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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excepp5xruv2a yvx + 6 )e.qfy+m8cut

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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 stavnzt (cz38amvdk rqk+*o ;b* 3tes 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 m.-tg,zt w o mti wibkm(,bg8,z )+7dgproduces what kind of change on the in, iiz ,bd(g-t) m ,o8.7wzwgttmb+gmkduced $emf$, 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 6pljc.5hwwm 0x2*biizl1 i ik+j e;9w of wire produces what kind o+ 6mc 21ib5kii;j9wiw w.*p jlhzexl 0f change 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 proo2o6 zr 3qo8mfduces what kind of change on the induc8or62 moqf3zo ed $emf$, 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 f2xn(biw.dyuin o u73oc ; op3l(crf.;rom 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 law, the bd(bn s7. gq+4juc;pnls /a7e direction of an induced current in a conductor will be that which tends to produ js+b(un;7c pq gld 4ne/sab7.ce 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 magnet is held abo4w;s e5)b wskz6jdaz, ve its center with its nokw w, jzdesazb 4s6;5)rth pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. :pg8l+j 0 xjq0,l, yzlrd-bg x A bar magnet is held above its center with its north pole pointing down, and released. As it approaches jg0 :8xl, 0ydll+bzgq,xp -jrthe 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 magnetic field vecqefh h3:1)gzftor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induchh1 fgq:)z 3feed 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 fieldebdw+b46sb 0 a vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directi besw6 abd0b4+on 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 atw(n,ck fj7 gq5kh2/ horizontal table top in a region 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 field disappea2(a5kj, /qc twfgn k7hrs?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasim gqq .x3i89lsng current northward. Two coils of wire lie flat on the table, one on either side of the wire. When vq g q.8imsl39xiewed 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 3a;i(h c25pir4 wgsyu loop of wire with the north pole entering first. As the north pole enters the wire, the induced cur45uhis2w 3 (yp;iacgrrent 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+ m 24eys zso(/bzr0nz angular speed about an axis whose direction ce s/(2 y s0zzbonzrm+4an 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 rotaox6 1p8 4q0c 0rbw,xm-b l+u.ulesdy bted at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the indu-l4u01 sy0 +wu xpmc8 dxe,bbrqb 6.loced $emf$ 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.b8km 5uenkg myjd)).5
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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 fee2 n+ yl7bg8sfqtn y,(p5ej 0hpq3+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 fiek;1/7bd m gg jiooeu-0ld. 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 (orientednvu stxnqujf,((0s sn-kef5 e(5/ceb08tw s* in the east-west direction) is moved northward at constank*vs05uuf 5s e,qn((/t bstj -x8efcn (wsn e0t 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 constanwzyj5 38)ej uht 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 transfo52 j::c7fiig o*cdni jrms

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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. Tty 14owm,,lua f hh4x4cfiw3- he frequency of thefw c1 l4af3,hy hm oxut,wi-44 $emf$ 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 devic1; w onj iblagl8 7rwz/00gtu,v8igw .e 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 dev5jq vbkc-- hp(0xk5yma+sac)j u 3/mpice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more l,d2x)9jzkr 7e d bgm5mtjky+h1+ 6m oroops than the primary coil thedmd+r76rghz5km+9tem, y xkb )joj21 n 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 primaryt up2k 3sgj,mm(v0qn. coil contains more loops than the secondary coil then i0 t m nsqmpgj2,.k3uv(t 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 8azav;ko gu,m8r 2 po0power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant0zmsmy;-ko)t6g l6h (2anwi o circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of f.lndkg6/ rn:o ho8g2 constantg.: nlo2/dof68n krhg terminal voltage. 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 induck+4s9c sgqn. ytor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the bassg y.4nqck+9 ttery, 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 rel- ei:h3nlll e5 hg+z6sistance 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 connected;g;9 y4pkwag d 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 connecterx9 hjl;a 4bd7d in series to a battery. The time constant for the circuit represent; hblr4x 9jda7s the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Theul s,i:l ygucksw2:* , battery is suddenly removed from the circuit. The time constant for of the circuit c y:l:s wk*u lsi2,u,grepresents 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 ha+ms1w kjviig(xj5 ho*mx. jt), y,7rmh(s 4apve the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On thi-+gv+ s11hme)coc 6p v.ubphvs circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, tpn* a g:lf:tnsw +v4mzag+,2nhe curren : pan,w:gm+t vg4fzn*s a+n2lt

