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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 c1b*omj 3jpqjk7 z-r feks8 -/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 states t bd*w)ld3ej0.*x hg ashat 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 co- x( ezr1cp, trm9*hohange on the inp t-zo,rc(*roe 1xm9hduced $emf$, 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 ofzn8jmv ;8axfk /lc4.n wire produces whatz.aj8 ;xn84/lmc fknv kind 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 c,mwtjin+ z5,-wfy+oo:jz t.s hange on the induzwnzo +:s ,w ytmj+. 5t,fjoi-ced $emf$, 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 fro2e 9fatrmkswz 6 ;w,.bm 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 current in a o i;;ukqy3 urun+8le. conductor will beyu.irqk ; 8u3lnu+oe; 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 i fog08ducw.3bs held above its center with its north pole pointing down. Th0c8 b3dwf .ouge 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 tablae8x .-3rrf ag;0ca zue. A bar magnet is held above itsucrea rz0a;x -.a3f8 g center with 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 field vector pxfai yzj; ,mf7bbw.4+oints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fadejw 7xyzm,+abfib. f; 4s?

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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 w w;g vcf86lgud:z bi6qvt09y*here the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current iq:0*fg;ub6yt8g vliz6c d 9 wvn 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 maghmg:6zn 1 ty6 qb-5vmanetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the inducy6m 5maz -bntq1ghv:6 ed 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 horipo+v- u h7/yhzbu8 lh;8r /vjwzontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eith-/y+rp8;uv /h7u hjvzw8lboh er 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 entering::mr4sjmy gv 5jyic*i etbue4,(ud-: first. As the north pole enters the wire, the induced current willy m,:sitecyjuem(bj u5: -*v4:dir4g 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 axis whos(:pn y+uk b2dye direction can be varied. In a region where a uni 2ydbu:k+(n ypform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant an(v0n-zjexc 6:2 iz se+defdx:gular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's e +xfvcdx :0n2ede6zi(sz j:- 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.ws2471j1nw xxy vs1u- ztz2z c
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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 anmay onkw-1.*7 lj4+/ w l;w;l bttuqjk $emf$ 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 magnetidfx -9ls rnomir 11:v4c 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 direction) is mok n-a 5ej;x) lcxaf.tvx.o5n)ved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrosse-nxx fa5va)knl.)5.j xo; tc 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 angulas b.0ws xx0x. px0fy:dr 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 transf bfzd9 sv- ,.rufhl0)wr,zq* iorms

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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 se7gms l. beva:b6.u*di cond. The frequency of the 7geubdval 6.is:m*.b$emf$ 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 de.to,wr.y+7q;ej5zpkj kr 9z .8/ 5yel npqtjovice 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 s. cu /rza)t(dthat

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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 m :5dj6+ k((y;hu6 ljs6blo ehox4xrx core loops than the primary coil(dl ky hhx j 6j;obe(s5xlr 6:u6xo4+c 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 primarof w4vk2;.m8.vwlnc ezvlf ; 8y coil contains more loops than the secondary coil then itml;z28 .f fe8ol4w vv kv.;nwc 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 input;m8nf 9o q*hv;hu9vdd

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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 resonan;9en4o9k2fer0pd i ti( *o yntt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an induqkowdx698l9h( xg yx2 ctor are connected in series to an ideal battery of constant terminal voltage. At txkyd69q29 ( xo8gh wxlhe 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 ideu (mr(tjm :w kfcg2,,kal battery of constant terminal voltag:gc,rjkt k, u(mwfm(2e. 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 b yb7lq+ lw)1dm n)l0 4pn+jm l4dxr7mwith inductance 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 resistance R is connectec ,4r te/tx 9efxm; ;sie q4dgh8g:w7bd 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 indu 48k.smb+; vkdw,u+r10lva y4kalhx hctor are connected in series to a battery. The time constant for the circuit represents the time required for thsuk hd0w.k1a+l4lbxy8 ,r +m ;k vahv4e 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 ifp,xh /oxgf-a2 n2(zare connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit repno,-zxi2( 2fa x /hgfpresents 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 th7 du. ; xzh32febdwd.z0iui4oxyf+1u e 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. Ontsk c)z *t-1ood,fw9 t 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 this circuitgqjn .j s1j3 nbxp/j(vr30y6v , the curren/n 30q1vb.j6yx3j nsrvj gj p(t

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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 frequenyd , 7ooxudk2)lw9c4mcy is tripx o4d7yk)uw,mdoc92l led?

