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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 magnec(eo0km ,lsm-vnp 6g0tic 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 induction s7 yqi3yq v/9qs sv .-ddioeku34c0kh,tates 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 cv 2pnta0jy)5c s5wv5ytx*2lt hange on ttv ptx)0a5c vls2t525yw*yj nhe induced $emf$, 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 prow9 m:h4 cnd+ihfzd)q -duces what kind of chanqd- )wcnd h 94+fhz:imge 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 loopo7w7) elk tehm-d/9q v of wire produces what kind of change on the induth koe/qdvm e )l9w7-7ced $emf$, 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 magne0viz4nz;j(y fw-1s kltic 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 ikp un:, m*dq+dpg l)rhw6)w)an a conductor will be that which tends to hap,) rnl6qd)w+)k gud*p:mw produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is hx4mhw; is9s2aeld above its cente9 shws2amx;4i r with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ab82mkvq0c a /febr./bcove its center with its north pol8cr/ .0fbeabc/vq2km e 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 regio6wzze6l:m2 bln where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currentz zemlb w:662l in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fie 25lgbbp*pr, /vzmy l1tyg;j3 ld vector points straight up. The magnetic field suddenly grows stronger. Whvb g3l;,gyly/b*5jz2p t1 pmren 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 tobrun7h +2:niclvh0( cp in a region where the magnetic field points straight down. chc+ b(hr n0v2i :nul7 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 ever-in:2, jax zvpzn zd ps kgip;)v26. odo(,+et*gxcreasing current northward. Two coils of wire liev id2x.o ;sz2gtg)zppedz* x a:nkj 6+op,,v( flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole e( vuesj-f 6yuky k;6r,ntering first. As the north- ;,(f 6k yy6rvusjuek pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wht(t jm:q6cyu3ose direction can be varied. In a yq:m tu6jc(t3 region where 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 speed about an anu1o*vi2c kcc-a5y+ k xis 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 axis of rotation if the induceca i c1vy*+5o-k uc2knd $emf$ 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.w; vu bbu0u-b5
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an /xr17w3fo kd0 erf f2qs 4bwg.$emf$ 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 ac4wts2w a,, .w2q7 ,pmwwrtwd magnetic 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 trw(:*p.3v zg nrzo2n hhe east-west direction) is moved northward at constazzw(hrn *g :3orp n.v2nt velocity 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 a9kfnty+9gk2 w 5q ;byht 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 3ksi5y)(s1 kvmv:ua y 9i.ucy7ja5 vm z6 v8zjtransforms

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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 revolutiondtq+ojriqp3e42p-at(cf m58 s each second. The frequency of theo4 (2rc5fpiq8p+3-taqmet j d $emf$ 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 de0,q.fy q pnk6fw1b5: pd,npj ej+ ce1yvice 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 tha30.x ) l0 uoan+ fvy;bwn8jc,r xyt6jnt

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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 coiu/gw- 2v5 gvun edd91kl contains more loops than the primary coig g-kv u25wu9nde1/dv l 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 pg 4r6g;pxw *54gl7 bylhqwnex)gn;. loops than the secondary coil then ;4 wg g)6pnln *h;x5px7w g.ebgylr4qit 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 pv*mj 2y p4o)rz/r57jck* gljr3h 5 veuower 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 resonamx gv; 3c 1hjey)zsq7-nt 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 inductor are connected in series to an ideal battery ; j ymsmzne8;9of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistorjs;mez9m ;8yn is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of convp/uya pz++rg-k7 bu-stant terminal voltage. At the mop pb +k-r7+yv g/zuu-ament contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conje 964.5i we;y /k7rmuouylx jo4z5 lynected 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 resistanca ua3:n ot/mb6e R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time consf8 xpc)b;l .l bk*(qw;uro6pitant for the circuit represents the time required for the current to rxq( wpo6r.fl lp;8 bc;)buki *each

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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 battery. The batt,(+jd; ou k0yy* : ;gcoakzzws60q eecery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cs*0ku zw:( ; kyyq0,ce6aodgj;cze+ ourrent 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 haz/apx8f;s vx 6ve the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the current rejw(w3ydez,9 ehi1v)o 4gxt f- h0.d

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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 circuitieve5uq;w(mwctri. 6oaa48 ; , the currenwro.c(8v etq;iu 5a6i 4me wa;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 b2pg;oo xb x-fm8 a+o1iy what factor when the frequency is tripl+m o2o;xa-g8bf oipx1ed?

