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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 excepas ;,8eojo,du-xrf8fpp( 4f gt

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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 indujb9,g p:7fphobkt y ;pg)zf), h,p+akction 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 what kind of change o*g,dh8h1fz d fn the i1g , h*fdh8zfdnduced $emf$, 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 pro7u*6nv r 9+-n ;ym kr*i)detuxdmdw,jduces what kind of change on the inducetd n;e,ui9mdd7 m*y+)*r6 xw nu-vj krd $emf$, 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 l*md nrdi/ s0 49a9 bgvf )obecm+(/fljoop of wire produces what kind of change on the induc m9s0 f( gacl+i9dmojben)bv /rd* f/4ed $emf$, 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)gbxugcou i5m8 faevy4/+2 z+ from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced currenx2ew omdkr6p+k; m8whg*vav.)1l. x ct in a conductor will be that which tends to produce which of the following effect6a)rwh8wxkcod 12g.m; vlkex*+ mpv .s?

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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 horgo67xj;z g m8yizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewggz;6 xyjm o78ed 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 /i-uxziaf0cu7 u vcpd/1*jcm7g 7tj, horizontal table. A bar magnet is held above its center ,c7/djv7mugci t1 -j cux/z u*i0af7pwith 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 the magnetic fielrq6 .cefn- 06 *jpd uz/vzyv9bd vector points straight uupvzv drnye9-./b* 60j fzcq6p. The magnetic field 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 level table top in a re,rf6x 9v f.iabgion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whe9v ia6f.,xbr fn viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magne 2j.1czpx p+altic field points strc.lp+2jzp1 xaaight down. 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 horizontal table and carries *hld0anu3lk7umm h:5 tmt2v 5an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced c57t hmu2:n53lhu0 *tl dmkamvurrent 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 witdim dv8 2us3+k4t km)dh the north pole entering first. As the north pole enters the wire, the induced curretsdk v md+md4i8u)32knt 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 angularx h1;vz4 yrp w qu-kjloz/-m(1 speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be thm;zrwqx vyo1/p-kuz-h4 lj1 (e 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 andx l4 ocrgt7*ai8po :jj9tlkl6k-s,/ gular speed about an axis whose direction can be varied. In a region where a uniformk 4sl,8i9lr /kj 6t togj7-o:lxca*dp magnetic 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.f;oomws-s)wg4u 0h7u
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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 tha (kf tdcz) o9xn0zp2:kt 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 magnetiz2wf9 (alf+ lic 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-west dire 0 sndo:hxf64sction) is moved northward at constant velo sd64xf0:o snhcity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal b4 b(s0l m/xq6 p-swg*sgh :pdmar rotates at 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 trt;cov 4tp/zf;ansforms

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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 revolution0wch,j .zu9estb7eg(ri f )t/ s each second. The frequency of the 0)(t.u grhite7b9 , cewfj s/z$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a d.o8m5/ pqhhgwwax 1u;1mji (do/ uku9evice 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,q2 mm4s; )ql(t yyapc that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops oe-lmj g: -r7k;vhnh6p n,:vkthan the primary coil then mn:ov rh6--;,7 pgen :vhk kjlit 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 cono7b-( 7c lf l(:mugur7m*yxrotains more loops than the secondary coil then itrl g(*c7omumu(ly :x7fbo r7- 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 inee) 4g-vn4d8 qb ctn, vbzh4w fdf:4,m0zuye ;put

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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 circuit4f1z1( egi-ib di jy:j,

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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 a x4gxz/kqf3w f;:x lf7re connected in series to an ideal battery of constant terminal voltage. At the moment contact is made w/ f47 lxq f3gzxk:wxf;ith 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 arim/q5ny :z a( pq.oia+e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage a/ zaqim5ai.:+( oqpnycross 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 connecte 0o7+bs )vjnjfd 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 w wr.i3*k yb+ean $emf$. 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 lvw5( 3/jy+ gmzq;d qkyd-. pptime constant for the circuit represents the time required for the current to rpp5.g3ywky qjzq-l(/md+ ; vdeach

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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 bat r spbf+;j(w- h;r)azmtery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requiredr ;j-afr+b wshm ()z;p 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 2 a,6oh odaptquf8235t z5 (nhn+zqowthe 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. qopyhj 5;-((egenxg.q6 qkg)mdx, :bx1tc 4s 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 supply. In w + nji;jhch.;this circuit, the curren .n+jij;cwh ;ht