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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 a/z ef(fiwl8 o0 xnq75on ac circuit changes by what factor when the frequen/fnw 5zlfox8 i0o7 (qecy 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 induc iqrd+bhurbf(6g /: t2tor is doubled, the inductive reactance of that inductg(tibrqfb :+/udrh 62or

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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 volt jq*u3wc7umyx: - t5jgage across an inductor approaches zero, the inductive reactance o5q3:m-cujt y *gux7jw f that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to a6+zxx3 0wul ei)nb)c nn AC power supply. In this circuit, the currentbzlx)0u+e i)n36xwc n

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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 when the v jhqk2dpzfa88:6q8 fjo pk 8 5cs,m-kfrequeask6 85q v,kfoj2-dkp8 jf zh:c88q mpncy 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 capacit-twy ; ;5lrhsolds/x6ex)y 41emkk p0+ nmsx 5or approaches zero, the capacitive reactance of that ca k;h em5nx1lx/4s; e0sl 6+o)ypm5d -rkxyswtpacitor

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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 lq(spy19dys v* fqehm5 + zv/.the voltages of the inductor and capacitor in a .svm1* qqlfz(e/yp +s y95hdvRLC series 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 kl.3clk m1wyjh4/eh8/ bp3nbRLC 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 circu t41(pprr uv)sit. The impedance of the circuit increases if R increases. Wh( trp)1p4rus ven 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 circua ;*j;rwlb1lo;aa rl/,ijw.vit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series rchuvt/9 o v xk9 a8e8m3jwa7yt; 40xzcircuit. 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 double in an LRC ser/czv nj(ro d61ies circuit, the resonvzn jc1o(d6/r ant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage.zhse)5j shl3. 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 seriel/t5nk9 (c+w- l bqdkjs RLC circuit 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 uniformon5d pd5l 18jf magnetic field of 0.20 T. Find the magnetic flux through the loop when thlp8 f1onj dd55e plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 l 1c1p jyfg+k0+)oqjjc/j3yk m is rotating in a uniform magnetic field of 0.20 T. Find the magn+ kgcj/1klcopjy1f+j )0 3 qjyetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0 u0.7vd9 zay-pfuzf1u .20 T. Find the magnetic flux through the loop wheu0a9.f7d 1 u-zpyfvzun the plane 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 area of an adjustable single l4 yf 08jhrowxc/:q,zloop 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 ca-v:k. 3e rybcoil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cj(b)gm 1p61ge dwiw7lcacd;5 m. A uniform magnetic field is applied perpendicular to the plane of the b) g lw; (ec c1w5jg6pdam1id7coil. 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 wirexyaw2f7 k2 bbh yom.24 with 15 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 6j7,v cjrm z(le,xhi6*qlw( garea $0.20 \; m^{2}$ 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 3fs*b5jvzcu 5;w vp /zc/trs) zdi0n8span of 60 m flies horizontally at a location where the downward component of the Eartitn)0zfub35vvr c * c5zp /dsz/;s 8jwh'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 bar that is 2.0 m long rotates at a constant angular velocitstb9u- prg w 3 nl,+o7gty*h4uy of 2.0 rad/s about a vertical axis thr usntrhy *o,twg73 4-+g9blu pough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator hasx(p ,qc;.*/yjemuoe f 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 turhb/*q zke2p*w12b x/t60x i lze: tiaans 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 o zvt+tmz4fzwy:tfa1- tfw28)n 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 magneticzfmtz1 afz w2-w8t)y4ftv+ t: field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wibz zj rgx gvgcu;4fd+:c3 2j+c hcats*/:u ,b1re 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 simgf6z x duupplj;6o ,b+ot+,d 0ple AC generator with an output of 12 V maximum wh pb+;jxtd+6uogz0 dl o,,upf6en rotated 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 rtp,4ctoftp+r4t0: d 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 motor have a resistan1 je ,q)v, 6dcfu(xukuce 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 DCfp-ud j-tupv:s1 )w/p motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it gene1ptppjsd )--w:vf /uu rates 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 resistancece;(i1 th7m4pkq dyu2 6.0 W is connected to a 24-V power supply. The operating current is 1.2ci;h 4dukpqy7m( t e10 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 2tip( b3l/rkaft0o3tec1gvi* 9- g-eu4-V power supply. The operating current is 1.0 A at full sp -kul 0gf -i(eae1ot ct/r bvgi*9t33peed. 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 connectedqs bid x+q si/((d0l4u to a 24-V power supply. The opera /sbxdd+sqi( (ulqi40ting current 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 2 kojd2ynw 0 yqiui480needed 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 transformey5 -j3tj,bhf1ym,b4m yg8y of r causes 14 A to flow in the secondary. How many turns are in the y m 1o,y5-gm fhyt3fj y8bbj,4secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V sevta o1k)b rgj(sb- 2 qcde,y75condary has 100-jad2yc,r) 1 qeb k7o sg5(tvb 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 coils* v*e7mz. 7h7lnj-)a iyo bdi and a 2000-turn secondary coil. If the current in the secondary is 3.0 A,.mdn a*) hvoz7l7b s7ii- ejy* 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. bo)agt-/x x8wj))sc xhij-)p Assuming 100% efficiency, how many amps at 24 V can flow /x8ojtc-)-ap b)jwxi hg )x)s 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 trans0- p e:v759lk ldrcjtuformer provides 7500 V at 10.0 mA. The primary coil operate5u7pvr jle k:- 9ltc0ds 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 cozzr1 gbauz6;- il 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 se gzu;b1-r zaz6condary?

