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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fle,9w xsg. ovz2mcm6vl09q vp3ux 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 ind9o*n8ul l pw:quction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of l4aff:p g; vfp xt6ps,v7 btefs-45h8voops of wire in a coil produces what kind of change on thpt s 7;p:bpfff8v44f65 a,-gh exsvvte induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic mk(yr3hnq 2r1 field through a loop of wire produces what kind of change on th( rn2kyh1qrm 3e 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 produc )q f0 bui2(icy36kooges what kind of change on the inducoyc6)i0ig o (uq3f2bked $emf$, 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(xr/ 1rsjjg3s from 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 lav 3p)qxx7lz -tw, the direction of an induced current in a conductor will be that which tends to produce which of the following effects? xzt3l7pq) -xv

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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 aboveuevzu2pt.wk,**en o8l8(o rf its center with its north pole pointing down. The s u ep* o8kfe,ot82zl *rwuvn.(tationary 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 horizontal table. A bar7bodv03heh 0 k magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viev hhd3bo7ke0 0wed 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 w 7i bopmx9of.cvw11fwcx8 3;a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?i9f7v1p ;w.w cxwfmbo8 x 1c3o

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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 vd4b.6i,vpxdym b0 5dtable top in a region where the magnetic field vector points straight upi54v pd,xb vd6.y0mb d. 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 horizontal table top in a region where the magnetic fieldpocy -a+g w9(6 kns;mt points straight down. The magnetic field disappearoa m- 6kg+ sy;wtcp9n(s 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 kwo*fatmt+p+yq6jc 7 k2+q k- carries an ever-increasing current northward. Two coils of wire lie flat on pj+qak*+62mykcqto 7 +tw-k f 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 ofaj ,+kb4j0fj5 mcb9* yf* qftf wire with the north pole entering first. As the north pole enters the wire, the induced current will bebk,c yqf9* fjjt5+m j4b *0ffa (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 s gxhmmd 82o0-kpeed about an axis whose direction can be varied. In a region where a uniform magn0go-x8h dm 2kmetic 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 axis ;uib94o-v +i9t;ti yx ewn.u g08rstawhose direction can be varied. In a regixw9 -n9o+gu8 4 uty v0rt; siea;itib.on where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.ia 6 c8*xjo5zsd u/0ec
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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 l qg+r t 1e)rmm //qjnrkp.78cthat 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. ubd/7k vi.k ,qa- mah03dc/zd(xhm) o 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 direc e;4 ns1j4bvcmze+:yqtion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concb ej;cve4+1m ysq4 n:zerning 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 0y h.j; y+-pe 1yjrvxnwu n9sc8vn6v8angular 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 transformx ws2 lc,/qsq;s

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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 secon95(o,kw6 huax)vdw pa d. The frequency of t(dxhaa)puwk5 ,v9w 6ohe $emf$ 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 used-o 01 ph +,dz,edc:f usl*gacb 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 device thhd5ew-ngu(d1 f38tr)mwph m , at

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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 pri j qn+3nwz*y1umary coil then it1zuj 3n+ qwy*n 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 than the secof8u sdz,0lkkn8 es92c ndary coil t2s,cnul0 8f9s z8kked hen 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 po 0n+h4jx91d0+hhdpi(wzuq uc wer 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 )/u :z /bv)dscng,nxv:i zk,z e*1ecc circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of u cm3i;ck.5xu constant terminal voltage. At the moment contact icum;ki53c .xu s 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 c,caign yt:w9 a qdi e1y/nsqej:;;l 4+onnected in series to an ideal battery of constant terminal voltage. At the momendy4ge 9lie; ns ty:ci:; 1w,/q njaa+qt 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 isv: v3nt+ pd/8shb p8ch 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 inductancjr8m;s +xnf hc /auqoz(733 cle 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 b32lpz2-cnsm s attery. The time constant f3 l2-zsns 2mpcor the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batt1hjt b 7:l;fzx sl+(rrery is suddenly removed from the circuit. The time constant for of the circuit represents the time required f +1:j rtzslbl7x(;rf hor the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except:ti6.ozcq-p639k zze l

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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 power3s(zmoaah dl5eg( gub1il :- 9 supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the currmsk de./wk ri+*.k3lpen .. +3ledkm/wpirk* kst

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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 freqc67m im/1m0 qoi(,almh7 mwu hj*0vzcuency is triplel*7um0h 0amhc,zmo (j ii1m w v/mqc76d?