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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)fqacn e/3-dlx+loo25 l h2mlx3 f z5q by what factor when the frequency is trip z 3q/eml)lxd5n3-q5foo 2 xlfhc2+alled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the induyg ks:p22a8 s)bzt4 j e:6zfgbctive reactance jetb6f):ggpsz8yz 2b a2 ks4: 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 a2hi q m.6f:sjocross an inductor approaches zero, the inductive reactance of tho msq 62fj:i.hat 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, the cm t+nw7v84 oauurrent ouwv8natm4+7

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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 factor0tpinh;bo;1d p8 ce( l when the frequen pinte;;10dpc 8bho(l cy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capaci* zgfa3 9g*ibe4 +4)mmlgp+6 iltcs vntor approaches zero, the capacitive reactance of tb4tz)gsmgv6+ae ncp i *f3im 4l9l *+ghat 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 indu 1s0 ig3pf /nfow y0urgi-51tc.,t q bwf-k*knctor and capacitor in a RL0kryn *fg5w3cqb iu, pf1in t-/. swkft-1o0g C series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined e lt09a e46m9f8lapmkas $\cos M = R/Z$, 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 iv/d-v.hlz d: 35g lp;ntcg1sqmpedance of the circuit increases if R increases. Whedvchgpn:.gs5 -lz vq/; l1dt3n 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 circuit inc h43r kwgf,8t x3skap8reases 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 cvkfc;f j7a: -i;77wp o3weiwtircuit. 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 dcdijmp(,o9(u m/-ew g ouble in an LRC series circuit, the resonant fo p m,wcmje( 9du-(/igrequency 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 voltageyw ldu a8w41aduk+t dyf43b /8. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit oc,ztin.4yg r/ gcurs 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 of 0.20 h v4,88brv1i0gwf,wxt)oo z(ks dip0 T. Find the magnetic flux through the loop when the planevrwxk p4,w,o18o0f0v8ti hsd )gz( ib 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 rotating in a uniform magnetic fiel)nza-6/io esid of 0.20 T. Find - 6z/sonaii)e the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20qt 9a:yp6y9,2diq+: mzrjr x r T. m pr, id q+62z99ry::jxra tyqFind 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 sjz70 mdxr o6c :6;eafof 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 cu)vax0cx *ip 6*8/mvieb4xr 2vv+ jlqoil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wipe29 r )loz0wmre on a square frame with sides 18 cm. A uniform magnetic field is applierw z)po2 9m0led 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 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 ,01 aqr+kss)8 bvpcwvhbg )o7 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 arl f 2e1ifsmxt7(hcmv/8qw2l7 ea $0.20 \; m^{2}$ 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 lp,w5qyl1921rlbq5mmdb5 nx yocation where the downward component of the wd bnl5,11mmx5bprq9q 5yy2l 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 mtg; de/ejns; mh ja5+i0 2fvr, long rotates at a constant angular velocity of 2.0 rad/s about a v0tj; asgn 5e;fd hvrj/,2i+me ertical 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 loxus6w v20uw4hops 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 consist q.e tdw;ip:)ukle2k* 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 $emf$.

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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 ,)zm9ue4ow s)n ,hk,n;pcq w bits 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 tz,p n;,9w) 4bk)encuhom wsq,he maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 t.0tw l+falfmeo 0 garlv -47.hurns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simv6e-ydm6+y0 dhgpok )ple AC generator with an output of 12 V maximum when rotated at )0-+omyv6kgepdhy d6 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 mazyaj+ g aj,ot mj6o6.3ximum $emf$ 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 ope5j 2inpomp,; wrates 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 moo)m n6:/y)dait igaa 8tor operates on 120 V ACmi )ao ad)gta8ny6i: /, 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 resxvgkj30qi.:ik 5 a7dsxk 9e: sistance 6.0 W is connected to a 24-V power supply. Th7:ksvi :5xk.aij3 9degx0 qske operating current 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 supply. * t .b1gpzdlz.5pelg ; The operating * p5;.1t llepggb.zzd 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 connected to a 24-V power supply. Thk cx)7i/ ggxjtj.6 ye)e operating current is 1.0 A at full speed. What is the bac )g/xx k iy7c.tgej)6jk $emf$ 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 primav 0lm 9gl 6r(f6,etawdry 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 p izjt1-min *u1.3u -iwjhl8 jrrimary of a transformer causes 14 A to flow in the secondary. How many turns are in the secondar3mtwuii.h j -n*rj18j luzi 1-y?

