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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,f:;x eue dxxi a20*pa of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inductipj1 ly.ve8t 9 ml hmhk6+tn6n-on 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 .mmc8bm69buog()unx89 u dp oof wire in a coil produces what kind of change on the induceu 6.d mmco)ub9ox89g b( punm8d $emf$, 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 thc/90y -giw. f1bldbgo e magnetic field through a loop of wire produces what kind of cficg lb-go.dwy 0/ 19bhange 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 q*,ta 5bo ((y 9hvhwrrkind of change on the induced 5qhorw(,vht b9*yra( $emf$, 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 magne/33rhq -7dqb zf1tkw8 gi yfn f;uq)*s .dl-eitic 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,vtcja7zp a) *e+o )yj of an induced current in a conductor will be that which p ))eja oz,tvc*y7a+j 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 jd ez4e 6wgjh9 ,e vazc0yh.b+q8dh ,5zd 4jp4a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from aboveh,+p j,hd60y ahj.44q czdve5gze9wz j8dbe4 )

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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:b/ w)n dvcco5able. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when vie :cocbw)5d /nvwed 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 vecj o58omb,d3r/lsv sl/ tor points straighlj8omrd3l,5o/ bsvs/ t up. 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 t8r)kebh plc 9n+8 nvx a3d4eb6able top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in th 863a8hb k4rdpv ec+9e)bnlx nis 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 n,cc3*)js ki:qg eg+9ca 2tohregion where the magnetic field points stiac sj932 ne:kggt) ,+ccho*qraight 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 an eved8tesw 0nv8s,m) eny- r-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 curr,0 emw y8en)t8 dnvs-sent 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 1ip3x.u41x btj mzvi ngm3+,uof wire with the north pole entering first. As the north pole enters the wire, the ind bmxt ni +43v.,3uxz ipjmu11guced 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 angula,+fjw4qolpug j a)*;ar speed about an axis whose direction can be varied. In a region where)j4u; lj+qpwo aa *f,g a uniform 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 angular spee mi1ny0eru 58y0z,u s0t u-xavd about an axis whose direction can be varied. In a region where a uniform magnetic field pointu0isu005u nr,ym t yez x18-avs 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.aiz(dwgq0i88lcy: p ,
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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 yn t z78fqvy9;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 m1zxv xwm65nx3* p8f ykagnetic 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 (orientedl4u65ygg6 9 :laijjykx-.v eraep44z in the east-west direction) is moved northward at constant vee k4yvegy54.u j46 :l rg-lpi6x aa9jzlocity 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 bar rotates at a constf rv5,6, 66 jgza aajitv*4seyant 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 trabo ;4dxrw-q:znsforms

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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 ca(b6 wpp 2ah62b qu:frevolutions each second. The frequency of th2app :b26fauhw c 6q(be $emf$ 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 used7k8fo m+kadh+2m7rak c 1q h9j 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 t+buzyi 9lt .c jg4p(4fe5u(je(s: nmf hat

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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 l.deu7w9jf1) wn2fmg v oops than the primary coil 7w 21w9vju enffm)g.d 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 contains more loops th/8vm*zk- ld:wcs9nir bwx ,r 8an the secondary coil then it is r-w lnz:x*88mdk9 i,s /wrbcv 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+gavr7je)hj hk2 o 0a:y w(0,6 fsztvi power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circ(hmafx4()om guit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series tocpq zbb jtr1+o j72lnj* 80ut/4h h4yf an ideal battery of constant terminal voltage. At the moment contacz+hfnlp0 o*jjt42r17b ju hqctby /84 t 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 inducxd(h+9goeb10op5 d- b c sgy/ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thyd+-5eg0 s bccg( x1d/po9hboe voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to xo+t unv)n ;ck:kqh9qk:t0: tan $emf$. 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 induc0;d n xz: -8c;f:0ujzgcc bocjtance 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 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 9rg u8(cavvbl b/qu-sd9:krg;q8;:dvl9od d are connected in series to a battery. The time constant for the circuit represents the time revs k9ru: d;g-gd98bl(dqo:u;c/d 8 rvlv a9qbquired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batter1 qlqflzb8 okh7--z+ ry. The battery is suddenly removed lbzfr -ql 1o7q-h8 z+kfrom the circuit. The time constant for of the circuit represents 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 the same units ex799w;o vodkhc: rt1a xph;0gs0dcc4jcept:

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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 mr p;-*zjr;u bAC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC pow.e +beeh) hxs9er supply. In this circuit, the curren e)sex. e9h+bht

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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 v 9rxwpj56e z9 dic8r/factor when the frequency is trip 65cv dr/rwx 9p9z8eijled?