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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, theu 0- g)o8ehbsa inductive reactance of that induus- g8boeh 0a)ctor

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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 vol2hr q;cc4 uyjd6(lld7 tage across an inductor approaches zero, the inductive reactance of tharcc(ql7yu;lh42dj 6 d t 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 s4cq 9 oum(o6elupply. In this circuit, the curren96 o(e4qmloc ut

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance inizx)8d:z sl +) oisgmu* yq2g) an ac circuit changes by what factor when the frequenx 8*iuz) qyzdls +sg) mg):o2icy 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 vo vw fnh9k8d1 qfdx- uzvg,n6*.ltage across a capacitor approaches zero, the capacitive reactancq f w dh*91f8vdnu.,zvg-nkx6e 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 f pjs,pwu+- lbv/wampl1b xp-.:d77bthe voltages of the inductor and capacitor in a RLC sebf jwlpvu lm7-bpbpdwp-. a7x+s/:,1ries 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 circumvqk )m)--zb az,hu/ uit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of v:)g3j5zdloh(zo4i n the circuit increases if R increases. When is this st4jdgvooz z (): inlh35atement 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 imgy yonfh1o 0k;-f5p4tpedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedanc) .ln6fc 90t mz5yputfe 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 l2 zt2vfz :3voboth double in an LRC series circuit, the resonant freq2f3l o2tzv :vzuency 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 drive(e 2dm +h1fuipn q7b2wn by an AC applied voltage. 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 occurs )ie ccnd*+ -wpwhen

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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 fiew81 s3z tfp6hrih. 0gkh )7a;nmw9ftild of 0.20 T. Fintm pnr0iwhi; fa79w gh81.fzt ) 63hskd the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.2naodxx 5f).q8x+k h(m0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular. ( +8dm5xfohn)xxk.qa

