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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 ar *ipb cxs(r(h):cv0mke units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inductl(pfuw 4vekzb:+.r. tion 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 zl yt((uztu0w4k5l7t of loops of wire in a coil produces what kind of change on the 4(klutwuy07l 5zzt( tinduced $emf$, 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 of1a gcn-nb2p d6 the magnetic field through a loop of wire produces what kind of chang2g-n61cp a bdne on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change ol ww ih713vo(ak1*g ran the indu3( w*ia gvr7w1a1hk olced $emf$, 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 field a2id(t vuq06n gbumx :,:k7qlj,inq0sn $emf$ 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 o hkkpdfzv e o5u82v.1*f an induced current in a conductor will be that which tends to produce* pkv zofkv8215euhd . which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar man, b)o40zp pgngnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewedgnz4 bo0, ppn) 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 tab/9mc0 cedmwf2lkj8 b1le. A bar magnet is held above its center with its north pole pointing down, and rejeb1lk8dcw9 cmm/0f2 leased. 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*v2f5 at;qy d7a0oi fu the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the fyuda7o t5qf2v 0*a ;iinduced 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 magnetic field v:s8s4j) 5t/zswvyc dd /eat1dector points straight up. The magnetic field suddenly grows stronger. When viewed sc/1tz e dtaysddw48 /:s)jv5 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 whep,5qc pup lnwec *mcg0z1 b638)hzt7 are 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 ta ne0gp1cpzwcm8)6zp5 hcq 3,*7l bu 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 horizp0gp2v*x(6 k oz7 qoj g:ko;ao cm+-zlontal 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 view72 ;k(-a xjgompgol* qocz+vz:p 0 6oked from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nortj13) rjben zpi-b2jr*h pole entering first. As jjb*-)2zb 1rpj ri3 enthe north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wh)6w 5 9oz9l1 gsqp+3p8sh9zfk qxx+cl5kpq o iose direction canozp +9xxs c5p8ip)ofk 3 9 5z61ksqqq9g+lhl w 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 speeonq :vb+sf p*7d about an axis whose direction can be varied. In a region * b7p:fo+n sqvwhere 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.m64y)hm neq3fdk5 xp .;f7wfces+)1kmodp* x
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that ann spc ojd35fkw* v/;8qex(dbyp48n u6 $emf$ 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 magnepmp zfl*.;s 9q,s zov5tic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-wev kt8*ohm)wnk js-m ,/st direction) is moved northward at constant velocity through a magnetic field that points straight down) jt *hok/vn, -w8mmks. 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 rotates5hisla spd0+/7uhov 4 at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformsuk6fcqlzso40w: )hb8;apsov a0y ;p,5 u5 r sj

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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 througl9tk ceso5 1whzc.es, t5j j;-h 60 revolutions each second. The frequency of the ; jc-1sektjs 5the l.z,5o9wc$emf$ 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 deviced z9mw/:n f m4s1a)iwm 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 desv79uo l2x0ezvice 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 thtv*)*viatjpy 6u,6x y slr9(ye secondary coil contains more loops than the primary coil ttjl, a y6xrut69y*pvs vi*)( yhen 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 co:w9 plnaw q*m0n wuf.)ntains more loops than the secondary coil t 0*).:q mnpw9 walwufnhen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power i/(e xd,eq 9rhhnput

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit,ef0k9lc56n+fl ie-b s c; qrb+yy6v;q

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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 consoy lh;0x3 hfbwnth1 * v9xwaz9izw0*5l2 ge a(tant terminal voltage. At the moment contact is made with the battery, the vo3w1bhzeyl2ft0*x 9g vahh(x aoz *w 0wi9;ln5ltage 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 e5ed. , 6hw,x3cf*p5jrxe bu5vfbk26q8nlqdof constant terminal voltage. A6 eve bl.wxfjx,uf6,dnr28q5pbq35*5kc d he t 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 wii ce8v7t()jy; q rp1kxth 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 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 inn u-i0p vtx-do-m:b+qductance 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 conq+ wooq jyzr,-4t6bt ,5qm 2axnected in series to a battery. The time constant for the cirmja5, o+z6q2 btrw xtoqy-,4q cuit 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 battercsd z2 3llz5/cta+a9hy. The battery is suddenldcs z5cl92laz th/3a+y removed from the circuit. The time constant 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 units exce: pg*k 4/yn :j02c2isziuat z.vu8c iipt:

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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 mx hqh. d(ds0 ho2l+o3AC 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 th)-z y+:zi1pcknyg7w mis circuit, the currenty+kmn1 :yg c-piz7w z)

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance 9 - xu+gjtn05(h uyogr0d4oavin an ac circuit changes by what factor when the frequen90 nohux04g (vg+a duytoj5-rcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, tjo 4wnl 8h2,ltr0ncd 5he inductive reactancd 5 tn4hl0wjrl,2oc n8e 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 approaches zero, the 4gl;l hgvj5t0 inductive reactance gvgt5jh4l 0; lof 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 t fqk*8ft/- febb2)g0a iw6rxn:0nuuoo an AC power supply. In this circuit, the currenfnfr) ebf8b0*u no x- w/2uq 0:ka6gtit

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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 faclgg;z g * :gdxu0/cea1ru; lk0gy8kb0tor when the frequency is tripled?/0;gdg:*gxglkze8yur; k00g c1 uabl

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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 acrosmk0(g9lfd:sok -9c7sk +qzh k 3yqd*bs a capacitor approaches zero, the capacitive reactance of that capacito:k b 0kds7s*3okqzk9mhdf9+(c ylgq - r

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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 volgyu9pey)lkv:o uv32 l/ :g1e utages of the inductor and capacitor in a RLC series ce2 uokyg9)vl 1pyvu3:: uelg /ircuit?

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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 acyh/4p irj l2-scd j-,n RLC 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 imp f62. fouknc7bedance of the circuit increases if R increases.cfunkb.o7 f26 When 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 circuit increases ibgrqx,1x z 74;q.ul hef $X_L$ 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 incd4bzr 1zg-r r6reases 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 an LRC series circ qxq 3nb72ml*vuit, the resonant freque7nvbq xml2 3*qncy 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 applivj3qteayv4x rqbu669 9) sbt: mz -)xded 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 ci p*pgdrc 51,pzrcuit 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 unspc ivbc8t8o9e pzx o41p;ad*-d8 r2ziform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectooddsr txcba8 2 zi-z*984p pe8cpo1;vr 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 field of 0.2- jgw71 nthi0n0 T. Find the magnetic flux through the loop when the plane of the l7 it-jw0ngnh1oop 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 radiusju(p 1pa 6.lhymb o6+ rp9 p-)7pixwno 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the pm (+6ipwxbpojpo .-ahlp7p u1) n6ry9lane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional ar immp :qi(m0d5ea of 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 change.6 jkd/8t+ps: a9sekshr (g8 le4qeiqs 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 2sz.g-pny/ije2 v. .tb00 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of tg/2yte pi .vjs..b n-zhe 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 tyyw ye kbov*/p-9a +b(urns 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 a56ebm z 3*:pk* myvn/ *xsmrkfnd 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 60 m flie .p,erxs6v, ses horizontally at a location where the downward vrxp,, s.s6ee component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal ba3cc :bfiv73mni+ ih8+ od,et xr that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a const8i fd:oebv+73hn+c m3ixc, itant 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-sectional area r5:aplp g. 0pyik9+3kiig7p iof $0.25 \; m^{2}$. 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 of0stl w ,7uply/ 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 on its arm)gdg 9lr: 2qhbpp 4ju7ature. 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 rotatior p24gbh p7qd)9 ujgl:n, 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 dxm 3 x7aj7d8k100 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 wit;swi l:n) ud3il.ye p-h an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is ali- u3w y:el)nps;di.vailable. 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 generator with a maximum zkh5crw . 30dttwdhys1 7uc14o6dyt9 $emf$ 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 resistanceh0 agmrw;6lj gc- 1e u6mi::ce 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 a resistance of 6.00 W. -lp2s4 m;sq982bllq/x2cidbug p)t pThe motor operates on 120 V AC, and when running atl x-l)2p2 pbq;s msg28lp ud9 /iqb4ct 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 8nrz4gx1wg1t to a 24-V power supply. The operatx ngt4 rgz81w1ing current is 1.0 A. 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 connected to a 24-V power supplym,4ynkp*ed;d wnp/ ys+yb:c/ . The operating current i:k;ycnw /+ nsb,d* m4/p dypyes 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplb kp8b.qe gne 8nr1:/my. The operating curree n:mbk1eq8bn/g8 p .rnt 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 nkg m5sdfxbi-.7li6 bqws1l90 eeded 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 causes 14 Ayx v v/1/r)oay to flow in the secondary. Howyv ox) 1/rv/ay many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V prima5 3;mcqrs9ea2h p g qmxf41z*ary if the 24-V secondary a425xfgshcq 3 *erm1;m z apq9has 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-tunr+5mp+i xfnl73dg0 ea4 om,orn primary coil and a 2000-turn secondary coil. If the current in the secondary i mf0rag+oo5ln4 x i7md,pn3 e+s 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 transformer8jmeg9e ;d o ei* akd128ht)wi. Assuming 100% efficiency, how many amps at 24 V can flow9ejtok1da8d*g;eh )wi mi2e8 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 a0.xyaw vd(y 9nt 10.0 mA. The primary coil operates on 120y.nx(0v yd wa9 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 ite80bsev9gu5j s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 bse8e g5uj09vA is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil a)w7 doh)l ozbl.8g, gund 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is preo gzul g ))w8b.lh,7dosent in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sea9y+ ,h hhgels*f1z(dbcr 7.fcondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secob( dya71hze s +,hfh9lf. rcg*ndary 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 10 z*8w qu,8cj+ilnes1f0 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect thsq*u w cfljezn88i+1,e 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 thyk tgk/2 nv +wd0d*+avi g*sk6b0 1gburns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fry0ab*/n+h i2+*gvktgd gw6 1dvb ksk 0ictional 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 vooqmsghuzt79)sd:.wf e-;ca 0vr 0twb ae :7a /ltage is usually stepped up to 450wq 7g-cmes; uzsb)v0hdat: w tf9:aora.7/e00 V by a transformer and 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 al5 *0ecw hj3dstepped up to 4500 V by a transformer and transmitted through a power line of tot3wcelh*0j da5al 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.+6ykxsyoc 2dr l m7r-9 The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find y 7x9l+ s6m-doyk2rr cthe percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance oqdd sm ;7yzt3 +8lk6mqf 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 tradyt 6k+8s;zmm3q dlq 7nsformer 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 *d:m ;tgq n8gmn6mv4m50 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 m 64:t;vmmn m*qgnd8g 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 lin1* 57bztora haksz48;dq hv.l e at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at.oah adv8 *bh 7srq ztk45lz;1 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tranh1v ecn ed. r:56.dosismitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if troced.is5nd hv 1.6 :ehe 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 inh(wfb /pbvt w)n uypl.y *n2, tqo*4/w the coil's magneti fn)v hb,t4w*/*wn/uqy.2wbypl( tpoc 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 r.xayq p.r0gg(r2ew z1 esistor and an 18-H inductor. What is this circuit'xz1..e qw2 rypg0 gr(as 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 in an AC c,4qgzb 0c cfd3ircuit 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-qi0r(w s0gcpp0 d 8v1eV 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 A rwxcm/w93r01gc jz9uC outlet. What is the resistance of the lamp?jwxcw3 mrc99uz 1/ 0gr