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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 acroip klj +8 hn;:kod nib(vw/5ifl7/4lu ss an inductor is doubled, the inductive reactance of that u8i4l+/ f/ :bvnhjlpdilw ok57i; n (kinductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the itrkxn5y)/*vnxa 08kigzpr - dc2 w-7zoi3 s+f nductive reactance of thaon 2 /z3givpr+ky7 -50a rtwfzs*8- i) nkcxdxt 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 poosh/, lzlsn3*wer supply. In this circuit, the current3o, zhns/sl*l

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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.v9xop kj34sr19bxj 7 ibflg 07q :5u.flqzum factor when the frequency iiulf0: okf7pxz4jjb5 9vq..q7g 1s3rmbu9 xls 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 approaches zero, the 21y pg*6gqj xp)7aebh g8aekpg zm621capacitive pak 1ejp)7pby 2 m66egza*xg8gh2gq1reactance 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 an 1z bdd5d/e- tryh:ysd(aj4a;gle between the voltages of the inductor and capacitor in a RLC ser (;jab:dezy tsda5d-/hr1y 4dies 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 lp;lzyt1: z ,xgo;9rm 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. Ths q,z8 w7zoc7le impedance of the circuit increases if R increases. When is thi8z l7 so,zqw7cs 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 tu- s3jd)1:azouv7ih, kzkl0 vhe 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 impedance of the circuit increases if)oleo(hk* ri1(x4lit $X_C$ 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 doub * fvki1cw*yzc1f;ux ,le in an LRC series circuit, the resonant frequency ox1*f *uc1cwzi ;v,kfy f 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 ;ekzg 2 q/q9c9 od2gwfvoltage. 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 Rzl fopk e*0 4-jysu*7h 8r4araLC 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 radiusxn.cjdl +tt 6i, fx36j 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loon6+x,l ic.xdj 6fttj3p 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 radiu*6qh b+wv)6-n hhikdp*knj /1f+kihe s 0.10 m is rotating in a uniform magnetic field of 0.20-nn6k h kh*ej1)iw/*hivbfh +6 p +kqd T. Find 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 fiely4v,zx+ojtzc , s3t8pd of 0.20 T. Find the mz,4c v3 zy8,pso tjx+tagnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjusl (5)b txu6 e1,8zc a.slzjd/jmxy3ictable 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 c2+ s+9*te-srzwjhyn,n7f r hdd 3gnh6oil 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 wire on a squareh pr -pm1//,*i/oghoufyu2 pk frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coilmp*/hu2-h// rupio1 gky,pof. 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 1ckly ).(uo* qs nh/qt55 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area e,r4t0(b. 6tu)sszy9 grcidu nbqo;.1o* uep$0.20 \; m^{2}$ 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 ofrn.an9 ynfilvdu(: w*; 3w u;k 60 m flies horizontally at a location where the downward component of the Earth's mag yk;u;irdf3 :lnn .(9wvn*ua wnetic 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 constdj: h)2jd( ppxw2m7 ,q3+ytmje*aof uant angular velocity of 2.0 rad/s about a vertical axis throughdj7h *,opftj:m+w d22ue(3) mpxaqj y one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area ofgo1pbyz wuok*9mgixc:x9 ,j 0 qb3x+ + $0.25 \; m^{2}$. 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 consisux,j 1fr-( eva z ,u9e8di6mh: sxi.bats 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 rectangubto5wvg p 2o9; 5/lcjxlar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm v /2tgoc5op 5l9jwbx ;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 consistst+s s(afo;xh - of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator w+c s 54ubz lwm2tn3rd4ith an output of 12 V maximum when rotated at 60 Hz. A magnetic field of u5 t + l43zwc4rnmd2sb0.050 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 maximumj3:tq1qmz7ocv ucg2 u)an,k) $emf$ 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 opj-4 0f/j b,mq,rjrdlu erates 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 hs- dc86l-4yvlv5ccp dave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full sdc-6d84 c5-cvl vyslppeed 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 6.0bl05szvly8 .* c* kjbh W is connected to a 24-V power supply. Thekclh*b5vlyjb 0.*8sz 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 sup /jf n hc;(fl 5+1nxvfa9yt5ioply. The operating current is 1.0 A l+x5t fnjv(n19ia fc/fho y;5at 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 re . g(0od 3ukknwq oymas) u3))khk*,oesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at )og.uk h mykeu, ) o033anq)swkodk(*full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pqhqhnk 1y+1f 8tj),z trimary 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 primaryx5nqw ii5th2ldx h(* 0 of a transformer causes 14 A to flow in the secondary. lh0 5wnixhdiqxt2 *(5How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if4szd8*nf wv 8klo7ta/ the 24-V secondary has fw 7kz/nslt4od 8a*v 8100 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 an-c3oe lid,ns/d a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in i cd-n/o ,sle3the 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 transfb94)7gsc z mnnormer. Assuming 100% efficiency, how many amps at 24 V can flow in t94 nmsgbz7n) che 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 o)evy6e px zv el.11sq,f a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates v.1qpsv exy6ee1 ),lz on 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 300 tkqdtz exf 6*02ypcy -cd-.c)murns on its second2mex-y z)c-6d*c . fypckdq0tary 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 turns on its primary coil and 300 turns on its se 6aeae 9x/u6zs;snug7 condary coil. If 120 V at 2.0 A is applied to the p;6a gssu 9/x6 zaueen7rimary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary h 8jhs.i hycz(7as 200 turns. If the input current at thj(y ihs7.h8z ce primary 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 and its secondary has 200 tug7+ykyh)w sd2r v/ 8ltrns. If the input voltage to the primary is 100 V, we can expect the output vtvys /+d78hlg2y) rwk oltage 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 ljg p-;/on*u2wym2tfau uf7k-2 fw d*turns and its secondary has 200 turns. If the power input to th2um7f; fnlujo *pk 2* t-uagf dy/w2-we 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 currentz5o/ue/) 9wtxzag pti 7 r7b.j at 120 V. The voltage is usually stepped up to 4500 V by a transftg5z/e pu)a 9w7/tj xbr.i7 ozormer 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 gf9,77*dnnnzpxo (yy ,5u gwr stepped up to 4500 V by a transformer and transmitted through a power line of total resisyn,,rg gnfw* p5xz7ny (o7d9utance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagayl 7)s;gtx7oe is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the traa y7)txslgo7;nsmission 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 40r u9cqg 4zaoa total resistance of 0.60 W. A generator produces 100 V at 70 Acru4zgoq 9a 40. 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 totayb+2-j u(ccz/. wrpf qcii;1kl resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the w;zyc( k+i-ib2q /jru1f.pcc 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 b4atqbww9j q /7gg2mm2 e lost if the power were transmitted at 3000 V instead oqwam2g/2 g4j7 t9wb qmf at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on 8;r c kcd5w9xu ;j /sow2)fjwfa line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer ifcocd; f)8fxuj5w;wws9j / k2r 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 :wq;kz sy,/sz of 5.0 A. How much energy is stored in the coil's magnetic fie,yssw ; :kzz/qld?