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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+-enm8 rz ,adh 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnet h8+ndrze,a-mic 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 areav :qxx:,cr7p s of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changeqdub iy85-x 7ds from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame wi6-o+ wm up*lhkth sides 18 cm. A unikh6u -o l+p*wmform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of 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 h38x dxnfl+e8( o fa:okb zr6,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 a+ f2ow2ou6 6vxef8tf fc, 6iporea $0.20 \; m^{2}$ 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 wherwid1f lk9 ;da;e the downward compon; d;l9f1da iwkent 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 long rotates at a consta gw/mmoliwar9/+ce(1;n q6f.q .lt o xnt angular velocity of 2.0 rad/s about a vertical axis /t(aeo1 qqwgfmr.l;cm6liw .+/ n9xo 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-sectio.x n5cgwf 50ie5 x+d 0mei7oujnal area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arep107spw p 5ckga $0.090 \; m^{2}$ 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 armatu/8on8rk+jm. pglsw m/re. 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 0nrp m88sj.m wg/l o/+k.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tur4hyi/q4v ,ftg ns 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 simple AC generator with aw/aq)5 ipk6go n output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0i/o) gaq wk65p.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 ek 74ie+h o5ftdt:w.fa 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 re)mceg:5 2b )/ya wucfjsistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor onwa,2 g -rs e7oik:i2ntr 4im/perates on 120 V AC, and when running r n7/iim 4nig-k sre2:2 woat,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 t7b e b7)znv7eresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is t eeb7v7)bzn7 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 resl z-ev6.0kis gistance 6.0 W is connected to a 24-V power supply. The operating0ies.- lzkg6v 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/* wnwf;g+wobemoyowa0 .6 g0 power supply. The operating current is 1.0m06owb we;0gf a.owgw no/ y+* 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 ( r.ua*5 khzop:b.raxhqi+ w2is needed 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,wos/ )xk c44zdothxooj: 3oh9 6v8m h in the secondary. How many turns are in the se4x 6o)oo4ctdv o 3hwoj8 z:km/hs9h,xcondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24*kz. bkf 2 slpdm+g1760czhxi-V secondary hablp.26 z*ck hzxfk7igdms+0 1s 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 coil and a 2000-turn secondary co .altf dqwt *2a/5o*gmil. If the current in the secondary is 3.0 A, what is the ct./lwgatofq2 5 a **dmurrent in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. e(bp4nqj :kw . Assuming 100% efficiency, how many4:jnp kb.we(q amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transforbsel:)yl0v/e mer provides 7500 V at 10.0 mA. The primary coil operates :e elvyl)0b/son 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 305yq)5o(4 icek c6 kcp7vzzk(q 0 turns on its secondary coil. If 120 V at c6ze 7pqicockv )4q55y( kz(k2.0 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 turns on its primary coil q 7( jc 0ruj2esale3k01bgi9 rand 300 turns on its secondaryck ue3r (s1q7gaj0l2jer9b 0i coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 10gbj cbr( 0b1h40 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current gbh b10 b4(jrcat 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 10032 9hrcvrdz; s turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the ou9r; z32rchvds tput voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondo/o1ejsrc8vk4 - +y hj0 v;jy o70aoyqary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictioayvhk /o ye oj70scq4vo j-y10j +;8ronal 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 currenm ddwx*f:;x 0rt at 120 V. The voltage is usually stepped up to 4500 V by a transformer 0;fdx*: mrxdw 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. Thex/beu-rab( e2 1)iki yrq(4tm voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1./r1yt4m iei rb)ku2qe( -axb(0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curr )zgucfvk(:5dent 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 g dkf:)5u(zvcpower 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 resista v .sq 81cwgi;od2x(a6 x(yocjnce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loivoc (dxc2j6 xgo8;w(y1s .qass 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 W.bvk. ,4 j* i q2effxrkzu+8h8w A generator produces jr4ib v*fqu x82 zkh.k,f we8+100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less po hg;9jbjw:*:nzxr*rv wer would be lost if the ;bn: 9x*rjjzrv:ghw*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 geneal-uz( jesi7j o 0bk3*rator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.0-osj l7j (ia*u3z0ekb10% 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 2y, gm,c9xkfn much energy is stored in the coil's,m2gnk, ycx9 f 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./xwxcj9cy ew-6y) i i,0-W resistor and an 18-H inductor. What is this circuit's time con 9w ix)eji- c6wyc,y/xstant?

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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 3a5,xy8 fqsw9q c( fgqan 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. u9)hbhe n l4l- What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is theekv4c i,b4 5gb resistance of the la4k ,egci4b b5vmp?

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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 co+1 n 4rtql *dmph9e*xcnnected to a 120-V ac power supply. What is the peak current through the resildq4*1+9xntmc* phe rstor?

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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. j)4 n+zo .q2x:;xlld rgq7qf:qaogd, What is the power dissipated ij d;:gl.q dq2oln,:7 xo qaf +)zqxg4rn 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 resistoj +olee4cb. onx, o.(ar 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- td2sulx 1/f wpn25ge.W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor e wgtnj1/i*pmuhft1 :ryo8496i; sm r( af f)zis $I = 0.80 \sin (240 t)$. 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.fww -zzyw- *d30-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- pxg k+zxp-)6ntp.jm)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 will a6wuc0 w6 . e2ekakif(r 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 10eb1t+; kbxkz0k* -1c:ixlxjy 00 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 12fb9 )ur sr)zwil-vn,30 V AC at a frequency of 20 kHz isb u, )vw)9 zf3snrrl-i applied 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 2.5)zufl-4;*y4 byvbcwd 6a) q gq0-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 1yhz+ooa 7xvb;:kq/5r0 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 hav 1 / ysnyi;c6azjtt3q*e 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have j*99yz*zb,oyb d h+ rea reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive react -skr3h4;fp/ep sipq. ance of a 0.010-mF capacitor be 100 W?rsp / ;3p-iefpqks.4h

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz . ypf ;fvf/9lzs;kb* wand 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15snl*/:qqh4 9 upmwk uqb4v1+y .0 W inductive reactance, and 10.0 W capacitive reactan q1p+y/44nq:*qlbw9vk umu s hce?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 10y :dxu3,gww)j) ljtyas3 0b s-0-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sel xj)3-w :ysaub3dyg ,)wj0tsries?

