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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 exaofgr *n(g ;487djs /waym 0uvcept

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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 indu 1qu -zf slf7n wy:*t,l:26qyvbtnox3 ction 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 lic b9uio03 v-loops of wire in a coil produces what kind of change on the induced v cl-3o9i0bu i$emf$, 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 of wire produrpc6i g:t6dn5ces what ki6dr :pgitc5 n6nd of 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 produces what kind of change on t2i( z, wh2paj0xdibu:he indu2i :w apzd 2hjx,0iu(bced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field a)l g355fsp ghva;nrv*n $emf$ 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 conductobv;s g4zu;q 6fyj53t tr will begj56 t 4fuz; v;s3tyqb that which tends to produce 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:) m(tihhr 6aq6jky y+ above its center with its north pole pointing i)ht:q6km+(h6 ayjrydown. 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 t :pgo8pz9(k3ajs zpuq:pzwi1m9h y 1 ,able. A bar magnet is held above its center with its north powyz(hgq9iza mujp:ko p 8p :1pz319 ,sle 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 the magn ,d*)emmh c kx1+fgam:etic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced c m*+:m gm 1f)hkxe,dcaurrent in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field xeo*n s09-)7 ub ldkelvector 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 the field )l7s9bdnekox lu *e0- 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 *7:st b 2i/m ppd6gzq;: rahlnfield points straight down. The magnetic field disappears suddenly. W;*idhaqr6 s:2 gmtzp:p/7l nb hen viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an h5a(sq/31kf+uvxc we ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed asxv3q/1w (f c+keuh5 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 enta1epf3zm .w 5tuv: kr/ering first. As the north pole enterszf w:vu m/ret3ak1p.5 the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axisck)rt s++10qkstu z /v whose direction can be varied. In a region where a uniform magnetic field points straight down, what must btu/r+ kvsk1c+s 0zq )te the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at consta9n 3dw3yp*jn ont angular speed about an axis whose direction can be varied. In a region where a uniform magnjwnopy *3d 93netic 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.xo4 z2hg0vsl:
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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 tph,brtq f6urrxx)cj, 1vql6wb977 8uhat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field.8* *md5hzs fql 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 (orier).-ug vkz *zonted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statem)- *zzrgk.vuoent concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular vel; mr5d mzk,v+kocity $\omega$ 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 transforbva5xw w7.pgd 4cb da3 g3*fc.ms

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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 frec7 uleguxo6rv o+gs5(.p7 4ayquency of th+s4 cag 6y 7(regux7pul.voo5e $emf$ 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 used tow:* jl kkq 8u-6hhat;i

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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 uqcx uf+r 41kez ;.:vfthat

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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 conedih2/h*wwje;m eym7i z5 9r g9 d6pb1tains more loops than the primary coilbe* e1 rw/ mm26hi gjz;dy9h p5iw9e7d 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 primary coil containsqq4tfcfy7(9f oew6jn n )/sht v1, p9s more loops than the secondary coil then it if n)/ ft1ofsh97c(spyt e9n,q4vwjq6 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 inpn 148;swkci tput

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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 circuizx.x,( i8petq6 5fuc dt,

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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 y j amp/ hx;,otr2,(r(t x)ybaconnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor isttr, / ;o xj y(,amyp)(2xrhab

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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 ajl9lq7ze/v:-gkhd ; fx(n m74k 8 jarsn ideal battery of constant terminal voltage. At the mom j8l;km7v -7:aj k4lrdn9fge/hz (qxsent 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 ind-zvo)cx2o4tgk , 9nyquctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resiszw6qx 7vemx5nku.m4 n9i 5d;itance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The tie v:-f r*et;n mxp0jv9me constant for the circuit represents the time reqe0 vrn xep:j-m;*ft v9uired 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 aufbtpb0ym):/p 2axb) re connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents thfpb) y20:bxm) ta bpu/e 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 ty j1ipv126l hihe 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. 7w5-gsb oh j)be6hs0hOn 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 connec9loo-jqpx k1*ted to an AC power supply. In this circuit, the currentjo9xqp - *ko1l

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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 when the f; hz3ky)+ abrorequency is tripl3zh;+b oa ryk)ed?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, th 7*bzu a82 /m r1izv6uxrlibh.e inductive reactance of that inductvb 76bir8zax z*/lm.1iuh2r uor

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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 voltage32 1tytpy(aa5sv)uov5 . uscg across an inductor approaches zero, the inductive reactancepavt2.3s51( u)gutyv5csy a o 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 power supply. In this circuit, thez6j efx*1a ng. qjef12 curre2 z .jaxgefeq1*jf1n6nt

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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;q u4ek bjoiqv5,pkt;: c -ld; by what factor when the frequency is tkqck;4;:d l;i e,-qvt bujp 5oripled?

