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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flm;lom 2 ws;hf7 4cajn;ux 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 z al,rv++v.f dik (j9rstates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coixvf3 rs:,lh5y2lkp 9j-yz i;46-fmv pljkt3k l produces what kind of change on the indupp-;h:v3 k4,jiklvt3mjk 6rly 259s-f f zxylced $emf$, 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 mzz2ef :i*b luq)2.woragnetic field through a loop of wire produces what kind of change on theurz*e .z2bo:iq 2wlf) 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 i(j*nw-c rnxizq 8:l6the induxnjrq i*nz : l(6wci-8ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fielwysj ta7+9e c*t9gp; bd 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 i* qnm(;lkg*v, the direction of an induced current in a conductor will bimv gn*q(k l;*e that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontalkwsl 1g zwt(t00f k-8g table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (fgtszkl0t w -wk 81(0gwhen 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 ta- 4y+w+pxqm2l wrbi,s ble. A bar magnet is held above its center with its north pole pointing down, anm,qp w2+lr4bysx w +-id released. As it 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 thnwt)cx) hb30wpnjo +-e magnetic field vector points straight up. The magnetic fiel)jh0wno)b- c3xp wtn+d 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 region where the magnetuxu0n (c8ttb*c r 3)qqjc()tiic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from cu(xc0ti3rntq (j8c*)b )qt u 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 tsmf -8h. bsfh9able top in a region where the magnetic field points straight down. The9ffm -h .b8hss 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 horiv qt09/:rv bdjzontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from v9jq/rbvtd:0 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 througz*m a ze*,w452rdbc lmh a loop of wire with the north pole entering first. As the north zm zlwdem*b*a24, 5 rcpole 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 rf*zeru,z,p+o . xybn;otated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis u,o r+zxn. f ,pybe*z;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 a/gc ko2w2k vbrx(cf+ lkidv3d.9:m -mbout an axis whose direction can be varied. In a region where a uniforkd (9/vxb+2.k23:dolwc i vrmg fmkc-m 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.r:;y qjpljapjq y 60w1x3t+3t
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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 thatz +gfj+0( h8qtifdz i* 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 7m; .qtgbz ax+$emf$ 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 (oriedb f/vk zky7;p2 2u;yl:y )nem:x 2tgcnted in the east-west direction) is moved northward at constant velocity througheyd:kk)c 7yl/v;2 gxbp;mtnf uz:2 y 2 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 constant angular vel-84l sfg)pkdn :bq. ezocity $\omega$ 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 transfut s-a7l2yh1 aorms

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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 revolutiosl lak2r i( mn8nyenb:9,d 43uvuy+a9ns each second. The frequency of the vr2niuy myn9k9d+ :8( lb4 ul3nes,aa $emf$ 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 debr )i(2d/v1 tznx (kbbf-j jq- y1mo.cvice 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 device )a7 /6oxnqcq-nr ggm)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 prg4 m93l4uu8 swe6s3zc(i qwvsimary coil ts4clmv3qwi6 (sgus9 w34u8 ezhen 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 than the secondeszm4 :r u/1bzni. e0dary coil then it i dmu4ern1z:z ei0s.b/s 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 poqta wp89n c1q( mip4,xwer 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 circube0kfg3*d/ uk it,

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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 conievdh q t+*z9lehu4-tm (g2n3 stant terminal voltage. At the moment cont4i9ql+t2ug zem-3h vh d t(ne*act is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are c(d ku79m,opz3 pw n t3bl+sd;uonnected in series to an ideal battery of constant termp+dl k3tu (nd9oz7u spw3,mb;inal voltage. At 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 i l.biy(.y;*7 w18 jul,szoij c ncgyn3s 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 iekul3d217b+w e2hy d inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batcdi 4 uhm,27nttery. The time constant for the circuit represents it2, nh47umdc 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 0c 0uk 4ncm3jkin series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decreasen kjc 0km0u4c3 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 un t.pttywm 2a/,5 m46jcm irfn*its 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, them:eu h qqbzinxu z0s*:o,*2n. 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 0; n-,wq a n4mb,w(gkq2aop uscircuit, the curreno wkng-,,4 bqan2p(a 0 w;qsumt

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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 w t ryskhu19r+ztdrr*l:a)*5) na o:jihen the frequency is triplz ol*)1)sa5rtraj+ir9 u:nt kr* dh:yed?