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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 100-2ub:8 z-k . xdy eb4d;vjw k: 7;hicnt2bez,qdW resistor, 20-mH coil, and 1.0-mF capacit2z i vuk,:bqj-ebz2thek: wd; dc4;xn8d 7.by or are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20gm)+ 2,f4cklyvyce 7w-mH inductor, what is the impedance y me7g) yc+f2c4kvw,lat 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 itq:x359mqzsc s connected in series with a 20-mH inductor, what is the phaseqqcs: 9z5xm 3t angle 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 in a series circuit with a 20-mH coil and 1.0-mF capai d) z2hjhwao*g76az *citor for a total impzai)z * *o6wjha7hd g2edance 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 neb*od0 d )/pqvreded in series with a 100-W resistor and 15-mH coil to get a todq r0 dbp/v)*otal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz f+21 2vh/xq*vdhsnj fi7ho ns.t bovv u7,w*t 4or a total impe,fvwh v*h*.7hubqtst7vov+ s o2 xjn/1i4 n2ddance 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 re0r.csi-1al dwtn,nh 8 sistor at 1.0-MHz for a total ih ws.trna1 8nc0dl- ,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 se6 rimrg1 s+ ero6j+t8qries with a 20-mF capacitor. What is the impedance at 1000 ermgi q jr6ost86+ +r1Hz?

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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 .w* +ny,3d peg+boa xlfor a total impedance ofeap xy+o.,b lwgd3 +n* 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 neededuj.y 0vzgj3/sys). xt in series with a 10-mF capacitor at 1.0 kHz for a phase sx3j0) ..z uy/ ytgjvsangle 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 resistor at 1.0 kHz for ,8*njav we sb:i2bo *ca total impedance of 4ecob8 bv *wsj,*:2ani 5 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 is vqt9 )u ,f(uo,pawj2* gv83fm sxw9tn series with a 100-mF capacitor at 120 Hz. What is the phase anwj p 3f* wqmo2 uut9v9)sgx,saf8vt(,gle?

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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 pk o49ts 3om6vif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connects 9 4vomk3op6ted 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 consistss t7n j lyc8+6a9:hbec of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connectelj9ebc:scayn+8 t 76hd 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 ofg 5q(frk7: 5u: :xzd1igw8b utrnmay, capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power soqmi r5rt,x:bug:8 :1d y5 gw7fa(zuknurce. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, sy*0q14t-pxs l iuud +a 10-mF capacitor, and a 0.45-H inductor, when c+squd s4ulp ti* 1y0-xonnected 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 phaset ffqs wd)3d0m*p2 q.y )mff:x angle of yfm3:*sx p) d.0qqw tfdf2)fm$40^{\circ}$ 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 gmg /;i ret 9mxgzo-)-/q;6jixtmgf0 = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have /xi6me ;;g0-i) gf-rjt9xgmzgm toq/maximum power transferred 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 *lkbcaco w 0tndrbh v0)48;4n an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, n) ahol*dnwk0r 4 ;cb80c 4btvwhen 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 circu )j;6fni9rl grit 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 a(a0x5a j ts4fvn impedance of 60 W and a resistance of 30 W. What is the power factoxa0 ft5(s a4jvr?

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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 crhfcyh8; vw1y3jw05z1 e zs+ montaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppym5 fehv01z1+ rhc;z w8w ys3jly?

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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-mHrhct gu-r 5m2c.0ax3:rx fsd5 coil in series?s. mg:rr2- ucxcd5 ht0r5 a3fx

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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 serie8 cu 78fsrjl4ts with a 4.7-mF capacitor for a resonant frequency of 10 r7 t jf84l8usckHz?

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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 induc uds a.y7pa5) .jhpxstibq)1 3tor for a resonant frequency of 100pq1p sja)u 5ti aybh3. xds).70 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 xr5ry )fi+o) w30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hzoy)5w)i+ fx rr?

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