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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 magnetici 1hv6lu 8d rb69uke2f flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction s4rk6aps5egep41 lca2 id,lp* tates 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 lo:p,2iv2cdq 1:nvt iedjq b50rops of wire in a coil produces what kind of change on tdpnr 1 2d5v0 qiiv::q,ctj2 ebhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through amk0quk9+zoth b9:w ;x loop of wire produces what kind of change on the i:q; bhuwz0+m9x kt9 konduced $emf$, 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 prodlt4;ujg/ g 4 o 2p*a hnzd3/nux+hyc:ouces what kind of change on the inducednapgchjt2;+ u4 ng :3x/4uo/holy* zd $emf$, 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 froc tp( 0m1.hvqwa92au tm a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's lm a,bstyz 4o tfaa51+ -kfiv:)aw, the direction of an induced current in a conductor will be that which tends to produce which of the following effect1t+ :ff5-,4bi svya)zata mkos?

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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. j8 9+bny lc 3hrp9g9dhA bar magnet is held above its center with its north pole pointing down. The statgjdc9n9hr8ylb h 93 +pionary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tablvsv,,sjk;68 pjz.e 8qzs2bh re. A bar magnet is held above its center with its north pole pointip;hv s8jszq r6ze,j2s .k8,bvng down, and 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 the mag184yx jqx j8xgnetic field vector points straight up. The magnetic field vanishes suddenly. When 48x x1gjjy qx8viewed 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 ta 5eo a;kgx16.mhulnm d*2o-b x1ey5 km.tb.qmble top in a region where the magnetic field vector points straigh 1.mxab5x o2ymm ;dn5 *ehk..-boequ kl1g6m tt up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horiz v + h+dwmh0we5)qun;yontal table top in a region where the magnetic field points straight down. The magnetic field disappev++ h hdunqm0e5)wyw;ars suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tablm 8/xq j n5zm5;eivfu.e 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 above, the induced curren/u85. z vmiqje;mfx5nt 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 ljto sj 3 m-6waxq-2cy/oop of wire with the north pole entering first. As the north pole enters the wire, the induced currentjs3w /yat6ojq - m2-xc 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 :p (lcge,e/jrspeed 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 o:e( grp/j,cel f 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 spj6tocd:kb 9i7km so/)eed 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 of ro9 smib 7/:6ockj kdt)otation 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.f k1qrhn1pj)z5aq, 9 t
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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 thjz i(eg*03a what 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. Thg0i uzy(.j yrrg8)j9 ie $emf$ 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 (orien (g.oi-8 2bcl hb0pwtzted in the east-west direction) is moved northward at consto8b0(l 2 pt-.ghwz bciant velocity through 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 veloc 7xa k h+l,4e,i(ckdcmity $\omega$ 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 transford* t6km g8sc3zf96tf jbd7f :;qyy6ewms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. alt oo e *a20qvyia s1q;y+,5(utj2j fThe frequency of theiy0e5v2uyql(1f tt*jao a+ qo,j2a ;s $emf$ 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 d acwn;,(nyw6l evice 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 dix- .k5iump:cxm ba:2evice 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 cevyyi., -njr k 5g;mk1ontains more loops than the primary coil then it is a,5k-m.r yyv;e1n kji g

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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 2tm i:nb g /1qy8ke6qfsecondary coil thy6tk2gbnqi q1fe :/m8 en 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 in0*tqu5s1,rsztl gg 3ai 7 u6gpput

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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 resonat *dplq/-z :ykdm0j .ent circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery f4ze0/c3kn43bzaog j of constant terminal voltage. At the moment contact ig4bo3/j n4kz ea3fz0c s made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inm0: bpo4ppji0g/8 gxiductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made witi :g4 obp gpi0m8p0/xjh 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( z/i cs,a*omjj(a hf0 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 wit8(aby0p r k4buh 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 g b/8(.z4cry2 mc;uhnb7p1qq.rvu 5 z8w cwhxconnected in series to a battery. The time constant for the circuit rewm bbcwzx.1.7n;huzr 4yqr ( g 8vpqu8h/ c2c5presents 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 gw yvdwg a98:(are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to deg98y v(wg :wdacrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except:qm/enxov;; n- smfl: -

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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, t,fca /iae:g q;he 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 conneclcyezj;ql :z4m k)5)qted to an AC power supply. In this circuit, the current zyzcj5lkmq:q)le; )4