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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 18-H indu3 oh* 8c3okwf*l xks;qctor. What is this circuit's tic 3oo; x*ks q8lk3fwh*me 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 voltds *(u 6nhc+fb:xuzi0age in 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 wg9p+(rw8)08ry tfk: bxcb2x f bcl f3a 120-V AC outlet. 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 int 10p4-((pvrgc-n4 + cwb1ckueotk )g8akmxxp o a 120-V AC outlet. What is the resistance of the lam kcpgk+041wt)xm -k8ccn ob4p -(gvp1(arex up?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peakmv*v swn0b56 g current through the resistornbsvmg w65* 0v?

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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 connep6d 9 ,r2nrcsucted to a 120-V ac power supply. What is the power dissipated in ther,s u62cnp9 rd 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 resibk 34tl,mwxusn.;8 n1mc lnma cx(z; 3stor 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 i(qevzr0.1doo. rrg (r s $I = 0.80 \sin (240 t)$. 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 50gdp nx t **c9+.pka7crytij+2-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-mH0.uvz i cvd84g 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 re yta mik1g9h/7actance of a 2.50-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 ys 86ggq1kcf5a 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 ind3uk:l 5cb8es*y7cir b 8hti3huctive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency ovxal/1gi2jw s.0vnf 3f gx01l f 20 kHz is 3g0vf a l21n0s xlw.fxv/jg i1applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.su1x px6+1r jxgzss-* 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 ays* x2r493xnf;ettkwn l3 3agt 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have xi y;2xz7gmts/ dsq5 1,s.wgj 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-mFh.lq;r h2tv*)rf uai ll9c-ynp, t)kt 3-ld1k capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitr0 k7. fb7u+jxzhs9yw or be 100 Wh+s 7ybf r.jxkuz709 w?