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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 capacit5 *zgsvo8f3 kq n*(-tdx h6cb2jr ,opqor approaches zero, the capacitive rtq( r gjh82s *x, q*b-npvko c53f6zodeactance 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 between the voltages of the inductor and capacitor in awdz ys6 k+9h r*g,izl-m2a.lt RLC seriesgz2ly6 k+ rw.t di9ls,azm- h* 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 c; xr -7w+ngdduva8*2 )eawlz xircuit 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 impeucfdl:bq)0;j dance of the circuit increases if R increases. When is this stateb0l u;jdqcf):ment true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases lv7) 9hqbgygh q4( dzh75 gi9gif $X_L$ 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 impeda. (e-go(a ldpjb3j3h wnce 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 duy-fw3 vw7 t3wouble in an LRC series circuit, the resonant frw wuw3 -vt73yfequency 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 volt :no tn(ysjn g.fos.k**kbg4 9age. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLCa73th*ght f 8)q2 sq *1xqngkb 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.mi8k5pfpd0 :gv zb5f in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when 5dpv.0g8 z fbfkim:5pthe 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 r i9t (,z1 n-zi8f;bt)wv zi )gog2nvwjadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throuv gw tv2g)w1iit n(zj;)z,ib9 fzn-8ogh 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 rotatinga, ;qcq(1ouc1 *xicx yzq9t2o in a uniform magnetic field of 0.20 T.,ztq*y ;1x1u (9c coaixq2ocq 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 area of an adjustab vr.mikh ,zud+3*q e9ble 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 dq u0k tetu5i,19vb6jfrom $4.0 \times 10^{-5} \; Wb$ 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 s21(lwa/ei xe wides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fielew2 /1xl(ewia d 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 15 turns and an areav3b;vyd g+/uw1t*;mw0 v swk +vyra.m 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 i pf0sx9jih :dc c)m1.rn:l4 earea $0.20 \; m^{2}$ 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 location wher4w;sbkvoza;u 2 );tjde the downward cktv ;)2;;ub djows4a zomponent 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 that is 2.0 m lor0 9ykj:7 rrv 8odtn8v8:u wqung rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant dvrq9 o::u8wy8rrkv n8utj70 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 )x 1x 7ubjf2, vun*jxyox96y74 kspvjand 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 turnuq(sf; l7rao p4(uitjz2)j0jkz;xq; s of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Eanm svsei lt- r62wc5s1k.u;.lch 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 voltage of thu 1stl; se nsm6k.2.ric-lw5vis 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 o90 8shc(j1n so;op),l4sf*xomjb1 jxe i/f uwire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple o;nskb4g+;i ( zj6dxe AC generator with an output of 12 V maximum when rotanzbjs(i x;g;kd+4 e 6oted 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 generator with a mh8 9gk43(pwhtmsny w)0gmi5g:9c swcaximum $emf$ 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 motor e( ; tix)uu fr)9bw;-+ez qamuoperates 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 operates on 1x6 .v7s*7kj dl3sail o20 V AC, and when running at full speed it generates a ba6 7v3.koja *l dxlsi7sck $emf$ 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 zg )w88wv3lyu to a 24-V power supply. The operating current is 1.0 A. What is the start-up currentlvw388gzw uy )?

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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 internajr71;v,ee1l:t gxv eyl resistance 6.0 W is connected to a 24-V power supply. The operatinj eg:rxe ;,e 7vltv11yg current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectedor35 j6gse41bb;e; lpzv m7lc to a 24-V power supply. The operatingeebj7 b;v 6pg o45;3mzsr1cll 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 reduov7 sgdhp2y-t ya0e+* ce 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 thefd h5 zl,9 qmw-qht-od 800gkh secondary. How many turns dmohl50-hf w-zk 0hq ,g9qt8dare 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 thezyl9b86g 6zy/*6ivd *uchls( isk. qp 24-V secondary has 100 qy l6k vzugb*. i/6pi( ysch 986zl*sdturns?

