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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 magnetu : qm1;qc2,e1ymllig ic 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 induc2n9b l 1r1pafation 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 loops of wire in a coil produces what kind of chang-gm m;1ajo j(ke on the inducg;kj aj1m-mo(ed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire prpg py:5a4yuq.6 gyj9eoduces what kind of change on the induced gqjeu 4ayppy6.y9: g5$emf$, 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 wviq4j(,nj3 khhat kind of change on the induced vi, j(3knhj4q$emf$, 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 jx,r0j tpem6-fui 2epra.2 3r field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of ankm pe62 8r/nbu induced current in a conductor will beu6bknp 82/rem 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 horizontal table. .2n ( c(js.z7r+9f 8osxiqowtvhgvn ( A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from a o(( n7+vtqnh(9.v.s w oz8x sjrgifc2bove)

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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 bar magnet is held above icwv. b-ltfuib,.d vk7o )g)9 rts center with its north pole pointing down, and released. As it approaches tr.,7 vcd)o t9u.ibg w)kbvf-lhe 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 tob8l6,8+s/k bipop zw 5qzur5l p in 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 thbzoqp65/8lp r,u 8wlz5sb + ike field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vectxh :laqx -y8iz05du 4jor points straight up. The magnetx :dax0 4-q8hl5y zijuic 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 regirycyqf ur hb:)j81:- ti 2kr)mon where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fiel)b)ctr81 u r:2yrqikf: m-yhjd 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 li wyb3(5 rdwnb.)ro0 szes on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of thezywws.b05o(r dr bn 3) 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 gv7 x2+wzld 5lwire with the north pole entering first. As the north pole enters the wire, lv2x+g75d zwl 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 speedqyets+ tdc04 oz 6ym6hr0m1b 2 about an axis whose directioyhzs1 c 60b etyor064qm2+dt mn can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of 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 spzr(7eg n y-uybhh k (i7 vw ,.z0mfin5/re,nb4eed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, i r5evw(fr7,bnkz.hu 0hygz(m -bn4/ine,y 7what 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.rv4ax 8+u5,p aeyhl;wp; o4mb
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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 thaw/k xm(w7wv4 )nt eiv+p*qr8j t 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 fieltg;a ) x0x3ygmon5qt6d. 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 iz2cwz8bpov *n-d574b2lmec nn the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning then4bpm87zob*e-vdcczl w 5 n22 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 v3 k0htkgv55ju. j mh/celocity $\omega$ 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 tr x t-ky)5t -a qbrpfv3ckj97q:ansforms

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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 revolutiq fg 5i(6 tzwks7b;z32uzwf2 cxq)e.tons each second. The frequency of the .2q bz 3(xcqk;i 5 gfs26)ttzwwuzfe7$emf$ 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 dcvv8g91cxab sk 8) 2uj8y5ny+ .injl vevice 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 tn9:a q64uy 8,xoplxiehat

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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 second:5svmi zv1l; i)kz2aes*r7 f9eltl1j ary coil contains more loops than the primary coil then it iskaeve9vi*jzr m 7ll;)f2z15: ti1l ss 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 n0jm2k04bakv more loops than the secondary coil then it is nk k0 vm4ajb02a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpu nyn6 bz/p/s;jy qza e42tk)s2t

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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 circuitrhkxz8f+o5n;w3t cm 4m p0+os,

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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 s9au k376m*:sexofgp vzdirq6nnx3*a14d /dw eries to an ideal battery of constant terminal voltage. q d1 6p3we*:v7gfu 9*nd/34 marioazsk6 dnxx At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of vb)s(xce4+wz7x.xu n constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor isu +bw) z 4e7cx.xxsvn(

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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 andc+)tv e;.j3 gm-)k 0d zn (bhrfvnw8ya 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 c9yymg q*wgi 89.e5a roonnected 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 *nv414zh)jen xt m:ee battery. The time constant for the circuit represents e1t m )en:n*v4h4 xzejthe 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 bakpcthm 43u;i6 ttery. The battery is suddenly removed from the circuit. The time constanip 6u tmk4hc;3t for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same uni(qr ,bqa4o4 :ju2f8sby 6 emoyts 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 connecte21 +cnfmp 6oayd to an AC power 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 cit pdyxx8x1; 8orcuit, the current1 xpy;do88xtx