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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 inyc9eeov y7u2q+s7tf9 6 ek 3clductor is doubled, the inductive reactance of that ino9fqclse y2u+ 7ct 3e9vye6 7kductor

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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 ac ce720d hd-0h2p0o apq:af wrlc1vl+xross an inductor approaches zero, the inductive:0a1hl2f vcxwcoq7p+ dd2e 0h0 plr-a reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an A6ex1veo*/ qwop4-k ayC power supply. In this circuit, the current*vqw-e k e/1oo p46yax

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive react,l oqp0d7dq- qw*)hbzance in an ac circuit changes by what factor when the frequency is7 hqb p)ql-dd ow,qz0* 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 voltac;pln(*,u1a y rzc 2avge across a capacitor approaches zero, the capacitive reactance of that;p v ,aacyuc*(r1znl2 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 induct*aj xo0eu.0a4ggpnj . eq48thor and capacitor in a RLC series g.ua 0 4tna .jxg8*ee oh4jp0qcircuit?

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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 RLlhyca127,qgy/f2 mqu C 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. The impedance of thvyc*lp w1kknf,unuh s79 6: 8ve circuit increases if R increases. When is this statement truuh6,wfv97nn kvk8*su cy1 p:le?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circui4am(zu qk kqa 5eok4-)fe /7fnt. 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 impedan f5 mre611yz.6s )qnvqg; zgei 53kqdyce 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 double in a3t ,(n-ufcvt b8g+ ,l*yafsuf n LRC series circuit, the rev+* 3 (lba,y,t-fnf ctu8f ugssonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC a,-kdth39jvj0rzucpc usgk -586k, hupplied 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 circ4o eq:fz-mj.z uit 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(hkm*j175g9dy ) bnvgw:i vl x 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find gyhx bmnj w* )v(17ld5vgi:k9the magnetic flux through the loop 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 magnetic fieldcsrrp3t/l ,a 5iuq9 o/ of 0.20 Ta,liu/9t / rq53o scrp. 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 magnee9dzg -/.xc rvtic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetdce9-rxv/z g. ic 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 sing8el2bocp76v wle 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 chank m62 tf,kdaxt3l/* neges 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 wodsllpt;i5/5 .x -ln4(edqa200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil5s(a elli d4- tdlx;qn5w. /op. 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 15 turns and an area ogd h4 z-e7t1 2qzxzhi/f $0.40 \; m^{2}$ 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 fsw2(iraww9qh -5 em6and 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-zznu4 ix7d nc+udn g.dyy5,, 60 m flies horizontally at a location where the downward component of the Earth'y5un+id,7z -,n xunc g.d d4yzs 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 lony, tygh5ojwq *7 91m/rblkxn5g rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic7,l* g/wr5 ynk9b qh 51xymojt 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 +/f7hc0dyjuu9 hi o+c1 p2otp has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wirezb(jx;*f 2m46aex7naa4(q 9 z hlnguy 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 loop0gi9o-7(0l1jniwbhy n.kd2 prd7fl vs on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parap7ig.id y(2ll00orjhv 1d79-nknb f wllel 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 consistsb0 pqor7 dc-4-p /wgfxko *je5 of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an ou)up vxj0ulz+yqf vuni, 22;df6 iya t zhu)74,tput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotzzxuy fif 20,,vdvujp)lq26ut 7 ;hna+y4iu )ating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wit b2tq9baqfp j5qx887ivn av;8h 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 6hrcn vmr.,vcluffbx5 b; )9. a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motodqsbw 4;,z /sj mqlp;9r have a resistance of 6.00 W. The motor operates on 120 sp /j qd q4,wls;m;bz9V 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 is connected to a 24dklrr38pbom,z 0 4 (7i arl/dk-V power supply. The operating current is 1.0 A. What is the start-up cumbl kikr/ 08 ,p ldr(zorda734rrent?