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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/yu *oeb+r2t+ fclx3g ac circuit changes by what factor when the frequency isx2eg fr+lb/+3tc *yo u tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductie5gm8b1,xy vq ve reactance of tha1 byeq,vm58 xgt 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 in9yoxqkwd3,-7 n 6h rtqductor approaches zero, the inductive reactance of that coilx9tn3rw yk6qhqo-7 d,

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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 circu 4z:rsp5a(bn j8:k zegit, the curree8zp b: kn:j5az4(g srnt

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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 changemf jz3ljv4 l868m2u ges by what factor when the frequency mm6gzll8e 3 jjvf824 uis tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor appr+yj 8v cf0mywo hx5,k2j5yza+oaches zero, the capacitive reactance of that capacitorz wky8yxvmy5jcj+o,a+02 hf 5

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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 vo3lhhv jxqza )to4wh8 0- )dhhh9sm :j5ltages of the inductor and capacitor in a RLC serieh0 :ohxv38 hsqj95 )jh -ha4dw ht)zlms 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 defing4nfay6e(kn hmc*r* ;ed as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increases, 8 :cvqc kxmes ihol.812zh4y. When:xi zoqy8,l c4cehk2 m1hs8v. 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 impedancv (h c7lk:5+rg) getpqe of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impe2ikt9. -zv oen2bqd 6: 5nqhdddance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuias0wh -((w+rip0sh l yt, the resonant frequency of that (i(s+w- ysrwhhap00 lcircuit 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 applieg:/bt -kk 4o1h;od dxed 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 occurs lry9qsou) 1e4g pn. l-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+(da ta)rg gcv 7gk. 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 vector arekr (ggvt; . cm)da+ga7 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 7sdod2wd*.y7 sg3 wgiin a uniform magnetic field of 0.20 T. Find the magnetic fl3iyd 2go.w7gs7w * ddsux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0w0f+ydov1 qwr:s s kv; ae04e7.20 T. Find the magnetic flux through the loop when the plane of ee+s :;d1r04 fwosvy7 0akwvqthe loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loohqh vwotvzpqmmf :;1+ t (a1gjoy 1t)t/1po) 1p 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 changes froml7byfhw r m.jzn*d q:wp3(t641ur s/z $4.0 \times 10^{-5} \; Wb$ 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 h gxfd04w5 u+q200 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 uux+q40 dwfgh5 niformly 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 tur*p(ol6:(ed huwv/p ct)h wm4yns 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 f-ue8/guhmoc;wwien;3,n 7,-vt p c s $0.20 \; m^{2}$ 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 spr1u9q,d5m h3r 3otzcpan of 60 m flies horizontally at a location where the downward component of the Earth'sdq orhp utrz93,m 531c magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rozwsbsu9 1,ze-lk1w 69phbj -xtates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic 6bezsp-jwbz9wu,1s-9lk 1 hx 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 genera 7/m8ep3 mts q/0miieptor has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turo/ 0 x;nqyd1lzns 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 on its armature. Each loop is 12/ x7n hcl*twa,,yfjb8 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 fijnc7 a /f,bw*l thyx8,eld 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 turnf3 xsw vk.app/b(9yt*m/9r cofas93is 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 wjyo wy dlp83;8ith an output of 12 V maximum when rotato8dyw8 ;jyp3l ed at 60 Hz. A magnetic field of 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 genbvjtmc4 g.f *)erator 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 /x5 *l v1uf35yr4sgtduvoo8v 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 a resistance of 6.00hf fdkmw 9efgk2oj0cgl+6 r1t7 / /4va W. The motor operates on 120 V AC, and when runni0 fhm6kf 4w joe2ggdl / +vtr79kfc/1ang 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 connectedrs me2az2q2l wbj 189s to a 24-V power supply. The operating current sw9l8s2 b2 ar2eqzmj1 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 rb cu:pn4t5zh pex:+-mesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spzpnut+m eb5ph:4 x:c-eed. 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 resistan;gef /)+e/z p ua kgo5odvn0sswcf7(5ce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the b0 /fpo g5nekd oascsv;ge5uz)f7 (+/wack $emf$ 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 red:smykc cgw58 xm2 8al+uce 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 cau:auoh 1i.o;qi f:,p8z plk qkv.*v7 iuses 14 A to flow in the secondary. i q i:p;o,8uzq 7po k*ku1..vah v:ilf How 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 prima(fyai wf-: tv7uuyy4* ry if the 24-V seconday*i ( y4ffvwu:a uyt-7ry 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 coil and a 2000-turn seco8wm;/s7tp gce.emy r7 (6zyan ndary coil. If th(e7;/rcmtewz6my 7n s.8gya pe current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. 3x /-ak mo9,tu z,ckaj Assuming 100% efficiency, how many amps at 24 V can flow ,u-k ztamxc,o/k9j 3a 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 si;n i w,eklw*dn)xk bn6 :a1cj. 8ybbd6gn transformer provides 7500 V at 10.0 mA. The prima,j) b6w*x y. na1k;wnnc i:db d6lekb8ry coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns onhzy-,go3wc axmt 13h17o1b ku its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secohh- 7 c11w3gmto1z,kxb ayu 3ondary?