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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, thh)/ fbxro5tv 5cfm7+clp e:s0e inductive reactance of that isc)expcl: 0rh5vf+b/fm7 o 5tnductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across c y9v- ek)v qv687oo1vpwgrs; an inductor approaches zero, the inductive reactance of vo9op-716g vc krwyv)8;v qesthat 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 cwc4w1 bwn 9:vyyc/1j sircuit, the curren 91w4snw 1c/yjc:vwbyt

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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 circug f4p +dsp/q;cit changes by what factor when the frequencyq 4ppf;scd /+g 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 approaches zero, t3n,cn87n lo)c-( 2bwhaxqpn30gmke m he capacitive re(mo7c0p 2hb8n-qc 3lwgm )n nak3xn ,eactance 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 angtmvpyq85nq.25 p 0 l8eq x0qu:gibv6mle between the voltages of the inductor and capacitor in a RLC series circuit .pvye pb5mnq2q86x5qug v: m l8it0q0?

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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 cy aoq0x 2lpx)(ircuit 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 th00kd2 ygb v1obe circuit increases if R increases. When is this 0ovb1db0 kgy2 statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit inx kvon)m*-3/ yxi2plxcreases 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 increases if d:slw*hjm,nqcqyxovj9822/txx+7w v vz ; s2$X_C$ 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 andg:soqr1 c 8vg+ the capacitance both double in an LRC series circuit, the resonant frequency of that circuit wil1 ovg 8+cqg:srl

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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 byflz(r2i; ktwp32 i le- +hl xvjb+(3euh .6oip 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 oc4v ) gts* wt*hjc/fy)wcurs 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 radu0a9u+1t c ik:ob)y xyius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Fu xytocy1ubak)i 0:9+ind the 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 isc+lgj 2 ;loakc6r sv1+bu db*di 16pf/ 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 perpe1ba1 jl+ c6 oikdv lgf6s+ru c2db/p*;ndicular.

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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 +6dkykmj uy58.10 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 vy5uk+mj6d 8y kector 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 ofdei38 pk.9ygq,o1qlis* kpxlm czl2, to 7s (9 an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changeox406t cuxm2z s 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 wire on a square f/m)1 s 9gayvnxrame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unif1m/v sa 9x)gnyormly 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 adl5(zy)o* lmc*i ia (pn 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 areaz,t w c3h(nbg(iy(oux 00 cl6p $0.20 \; m^{2}$ 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 flievi 5ta+sw18sq s horizontally at a location where the downward component of the Earth's magnetic fiel as+st5 qiw81vd 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.r7a2x( 2e+urwfyz l2l 0 m long rotates at a constant angular velocity of 2.0 raluer (+x7f 2rzyaw 2l2d/s about a vertical 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 cross-sectionji3l.uz w ow 1n46uxf9al 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 m)uj, nid wr-(xqf,7dt i;n)wug 4g1i 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 $emf$.