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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 qv-l1vi.8p3o9lt n)d vcq(ce power supply. Thel v n8p)9. tl-c1iqqde(3o vcv 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 resistance 6.0 W is connectr k1vc2 +i9dsced to a 24-V power supply. The operating current is 1.0 A at fu91sd +ccrvik 2ll 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 ne.ad,jjx kc /l6eded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primarw mrjthy6(;7by of a transformer causes 14 A to flow in the secondary. How many turns arbh rmyj76(; wte 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 if the 24-Vvakq*gl35 rk( secondary has 1q5vl3(k* r agk00 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 of a 500-turn primary coil and fcofqc 4n4 p4q q+5y)za 2000-turn secondary coil. If the cur+nqq444ffcp cq5)z oy rent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiency,+fqy t+i pstnl p e6;tj 9)d1(d*no3sv how many amps e16nfi3q)pstt p;otyv+d+ ( dl*9njs at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The8p gqh1n.ad 6i* 2mmv)js9w w 9 qspshql)x;9a primary cvm2 h1q;sw)98qn6j pl.sq*phia9gx )aw9 s mdoil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil au pmom0 v ;(ol)iy(0wdnd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prol0(u(i)p;v o 0mmydwesent in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 n3.sqwq.0wly: v+ hi zxbjn :,turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the v .q:szi l b+hqnn,j.y :w3w0xsecondary?

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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 transformera19,cn9 gg 5 wfbojsfk/.btornih*, 9 has 100 turns and its secondary has 200 turns. If the input current at the primary is 100o5 awb9* chign,9f k/ objns.r9,tgf1 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 secondary has 200 turns. qmme or.w5cg8 r)6v tkxcs32ch0-fh. If the ieoch wh-. rv0mfkq3r2t gxmc) 58sc.6nput voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and i8 z5ty txx-dv-ts secondary has 200 turns. If the power input to the primary is 100 W, we can expect the powvx8y-xz t -d5ter 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 120 V. The voltage is usually step7vz g9o (ur1 boymrh42ped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 (omyh9 bo2v g4zrur71W. 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 gj/ ak. q2upg6usually stepped up to 2a.6pqku ggj /4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission 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 usually st5ll4khp(,fxujl;a)uewud*he 9*. vu d.7hgtepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the hdvfa9 (u.lhh 5uk ; p)l**uxdu,4l tew.jg7 epercentage 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 resistance of 0.60 W. A gei+/; jelpoj iw5jv23qnerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original e2vi+3j;5ejjl q wi o/pnergy 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 ((zvyf ewdwy/yqc*.) line 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 transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transfw yfdy(eq/*( v. y)cwzormer 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 atc l3q7/xb5wmm 1000 V. How much less power would be lost if the power were tranq3c m 7mwxbl/5smitted 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 44 thdlh bpg87o8o*c: /g0 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator o8:p*h gc7t/8hl do gboutput 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 curx)qc:vd84z ;kzy6rpa rent of 5.0 A. How much energy is stored in the coilz: ;kp6qdxcz a)8ryv4 's magnetic 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 a1c1trpvdr7,v+to ,f j7q id1l n 18-H inductor. What is this circuit's time coc171t,vrt7 ,ivdf r+pl1qjdo nstant?

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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 11 loz zbx,qq9l(xt88 c20 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.gnk h0qhp6cg.j vy6jl)*x;v AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V ACj k kl;rujb -.cer+pttx85t:t4y78uw outlet. What is the resistance of the lamp8tl:pk7bt 5yu tet;-+ rx8r c.ujkwj4 ?

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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. v+8keca g3ad5u up28d What is the peak current throue+c 8gdd2kaa pu85 v3ugh 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 tgo6bb q(u+z +ao a 120-V ac power supply. What is the power dissipated in theg abuzq+(+b 6o 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 red8e+h xk/n99lgs; bsnsistor 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 resistor8esd1t s1v6q;sd3v zlotz*+ b 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 resys:a,fp u8p m+istor 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 ofwk22wau2q4 s3rsp iv 6 a 1.0-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;u-.njv jzoh rk741c su6pt 8r 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 coil have 14.0 W of i;9/.ab vk pqgvd8m t5lnductive 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 at f;1-l jnm q)3rrdo(0 jbbwg0v1000 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 inductoz2w l/ v97oogor when 120 V AC at a frequency of 20 kHz is a/2z 9oow7log vpplied 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 thb/9)to, 3jlq48on ,kjxdzvx irough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of gtfp0ofa7ig y72o- (d 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 re+yequdqsk z9x2: -z9o actance 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 qhz,v;w/h:s7 6 .ikazwx b8l shave 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 reactance of a 01jlt5ko-t6quewb/-lzjms83v 3i 1xxsq1; wy.010-mF capacitor be 100 W-t38y ls3i6j l1-u5q 1;wjovqs txmb1x/ekzw?