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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 connect75txojni;s *bk1uh w6 ed to a 120-V ac power supply. What is the peak current through the6sx*hnj5;w ktb7io1u 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 tofdv wd/ /opj;5 a 120-V ac power supply. What is the power dissipated v/f 5wj;dpo/din 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 5+ ra 7/p /4ppx2xu,ptw.qpndn0-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 resistmj cun; g,z;8(q. ikzvor 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 resistc99qmbav*/jta r8n-f j7 wam 3or 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 at25,oh :c+rkh:lcc ybj 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coi 1njy rtq:+/eqfs nv44*8ye fol 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 coiiebr+:r m8z /l)lwua hryzv2bf +0/r.l 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 at 1000 Hz?pf;fx6 cbwyp ;5 8hh+r

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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 7 ws(n5b,bx nvf a1r*pe4k (-7 joouwsa frequency of 20 kHz is applied to it?71(,sav 7pn4wbro xe -sbfoj*wn5(k u

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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 thro7 ;:(o4zd mqrtegll- ough 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 capacitivs2fa,m wey lih8+yb34ow21,q ysfx- re reactance of 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 neededyieli ,g*a ws+9ik, +w 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 does a 10-mF capacitor have a react* ;xtgy tj6lzc49tox6ance 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 r4ihh01.*1k s*hwnqg6iipkz+lkz h( reactance of a 0.010-mF capacitor be 100 Wznr+qk0lp k*iihz kh .6h1hgs* i(1w4 ?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?7zp0 bp pmt1z6

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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 14zt9rbdsrphh(yw j e0/mb )2(2.0 W resistance, 15.0 W inductive reactance,t dp(z94(0 bsyrh/2wbhj)erm 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 resistor, 20-m+ey,t sx5g--b1n h yr(oxr is6ps8fv5H coil, and 1.0-mF capacitor are connected in ser15+ gs,5px rhn6 b8fx-ryty(v os-iesies?

