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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 are units o* /u )c5nqguxcf 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 inductio v plzvz;ahr6 3yv0t2ji./t,l n states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces 8tgk5huo*)3 svc uxf -u5w;zl what kind of change on the induced v5)txguhswcf3-lk zo *u;5u8$emf$, 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 loorzss:xl 6 l/(r -wqcgg)a-+ kkg81t app of wire produces what kind of change gzak6cqsrs txal-)r k1g8( :p l-+/wg 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 what5i3/ nodg :tpobaa+rsiud8 (n6 )*zi*,kadr n kind of change on the induce o pn o 68 r,g)*rand 5/iuz3kitna*:disdab(+d $emf$, 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 fieihpc- j85ftd ;ld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor willv7 f)hg:cbd pv;q3w-yarb; p1 be that which tends to produce wpbpa :) 3dcwhbv7qrfv y;-g ;1hich 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 a1ixh f.dbb;ht( 9:u2sm2viz;e*b jaq horizontal table. A bar magnet is held above its center with its n hqbt2f.zbi;dmex:h s1j(9;ub2 v *ai orth 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. A bar magnet is held abovpe az2ohhc6mj . n4.s+4qo- qye its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet indu. .j-hh 2o+ ey4q4ocq6m apsznces (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 vector poi4 isc qe,+ f1ovq/jhu 2*ffe,2h dfc6gqp2q g;nts straight up. The magnetic fi e2jqeqf ;is cv2o2f1,qhd*gc+u/ffq h,p6g4 eld vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a; ee)f5-bircf level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as t ee cb)i;5rf-fhe 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 horizonfly7.*2hdbb o2v gil;kq,b 2m0afs 1ftal table top in a region where the magnetic field points straight down. The magnetic field disappears s i02bl*;gbff2 7f,dmko1sqav 2.y blh uddenly. 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 h9avw ldlmqbnetnd1 l95 :mc7 e.8zl-(orizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the : mdvtlzenl(m8llw1 bcn5ea9 qd 79-. 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 north po s1 ;f5exu za-ghay:h/le entering first. As the north pole enters the wire, the induced current will be (as viewe5f/zuy;:-h1 xa gsahed 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 cond)e(m- ubavn6 mfp 8oocm yr)8rbu 301s7tzx; stant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wha 3to -bpr7 y8cm;mmeu unv)od 8)bf01xsa(r6z t 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 ijrl- g (kdk*j,s rotated 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 rotatiojl,( kkdgr- *jn 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.*.ldpq,t mx6 h jb4afahj(y2fqo 8 9:j
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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 tha0uoz+l dyb4sa / j( +,meoyw6ct 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 magn;4q b4 la2hhvgetic 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-west8hcc;js3y,fp 8 dcb7t direction) is moved northward at constant velocity through a magnetic field that points straight down c,b ps8c8c7ty h;j3fd. 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 aok8vk 2l)9xva qne5 a3xt s;.lt 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 tzcs. et6*n8omy r*;ipx2m.ygransforms

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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. The frequency lmi+zaa .g4 m4of thl .m+az44agi me $emf$ 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 device ujuz j v*7b-i5zsed 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 devic:jjn)s 7/bh5 qwkl nx70qhf s2e 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 contai)gzvm3k qoz9(ns more loops than the primary coigmoqz z)3k9v( l then 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 primarhde 4-m vn8s:by coil contains more loops than the secondary coil then d:-bh4nse8vmit 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* fe2xt pawa-j-x.ty:f hp1ot4f w,t + input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit,-k9dsekshb5q ivd zq fr248n*b,6/ pu