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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 a(g,1bkv o9m nan inductor is doubled, the inductive reac(gbk9o vm n1,atance 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 z/7, taw7hhic voltage across an inductor approaches zero, the inductive reactance 7ich /wztah7,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 ACctl zjdbrzfr .jog -9 umq51t*0:a.i. power supply. In this circuit, the currenmj0 tz9.q:d fojatcl51rr .gzb* .u-i t

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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 a nbreq(8kpab 5min/5vd a 4iu9-m ,c*xc circuit changes by what factor when the frequency i5r/ab n9ibimvcp,uq 54 - de (xamn*k8s tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor y yddq-)-.zi 2,fwz3lmg3jyx approaches zero, the capacitive reactance of that capacitormydxwy d-zi-3 fj.zl )32yqg,

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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 b+-7nqn4,oo : mlac t:8plrxtv7brsm(etween the voltages of the inductor and capacitor in a RLC seriesx8o: +a7r tpmvob (-l7nslrqncm,: 4t 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 9 w -7 iwf3bppa)lsfv7defined 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 ofif82dac a9y+);havz n the circuit increases if R increases. When is na+)a; zvdy8fa2h9 i cthis 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 increasm0tv4x8sv7 y7oy ,ub,qzs9x jes 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 impedance of the circuit increasm0 ugomvta/ b+;3z* zqes if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, thedujo oe2;6gzkh;) dr )*q(z fr resonant frequency of that circuit ;d2(u6qj;)org dhrz* kfo z)ewill

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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 voltaguwp,*c w.9k82ui7rcjg w/c mn ,cy w0ee. 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 serieseg+s k. ke8d0y RLC 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 in a uniform magnetic field of yyb*4bdx:b9tjh. b,g0.20 T. Find the magnetic flux through tth.:y4b bbjb x g9*,dyhe 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 unifk0o -kqh0:w*a*hfyzzp,,u je5k ngi7orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a* hk pfgq7 ey ,iu,az nh*5o0:0-kwzjknd 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 ixnz(yt+fl: i3 n a uniform magnetic field of 0.20 T. Fi l+3xy(:fn tzind 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 oqb 0q+w )mu.n epzf o,cv+04qef an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fro u rt09 (43jtmrvrqgq4m $4.0 \times 10^{-5} \; Wb$ 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 c5d 4813nitnkt7 yjln on a square frame with sides 18 cm. A uniform magnetic field is applied perpendiculytjk nn4c1n8l d i35t7ar 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 15ho.cmlss 47,sh(7 dge 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 :)o5py1av q/ 3d)exqs 1)t ndubkm3xsand area $0.20 \; m^{2}$ 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 horizontallo: tsdnm2jql;0l) no*z,x9u. w(mjh jy at a location where the downward com : ol. sdjnl)9 u*johjxz2mm (0w,t;qnponent 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 nr0e -srl)w :gis 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magneti-)w0rn :lsr gec 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 acmd0w o- hz2hfw,(.bn cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wlthw dm/ hsaj5zux7r536),,wgas 4 mu ire 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. Ejjr 1onyt).92 j(zyd dach loop is 12 cm long and 8 cnjy)y(zodj jd29 tr1 .m wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists ofg:kkt jsc9c16 b. t ,ukkd5 xqugxh/u4x0i7x) 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wiso)tb .t ni0p)b;hbi 1ggg7o n3h to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A1)bipg tt)g gb7.3in0 noo hb; 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 wiqcu ,mex:c :)dtgt:1q th a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operate/z,3exnyd ox q,4ye-os 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 have5o. 0hj4ndyap a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fulld4a pn y5jh0.o speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to gx)idc retp al( /s*5()ycqd)8zb,qq a 24-V power supply. The ced)xycaiz )q(psd) /b 5gr t*8l,q(q 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 9xk7v8it,e-yab y9f xis connected to a 24-V power supply. The operating current is 1.0 A at full speed. What ix9-k ,9f yyx7ae8i tbvs 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 resistanceqn+ka6kexa1q db) d(4)3cr 5 0vvpocg 6.0 W is connected to a 24-V power supply. The openaqkq40eg1x v6 rd(cva 3cpbk+))d5o rating 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 transforr0 0jjansa/t)mer is 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(4.m2xvvlt kgc s(ep8 A to flow in the secondary. How many turns are in the secom 82(v.xlce 4 vpt(sgkndary?