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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 chan( sk euwr2afd2l v 6:sp5(qp4oges by what factor when the frequency is tripled?5pd6oe2ukpsrw(s qal 42 vf(:

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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, t t)fynk:u0o4 qhe inductive 4qtu0 fonk:y)reactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approached4) qt p/4jr o17puagps zero, the inductive reactance of p7pgq pa/)do1ru4j t4 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 cogkx3nz 0a dg+pcj h(m g+o+v0fw22lj5nnected to an AC power supply. In this circuit, the currentcng av jw+jml232 do+kp5hg(0 g +fzx0

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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 ksm -tl7/ ef6;:jr;n sy dmtknry 0:k)when the freques;kr: -6fn0)r7ym; ke mlkt st:yn/jdncy 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 app vu 6ol81otp yogvwt(r);5mu .roaches zero, the capacitive reactance of )u1rt 8lv tyv5 ;pomog6u.ow(that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the indmjom*hu-xah0 a 2 xn2rpd-, l6uctor and capacitor in a RLC - 6xammn -*0 druox2hl2,ajphseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is *l iw fv -5owi9yqv.xk9. l+pbdefined 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 impedan,5vl y- 0gg9cbrc+wwi)x0gwj *pd ti b1 -nbl7ce of the circuit increases if R increases. Whgpbw l*b7i)icbvd w0lj1gwyct-0, r5 9nx+-gen is 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. The impedance of the q57aoi(alm i+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 serienel v8n63dez/s circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doublebh*xk2,w ux;c in an LRC series circuit, the resonant frequency of *x2c bhk;xuw ,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 applieo8 ufmll. , g+uw.. n4jckoky:2kzk:zd 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 circui04 pudd4/ welet 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 is rotating in a uniform magnetinkrp 96+tpz0)zc z4yvc field of 0.20 T. Find the magnetic flux thr0kr4c69)z pzyp+v nzt ough 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 ra/gt3gpkx2udnjtan b hxf(c, 40d/p 7,dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetddhjx0 (nggpaf pnkx2tbt 7,c//4u3,ic 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 unqg,-g;c g,y* (jelzh -,cjgmyiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic f; hmycgg(jy, elgjq-gc*-,z,ield 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 sinl(w )qndo1n 9dr2ci9 .a ul2uxgle 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 chan t70i7w.l lvcpges 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 oe p;(6d 7qb*febblu w9f wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendic(7p b6f*b wq ;lbeeud9ular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15z jzz im97ee +2cb, c8h.wmwi( turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area e1:t;dw wd fdr+7a+qcn4fc+ r$0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locaddw 4u t;vf)l8tion where the downward component of the Earth's 4d8;lwdu) vt fmagnetic 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 long rotates at a constant ang1tfxa; l0cbmit; p2wsy:81ebs7 cof)ular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant m0x ce7st1 yi bc2pab:m)8;o;wl f ft1sagnetic 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-sectional area of 3 07 oa5(lmspsdt*nfd$0.25 \; m^{2}$. 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 ow34lrgj+mm4 lf 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 loops xj r2rt)1 -jjc of0fay:nl7 5non its armature. Each loop is 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, what will be the maximum output voltage of fnor72 f0ajny):1c xjtr5 l-j 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 consrv 4;8n9/dc6.,q /ffpegsq id8sl8p eqar5ni ists 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 a.rcog :dztk,ao)(2w xn output of 12 V maximum when rotated at 60 Hz. A magnetic field t:.k w ,czg)(orod2axof 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a ge (8szqfc;,jsl:u h4 generator 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 qic+cd w80g d ;mba+h:motor have 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 motor have am-hz- tq:l26g d(xlyf resistance of 6.00 W. The motor operates on 120 V AC, and when running atq m-d2z-fy(t:lg6 xhl 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 24-V power supply. Tqbvzkf-xit 4n5b7n 47he operating current is 1.0 A. Whax t74nfv 7-k5b4zi nbqt 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 resistt8 9i;pypzp s9ance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at f;9ppzs 9i 8yptull 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 Wa dc9nh413y fy is connected to a 24-V power supply. The operating current isanc394 yfdy1h 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 nezt1lcmd a9od)4s5 bd7gmq 70dzl2 v)ueded 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 primary of a transformer causesxog0 kkg;p -x,( +,jxa mlg-u(h/dpkt 14 A to flow in the secondary. How many turns are inh;ga --j pgxd g, kktp o((k/,x0xmul+ 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 qx,a5 ms,9vp iturns are necessary in a 110-V primary if the 24-V secondary has 1m9 ,a5v,x psiq00 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 a 2000-turn secog, hs8n0/s jd61 g-y0u lj hfy*;smnegndary coil. If the current in the secondary is 3.0 A, what is the current ileys *016;gghsu,nhg j-8mny/d0 jfsn 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% efficien1 mzp/xp9d jvwi)g d 4q*0p0ayjk o)k*cy, how many amps at 24 V can flow in the secoovwj41)/i )xpjg9d0p pkz*yaqkd0 m* ndary?