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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 oc b xmkyfc4gr(:2 *d5on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondafy :cr5b2( 4gdmox* ckry?

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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 secondary ur e1d(+yn4me5xl +r;qi2svdhas 200 turns. If the input current at the pri4+2 nedyqud 1 mrxisl; 5+e(vrmary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns anl d ip4so/mf/slrb 4vl40c+u (ca52obd its secondary has 200 turns. If the input voltage to the primary is 100 V, we4lb 5c(i/od2cba0/ u4smlfrlo+ ps 4v can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has .zb15usx0 2ras )x lzo200 turns. If the power input to the pri 0l15 b.so2zxru) xazsmary is 100 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 produces 60 A of current at 120 V. The voltage iihak/ :lbmsq4yz3+ 9 e- jzhs3s usually stepped up to 4500 V by a transformer al 34 qszms93jib+a:eyk/ hzh-nd 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.w9gmm, k+4wnvqh 4 of V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totalhwo4mv 9wg,f4.m knq+ 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 60.8c)m fc zvk g7uny4c. A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage) y. z.vcn7kfc8mg cu4 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 8 slt*,sn n9g+2 kadvohas a total resistance of 0.60 W. A generator prod* 2v+n9nstgk8 sado,luces 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 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 lirmmt//w b*5gik*w,eo ne 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 wemi tw*km/ /r*b5 ,ogline, 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 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 p f.cigvc+6zr( ower would be lost if the power were transmitted ac (f.zc rgiv6+t 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 40b lpahp9ng;+w 5tjt(40 V at 20 A. It is to be 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 in transmission is not to exceejbt w5p9gph0tl;(na +d 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 +3 1ryn8gq 2ejf e.txyvxk;g+A. How much energy is stored in the coil's eevf gxknxg1j2+r +y q3 ;.8ytmagnetic 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-)tyn 081/ hc;uyxggjb +ppu, gW resistor and an 18-H inductor. What is this circuit's time con+gn j8 uthy/;)gp0,gpbyuc1xstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where t )0ivv3z4zl 0vszev t1he 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 curmhh a2arh7*aje( t,xp2/0o y(nsj6uarent?

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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 outletu) zao n8ff1p zgz/d,qc);7zf. What is the resistance of the lamp?8,;ca/p z1 nfuz )qdzof)7fgz

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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 ps 8w52tifo*q yower supply. What is the peak current throug8s *2iwt y5ofqh 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 connect ybowk6;1d.b.*h pf zmll(zx0ed to a 120-V ac power supply. What is the power dissipam*w; 6oldb0z..b xpyh ( k1lfzted 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 resistov8l 4 zesy+0xbr 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 r0f7iaza c q9qxx xv042esistor 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 7/icn+djgz d8resistor 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 )*gwg/n6 sig9 -fgcz+hk3t5 s bmwo3 fof a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil kicv 15tb1 c 0 rm yghezrm2c13xy+.o1at 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-m z 08u kmuvxm3bc(h(h-o(ob7 xH 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 inductivl9kv70 o +)d)xwczkmprgd ,aq0f +i.ve 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 AC at a frequency of 20 le5t/ /lbv i6-qw/f2pkv/nm raa9cx9kHz is applied to it?wlcl9qn/ vbv //ifat/ 2a-5me9 kxp6r

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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 25x z(thv ch/q8.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance zgv 9ke p6,fn,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 needed to have 50 ) hpala e8di1xo qbid8t+7.z)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 reactance ofhxb 83c103.j-r rnngc8kxs uz 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a jx;b,j, m*o xa0.010-mF capacitor be 100 Wax*; ,xb,jj om?