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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 batteryn 7v *xqfk63horx63rrzl6u)y of constant terminal voltage. At the moment contact is made with the battery, the voltage across the xyf vn*u6x6r7r 6 rqo3k3lz)hresistor 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 se4vuh myo5ma 0 2ui)r:/,v cjbattery of constant terminal voltage. At the moment contact )j4u2y0aoc5m s:vu v,i/ehmr is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is c4v -fthv0gp( j;v)rgconnected 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 to an dzl+c 1pljsf rr 9/y:,$emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in serien/ a.dddl*uc0yyx3)z s to a battery. The time constant fz0d)dcdula yxn /3y.* or the circuit 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 ba(qwx w6hrvl-dvav -* eu);9n h4gfsi) ttery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decv lrh6 w* )vdn(a 9;s -if4uev)-xwhgqrease 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 ;w1,jxb o(kh5 dn a4cmrg +szmw48x2f 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 tr;teqyj4;jmwg4 x -p;o an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supplg- jvfxgy z 7c -ohygd7o 5waot3406wx;.ep1iy. In this circuit, the curren .pyv echw4g gz0i;wdytf53-7ooo7-xj 1 xag6t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor tn(k hy5 i0ff(cn,1d b gjll42when the frequen5(tb20dc1lnf f ,4j(glni h kycy 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 doubley h90/ cm5t0jn6s v enx 1duhzg(r4g6vd, the inductive reactahmg 1656tnze 00s urhdxv/y (9nvgcj4nce 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 indi92my1nf3cq cy dc ea4z6e6:juctive reactance offd36e 1ce:2nymza9iq6jc cy 4 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 cony;s :p(t/vwah 9g j.stnected to an AC power supply. In this circuit, the currents pt9vt /w.g;jsa( :yh

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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 umgcc *c/y 5g2cd3kn+the frequency is tripcyc3gnm+gd/ cku52 c* led?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capo : 49go)i6t;gt axmjhacitive reactance g)4hi 9oj: tmoa;x6 gtof that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capmoyv 5fr/s(5n-o-lrl aiz k*9acitor in a RLC series circuin59k (oamsv*- 5y o rl-lrzi/ft?

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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 an0 /wg*ge* odc*(kobw4h hu ievar4;/v 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 impedance of the circuit increa rb4m+ot +ihy0- 9mg:a 7ug-s:n nmgaoses if R increases. When isn:mtn70o is-m+ mu :ggr-+h 9ybao a4g 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 in 21e;vy3 rw8mm3mzxgqcreases 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 iz3ez4 prhin,8 cvn+5mpoe/ ;ampedance 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 d3b(hgj e;mps9ouble in an LRC series circuit, the gm3; he9 pbjs(resonant 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. At retcry(06pwn*ud* q pbx;/+r izsonance,

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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 occng*mauv3h12cq hmh/x 08r5 kg urs 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 3ey3u p0t)wlm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loou03lm epwy3 t)p when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is r (7ds g3vp3 n- 95kcoakj5lekqotating 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 fie k5ansp(3qk3o5j -e7gd vc9 lkld 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 un/w;9ca f,( sb:tcdawu iform magnetic field of 0.20 Tws9uf wad/:cc;b ,ta (. Find the magnetic flux through the loop when 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 areagcvxq)y ji4-) 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 changes ww+o8 42ftp c)ux9t s2de atg)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 i0eu(ubv3 )gj w 11yjoa6mas )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 thy0bvus 1 (mejigaj))1w6ua3 oe 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 turn*f q/83oj w3i7gouu* md 5xqsqs 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 a;ep3vy +;+q /kqbay mjrea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locam3sgu uqq/i h:4 q,;oktion where the doio,qms hg:4 qukqu/;3wnward 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 bar ,.i- k+4g cqj7on8 4llcui ffythat 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 whilqiu4 ff7 c 4y,kjn 8ocl.ig-+le in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loopsno. e05zq;s(dy mhi.e 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 turns of wire of a 052bv 0luaauyrea $0.090 \; m^{2}$ 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 .e8 xc(2je3 ebkof8zacm long anck.8 3az eoe fj(ex28bd 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of 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 consisttx3u 0qw:hk(c ;gj xr qza*(e.s of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construckvaihy5fpk9d*5zyyk 32x -9 n t a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T iy9x2h-fad5 *k kpnyy9ik53 z vs 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 generator with 1pihr4de,:0z lr9iw d a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Thg2p8bbcfa/g c qy;4y2ahxjg 1 lkk *)0e 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. The motor operatrvb 3;7:-pt s9h v*ldeke( azhes on 120 V vee7zlrhb -k*;hav tp( 9 3d:sAC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Th)(sz *)yibw- amcr; f7(nblzbi2u .cbe operating current is 1.0 A. What is the start-upsb)a nmb )l7y(* (;czzi.b-fcuwr2b i 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 smsbk9tdg3-, sed: ijnj1xv 3+upply. The operating current is 1.0 A at fulded+mkt3s -g: 39sv,j1j xnibl 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 resistanc:6g.3k snlso de 6.0 W is connected to a 24-V power supply. Thelk.gn36 sosd : operating 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 needed to reduce a primary voltage of o1- *jj zgof. s*m rxqp :,w4xx,ztgdgh :(2on$120 \; V$ 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 A to flo c ;z7zkwy)2i71ntddtw in the secondary. How many turns are in the seconn i dzydk 1t;77wz2tc)dary?