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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 oni+k :pchr, h1h its primary coil and 300 turns on its secondary coil. If 120 V iphk: ,r h1h+cat 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. f.b uepu 3wtm8dguc: tt6/4l /If the input current at the pri6f.wt4lt dm p/:uubeg83cut/mary 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 and its secondary has 200 turns.z4 1ym4 xwl (ptg6 flhboh;+4w If the input voltage to the prima4 t1my b+l(4og;wxpzh 6f4lwhry is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. 0mi*b3 ..cq urr)rba y If the power input to the primary is 100 W, we can exp y.b3u*rrqir ca)0.bm ect 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 curreniw+6q7lkm7rgx s6)10eoun lct at 120 V. The voltage is usually stepped up to 4500nxsmeg)7kcou+ q7 16i 0wr6ll 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 uuk8le8tc c:m 5y.ggc( sually stepped up t8cg(mlcc gu y.5t:8e ko 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage 5h bbq (f*y f+byygvrmb)42;v 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 vfbmy5+qb)y gv4b2hy*(f b r;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 owv -p c4(x8chz)zaguo2b27vy8j*fd line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer witzo acp*)8( 4uv jyx g-v7hdzw2cob8f2h a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long :7h : dru7ot8myw x2iqhas a total resistance of 0.60 W. A generator produces 78im2toyrwx7 dh:: qu 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 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. Ho pywyehbt -)7bzieyd (+ +xm*nbm8u7 d2rs g8(w much less power would be lost if the power were transmitted at 3dex+2b)*(bmmh7-e+z y 8dswyypgn7ur( 8 itb000 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 generato-mg4kd 4r kn)+7v otltr is 440 V at 20 A. It is to be transmitted on a line with resistance of47k-rmk4gvl t od )nt+ 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 7*l koqpty3q 45.0 A. How much energy is stored in the coil's mt4op3qyk ql*7agnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. jx;8 glbmu 3wjggxel m 0a4 )sc7c4j5)What is this circuit's time constbmcag ;cjlxe0lx 8 ))ujg g47j43s mw5ant?

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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 wod 9 4b06w rk8c.t luecqj 00kjpp7de3here 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 out*qs;sfcho ot n6g 7*8wlet. 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 2iqqr7 ksftyk.r 82 c:AC outlet. What is the resistance of the lam2kqyt sqcf8i rk:r.72p?

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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 czpzyeh w:wsymab(, .p (q2z7;onnected to a 120-V ac power supply. What is the peak current thro(7wyz zw q.hpa (yz:,s 2epbm;ugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply rxr*9wt /5qfs.e h1ky. What is the power diss5 y.* tek1rfw /srxqh9ipated 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-W0.,c sgg1gopv4.omi1q c:qdv 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 rzh.e-azqz dl83y +uh(esistor 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 rkxpfq4( h-/fu( 1;na;i 1tytdr bl4rzesistor 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 e81ywrqf cy9d )9ol e, ;74auz4t ifmuat 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 at 1000 Hzs.1 tnge c6r2vqagn4;?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wilk) mxr,assq+9 a:ozp9s 65 )nbm.itfql a 14.0-mH 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 1ui:8bz3glzf 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 p3qklkaz,j r6 tv1;2t inductor when 120 V AC at a frequency of 20 kHz is aprzk t,p63;k1q 2tvjl aplied 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 110-Vsvy2ly ss)td ry:5/ ,h, 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 at 10 kHlk( jlw)3d 5jbz?

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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 t2x9x0e,dv7f n,8yey-xam rf1 3s jxye 7i9wbno 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 h6 6p p3gzks8uxwa7*nkave a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capambz ywhn )bao)z 0eg5hi87: )jcitor be 100 W5)ajn b7b ym)wg80 hzi)oez :h?