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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 andz3 rz, djj-6ycp am:vq-18okhtjz 9c6 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, 15.0 W inbzsi or/he(ib)g(/cp j j6:) uductive reactance, anpb( obj:iz6( ))s e/jc hrgi/ud 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and ,s cl0txw/ken f8 h*j-*nu o.r1.0-mF capacitor *-8ul n xf.w*csk,enjhro/0 tare connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor6ld,f qlw1,ose.z m1anf1 1ou, 20-mH coil, and 1.0-mF capacitor are connected in sed6fo,fo11al lq zwnm1ue1s ,.ries?

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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 withlbd9 3 tv(bjn7qj np2( a 20-mH inductor, what is the impedanc(pjbj2 dtl7 3 9nq(vnbe at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whaty*rh r3rz nct1dkagak59 9f s 18r,t,i is the phase ar1 ad 1 h9rrn9k3,ziy*kaf5t8t scgr,ngle 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 coiukp 9kb 089 4skb ;xhhmo,hc6gl and 1.0-mF capacitor for abg ks h9ckb0 49x8hoh pm,u6;k 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 c +d-c)qd4bnv 8ft3xslapacitances is needed in series with a 100-W resistor and 15-mH coil to get a ton- fvlqd)sb8 +4 xtcd3tal 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 ;hk(6(cmqr qabe put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40kq ;6(q (ahmcr000 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 1rdlub:qt8 loj07l7- n.0-MHz for a total impedance of 150 k - 7qn tjl:do0bulr8l7W?

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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 syy2l*v59m6.hxw i z4rc8k ezy eries with a 20-mF capacitor. What is the impedance at 10k2yz eyv9c. l 8r*iw6 5mh4xyz00 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a d/i llgggup0k5, 3:lvax-dzp+* d, qztotal impedance of g 3l d0zklq5adl*ppg i,xg /d-vz,u+: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 w3e -.ap9kzlgnith a 10-mF capacitor at 1.0 kHz for a phas 9 pge-zakn3.le angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHn x0kvdo o(n h,9l.e5nz for a total impo, nx5en90kv o(d. lhnedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the p:.tan x(knoh 3hase angle?hx3(t : kano.n

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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 hi. xpt 5b*m ci*w/tu .hjlr-8and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF .t5rx.cht/p li*8h i jwm-ub*capacitor are 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 capacitor, and a 05kobzp7,j i+ 7.k5luxlj 4 orl.350-H inductor. The circuit is connected 4j7o+ o5zkxl5br j.kp l,il7uto 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*zw:i:x0 /hsf8+ (lcyoyh xm a of capacitive 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 fllxhw+ xz yf0sa (iy*m:h8o/c:ows 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 50o-u1h+pe 4t. gx7x: dyeaobr 6w5(coq -W resistor, a 10-mF capacitor, andxeory1 .(t-cb:a5+ epdx 4o7o6q hgu w a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessas/y4 dfid;9q ary in series with a 500-W resistor for a phase angle ofd / qifys9;4da $40^{\circ}$ 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 = 20xw uul4/m0+ r i tosrnx;jf-cu(0/x:h .0 W, L = 200-mH, C = 10.0 mF. At what frequency should thew xflh0c urmn it(rou/x-j4 s;x+:u/0 circuit be driven in order to have 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 an ac series circuit with 12.0 W resistance, 15.0fg5 hukq)-y 0h W inductive reactance, and 10.0 W capacitive reactance, hkqy-g5 0h)ufwhen 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 isj8t -7.awoqwdz 1vo;k $63^{\circ}$. 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 resistan8 +.nghqweyfo 0 2u(p4omjdo0ce of 30 W. What is the qj0p.gmew08yn2of+ odhu4 ( o 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 50- n:fnzh b.5:c (,eythvW resistor, a 10-mF capacitor, and a 0.t, (nh cvbne5:.:yh fz45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in8 scy ;0smsko4 series?08;ck mosys4 s

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neede7r fsv2p www.qnh/t)*d in series with a 4.7-mF capacitor for a resonant frequency of v*.w fpr2s/hq)w 7tnw 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 needfcl*,s/ 3zun i0i p8oued in series with a 3.7-mH inductor for a resonant frequency of 1000 08ou3lc sni pf *,/zuiHz?

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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 l xw7)x0qz:to in series with a 30-W resistor and a 40-mH coil if the resonant frequency ow0:q)7xtx loz f the circuit is to be 1000 Hz?

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