V primary if the 24-V secondary has 100pvrc v:ic2w +( turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists opt.nd(e73x6j7,d j tr 3rxkz.h1wx.j 8z zrcr f a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in th,8cx 1xj 37 .7.wdp (rzkjrhrnxj 6z e3dr.ttze 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..bxf6odnrg dye*m2, 7 Assuming 100% efficiency, how many amps at 24 eg. dod ,*my72bnxf6r 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 jbkons gbbjk,abvg3:p zr4)(z4*j*9 at 10.0 mA. The primary coil operates on 120 V. What does the primar*b9:)rojbs4*j3 pb a(bzzjngk4, kv gy 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 and 300 turns on its s7kfw;kuc. nw 1s5zf4xeebi)wd-; h6 zwt *cw;econdary coil. If 120 V at 2.0 A is applied to the primary, what voltag wc6t1fd. kx*k-;4ce 5wnb7wuwzh; eifsw; z)e 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 primaryuxx 2h*szs6 d/ coil and 300 turns on its secondary ch/2z d6 ss*uxxoil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sec6a fqu.5)lx dwondary has 200 turns. If the input current at the primary isud6.q )5fwlx a 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its second0apt ,e.4dqfw0xau sm*ah/2 y ary has 200 turns. If the input voltage to the primary is/a sduamf w*qy.0t 0,x42aeph 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 9- svrqcdfgab m c tyro9;048*secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictiq-t99sc vod 8g4b0 ;*ra rfcymonal 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. The voltq6 wnsm 0c8.myage 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 secondarynwmy .6mc0s8q 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 t)bg :epcw */ ;b3fmjfcurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0pje *;t) c3bw f/fb:mg 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 ;sa e k)9*mzi/l eqbqxw2kc0 .ti9dz.60 A 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 percen09wle c)2k/zqka tm;..qdi xsi*be9 ztage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total req gtzk66th5 72p;0. wzusl/tw)mt csosistance 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 t/w 0m; tut7 w gqct5z6szth26oplk ).sransformer 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 resistance of 0.60 W. An3wx*a) 3x qyi 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 perc xa w3)nix3q*yentage 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 powfc(f ur+/2o/hdvi omgup, /k)er would be lost if the power were trans,fu/hdf/ k u)o m2c/g vrio(p+mitted 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 tra ow/x/ /imlajdlr/;3insmitted on a line with resistance of 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% diwlo lij3x/mr //a;/ 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 s:+ xu0uujs) 6pn ql 3zaom13natored in the coil's magneti z6u l)q0axnpa:j +m 33nousu1c 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 resistor and an 18-H inductor.l6 u u5bd0j4ax)m4dqk What is this circuit's time consta ub)ul6 xkq40jm4a d5dnt?

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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 12p- 5s p.lo(ji 4wirj7 3.qovw:, ypjcdefh3f.0 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 outle*w5 qglj 2cr9ay7,ss)q0 u)wdh ev) rpt. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of thaqi22q1 d5(nu m9 brr w4,mfxle lamiq(u frmnd al wm54x9q1b2 ,r2p?

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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 curreagr84 , kmes.tnt tas8e4mtk.,r ghrough 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 supply. What is the power disl,iape ,7x-nwsipat7elwaix - ,p,ned in 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 resisbm2 qj*+ (ybb1rv/5qf xtt y1btor 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 r 6r4x9o;s4zr.h:d dfre; z bqmesistor 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 50wa4dgpb t1wj.hxf7 /jc/b3 8aj0(m tr-W 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 ingygm+r. hr 6ss6c9/lx ductor 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 coil at 100/ scznxt l 6qb45c dg-cga(j,40 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 14.3n1rn- t;m:xmsk zo00.ayyp bh1rmc50 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 inductive reactance atvb;vsnu ;, s.6c)1ml 0 do0d-uniirkm 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 in;w0 nlds0i.)fu ; oubtductor when 120 V AC at a frequency of 20 kHz is applied tu0 is;t.f)0no bl ;duwo 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 coilaj * g9vclh5/ gm0 yn6/k/vnz8px;v db 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 0ngle l +qk.hy cn,ww(4 red/0a 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 reactance at 10aku48gu3) ivf18hsm z 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 haq, nlh 0gei)6mve 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 capaci*t ruk+ akcbjy8b8* u7tive reactance of a 0.010-mF capacitor be 100 W8uary bb7*8 t+jukkc* ?