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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 neced,ojhafd *s/hhnn+h)/.wh . lssary in a 110-V primary if the 24-V secondary h.+ d j)fo n.anhdh,h/* wlhhs/as 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 -zt(v0vea i* e500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wt0ie(e- vazv *hat 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:kcg 8fnw ;).egnchv. primary of a transformer. Assuming 100% efficiency, gw:nfce 8k.c v. h;)gnhow many amps at 24 V can flow 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 trani0 botgz+tu ,at)y */qsformer provides 7500 V at 10.0 mA. The primary cg, tta )yt +q/ioz0bu*oil 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 it sc8y a, upzn8z+j2ch9s primary coil and 300 turns on its secondary coil. If 120 V atcnzh +2zy8 jp,9 au8cs 2.0 A 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 6g5t pr.i 6g rda08ar p;,swo4k0 turns on its primary coil and 300 turns on its secondary coil. If 120 aawdr 08 skrg,5p 6rp; gito.4V at 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 transformv99u 8hvaucwukq+mkv ;n) /b )31edzt er has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currentqunc z+dkhb)89e) v1/wuvkvam u39t ; 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 up17xrqv(-93sll fmc100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vo3 x-ru(cmfvqp17lls9ltage 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 .z1; jsbosanex+m n,8its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the powznox 8ams+e,;bj. 1sn er 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 is usually stiu.)zjf 8s0a 6 mnztxfr1g2k, epped up to 4500 V by a transformer and transmitted through a power line of total rex.,8 2i6sf z 1nkz0j a)mgturfsistance 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 vol8z39 fi whkn97v3 pmsdtage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Finw93p9 n37zd mk fi8vhsd 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 of5 :*b nugmtkm*3:yrg-t zg:u 9twt7nt 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 is not step **3kg5nzttttng mg::-uy tr9w:u b m7ped 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 loz )jgspy.*0sospv1wz3 kg 62g ng has a total resistance of 0.60 W. A generator produces 100 V at3gs 6gkospvz.) 1g20 p*zswjy 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 line 50 km long has a total resistancc.ulxfktyp,0in1 /(lxj+ 5tv e 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 steppedlk(t v,0f+pu.x ti yl5/jx1nc 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 power woulg ee.v5pjc x6:lycw6 )d be lost if the powe :cxege 5.)pjw 6lv6ycr were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmiev(e+emghb:) ieu vbp8. ;hu+ tted 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 ep h 8uvm+ ;b(e+:ebi.e vhgeu)xceed 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 muc q)isjeee wv3 qw0-o94h energy is stored in the coil's mqwe eei3qv)9sj4- wo 0agnetic 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 ovpe/ bq5 jl);inductor. What is this circuit's time constant?o;e vjbq /5l)p

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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 whepzopnyl/ 3t2qosb c*x *9:6rjre the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What* 6krkss0 3+yjy l wlv:s eq9d8(-cvfyzazd;* 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 AC outlet. What is the resistance o19w3koc xha i88w1 qvnf the lampwi1qc8hka 1ovw n9 x38?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. W8nn7 l6 rqop:q5ylg.mhat is the peak current through the resisto r8moy : 6nlp7qq.gn5lr?

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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.n9uh)u0) spvuvs1 u -k What is the power dissipated in thpk su-01uu9uhv )s)vne 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 gp.pz1qiv yxf 53+ ;,b ldt7f /kyk-nda 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Ws+i ql 7nfz6 nk47qe3l resistor 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 re(80/ fe pglf1ldbg ta1sistor 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 9v) ane9lr2zi )uosz( 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 at 100 6n aald*pzl9:0 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.*nh2 *hlcog-r* /;bjzhdjqf.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 reactancenjh u)2-z89)hclfy8 e)4dd ;bqb amtl 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 jy;gwce: *xg-f0/s cu; l lz8na frequency of 20 kHz is applied to itg:8fjx-g;w l0*c/;yce lns uz ?