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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 500as0wng qq86*mwsvu 3y7zg0 h.-turn primary coil and a 2000-turn secondary coil.0h 3 wv.m s8qa7sgnuqy*0w gz6 If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in aq4h5-h m o(8revb+4 or.ysb athe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in thq4+ayor ab8m-h4h 5(e.bvsore 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 sio:26o )j nonf0e2o;qfn.w s bdgn transformer provides 7500 V at 10.0 mA. The primary coil operates on 12; bdo0qn2)oe fo nf. jon:62ws0 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns4wg ktjisvs*;n.qxp 3q2 q-p 7 on its secondary coil. If 120 V at 2.0 A is applied to thnpi qj 2s w*sg.ptvx qqk347-;e primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300pu -,wnyo a.k ;ghl(.n turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what n,k;w(-.lay h un.gpo 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 1g, (uss:ron vq /so36c6z ho)m,a+ ren00 turns and its secondary has 200 turns. If the input current at the primary is 100/sr,h +g3zsuo n) ome csq(anv, :or66 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 c:9(f wt(3w 3bkmqlzt)r goqh * q*5zn100 turns and its secondary has 200 turns. If the input gf5w* (3nw tqqrk 9 z*:mtlo(qh3z b)cvoltage to the primary 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 l,5j2g s1oyi i100 turns and its secondary has 200 turns. If the power input to the primary is 10yj ,1g5li2soi 0 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The volta mc6)r5sqz 2arge is usually stepped up to 4500 V by a t6 rrca)5zq s2mransformer 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 curren 3ylsukg6-ri2c5t 27foc tuwv1j+g.vt 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. F-tgw 26ucovl7s5 ikvc. 2y r jfut13g+ind 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 j -8(tnbf j+bacurrent 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 steppfb jbj-8at( +ned up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total rafwr;ylo)n8ne 0hx5;s 0iac ,vh q-d+esistance 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 qa; +5 8fr hdlxn evh-nsy0;ciow0)a ,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 resistance of 0.60 W. A ge(n)a l 8psf,aanerator 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 asan )a(fpl, 8energy 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 transmitte0n6n 2cr o3ofod down a 6-W line at 1000 V. How much less power would be lo3n0rc onof62 ost if the power 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 transmitted on v: s yjl:d*q:ua line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power lvu yql:::d* sjoss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored inx( c9k)l)q 6vl0q) nwe jdisv)rbi v14 the coil's magnetic field?4)qv)cjxwervl6biv)kl d1s09q () ni

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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 )k6c qz7h ;yueg43drf1nxk 6aresistor and an 18-H inductor. What is this circuit 4erh;kc6d)13z7n fgyu a6kxq's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where th9d-frli; xp .0k.)lwj d zbhs7e 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 5 yx4pnoc +r+mis 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 resistar9obpqs2csup9(s p4c599b)2li rpb * j 1i wvonce of the la2bb5p9wsv u4*sp col9 ciorij)rp(bq1s9 92pmp?

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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 supt*rp( *q :(f+fgskw +y;0pyreoykhj2ply. What is the peak current through the resikrskw qh 2*tjypo(:+p fy 0efyg(*+r;stor?

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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. What is the power 86. h2:eybe+vplms3 y zyoh mv0tbl-r2 ta-a: dissipated in the resistor6y b 8lthp-2y.zhym:3voe+-ms:vte0b a2 ra l?

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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 /yqjg /rkuxzdtf4a19 l/m .*zresistor 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 resistor is ,t .-e4 hauml3jxb53 hcw.4 y xqu3efhtqg01 v$I = 0.80 \sin (240 t)$. 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 resistor isz1ts ci t*f0u)f(os k. $I = 0.80 \sin (240 t)$. 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 o cijh+oi,ix6g1 hg7,1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hz?9e kvas )ug*rj13h4l a

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive re.x eoiairk(f vn+.t 2go5z d-v3ac7n1actance?

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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 i r(ot)ejr )f)reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH induck 1dhgpjvpv 2q0-;.lhtor when 120 V AC at a frequency of 20 kHz is applied tvl.v-2jhp1k hd0pq ;go 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 110k o(qw5 q(lg,kda0mek8a7z1y -V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kH:h:tc)fno6h( ilfxzq 0+ed a6z?

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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 capacitiz gg2k+e tmuk 5p m2wb/h*d3w v)n:*uyve 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 rnhmp:(g4h z9seactance 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 0ag ozib.4 * /7cuwd4sj.010-mF capacitor be 100 Wza47sb.4gc d* iwouj/?