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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 )saga2, e,itq-tx5go 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 serct6h,)z+cq ml )jjir5: f zck*zbqp/ 0ies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c+)t z qf:jmc5z,pljh 0k)czbci */6qrapacitive 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 Hzgk d2oeeqcl q f/1d huw/,(c51: (g8rpbkl;ln if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected inc,d5 hq w(1leb(/dnk:21kg e uro8f;qcll/p g 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 res bxpchr,8*z +vpkn/gum /-h:z istor, 20-mH coil, and 1.0-mF capacitor are connected in seriesxrc/:zmvb,-phkz *u pg/n h+ 8?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wpu6wg:xz 4i 7uhat is the impedance at 1000 4zi:x7uwu 6gp 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 con: t jx,hvv-s.)-nai lunected in series with a 20-mH inductor, what is the phase angle an ,i- )xu: vvjl-.shtat 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 serim-1hpsa: af;:0bq 0 xv i93/newwiyhjes circuit with a 20-mH coil and 1.0-mF capacitor for a total i :jh0w e3 y-x;m s:inw fp0bq/i91vaahmpedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resist4q93y )b/x/vjt*tra phig f7o or and 15-mH coil to get bj4q7t*/ yit /p3x)gvah ofr9a 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 foru*uqt p 1(x2ru a total impedance of 40000q *u2xutr up(1 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 ,nizjg auunqo4:/yf - ymeap x()9((ybe put in series with a 100-kW resistor at 1.0-MHz for a total im y9yyua ngiz4 xu,j(o(- (:fpa/q)nem 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 series with a 20-mF capacitor. What is the impedjs 2b7l(p0(yqbvo.bk ance at 1000 H2 bklj7(o(pb 0.qby vsz?

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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 im7cxr7qrh-0kle;o7yok 7q5 r n series with a 10-mF capacitor at 1.0 kHz for a total impedacerr-k o77xr7kl;m5q 7qhyo0 nce 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 ser . qtj26 0bdub4.o -b :eec f18guwnrieypu4:xies with a 10-mF capacitor at 1.0 kHz for a phase angle 2bu.r4dujci8etg1-en y:bfb .:x64p q0w euoof $40^{\circ}$?

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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 r;kw fa8uv1 7ciz)7 yysre+9n eesistor at 1.0 kHz for a total impedance o1e8 9u;s7 acvnwki fy7rz)+ eyf 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the 8lcsn;am:m( x phase angle?cnmm a: xl8;s(

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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 k8+ n8av i3hxxresistor, 20-mH coil, and 1.0-mF capacitor are connected in sn8 ax3hxv +8ikeries?

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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 ca2mwc s dx.bg*+cu((w pfrre g av:.5y,pacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circu (m w:gu.(p rvw2ys e5,gfxdbca *c+.rit?

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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 cg0fug. o,- woinyfy2 on,.,w 30 W, and an inductor of inductive reactance 30 W are connected ci,onwf-0,yw,g n.o.2 of guyin series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resist)+ y8efi;fd-v(1xru jax8bie or, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power-yf8fa+e)i;udj1xevrb i x (8 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 phase an df9mjvi(e 4:igle o im49j:iedfv (f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = r vyrr-).rvhhj/khme7f2 ; f7;evjt)20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order; he2 rv/yf7vk;-m rj))hejt h.7v frr 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 resistancelhqah/exy fsf7h5 u+ :)-y in0, 15.0 W inductul)q-n +x07yheyf5 haisfh: /ive reactance, and 10.0 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 annr f:257 zrztv AC 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 n o0uci2 2lj.bm9zj b:of 30 W. What is the powerjcu :bz i2.nljb290mo factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-b 2n4ol:oa fwhtlrw 9qh(/i.-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pob.o/ h24lo h ifq wt-w9nl:r(awer 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 coi56qw:au,r v kyt7dvji3 k (wj0l in series?kd q7ajj k,wwt vy 5(0r:v63iu

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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 serieso7kjkn kkf4l0/h :er51 9ukes with a 4.7-mF capacitor for a resonant frequency of 10 kl9ksok uken:1 k 7e/fh45r k0jHz?

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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 foaf/ 1 7bui4c/m dfqh+)9 kzgoor a resonant frequency of ha1/ +/ 4fg ofmbiq7oz cdk)9u1000 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 vj2u2g93ap0*wf0-p js ziko dplaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to bg09jp3o -difjaz0suv2 *2k pw e 1000 Hz?

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