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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 turns0l:os6 h7(yq7t:y nmzvd7lwu are necessary in a 110-V primary if the 24-V secondary has 107 n :6w h0ozvllmu77s( yqdyt:0 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 coild3(wgni - 0b r-:nkgdfk3m3 mj and a 2000-turn secondary coil. If the current in tjn3w r3kg0gfbdmk --m(idn: 3he secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformereef 4.:ax(tyi5 qy gu,. Assuming 100% efficiency, how many a ( a,ix.gtyfq4ue ye5:mps 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 tra-udca *gzu3 he3,lik4 nsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 Vcl-4diz3k u g*e3u,h a. 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 rm nb9n+bg2( .zt) rdd60 turns on its primary coil and 300 turns on its secondary 9btn g2zd+.rm )r dnb(coil. If 120 V at 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 60 turaj k.z5na,vw0agy j+9-aqvr, y.fu-vns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the s5 ,0jqzvk fg-.+ 9nyj-yauw v.ava,arecondary?

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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 secon-m8vc;mv.bs mi o (leyt6.9vfdary has 200 turns. If the input current at the primary.m cbes9-m6 l.v; (o ftmyvi8v is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns l(ikhb ls3 t1( --sj(i;frnikand its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondai;( js(3 1-bs(nit-ikfh llkr ry 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 itsl7*cqor/-6 7srs lwi snuz* z) secondary has 200 turns. If the power inp 7rsl6q)7ri z *lw/*ss- onuzcut to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is sih -5zjc 5oop*;cmr/ usually stepped up to-j sh 5r* cic/zo;omp5 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped urc .lf8; 6,lnil1qwlftx k 7icfw,(5 ap 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 tran a1,c llrx q;cf n,il86.ilww5tfk7(f smission 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 ,ne1rzqdov ) /60 A of current at 120 V. The voltage is usually stepped up to 4500 V qv)r n,z e/do1by 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 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 has a total resistance,f0 myftu ,,ca of 0.60 W. A generator prta fm, ,,u0fcyoduces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 9u/l-tr x ;i hsz67dtcW. 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 oftzruxi/d; 76tl9s -ch 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. bziy73* xmhr/ i;e8or How much less power would be lost if the power were transmitted b* i/o3yzre;mhrx 78iat 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 ajngf:id gh 7)pul(y 2mf .j8*vtxt9n8t 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be sl*gv ffmgdjy2.utx 8 hpj(7n :i9)n8t tepped 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 energy is stored in t qwzp;a.asd 8mqst 6:v36c0qdhe coilqzd6qpsd c q3v:68aw0;.a stm's magnetic 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 ;n(nxkbs6p eax95 9egd7aq d318-H inductor. What is this circuit's tid;b 7(x9aqaxkpnn 65sed 3 9egme 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 indq 394opk4kh a an AC circuit where 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 is the pea9f xe 2zl9flm-k 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. e x7mn*k. t,ov;3bl : v;lzzmsWhat is the resistance of the lam: et3.lloxmmv;zv ks;, 7n*z bp?

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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 connecte b ,z ei9)b6ftzfi9m2j3*dtovd to a 120-V ac power supply. What is the peak current through t2 mb)*z j99,3itdoifz6 bft evhe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 12s ,- 3uum7omqf0-V ac power supply. What is the power dissipated in th ,uf7mmqs-3oue 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 resistor is 6(y --v-k,7gsv:h g8rbpfqt 8mgxc m j$I = 0.80 \sin (240 t)$. 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-gj 5mejm8 3g l7y12rydW 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,j nm- 862bq2koxocz e m7l*eo-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hzov n:in31:is.+djvn k?