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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 y0 ,z;r+iuhnf-xm :8esq2d etloops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to tu m8eyeirh,q x2d :tns;zf0+-he long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arlll behrf62 9ymo)(66hwqvn/ ea $0.090 \; m^{2}$ 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 aogq)kt)(t5zconstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T ista 5 zg(o)q)tk 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 generv vx98fotj3lt/*dw1g ator 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 o 3kz.,i2uv3o bqh nis9perates 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 mot0h y58nb w0z qo:qu6fhz5mbvbm:0u 2w or have a resistance of 6.00 W. The motor operates on 120 V AC, and when runnqh y0w8v5 bw u0m:uz0: 2q5omf bbzhn6ing 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 au /m5igk8ckmg,.nr +vhuc6k / 24-V power supply. The operating current is 1.0 A.mcrg8,/. mk+knugi u56vk ch/ What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is c98jfcnq t,* sv7 nrnz 4vs41 yxokv5.jonnected to a 24-V power supply. The operating current is 1.0 A at *syrts81k 4nv74 ovqnxv 5jn.j9 ,zcffull 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 conner3x4 -f qvap6gz)9n vh4 yszd3cuc:x+e 1jwj1cted to a 24-V power supply. The operating current 1pj cuy9f1vjz - an6:ew 3+g sd)rxqxhv4zc34 is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to r4fjd1/ xh x-1 c3g qghz3i9csmeduce 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 primargb b6mkl8 z-0xy of a transformer causes 14 A to flow in the secondary. How many turns are in txkb680b- z lmghe 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 neces8hqa8t.ub0v hk(tsy-vw ,t6cqq; wq-sary in a 110-V primary if the 24-V secondat,k u8q h(qc8q-;y s w0hb6q- tav.vtwry has 100 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 cxz4pyh.grp 13j t*k4v, js(f coil and a 2000-turn secondary coil. If the current in txj 3kt vp4hr* (z1.ypfs,cgj4he 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 tw m:rn2emd 8/c4j -yc4f5fdsr he primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary? fm/c: c4y n -54jmdf8wderrs2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The 4h tva wbj/j3:primary coil operab4j:/3vw ajht tes 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 its8.dkba)zea 1y primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage .1k8a bda yz)eis 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 tmqgr2d3s pzdwe*uz1ii p3,b8x,-1 d b iv66szurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thi61igru3 dd p3z,- 2sb*mb pi1dv q zsw8z6,exe 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 an/h+8 1om40 n*mqn7q7/vzq gizl gpstfd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the+14 s7lq7*ntmggzh8 v f0z/qmo nqi/p 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. y/x h9l4g s-2bkow9b ocayf./ If the input voltage to the primary is 100 V, we can expect the output voltage of the secondaryf9cs/lw- g a.bhxky/92oo b4y 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 200 turns. x4w4w pl*ce, nIf the power input to the primary is w l,w4*x pnec4100 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 producesrhr1xa+ jwv 2g22b; rw 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tw wr2g rxa;122 r+hjbvransmitted 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 currec akvdstk75vi 5xp2z.) 3:ucant at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line oa)i3d27txz cpc va5k:.uv ks 5f 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 12h87ltnzwpg *8 0 V. The voltage is usually stepped up to 4500 V zh w8pgt8*ln7by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmissionojwt0(br .m-9y -xx ov3gqkt 7)x:xs0hmxik; 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 vok7ko r sth-xb9mx3v :ygo-;w(jmq .xtx0i 0)xltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance o*dw75+kfrr ktf 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 trat+dkr7k5fr*w nsformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power woq8u-dkakut d1 ;-ve c8uld be lost if the power were transmitt-dk-e v8qu1kt; uadc8ed 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 2l(v8. r7 r0j9t1nxgwpp ,mffz0 A. It is to be transmitted on a line with res.t(jm8fv90rwxpg zr1 n ,flp7istance 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% 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 fw b i-r/7p7luin the coil's m 7ufp 7ribw/l-agnetic 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.fo 4rs q8d7mm.0-W resistor and an 18-H inductor. What is this circuit's time consr dmq.o sm47f8tant?

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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 v,d.hj b.ct2x .l0zirin 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 theka lk8v/y7sn- csv(3r 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 resistaokqx (,fsccfj2c8i5 +nce of the lampf8s 25xjqf(cc ,oik+c?

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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 aced+e- +i,y bfs8s/qkd power supply. What is the peak current thrdyd,sfk8 + eibsq-/+eough 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 supp/kudsjy,)kg3l i2 9ss ly. What is the power dissipated in the re,ssiyksj2l)9 d3kg u/ sistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a4ntdgl0rd2 e + 50-W resistor 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 resisto)as b xlg/p*4lciv k-*r 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 resistor g;3x mux7k1;hm s xf mv/yga )8*1rftbis $I = 0.80 \sin (240 t)$. 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.mgw g2+sjg0+(tdh o2q0-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 reackdf;,l1 s f0knity13stance of 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 in/cc5:,)spx 8 fdxiser y88vcbductive 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 ina.exwa4wjkp 2f.0 0pzductive 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 5lk3h 6fdz x j8zmv.2fAC at a frequency of 20 kHz is appf lm53 hzzkvf6j x.8d2lied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due t:mpm bk8rct71 o 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 vpg3dfo jk6wal+ *n3,,d*fj xa 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 neededx,l-g te--ww otkp ,-i to have 50 W 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 do*bkw ig,oj- zcwq0he ,/z+8 pves a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the n.y1fqn t4bt6 capacitive reactance of a 0.010-mF capacitor be 100 W?tnt 6y.qfn 14b

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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 an+ 8p ou1v ;9h qhpz7,p7kojuzyd 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0ak x st/ ;tvtsq.0,/ni +vvu2u; lbv1c W inducsasx2c u0/ lk/tn,t;vbqv .v+v1 ;t iutive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W res46x8ai*ln ) .rhjit ggistor, 20-mH coil, and 1.0-mF capacitor are connected in sergghn* )i.l j486i xtraies?