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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?s kx6/qdq2 yqi6iq tp:wsi(o,m4 1.sr

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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 serie0r+ x9sjqfog w, x :c-/df5opzgaf7 6qs circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacta-/70ga ,wpqffoq9f6c :zxjsg xro+d5nce?

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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 resi od1kkb+rc)pya5 fl5i b59k4i stor, 20-mH coil, and 1.0-mF capacitor are connected in 5kp1br9 +) dkk 45yil5ibcfoaseries?

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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 anglef8+v ( gqt9fzp2jq(y5 m3cmbe at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capac58f qtqfecm z9 my+(vb3(g2j pitor 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, ,i8 3 cdnzi /bla;ze2rwhat is the impedanzdl/ir2c i8,;e 3bnaz ce 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 /y)wl7az 1ybs20-mH inductor, what is the phase angle a/)s1yyzwl a7 bt 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 coi g5jm 4qj7s zqu907g.0ra o y4ysjwl9gl and 1.0-mF capacitor for a total impr u9y. wm0zgj 9jsqjg7q0yas4l g5o47 edance 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 dlo vu;k6*nt0needed in series with a 100-W resistor and 15-mH coil to get anlk;o0v6 dt*u 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 serv h66l98oco, 9 j2o wzzinn/byies with a 450-mH inductor at 5000 Hz for a total impedance of 40000ho o6l 9v /,iocwnny8926zz bj 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 7 irn*z(u8j,a, f5fqsi lws b3be put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW la,8n(sfi*q zi 3bsf7w,jr5u?

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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 impez 2e+ymjp(8 hyb -6f +jbnchr0dpjmznybe+(hj0chb f yr8 6+ 2-ance 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 capacitor at 1q9ldyu;f rl 564.o ma:d4ol kv.0 kHz for a total impedav ml 5l ao6r.l u;f9:kod44yqdnce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in ser.yscry t;,x l hxwpsn98j)8n0k,9gfc ies with a 10-mF capacitor at 1.0 kHz for a phase0p)skwnjx y,9l xsc c 8nt,h9r8. ;yfg 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 wh-. ta2 z)bxdmith a 30-W resistor at 1.0 kHz for a total impedance of. bd t-amz)hx2 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capaci,z9 u8wkx2 zjcal+;uator at 120 Hz. What is the phase ang aua x,l9u zczk;j8+w2le?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1., + zjmc)hr81 knugwjk*a49lv -d7was0-mF capacitor are connected ia sh-,1)7cuk+drjna9g8 mz4v k jlw*wn 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 consisth6 kuzmxk kh(s;3o- u5jw( t;es of 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 power supply. What is the rms cu6;kh ueowxszh(; 5k3-jk(tm urrent 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 capacitzx(3j6*vh (e ug6y2zm t,brsqor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz po 2q,umhgrexty( zb 6s6z (*j3vwer 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 resistor, a 1x 5yt 0vrl3 n4f-l:sxu0-mF capacitor, and a 0.45-H inductor, when conner l3sx fu 05:y4ntxlv-cted 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 f 9/fegc2 iez2cor a phase angle oec /9gze i2cf2f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At ekrfqks- 1pawhvu :53m0 3 p8zwhat frequency should the circuit be driven in order to have maximum power trm 38zw 1kp 5ka-hv eq0pr3s:ufansferred 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 a0+ aah.,tnk3mzeotlr+uw n gx,)qd0, c series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supklq +gu eozd tawn0x30nh,)r ,m+,.atply?

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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 cilb0 qmqah6u 914vg /e uw;tq.nrcuit 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 i wucza(0h3r,q(jw xt z 1o4,qa resistance of 30 W. What is thwuiq,h c0wx o1zz4t,( ja3(qr e 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 c; sgufbtcs32fc xyj3c5 x45,yircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,ss4c,f 3 cc5x2 5y;y jgbf3xut 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 arl7shhard, *)nd a 15-mH coil in series? dhsa*r7)rl,h

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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 cat 0v)ait3b9 iv 6ly)2cux0a2/j vzfpnpacitor for a resonant frequency t90j a a23v cyiv 2zfnlp0 ))but/i6vxof 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 for a resonant freq6c6 mv4jse f* *o2bvtduenm6 *ebc*2vd tfo4jsv6cy 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 mu1fl5z b8n -1ztwj.zd bst be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to-5 bdjfwz1n z1.lbzt 8 be 1000 Hz?

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