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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 capacitoyvqzw 72 0csb.r 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 y4o rd(,5lalz 2nfg v(ac series circuit with 12.0 W resistance, 15.0 W inductive ( gzdv(oln4yrla2f ,5 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 rej x6)injxm82nsistor, 20-mH coil, and 1.0-mF capacitor are connec)jnimn8 x jx26ted 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 resistor, 20-mH coilhf1cfm +yrcmu:8p l ,,, and 1.0-mF capacitomff +hy,cc8 1ulr ,pm:r 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-mH inductor, what is the ife* zihno)t:o (etg 09x5 )ze(8ybpmp mped f*m)z 9zeo:oy(8tg(t )5penx 0pbheiance at 1000 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 with a 20-mH inductor2; ws7yom 2nzowm6xy bdz7y39 , what is the phase ;d zo3m y7296w72 yszowbmynxangle 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 20-mH coil and 1.0-mFl9nhmczj/jbi *3 )xawf-:bn v(j3 u, m capacijbil()j 9*3nbncamm3 h-:fvuz / jx,wtor 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 seg 9kwm(ad1+f p ggc mrs49y*n;ries with a 100-W resistor and+ d9g *r9as(f1gmc;nwgky4pm 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH induc.9eu ,bg+n9ijjrtyxb2o8 e l*tor at 5000 Hz for a total impedance of 40000l ,e2.bi8 xj9njrbg*9 oet+yu 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 fod)s(go.:k m in series with a 100-kW resistor at 1.0-MHz for a tot)d.:ofksgom( al 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 connected in series wd5g+ emv(cve ttlk.9y7) tu n)ith a 20-mF capacitor. What is the impedanctn+l9.em))vv 5g uc (ettkd7ye 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 j o+e zqr ta nm(,9u/vr*vpps5z).5dy a 10-mF capacitor at 1.0 kHz for a total impedance of 4y ,9sr +/r*v.aj5ov qznzt edmp)p u5(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 need kf czqt)e/k/9ed in series with a 10-mF capacitor at 1.0 kHz for a phase k/z)ckeqt/9f 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 atahlxk w: :d,yu: 2qffi2 wf5 znz-(w9e 1.0 kHz for a total impedance f zya u2d:9e ,-:2i5w( wkflzxqnf:w hof 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 se3nntek xjrvi r98iar 0*u 07:zries with a 100-mF capacitor at 120 Hz. What is the phase ang 8:keavrt3n 0x07i9*uirrz j nle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a m21pig9q o p*bww9u2e 100-W resistor, 20-mH coil, and 1.0-mF capacip1mp9 2o29w bqe* giuwtor 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 o8,azydtp /e6lv kf4 tdb+0 htb(1ebm9f a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powere6(vbld4b/bm8tah19 , ktdt+p fz0y e 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 of3b3w l3 rfc wb.f)dg-s capacitive reactance 30 W, and an inductor of inductive reactance 30 W are cbc3 3.f3-rw)s bgfwdl onnected 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 resill j8r1e:gd7a x)m 39.qecsi kstor, a 10-mF capaci kl id8:jeqx raec .)7gm1l93stor, 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 ffhepreow/*(6 , s eb vdu-;g3dor a phase angle of e e;v r(do3bd-w6/sg ph*f,eu $40^{\circ}$ 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 Rzobo8;r /z7ce7f:z e p = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to havoc7;8zeboe r7zp / fz:e maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.(j;9na vx7rxb k j(j8w0 W inductive reactancej9ja(bw8k x(v7;r xj n, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC 1z;edjo m bt)h7u2b*k 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 Wz *7q+ ;.e* ,efi;r lykufctvc and a resistance of 30 W. What is the rv;cyc; fi*7 e,le uzqf+k*t.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 factor5cboihik8jrb u2/qi: (gv ;k, for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a c5gbuirqk / i;8ib2k( o,j:vh0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in5,6y 9ujq5 gw dave2ek series?e55uadwyqekg9 v 2 ,j6

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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 sv iey+exc3:p 6mvdn)8,mz t gz5-a2gqeries with a 4.7-mF capacitor for a resonant frequency of 10 kHz?cm 6pe- )dx +vt3zz5g,q 2gnyi :v8ema

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is ne 8gljqk27ts p2ec2n*nzl dxskd0s+.3eded in series with a 3.7-mH inductor for a resonant frequenc.827+lxsepl qsn3kgn02j*z c 2dk dsty 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 sertt lvio-)f;) 2iz/3by lsy9e cies with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be);ic23 let)z i vyfs-lt/bo9y 1000 Hz?

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