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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 resistor, 20-mH coil, x, 1 3wd7wdxe 9fxly3*k,c juzand 1.0-mF capacitor are connected in seriesf dzxj1u*33wy k,xc9xl, e7wd?

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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 w4weydpg :w l/bn9d.u/ith a 20-mH inductor, what is the impedance at 10u/n.dpb4w:e l g /wy9d00 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 witw:k1pcv/f(uysq g olv, f8;y5b(e)o ah a 20-mH inductor, what is the phase anggyv( ; b(eoa /scw,o vfk u15lqpyf8):le at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a gt4(+/ bugv*uuycjc,z3 hy 3/zipeg)20-mH coil and 1.0-mF capacitor for a total/ 3yz( vu+,gu* chg)byut 4c z3eijgp/ impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resid9 0 h3vt:l fz1mdjhzf4e.c:hstor and 15-mH coil to g4jh .vf zh3dct9f:0l1m:dez het 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 bp 7nd dmvj y,u(0dq5r+e put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W0( mdn,r7j5q+d vu ypd?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 7yn3ceg -o7c x1.0-MHz for a total impedance of 1y37 x7cg n-oec50 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 seriexzv2 lbmvadkf : 7k9l3;q5 zc13z4ehos with a 20-mF capacitor. What is the impedance at 1000 H;l3kqv 23a9z hc xkb4lzdm51 7:zfvo ez?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-u 1cja ;kzd1i tk:;lz,mF capacitor at 1.0 kHz for a total 1 1,dzltkjau;;:i c zkimpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitt+. s (;in oi,*y*jbh crqd-ss2 9dafwor at 1.0 kHz for a phase angle of 2j*abc tn, ;oywh d.i(rss9f-d*sq+ i$40^{\circ}$?

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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 re3.4r2uaqd n4qp;yle lsistor at 1.0 kHz for a total impedance oa4 nyeq 3dl;rl.u 42qpf 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 iz(sm, gzc ;i2l)pap2 ns the phasez;m)ci2(zngps2 pa, l angle?

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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-/b3qxyi :x+tl:m +rtogke q2 a 100-W resistor, 20-mH coil, and 1.0-mF capab+3g k2mtlye/x qo:qitx- +: rcitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF cay7t) yfp.*e88om.yjm q-l wxipacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What istyq )fyxpi-e* wy7m m8lj8..o 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 30z mk 78016(s8+;ksbmlnqrskjaj mau0 W, and an inductor of inductive reactance 30 W ar 1mmusk0l;rb68na0jk(mj+s7 k 8s aqze connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W r emar/9+*nrx(s jp 9jyy 9dtv*esistor, a 10-mF capaci pyj/j(rmras+vx 9*d9 ye *t9ntor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-,g2/eat mnwjeu++mn9x/a:cbz, sb1 hW resistor for a phase angle ofhm1ct ,uamb:wa+s +/ 2x genze,nb9/j $40^{\circ}$ 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 = 2uo uyn c5b f:8ebu;v9.00-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourvcu9.o5nb ;efuu : 8ybce?

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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 2t j 7 pap)v uikry,q+ux09d7t: fa/wuin an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive ruq7:u2yp)+d ixjar ukvpf9atw7t 0/, eactance, 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 ACouyg/q5k 50s67 2 7wq9lndvvdyaj(gh 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 ae7lvx lkm5.q+ nd a resistance of 30 W. What is the plx+qm vk7e5l. ower 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 factl5 +ti xl/j-yzor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6lt 5zxil/- +jy0-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 se9.z iwes0. ze03dwfrp 7i3nyeries?ei793ep wrnsf0 z.dy0ez iw3.

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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 lt0wkici1o89 yp)*h yin series with a 4.7-mF capacitor for a resonant frequency of 101w 9yc0tp* oykhl) 8ii kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a+- w:0vxbto. f0 vj5ohzrua: q 3.7-mH inductor for a resonant frequency of 1000 H:tvo0b a5f huq0vx-wr.z+oj: z?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resb nera1umutqv14.(ok ;g)nn3istor and a 40-mH coil if the resonant frequency of the circuit is to n v).; mnuk u(1og3q 1re4bntabe 1000 Hz?

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