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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 2.54ub x3eo6nlwek9 h1) a0-mH coil 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 wi2qlld;0lg8 de. dc se0ll 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 indu9yatwik+vo l9 qi l30cgvp v/ 6mpc17+uk 1f5nctive 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 68 wsme8tkwg; 8u/ 1gfd0-mH inductor when 120 V AC at a frequency of 20 kHz is app88w1suggk wdfm /8 ;etlied 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 thr+ vbmtqaj.lp cs9:-h - eevh3f)/b:nx ough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at fuaj5wlyng: o k9fi z pa::54410 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 capacitive reactvk :wmoo.3ht e.ujs,y ,./gp k7z+rda ance 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 of 1200 os vzqnfqw-d5a:l)k9fd0( g*0+ xwho 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 x b 0ct7iwm-,fcapacitive reactance of a 0.010-mF capacitor be 100 Wt-i7,fxm wc0 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 aux(rc j i-saa /(ndrx f2b8+4x 0.0010-mF 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 of an a(dtgbz rcniwrg8 j6.l;6 tg51c series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 1zgd56ibtgc;w 8j . r1lg6r tn(0.0 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 l+2c6 eln8 rw2f1.0 kchjx vhs7 hkhe9;v 2fccif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conneclh cke7j90hk22wrslfc82nhvvc6 f . +;hx1 ected 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, 20xl(y6sh;5b)9r xl4q4gv)ky , fkiio g-mH coil, and 1.0-mF capacitor are connected iny (ykq s4 loxgxi9rl) )v6fk;bi,h45 g 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 v/.tw8,yngqc4 7-w ps d 7ksow20-mH inductor, what is the impedance at 1000 sqp/sc7.vn-oww7w4 t8,ygkd 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, whax, 4wza3l or-qt is the phase angle at 10-w4q rz3xa,l o00 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with ckj uy(r0 .ayk: ht)z:a 20-mH coil and 1.0-mF capacithy cr0tj kuaz) k(:y.:or for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is 7 ish4iqcv,e 7needed in series with a 100-W resistor and 15-mH coil to get a total imp7s eqhi,7c4 viedance 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 ;/rjj doc4* ntsrh:/p for a total im/t d/n; hj*4ro jcsrp:pedance of 40000 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 1bu x5g5h (*bkd;e3u lqc0 nm*r.0-MHz for a total impedan( crb50q nugd kuhml;xe*3* b5ce 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 ilc-9 jb 4oc7:ng1 oadd3ei;xi n series with a 20-mF capacitor. What is the impedance at 1000 4bc7 ix;9:ej do 3gd1ila- cnoHz?

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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 9uz4fmqdyg* qfv 2ic7dzh *8 skmkq(, ulj)*: a 10-mF capacitor at 1.0 kHz for a total impedance of 4:9f*q)*vkfm i ml87*uzd2cz (gq 4 udhjkqsy,5 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in seri;;ei,sg3k rtm es with a 10-mF capacitor at 1.0 kHz for a phase angle e; irg3k;,tmsof $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz f* t6agvfnzn *b) w6, j6yxg:qaor a total impedann x)wgg6,* 6a:zf6jbvn* yt qace 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 capacidpdsb4w) 254c:uvmf wtor at 120 Hz. What is the phase am4cuw5wb: f) pv4sdd2 ngle?

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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-mHe)g) l6b)h, -eyv7o2ykee icb coil, and 1.0-mF capacitor )2k ey)h6libg,- )b7ecyv o eeare 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 ); dcq9hw,g(tv bwdj/7 g2v fpcapacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cifbwd9qj pc(wv/g 7d ,t2gh);v rcuit?

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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 capac(9i1 evd dlc/xitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in thisxd d 1/9ev(cil 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 x3sx 6w)f7(lgq 1j) tf5xj -kjnb6viwa 50-W resistor, a 10-mF capacitor, and a 0.45-Hx jbf-(wtxjxlfvgj 16kn) 35w)sq 76 i 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 resi.i. :aw6 g(-llhzpxsl stor for a phase angle oa(6p. lh .:-sw zlglxif $40^{\circ}$ 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 =1n,kri;4aowmg)e d7x 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving source , orei;7)dgx4mk wn1a?

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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 12/4nj5qg 0 gomz.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wh/ggzq0o5 n4 mjen 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 circuit is secqg +ex7 *jo, bhe:,$63^{\circ}$. 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 impedan3dtzquz a:,:o 8+udac ce of 60 W and a resistance of 30 W. What is th cz,3a+zu :aqtdu:o8 de power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 5pdp11algnnm5:a/ j0 h 0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pda5nl: 0jpg/a hm1n1power 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 8z;k -sszt3:(s 2(ujwwsbyh 2zugf+sc(3rhkn series?swury3h -fbkts:z2cz( ;2w8jks( uz sg3sh( +

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF cap : ype/kddo;r8acitor for a resonant frequenc:rdk 8pe; yod/y of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3*kbik 5tq4u:cg6)mk o6 iun1y.7-mH inductor for a resonant frequency of 1 b:16ty gkknu6i45ki uo*c q)m000 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 renl2y7 x;h+egf oum88b sistor and a 40-mH coil if the+ hnmolfgx b 8827y;ue resonant frequency of the circuit is to be 1000 Hz?

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