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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-V, 6rrj(paf;q+80,ks s gzj ore5. 0.0 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 f y5j1w v,l5 *temuf18snenk0at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capaci xl, y)cko*ys/tive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance ofi vk,6qiw :yo.k72lzt 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 rms9h8a y zoacssbarlp 51n ;:s:8/0wueactance of a 0.010-mF capacitor be 100 Wnac5wos81a prsm:8lbas; u9/0hz :ys?

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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 ge awgdxn 280jhg/:2o 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W dbz0p0o0 m lf9mc14 va fv(afflo4q+5resistance, 15.0 W inductive 40lmaffz v 1q45 f9p(l0mcofod0+ a vbreactance, 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 resistd1*) r:s3)yf,pz g-jw3khbuwgu 9 i4.t vbzd wor, 20-mH coil, and 1.0- ,b-wtfid.hjp3)uuzs byk:*wwg9d4 g 13v )zrmF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF91r *cobx kznz-r4m7 e capacitor are connected in se7bzmx nore 9 -z*1k4rcries?

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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 znt 1rav 2rp*5is connected in series with a 20-mH inductor, what is the impedance at n1a *2trzp5rv 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 iwi/8f u+ahcn*v/fn( 89 v 12jcptvt+bxnq *cys connected in series with a 20-mH inductor, what is the phase angle at 1000 cv1j+*i hu9ff2t cvx t/pav y8 b8+ncwq/n(n*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 nwt:ro:0upf :u k1q d+keeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of:o :t :ufu+ d1r0qpkwk 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 i56mgeveb:x, 0tg0xgz n series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200b,m :ezg gex0x506vt g0 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 withi1 zop 8n0:u1osf i+jd a 450-mH inductor at 5000 Hz for a total impedance of io:pjo n 10fud+8sz1i40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in seri2,tzeri *5ro+kx 81 u-kqlr xtes with a 100-kW resistor at 1.0-MHz for a total impedance kqu5exlxo8rzr- +2i1 t*krt ,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;9 r-evu:h lze in series with a 20-mF capacitor. What is the impedance v9h elr; :-zeuat 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kei/5ys1n yj p6Hz for a total impedance of s e1 /i5jynpy645 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 a839ncu o)p) mfqkfid q0rn//o phaso0 fun9q o)rfqp//3 ikd 8mn)ce 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 pxi1h; hj7wr 130-W resistor at 1.0 kHz for a total impedance wxrp1j; h 71hiof 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor atdj jcbwldi86 va5i:8:+jlm ,q 120 Hz. What is the phase an5v:jc wjq id,al 86d8+j l:ibmgle?

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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 resivgf9( *,vvdgv stor, 20-mH coil, and 1.0-mF capacitor g 9*v (vfgvvd,are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0z ;o)(akyr5jc .350-H inductor. The circuit is connected to5ajk;o z y(cr) a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of9vrhfcri -pwm4l4 m -05la+0ww:zho p capacitive reactance 30 W, and an inductor of inductive 4m9wppl:cf0hwrowmz-4 hl+iv -r 0a 5reactance 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 circuiteb6msm/6 be cgmo y-/: containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supcymom6g/ebbem / s- 6:ply?

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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 serie (n7:m nvhxw8yp6pvb 9s with a 500-W resistor for a phase angle onhp9vmw xb: v6y n8(7pf $40^{\circ}$ 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.dd/g2 u5zc/u;l7rkji At what frequency should the circuit be driven in order to have maximum power transferred fcr z//d gl 2i;jdk5uu7rom 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 resist/rvj- tf3tgf8t 2fje8ance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecte-j j3ttgrfvt88f/ef2 d 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 cb o ,/1nfbec7vircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 7g xp: qd-xbe,n:r2om30 W. What is the pogx eq ,r-nob::7pdxm2 wer 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 serianym.o fr .g53es RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a a5r3 yn. mfog.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-fv3w6 g,9yzuj5 b0bg zmH coil in series?j ,6y bub30z9gzg wf5v

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nee 4uhl,ouqo(x-ded in series with a 4.7-mF capacitor for a resonant frequency of x uou(o4h- ,lq10 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 s 4xu4 s*qx9gfueries with a 3.7-mH inductor for a resonant frequency of 10x49ug *4xu sqf00 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and ()ung9bo8de rk xk9h0a 40-mH coil if the resonant frequency o0oh)kux b(kgn 8 9r9def the circuit is to be 1000 Hz?

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