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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 of magnetic flux kpuply*- sir ya( vdxvov,(587(ee 3n 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 vqb 2v(-gl-qj3aq2 b astates 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 oanjt8g d91m2tv 27yw cf wire in a coil produces what kind of change on the inducta 2y7 jcd1mnw8 gt92ved $emf$, 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 w3oj w ;hi+rm57mvma1 of wire produces what kind of change on the inducedh i;wm 5j +wv3m1r7oam $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the induhvw 1pn,d 46 hfhtz)q3wv: b7uhynb.* x, rvk9x b7u,hw )k z:qyb ,1 6hvprt3hdvnvwh*n9 f.4ced $emf$, 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 fiel/qals*vih17yl l -e- *;lqnmwd 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 direction3v r5kps jpi*, of an induced current in a conductor will be that which tends to pr3,i*5pspv rkj oduce 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 magn7 /bs j5a.uie9f lcc8det is held above its c9 c8s5jluficdb.e 7 a/enter with its north 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-geqw3+ 4:fbp gp.jrdn ug npp8e f1f+uvu)7). A bar magnet is held above its center w+wu7nbu g e ve8f)g pn1pdq+ff-4)g3pu:rjp.ith its north pole pointing 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 th;:0*r w ovsz68nhs)p4un. j)xesbem se magnetic field vector points straight up. The magnetic field vanishes* )m;b)4hsejsru.ps8 wen :sxoz 6n0v 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 level tabyz 36r:reqg c6le 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 induc 3:g6 ycqzrre6ed current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fieyf zp9 2leut.:ld points straight down. zt:y9ef.p2ul The magnetic field disappears 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 hore0 szuzz :a i:2qzhv*:izontal table and carries an ever-increasing current northward. Two coil20:z heasz*:ui zz:qvs of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enterinq (1 sfr si:gnbr4b72.yci6d xg first. As the north pole enters the wire, the induced current will s ryncb:xbqs6 ig2 r 47.f1di(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 con*sf, khfcq hm*1y+bax4 : td iog2.p1nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be theip y**h2q xbko: h,mf 1a1tf4c.gsd+n orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoj 6c(dknnax d8lsi 9.3se direction can be varied. In a region where a uniform magn d8salxk9 jni (63d.cnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.g( l(ap /1q0flr ;0rabdt4mv*(ajhdj
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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 an v bjj)/n 8pp* j*(tqin$emf$ 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. The 1. wieq o9;/ru9ru mtz$emf$ 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-west direction) is moved norpb;gqx2jkce. 5q0s1 zthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential bq01c .g sx5 ;pqe2jzkinduced 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 kah sydnv6 r.p)j7v,/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 generatocva1)o ) o s/1xpuf1dm,w 6atgr transforms

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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 seconmx-tfe* q, .lk-xfv 1ld. The frequency of the1- kxtf*q, -flmlxev. $emf$ 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 devic(or/*)4bkcwjbgz,a nspfqq(xgen 0) y 28+v fe used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device ,sx 64) 3uq dh:pjnpfethat

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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 loops than the primary ct;j -kld c*d+ffkk4j ;(t c8fwoil thek8 wc fjjfktkld(tdcf;+ *; -4n it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the sew. h mi-w)i2yecondary coil then it ii.yiw )2ehw-m s 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 inp v60 0b*+gbidsbm ,bexut

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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 circyp e1e7t(ildgy(, z 1ruit,

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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 battee1qyatjo-wtr7/guj+ j/v *v ,ry of constant terminal voltage.1jetj-* tvr,gj a/y 7uv+qow/ At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of con)bh+ux +gjgvvbnnu 3p:o x1(/stant terminal voljx3u xvgbug:b +n1 n/v+()ph otage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an q0cid zx bo08)lj3,lu$emf$. 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 cb n p(p1hiko7q-m5.y)0uymoi onnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bs03dshe aco7rj nseb(89c 3u1attery. The time constant for the circuit rep o1ca3her0 8(j7bs39du cnes sresents 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 s8iourf d/(n, wgg,8kq eries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit rg ,k8qfr/ wi ugdo(8n,epresents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have ts0z783 xraf5jq 0v ozhhe 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 this circuit, the c3hnmml6 v8ylvrh f5 //:df6/ sq(fwpiurrent

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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 jm9p 03u7liv nsupply. In this circuit, the current lju m970vin3p