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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 capacito 0e6 heqif1edqq9s-) gr at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 cx, e x4b::qbnt)b 0uiW resistance, 15.0 W inductive re ,tuqi)bc xe:bb0n x4:actance, 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 i4o+-gl;ptgp/gm0vi -.fqu ro f a 100-W resistor, 20-mH coil, and 1.0-mF capacitgfvro0 g-.g4t/li-u+ q;m o ppor 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-mFq dv,bxz +9dlo859lmb coz ,lb99ldx8v+mq5 bdapacitor 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 wit;m4*cgxl m e;nh a 20-mH inductor, what is the impedance at 1000 Hz?c l*gne mmx;4;

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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 i ;i(ryxz-.hlf n series with a 20-mH inductor, what is the phase angle.f(hl- r yx;zi at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed ;p6s op emg7fx3gukn68u4xa/y(j3p g in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impeda(/ p6ne 8ug73 gpj u;3afsxpx46kgm oynce 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 capacittfbzc,w85 85pqzs 7tyt:t ga6 ances is needed in series with a 100-W resistor and 15-mH coil to get a total :5yt c58 gs7wq8,6z zt tfabtpimpedance 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-mcp3 n*v;gx6q jf(d:b jH inductor at 5000 Hz for a total impedance of 40000 W?bn6f:jvp*qxj(;d g3 c

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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 seri5*bpz2j2lb hp*b-ovfgd 1n3 oes with a 100-kW resistor at 1.0-MHz for a tofj5 2b v b3h-*lnbo g2o1pzp*dtal 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 wita2m:c -r,ebos h a 20-mF capacitor. What is the impedance at 1000 Hzm-r2be, os:ca ?

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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 tqkeav0* jj4u -otal imped0kuqva*4jej- 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 capacitorrbuskp-2x a )hj2r,y + at 1.0 kHz for a phase x,aj)2su +p2-yrbhkr angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistoj:hci7w43bgo wk 6ld0 r at 1.0 kHz for a total im:cokj4bl3 i gw 6whd70pedance 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 ej yy8vgd yia/ 8-pvd,)58ntsq5izs9at 120 Hz. What is the phase angle? 5yv8pqddn j8a9ie g v/,s8yt5i) -yzs

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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-rg56v :vamlr 1kpp(,kmH coil, and 1.0-mF capacitor are connected in serv65kg, akpr1r lp v(:mies?

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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 ca9s5 lmceefxo 65p s;l-pacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cur; mo6-9ps e 5x5ecfllsrent 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 capacitive reactance 30 W, and an igumjkf18b4yj):h 9 i q.vjqt:nductor of indu g1jiy h. )kb:jjv489utfq:mqctive reactance 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 sy;pub v9 f;u2q/m6rydjd 0k7 reries RLC circuit containing a 50-W resistor, a 10;myd brk20yf 9 druv7 6pq;/ju-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 ser:4 aqf/ m5otrgies with a 500-W resistor for a phase angle o5m/gta:f roq4f $40^{\circ}$ 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 = nw7:iqi7mzjo;c dt:722kcw pb29dko 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transfwp qzmtnii2ok7ow27dk:;2 79dj cb c:erred 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 r gm(qw-jczu5n 1 6qvq ecd-31*hur +nac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacit+nq c61n( 3mu hu jwz5r-erd g1qcq-*vive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an ACthyfw e *tpt7 r:c-4xq5v;wl6 circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit hak )4ghlz xtv1,s an impedance of 60 W and a resistance of 30 W. What is the pl4kv ),zg1xht ower factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing k u.p94ixta h ;gt/ek4a 50-W resistor, a 10-mF capacitor, andtk9 ;4ht.x/aki g4upe a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil i s9kik 5glxoc:75wb 8 lplw)g2 /yt9oun series? 7/9lkl o:lgbk owi)582xy9pgc w ts5u

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neede: /,y0el8hfv0 ) b:qzok sixzgd in series with a 4.7-mF capacitor for a resonant frequency of 10 bg/i,q zh)ez0o08 yksvf: xl :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 inductd5weh/-di 9ifor for a resonant frequency /5hfd iw-eid9 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 withh iz64:yevqllf4c9v, a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 100vzhv ,49f:6 4e qyclli0 Hz?

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