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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 trzp e ,vo-li*vv/r ;szbi648dm ansformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does theplrv/*i6m o,84vbze;s iz-dv 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 610x7e;zp p3wtya1llz 9p dv-c0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondaryd3l19zlap zy v;p-p7wx10cte?

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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 turns+iz c06(0 2wnustgdm g on its secondary coil. If 120 V at 2.0 A is applied to the primary, wt0gi g2+0w szu dn(c6mhat 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 t*m+dqsx x.ys8e- bsujh . p;d3urns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curren dxjq*. pxbsmh-8 ds+.es3y;ut 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. Ij7+jtr1xm q .xf the input voltage to the primary is 100 V, we .m jxrtxj71+qcan 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 secondary h6l :gq2;gnm3 pueou 7jas 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losse3 gg junq7u2lm p:o6;es)

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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. 0qqjv r65 lqros6 e:gc/h0)1 zywh .xd The voltage is usually stepped up to 4500 V by a transformer anc6q hoz60rdqv0q.5e wxy h:l j g/)r1sd transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped reip(wp6snwg se :*f0x;88nfup to 4500 V by a transformer and transmitted through a power line of total rens x0 p8w:*6; rsnipf(wfeg8esistance 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 stepd7er7 c+ wax4kped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost inckxd74e+w ra7 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 lone1a)0 cmx )vs.3fj. ruk 0snzsg 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 pejru0kv.0n am s3zse )s)f1 .xcrcentage 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. A generv4d8( 4s5evs pk7a1q iyd/jl mator 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 transforpjad vi5 me(1/svs84lqy47 dk mer 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 lg2dno 9 qh06iness power would be lost if the power were transmitted at 3000 V instead of aq6idn0n o9 2hgt 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 b y;ie3n (j8tx7kxh5g ae transmitted 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 7tx(3 n8j5ikahgx e;yin 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 ene1/1ist10 f8ix+ ig;ltp qhtsm rgy is stored in the coil's magnetti1h;l p08s/ittf+ img 1 1qxsic 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 re l-imrxm85ps 5sistor and an 18-H inductor. What is this circuitmip -mlr55xs 8's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage pb4q.azl o:7r76g zycin an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cur e5 s keq0ps3y5alle5wkhh,/2rent?

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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 resi m8jqs24wn fa)stance of the lamp?4 8)jnw2mfqas

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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 currae:wft* zj :)lpv0p ;cent through tzla*pt fp vj ;)ec0::whe 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 they35 zn: m*zbwmj/k5my power dissipa55*n:zbymj/3kzm wy mted 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 r4 q2 fdan pj1gu1md/4hesistor 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 resistor gtbu ue)pm 41/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 resisto6t54k cklt- *n*mblr ir 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 inductor at fm2.fvy;.ze ;4e5a n)x bzsta60 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 reactancehw5w3j1n g gu wo8r-qil 1t7y0q;1zl a 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-mHn53by hat*k-jvor z 4oet *fg 51n:n7q coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance 5;n kd al.zy3vvo;+y 72vfqctat 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequex4y/ qgjk8 i/cypdtr6m 2ja0(d3,bjf: h*nx oncy of 20 kHz isxd ( / r ck2* biy4:qyofjmpha dj/06x,3njgt8 applied 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 to a 11mdlle8 sou8umjj,rlx1 * h2,6z m, dq-0-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at3x,a;qa4 ebgdfn9y4 j (a6cgl 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 capaciqu/9y(vyla) xxobhl *w2y3tl 3.p lc (tive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 12e7jnl;f7 vg/z 00 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 capaml p/ht-jn:(uo ,kad 2w/:uy cynek6)citive reactance of a 0.010-mF capacitor be 100 W? 6n c)u2kytmhkew-:d,l n/o ua(y:pj/