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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 j8qk tt7 r/v*1 cnr*ipac circuit changes by what factor when the frequencyqj *i1cpk8n 7*tr rv/t 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 doublarci441mba..1 o brclf,ry1ped, the inductive reac rbcpyab4,fci.rlr . 1m1 4ao1tance 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:ibd 72dw z og*fg)v;+a ua,)esmc+w c approaches zero, the inductive ,g7bcd)df+)o*w ca aum+;v:segz iw2 reactance of 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 an AC powb.m:vh5sw ghr2 -cf5 gzqr :m/er supply. In this circuit, the currentq5 rvg2 ::.gsc-mh/w mhrz5 fb

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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 tha7u74 p+s- w-hjp5ppyd9 ddqme frequency is9jpad dwqp pp+7-ysm5h4 7ud - 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 approachesq 77( ipckaytx(5km3 m zero, the capacitiv x(k7 kpi7y(tcmm 53qae reactance of 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 betweerbdi:*dv) t7-ipme4 (1bo u swn the voltages of the inductor and capacitor in a RLC seri-)b*dei uo 4 (dpwr1tbmiv:7 ses 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 defined - kzx1 0 xp cs.)c3mwr+4eeozkurs(j4as $\cos M = R/Z$, 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. /e,c +pqgp2js / +qsjp,pc2eg When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the cirnm45rn 5idx ;lcuit 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. - ) xtz1mycflg3 lps64 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 series circuit, thz5h 2w.fv2r9mt u+ gwie resonant frequency of that circui2g2 zrw.mv9 wu +if5tht 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 r.s yk/ydi4+gs+ kk-lyesonance,

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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 occur3ltc7lt-h m 9ts when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field lp6m4eh1*fz2x,sro m ,-n mqnof 0.20 T. Find the magnetic flux through the loop when the plane of the loop amf,2 *l sho zqr6mpemn,1n4- xnd 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 rotating in6yd)hzdw+p b* 7ssc) f a uniform magnetic field of 0.20 T. Find the magnetic flux throws* ys+b)7c)pddhfz 6ugh 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 rf0)yphwby-f8dq z2aeta8 b :7otating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of :0 by-f wy82a qtpze)8adb7 fhthe 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 loop ad4+t63dj v;t j6 gecsis 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 ckh)+r,xsie8 k8o0yp /wh )c xzoil 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 witm22(c0 cofmx eh 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to thecc2 mx0f2o e(m plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15c2yioeh* ahzxk16h / l;lk8,i turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area .e h45owb rndmdc*:q5$0.20 \; m^{2}$ 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 gu:2s70ebo pv a location where the downward component 27guobv:p0s eof 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 that is 2.0 m long rotates at a u/ pc bzxh21(rhku 7n6constant angular velocity of 2.0c6bh 1pk2n(/u ru7hxz rad/s about a vertical axis through 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 has 50 loops and a cross-sectional arealf8s6yb0xu2pb15 an y 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,e ni/ib/a0 qk 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on ik6ihn(z47q7npop tf -ts armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltag6 t47pq h nzon(-ip7kfe 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 consist1bu 1ld9nh;fy 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 consi )ocs5/p-dh0qu4kd aiatg), truct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A0h, a-giu)d i ad c45pqtk/)os 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 generatogxbdd )qo5* hzahd6 w4 -2y/rhr 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 resistance of 6.00 W. The k,yk (fenm2k 0motor 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 ondnm,o c2:t5ff 6.00 W. The motor operates on 120 V AC, and when running at full speed mct,no f:2 5dnit 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 re m)s: 7syh4toq09x kehb (iuf4sistance 6.0 W is connected to a 24-V power supply. The operating currentt4:)hmio0e(qx7k49 yuhb sf s is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supp6ay,8:bw t rly:h4x tmly. The operating current is 1.0 A at full speedt:b6,8yw hxyam rtl 4:. 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 coq8*)-/3dyjvolr efl rnnected to a 24-V power supply. The operating current is 1.0 A at full speed. What )-dyer/ f 3lorqjl*8 vis 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 nenduh n ,/k;000 tsm5 hyn)vpgzeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in tdyhd wz*+q2 1che secondary. + wy2 dd*hc1qzHow 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 primary if t 8r 6btfub21t.xiu m+jm ky9j.he 24-V seco 6.j 19m8bt ji k.+bfumrxt2yundary 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 kwwz-zdi*1:cb ;cmjq )z z f((coil and a 2000-turn secondary coil. If the current in the secondary is*cwjzbw-i(z( c dz1 fq;:km z) 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 tu(ww h..g4dlj dlh1. s mo)v .jr+s8zlransformer. Assuming 100% efficiency, how many amps ao (u.gl184 hr+mdw .jz.jwvsd shl l).t 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 transformer provi.3tre cb;5inzkbkf -j0lgg8* des 7500 V at 10.0 mA. The primary coil operates on 120 V. What doe-5z.tjrkn fg ;*e8 b b0licgk3s 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 tur8k6ph4 o 6fy1 +;5 chqhx+wz5k (kx,ix rlelxans on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applie+rh;xh61kky(x6 8lkp 5h wx 5i+efl ,zac4oxqd to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 tuwkr0+h1 7+ifdr-;6ep- bv w7 nxkx lzprns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarrk- n d+xxh r0ifzve p b;7w-w1lk+76py, 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. turf6d7 5 vzl nny)5*wIf the input current at the primary is 100 A, we can expect the output current at the d yt55 *z 7n)vlnr6ufwsecondary 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 ldgxe qbu/an2/8 ,8upsr v-+z and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bed , rnqgzl-2 s+8/8evux up/ab