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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 necessanysvve(9 h ho1x. 4m-ery in a 110-V primary if the 24-V secondar1hme9svyn. - (4oe vhxy has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-y/dsrqw3(xu . turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is tq.y(wd/rxu 3 she 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 transformer. e.8ayru8aob.oee4 0c 8gw6zj Assuming 100% efficiency, 88.z6ar4bjoa 0uece. e wyog8how many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 Vq81 isa ,:8n md7cr;xoz -i0vlj2sxvc at 10.0 mA. The primary coil operates on 120 V. What z0 scna d:,xil7o; 88vsm- 2 xicqr1vjdoes 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 p,fgkos n(o kh /r9p2k9rimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present/(kp 2sg9,k orohfn9k 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 itsw:ij(y3m wl-k primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what clwiy 3- (:wkjmurrent is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. kpqs(;g 02 fq:g 0nojy If the input current at the primary is 100 A, wenf2:s o ;g0 j(ygqkqp0 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 and5dpacmfrq/u9f ,/+v c its secondary has 200 turns. If the input voltage to the primary is 100 V, wpr5v/ ,d+ qcff 9mc/aue 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 100 turn 5o5gckr 0l3fg2qyi/p s and its secondary has 200 turns. If the power input to the primary is 100 W3y20c l i5okgrpg 5q/f, 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 usually steppe3 yh5pcoz-dwp q h:-sj 2l:ir8d up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the sechos :zy8jq: hpl3--rc5d piw 2ondary 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 voltzv9/9* q rgj/ ah2a);thiojwvage 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 theia/)gjovha9;qv/9 w* rht2zj 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 current at 120 V. The voltage is usually *ax4zp,23 u i6lfq zqt xbku*8stepped 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 notu t, kl8* za*x34 fpui6xqbq2z 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 50qj24 e-boxi7qf6;mmk6 t sc/j km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, th7sf 2c4kqt; 6q6b-e /jixmjome 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 t.tjz f:97c6 zjibx ee2otal resistance of 0.60 W. A generator producjz2zx 9ctf :bj.ee67i es 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 power would be 9f; (74cf :fuyak-j8jwx dret lost if the power were transmitted at 3000:ajy8t4edf f( ;rxu-ck79wjf 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 t2uyk+fb /,xxlransmitted on a line with resistance of 0.60 W. To what voltage must the generalb+,f u/kyx x2tor output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energu ;( ,ikr)lbged1gi+xy is stored in the coil's magnetiibd, g(1;uerg li+)xkc 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 cont vzh2u/nxbs5t) 5i z-d )e48k )ydemwm:wsm u,ains a 6.0-W resistor and an 18-H inductor. What is this circuit's time const uu:wis8zdezhe24/y)5w-mvmbdsn , k5)xtm )ant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circun+o9ni)b b,t5fuqwz .it 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. Wf m+ svfs)xw+he xpnwub5..(5hat is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resir)mjjx )t2tw9rm qq ikq8:0 o7stance of the la q q9 oqt)rtj:8wmk0m i72)xjrmp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whatf gw lp5xq1-, q:g.,pknov p9 58toudv is the peak current through the resistor?p.,p t q9ovlugodgpq5f5:-8kx vwn, 1

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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. Whs o;:x obxy.yg.5k al5at is the power dissi.l. yoxoy5 s abgkx;5:pated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W re5,n brs50s f (i-0wb9ukydpwq sistor 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 iav(q6n+c99t;-tg 43vnj b cajm6txv$I = 0.80 \sin (240 t)$. 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 is zi o;20crv)hzj3fqb,$I = 0.80 \sin (240 t)$. 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-mHb+ rs25c2mwayj)6 pzl,)r. htn rt 2ek 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 Hzkmf )1 :f,kcoh?

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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-gc+k-u 5z:yhkmH 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+6 jg+sgiq w;jt(1bljn 5u 0it at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 2y t)x;fqs;skv.(9 zqr0 kHz is applied to ir y q;;()9t .xvzksqsft?