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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 resispxpib wf5rfdw ;6s46uy ,n0 1ntor, 20-mH coil, and 1.0-mF capacitor are connex5b sf0nyf 4 ipwp ,;6r1nd6wucted 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-mH inductor, wjd2v+ j z pmj2we0a69)) vqxzehat is the impedance at 100 +vzeev)x z96m)pjd2wqa20 jj0 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 co:zn8j2cq vrbm9qs f;5nnected in series with a 20-mH inductor, what is the phase angle at 10 z9n2j; vq:fc r8qsb5m00 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 20-mH coil anprq7m3wf; k3qhyg) -2qj2 uxvd 1.0-mF capaci3x;q7r 3 )wfqujkmy-qgpv2h2 tor for a total 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 resistor a/ :pjvvxji2/ yvyv g38nd 15-mH coil to get a total impedance of 1g /jv/x 3v:2yvy pj8vi10 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 seri: +syzd3q8hwm f 3xrh aragp8 1ql()de27 as1des with a 450-mH inductor at 5000 Hz for a total impedancehlq rds+d88pafyz(2mqg1d awxar:7)13 3e s h of 40000 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 p1/cchmlb 81:ub vy 89e1cohsnut in series with a 100-kW resistor at 1.0-MHz for a total impedance ofunl:98c1 bc hosyc11bh mv8e/ 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 p7)cpge z 4a,nk*q0 uv zoe*3osqpxs(b/a4g +impedapu esko o as)*q3vc +,p7q e/abgn*0pg44z(xznce at 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 car eb2mik7.y3lp6. xkzpacitor at 1.0 kHz for a total imp zeky . 2xplkmi.367bredance 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 capacitor at 1.0 kHz for a odv(zn7.a1 5dg wwdf2phasv.f o 1d2z d(nwa7wgd5e angle 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 kH-mg )2ejv bh,tz for a total impedance of 45vh), mgt2-b ej 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 pha h(fmnh:fn6a gsw5d ;)se ana:gm5w6nh ;f hs)(d fngle?

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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) crnkip7z3 9h and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connrp3) h ci97kznected 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 caz crqd*-t fl3)ew,kz /go25okpacitor, 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 circuit2o3cgf/koq-erk 5,zzl*t dw ) ?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, a f2d.r ig-5j qdich1:n)jb,co nd an inductor of inductive reactance .jj- 2 )d5crc:hifbg i1nod,q 30 W are 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 circuit0m 7txcqju75u containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 670t7m5 uqcuj x0-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 resi l87b*bkszqv *stor for a phase angle o7kv*bqs blz8* 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 Rq enn.07 /dz7vs r txg/.erv3k = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sogvq/ / zr3k7.7.tnnxv0es d erurce?

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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.b1lj g(x0g;z7a/fkt x,s wr+x 0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactangkt0lr 1bxx+fz7 x j,;ga/(wsce, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circu+x+.f;xklb;zuzl 3z t2z f1yiit 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 W5b jda0if2 u2r and a resistance of 30 W. What is 2ji20rufa b5d the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50 eau.;cltlvcf yah8888 u0u2gk,p5ud-W resistor, a 10-mF capacitor, and a 0.45vht c.f2 8;ucl5adau0ge , 8k ypu88lu-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 cj;3d v w*gq4cdapacitor and a 15-mH coil in series?d *w;dv43qgjc

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a respy +o(rytk )mabj/c0t- 3e.* u7wouev onant frequency of 1kb - e *3jve/(r).oywuoumcat7+yt p00 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 ph1j9 -+a2cab wjp zd h0mmop. 5-i,qswith a 3.7-mH inductor for a resonant frequency of 10 .a0-mj -qc9 ,5podmh+2sp bwzjphia1 00 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 pla2b /ogwfw e*v/ced in series with a 30-W resistor and a 40-mH cofego*vww /2/bil if the resonant frequency of the circuit is to be 1000 Hz?

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