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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. fzbkdndli *b6d3 it42w8s7r 0 If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictiondi n *kt0 347swbzfb2 i8d6lrdal 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 vz-fd5s2e 22by3ij+ mu;po nf 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 number of tury jifz2- +3fun5b2s;ve2o dpmns 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 voltageoispb6;d1c)ih.cg j 2sj:2 qe is usually stepped up to 4500 V by a transformer and transmitted tho qe6i2sh dcsb. 1pi2;j gj:)crough 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 603w83bmqd : m w5txwwy( A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lint(wq xm38www3ydb: m5e of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long *q0+7lmnjl9qz-svd m has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transfor97ns 0md-*z+qqlvlj mmer 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 linr h3ob qy(/m /i9y9wsre 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 with a turns ratio of 100:1. What percentage of the original ener 3b9io(yy hsr/m 9/wqrgy 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. rs cs w,3z9w5so 3ugn dbs;u9,How much less power would be lost if the pobugud995o3s , 3scn;sz w,wsrwer 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 transmitts8.r1ljc2 1g-8q hy )ktxgmw sed on a line with resistanw)ks81 q2x gj1 lt .cyhsm8-grce 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 exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much enel ( njzc9*mt tlnd,*:crgy is stored in the coil's magnetic field 9c(jd*n:ltl *n,zmtc?

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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 andt.fb7u fn 8wm1gu b1oaenb74d1*bbk) an 18-H inductor. What is this circuit's time constg7fa t m71wub bf4kbe1ub*n8b 1).nod ant?

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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 whe ;orzjui:.n k1a )-opure 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 sjq: otu6d -qvld+f+0 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 ti 5) wk98iz 7zx:jovzfhe resistance of the lamx 9 fz5ozii:)v7jz8 wkp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cur6thfc( f3h6q zre6(h6 hzqtc3 ffnt through 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 a5kw oow9 m,osxi(a00 to a 120-V ac power supply. What is the power dissipatwkao5i,(9x maw0 0os oed 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 red9 zhq6xaexp l3 a(0)qsistor 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 resistoni3tjq1u5is /r 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 resah3zc f-4 wb8dg k4ys+4jh0 o) wcwww)istor 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 1dtvs3b x4;3w/u8x5u j 9prlpt.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 coilx, dow-ortxp88 o p5 *qirs06g at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will)+1 * qm3 lmw7szsekgxl4-o tq 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 at 100lv p4hdvi73n-qap4 6n 0 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 ACa2opg g2 ;v;gdh(wpl7 at a frequency of 20 kHz is applig( ;h;oldgg7 pa2v wp2ed 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-V, 60.0 Hz sourvsh sq(2re gje.-s y16ce?