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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 and 5.0 Vnvvpaw6 q zbgv* 5,e4+?

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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 ci:2 bcjy9x,ozi rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanc2jz9ci,xob :y e?

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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 res6h 9dh9 c qt-vb5.okru;tg(so istor, 20-mH coil, and 1.0-mF capacitor are connected in series 6v(sgko.hhbucq9 9 ;ttr-5od?

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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 5m-e( hi, dszbuog30rHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected imh3ez iou0 r5gs ,b-d(n series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH indu)kmb+(dqkx s r 2ex)3actor, what is the impedance at 1000 Hzr)qmkb ) e+3d(k2xaxs?

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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 withk682gf skssh8uis-r 5 a 20-mH inductor, what is the p sgi-hksf6r8s2u5 k8shase 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 series ciymj+59ho1yh sf 9hfv *rcuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 15oyh5hm j19f9*fh+s vy 00 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 resistor a4l3 u2xxqwf/x:a5w bw n 4qx3f25xxbla/ww :wu d 15-mH 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-mH inductor at 5000 Hz fo3(-9vrrx7gv2 nl lk:ovdb es6 gu1 8xcr a total impedance of 40000 W?(k-72vc6 d8r u:gxg9 re3n1vlsboxv l

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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 b(nn7r 8de hoqd p7ke**j1gl.put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150( 7dq*g. ln1pred *8hoe7jbnk 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 ca/,uozw 8dcu *ohgl+o,pacitor. What is the impedance at 1u o /ulgzh+*wo,,cd o8000 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 wi- hkv azz.ixh 1ob:3ui7 3wkw/th a 10-mF capacitor at 1.0 kHz for a total iu7 /w .hzii1k-k :xo3h3 bavwzmpedance 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 isw)2d6dchi4fx c6 y *e2f,rxo n series with a 10-mF capacitor at 1.0 kHz for a phase angdd6 2r,ofhc2xe) ify6 csx4*w le 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 3vq jey6,7 wkd9pp.ow1 r6 x4dd0-W resistor at 1.0 kHz for a total impedance ow d.d4vexp9w1r7o6,6kjd qp yf 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 gkf/:; ao2 t;t1 2d8 wpz8gh(bxpf xtca 100-mF capacitor at 120 Hz. What is the phase adwokt;/z fhgpx1ta8:( pf;2b2cx8 gtngle?

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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, :yybs p.vt;:mand 1.0-mF b:;:.v mysypt capacitor 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 resis +)tbzl3psw p7tor, a 10.0-mF capacitor, and a 0.3503ptzplb7+ ws)-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 capacithhgz7 *f5bbzf n.*iv 8or of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source.ivbn 75.*8*hg fzzfbh 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 50-Ws3f92nhn :f1 brhs6b e resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powerbnh:16fsf 329brn hes 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 c2t6digirm8*cx : 9xs for a phase angle of tm9d:i8 ri*c62csxxg $40^{\circ}$ 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 ha-4w f9og2iibb etp2- gs R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency shop2go tg ie-wb-4 9ibf2uld the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resisib u4/z,0ru rl. z*pcktance, 15.0 W inductive reactance, and 10.0 W capacitive reac,/kc lr.0 zuzui *p4brtance, 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 AC circr1etqs mzj+qkl69c nqvd *.43 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 and a resistance of 30))1hpvkg/o 00 fg3g) pbmrx(qf8ym xe W. What is the power fact bxh gfm gpg )m f1xvp8/o)0(3qe)0kyror?

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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 wwe jrj s*m:di9cm(;1:xqqs:w+w 4 elRLC circuit containing a 50-W resistor, a 10-mF wem:jsi:rxlq1cj w q:w9s 4d*+wm ; e(capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in serie:(el zkc- ,y,oaab r7ms? 7ey-kb,aa(z, l cmo:r

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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 5kgapayag7.s*m7)vp7vbf9j b-z )ivwith a 4.7-mF capacitor for a resonant freque5a7b mv pvs7) 7gf*) apka- ybv9jzg.incy 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 seriimfk7 tn)a+ne3 mafr a;,(e6t es with a 3.7-mH inductor for a resonant frequency of 100+nt 3k7() ;ream,fant6i fmae0 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 seair k fm vf5(fe.x.+z)ries with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hzfe a kmx +5irf.)f(.zv?

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