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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 du.y rmm3 uwe1 p e.p466kv8e4o9eauygbe 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 cap8 8kjwy2zm(qlr b+ e g1io/pa(acitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is cc rt/4 xx7;s(tzzd 6wneeded to have 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 ;ha )vrphon)9have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 Wrdky5ij/ r 7x: mp8u)su s)/yi7p x:5 rjr8mkd?

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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 t(x)6)d yv,r pvzppsd2hrough a 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 ac series circuit with 12n sd m9)nt svfu )iers4 -.hx6k*fj04u.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactjrf9xss*un)m64)4 vu - .f sitdh0nekance?

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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 r8wi+a( e ,)umj f*ebpj0vs y,ch 3j,ya 100-W resistor, 20-mH coil, and 1.0-mF capi8(0yhrv,a fejcbj)+semy3, j u* wp,acitor 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-Wp 069qyrb26wrkfq ah 5 resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?fa ywh5 q06pq26b9 krr

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wpl8gi 47l)a -ofn.fvohat is the impedance pv lg) if4l8fo -7.oanat 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series6dl s2s4oje xil+8,g+;jk qz5,a v qqx with a 20-mH inductor, what is the phd4zqvxj++q 8;xglls2qo ea i ,6,j5ksase 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-m h)4 j cct(y4noua,0lhH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500j4 nauo0h(hc4t) cy ,l 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 neededb/i itw) wu.z4 in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 zi / .itwbwu)4W 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 serievz; vqqfz-zqy 0+g1kgl9n29p s with a 450-mH inductor at 5000 Hz for a total impedance of 4 l9zqy1;nz-+9kq2fvvpq zgg0 0000 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;o2b dhu2)k8q s hkxaqk60 ,kit fu,7x a 100-kW resistor at 1.0-MHz for a total impedanc hbk,k dk8q)i27k;0o26 q,sx uafthux e of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-pvejlb +xi 2(ams:gp8t, 9 ph8mF capacitor. What is the impedance at 100ph: txb9ajp m88sl,ig (+pev 20 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capac5m ne6r8cz)84 evu gxpitor at 1.0 kHz for a total 4vz8u ) 6mer5xpn8 gceimpedance 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 capacitor at 1.0 yln0 . ;qgacf)kHz for a phase aflqgn0.ac ;) yngle 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 ne mpupn.xz p(8b4r)cp( eded in series with a 30-W resistor at 1.0 kHz for a total im(4pprxb)mu(.8np pzcpedance 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 witvj tl lx3 8/,5lxhfw;th a 100-mF capacitor at 120 Hz. What is the phasex,j5l8 f w thv3tx/ll; angle?

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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 1d mwg/0r:8kca ms2tyfb 5se7+00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s :8b2yw5ecg/rktf7sma+ dsm0eries?

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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 /x xel,1vishs wwtk .;ss-g.6resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz ksxtgi ,1sw;s/ve.xs h.l-6w power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive rea: (sqjr9x)m veaq-5dvctance 30 W, and an inductor of inductive reactance 30)5ra v(jxq:sd q em-v9 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W r wxd:i4 i(xg.q 38nqh -qjk3tcesistor, a 10-mF capacitor, and a 0.45-H inductor, whenqwd .:3c-h kx3in8 tg( 4xqijq 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 seriesmw43bs85y- 6cpuw qme ; ksr;u with a 500-W resistor for a phase angle of w-q4u eb5k upscws; m;86y m3r$40^{\circ}$ 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 =phdugs0q , ( 4**vdasj 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from uvd*g* ,0shpqsad (j 4the 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 outputpdoqloa ; mwzqjp, 35c t1wag:p 8n.,/ in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when theg dnlpow;w5oq.,j1/t mqa8 p3,a :cpz 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 1 4l8tkq e.28/gyfgq2k hwmq ou+jkk/$63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistancz tt) 2pkn)m-oe of 30 W. What is2npm-t oz)tk ) the 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 ar6;zf/auwyd9fbxw),x p a n( 5 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6 (, uan 95rwz6fyabwxf d/)x;p0-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 )c8dpo w+pdw ,a 15-mH coil in series?p8o, +wdpc)wd

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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 c *dcjelagt-*) apacitor for a resonant frequency of 10*ce)*lja gt d- 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-m)yw*g 9b apfg6H inductor for a resonant frequency ) *wgf9 gyabp6of 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 9zwk+ +j ;k3dm7rgcwgmhwl5 8placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circui+ck9 rk75w;w8whd3mg+ mjglzt is to be 1000 Hz?

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