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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 thrud8a, -tw3b2/yns9 pb68bkdzwm xn+n ough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0e 1r.km.vux0x 8;qclb*qhez, W resistance, 15.0 W inductive reactance, and 10.0 W ca8qz.1uh0* k r,em bc;.lvxqexpacitive 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 impe /r,tyvrfx75 ldance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-l /,yv57r xrftmF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistojju+prdk /g970m5lzi r, 20-mH coil, and 1.0-mF capac j 9p/lrm+i57 ku0jzgditor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mHp6u t (dcepxr9 m1fj63 inductor, what is the impedance at 1000 6(u ed f3j1tr xpcm6p9Hz?

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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 i-0n sv+3y4gi;ipcjk p s connected in series with a 20-mH inductor, what is the phase angl+kppcv yg 0jin;4is-3e 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 withlte1ikgm nco r :cu;*f2 uj-/rhk c0(3 a 20-mH coil and 1.0-mF capacitor for a total impedance of re;:(r lk0-*g 2 t/ c3knhccf1muijuo 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 resisxk /qs/2fw nc+tor and 15-mH coil to gek x sncqf//w2+t 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 50u*i 8d.bqgy7sifod5 300 Hz for a total impedance of 45o syiu*g id37qb .8df0000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a9 wq,v,dox 4hy totay9 qh,,w vdox4l impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connkt;t/)jukc , ay52ui bected in series with a 20-mF capacitor. What is the impedance at ib5;c)au2/tkktj u ,y 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a aaob6bu+l5 u u-c+,r ctotal impedance of 46+abuaoblcc5-ur +u,5 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*asjp p0gn/y; exx,-lie;sa) capacitor at 1.0 kHz for a phase anglj sysx; /e,*i;0eaxa)p -nglpe of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a totaa 9xx+foc fm:u2262 frzhs( kwl impedancefazo+:62rfcku f (9hm 22wx xs of 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 s:aax1b jq;u:ggdg 2(y 0:pti beries with a 100-mF capacitor at 120 Hz. What is the phaud jptxiq:(:gybbga;0: ag1 2se 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 aty 2h. 6 (n*0lwy7mkomv.tusi b 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar6ilmo(nmh0 t7y *uv. w2.yb kse 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 1;lv1c u;o tyfreg8e /:0.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hye l1:g;u8ocr/t ve;f z power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capaci7ce*d1 ouvj-ms g- h6stive reactance 30 W, and an inductor of inductive reactance 30 W are connected in serieug*d6 vs7m-h1 e cojs-s 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 circuisq3jy/( m wpl 4pal52lt containing a 50-W resistor, a 10-ml4a3/myl(qjp5 2 wpl sF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a2/wa lt;yg frt t/0*cy phase angle of y 0/ ttcg2wraytlf; */$40^{\circ}$ 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.* oywd*ogg , ;zq7pqu-0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be drivo*w g7u;zop,g*yq- dqen 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 circua up f6ao-hh 1.m:b tq1acce4;it with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to ab;a a6fuq1m1e-a4 hchot. p:c 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 circuery7:s4 dyco1er3oj4a.pjeac.+n; kit 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 vmokk(a:aa / h488 l2chvfp5c W. What is the power5(hv:2 ko/c ma h apvk8fac84l 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 contt u g5wbg+t4l6aining a 50-W resistor, a 10-mF ca5wgu g64t+blt pacitor, 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*3)d pj7uwo7hg i7r hc capacitor and a 15-mH coil in series?h7i hp c3dj7ro7*u)wg

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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 +ph1sz0 ww tg:qfz r(+lw3mknh5d. 7yin series with a 4.7-mF capacitor for a resonant frequenc.qz:ly 75twhkn +f ( pd3mw0 wg1hrs+zy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor ftuh30*ar v4bfor a resonant frequefbv03ur th4 a*ncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor xs ( ,xhr);xqdand a 40-mH coil ixh)dx, xsr(;qf the resonant frequency of the circuit is to be 1000 Hz?

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