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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 adffche7l:vd8j *znq :-cf) x5t 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 c n4.tzpiy qt);lsn++r apacitive 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 cap*dzwnr 6p ;cyu:xk,7pacitor have 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 capaciky b+bd)vy(;m+1ylzg tive reactance of a 0.010-mF capacitor be 100 W?bm ;+g1+dzyv yyl()k b

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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-m 4 1dfu1zvxu5rF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance -l pr */8 )qh;c: lm9tz7w v rg*,k3tsahrobobof an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capa;rqa/ hg)*,- h7b rkl8rwcpo tolzv *:bm3s9 tcitive 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 qg5x 3 qv;ff.42szm 7joyzhn :at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in syf4fn 2gx.zj mv;s5hzq 3 o7q:eries?

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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 h( d* 8q um;8n4 jq-hcraoztp+1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor p; ca4(oqjqtn zud*r mh+8- 8hare 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 indufsu/4ayp xv2+ ctor, what is the impeda2 pyx+/fuvs4 ance 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 inductor, wh .8e3r5xrgvqfat is the phase angle at 1000 Hz?3vfe rq.85 gxr

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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 ci.q c y-,ohrir0fop9 a-rcuit with a 20-mH coil and 1.0-mF capacitor for a total impp.a9o-i0 y, qc- rfohredance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resnpg+h p4,dki*c c y) o/vuq,r4istor and 15-mH coil to get a total impedckci)p/ ur g+,q4*pdonh ,4vyance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a tovp 5t bf)rf m5nd2 c9mn4z;h-btal impedance of 40d tm4 ;)ch -vbmn5r 2z9bfnp5f000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1s6vj 22ywrc m+.0-MHz for a total cvw6s2rjy+m2 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 with qecx+h n fo)-c*z *8wva 20-mF capacitor. What is the impedance at 1000zcq)fvo-exn + 8w *h*c Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a tlb4b w0bo vg46,:rnx6fwp *ux otal imped b0bp*46b6ug, xwl4noxrf w v:ance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capjlbyr6- ) . 4rkviu)whacitor at 1.0 kHz for a phase angle of -rul))i 6.4w ykvhjbr$40^{\circ}$?

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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 s q6+3mhi 918jqd2(uq omhrjru eries with a 30-W resistor at 1.0 kHz for a total impedaq8 h6mjmoi39huqr 2jqud+1 r(nce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What5; e(rwy1xw i du.z30tm did-m is the phase angmetdx izr0di3-1 ;d(5 muwy.wle?

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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 c2kd82roj-s yand 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in -scjk d2o2yr 8series?

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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 o+hsunnrn c, 5jad f bxi4;;;qd;4tu3 ef a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. Then b 34s hn, e qicrdn5;+;x;;4tuujdfa circuit is connected to 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 of capa1: ogu18tk;plgh;m6 6loeihdcitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What curren ktooi1ugl;gep;h: 81ml h6d6 t 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 gmgpvs+ 4;xaf;o:z uec52wt d f8*9cfresistor, a 10 w+;8tfm2d4c9z efv gx;5ou gfapsc: *-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase akdw9g n .r fjqhmb/eggz86/e3+ )z zi8ngle o.jk68ggb3) zinh zr8+q/ m /9ged efzwf $40^{\circ}$ 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 what frequenvs*y-qia l*g.h3kq8lj.0 zgg cy should the circuit be driven in order to have maximum power transferred from the dr8-.qi*lkgz* hs0yl a q v3g.gjiving 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 wia(l5)bl/ooz9r f nvd t40w3dnvrw28 oth 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, vt o ob2f0 /(4z5l3vwlr andnr wd)89owhen 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 circuit3 olchzpn+hd.170aha 5r*vit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What t48p),prv,q yg row3x is the power factgtoq4v)wryx83,, p rp or?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing ig0 6oq /y4lr*e;melx a 50-W resistor, a 10-mF capacitor, and a 0. mgyrl;6 /*4qeio x0el45-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 15k) r qfbf(wg )xb)l7;n/3mndx-mH coil in series?)n)qkn 73/(blgfbw xrd)fm;x

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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 aoo;b-wz93jg+ s7s+,yy jnxxnbz6 ,h o 4.7-mF capacitor for a resonant frequency of ++,-x z3oobsy ;s x j6bzjn7ng y9h,ow10 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 freq;4-lup 5fy rfhuenc5f ;- ul4fpyrhy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor 8upt bjgt :rm)c5u d,:-njc)yand a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hzu8rt)md u),jgbn-5ytpj:cc : ?

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