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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 nbh 2yy,d9vflppeg. (x 99e :rare units 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 induction states tg./ c 9wut:evzhat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change +t (xsylx4z9xon the inducedt( x+4ys xlxz9 $emf$, 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 magsq,+)jyb/ ol)cnk aj1netic field through a loop of wire produces whatjn/ qoc)bls),1ak y+j 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 change on the indau *rmczgc5 0q.6xtj ,u gxum* 0j. c6zqcr5ta,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 from a m7 ruik7j i 1y6v4nx)vyagnetic 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 l8kbho8v.t ,(ho yy(re aw, the direction of an induced current in a conductor will be that which tends to produce which of (eh88y y r h,okv.(obtthe 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 mr; sbx 7eb ci1-ok zmd0+*)lbqagnet is held above its center wit0*o 7d mcb; s i)r1e-xbzqb+klh 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 b 2kf 2obwd, flvym1/7q-nyxgvf60(b l.t g2k dar magnet is held above its center with its north pole pointing down, and released. As it approaches the c1 6dgy bv(gn-q.dl ,mfxo2y/t 2fwvf0 k72k lboil, 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 fiele iy k93m+z9/8ba0h esx:oswpd vector points straight up. The magnetic s bp9me0:k9xh / 8swo+ 3ieyazfield vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magfi0gd ml8(3x 11iekdc)g l5 r0h-fblo g+i0nanetic field vector poirhf+08) ag ikno0gf db x(1lg-0di5cl3i1mel nts straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field 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 wk(q .f8n,xkuatz8v,4 lvh-gfhere the magnetic field points straight down. The magnetic field disappearx h avzvf48(kk8gu,.l,ntqf-s 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 c 3j9s.*8lyksgy bh .w:hsxj7 garries an ever-increasing current northward. Two coils ojs. 9*h:j ygl.swxg3shb78 yk f wire lie 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 en.bp6e *ad9e ibm*dei7 tering first. As the northi6e7ad bpmi*.e *e9db 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 opada u0-c4e; .5nvkj 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 axo-e 0kj;.a c5 naudvp4is 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 q 1sesbk3g n2/angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fiene3sg 2s1kq b/ld points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.88- 8 / mnt9-dag /nm pcrq(nniz/qlrb
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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 thatv mt::n7x-rwsmtj+ 3 pa+ o9kl an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. -oi fdu+6)i 0erkqrsk (k0c+jrbggi.9 p,r2m 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 e8q55e0 cht ohg8byk6 4 ,yashe/pjdxjs r8c 24ast-west direction) is moved northward at constant velociesh2ajq e kt6/b h508 ,hys5occjpr4 xy gd884ty 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 constant angular velocityh v 6e5tba0 5d5lgr,a+bvljijvh 1i0 ) $\omega$ 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 transfotwp f,rvl2aa o 0m ,08ra7ls8lrms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. Ths5s/ym0slc a/fv+ jmoy:/t0y1 f;z/xlxw -sle frequency of thczss0s a1jt sf/ l// wv0x/m:; m+5oyf-yxllye $emf$ 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 u*6 wjf)t9 scnpsed 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 devcfc epntv)aj6 ;c/ ) jv44k+k8hron/iice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil cont 1nepd 6fn(0qoqog-j3ains more loops than the primary coil tf0p1oj( eoqg3d6 nq- nhen 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 th gay5ol,5cwp (e primary coil contains more loops than the secondary coil then it is 5(wygo5 pa,cla

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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 2kch l0g4k o46u*+zey svph;v 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 circuit,qzvqm*s )(9hj yd2b3 x

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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 ba4ih3gh ik(i x v8i.zt;ttery of constan8gh 3h;(zt ii4i.vxki t terminal voltage. At the 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 :qcqr(uxk4 2h z fk;:dideal battery of constant terminal voltage. At the moment contact is made with the battq2u4dc:f (rhkk ;:x qzery, 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 cq(ble5 wz in.* sic+(xonnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected 4e4 eoei8y 9cqto 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 ah had lh+pnt(8c5 - w3vmb.je-re connected in series to a battery. The time constant for na ( . b-mwe8c3h-dt lpvjhh5+the circuit represents the time required 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 .wu* y 6uyb glui75me(connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to(*7iy bmuge ylu6uw .5 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 exck6t q 7zn 32(b0wfknpqept:

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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 c2pozewqujvx xw4 ;j0 i)l8(l;ircuit, 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 /) ybnkc46 muicircuit, the curren)m bcuiky 6/4nt

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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 whenj zn8/.pj)zh udjj*u; the frequency is triple ;zpj.jnhdz8)j /uu j*d?

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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 act5b38c)cwzc:xnuv 6 nross an inductor is doubled, the inductive react3tucnw n:5) c8z vx6bcance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches.+ pigz (cke/v)tyms/ zero, the inductive reactance of that c/+gc pvyei. mz/ts)(koil

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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 :rroh7k8rp *iix z..65w crgm supply. In this circuit, the currenti5w m6.87zkorrg p*:irx .rh c

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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 factor when the fr soc4 8n3ibd(--2zewwltt;fpequency is c(e o2 3 ;wwsbzid -n8-tl4ptftripled?

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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 cap3nnwe*7ts e*k acitor approaches zero, the capacw *tn3se7*nekitive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and 2mba3f9 si,jk+1ic/eeo njrj1y a: i)capacitor in a RLC series cibra,k3/mi + i1 soce1:ye njijfj 2)a9rcuit?

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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 isdgs 4*j63qj il(bfg 0l 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 thugy7 n8e z8en,ui9k. te circuit increases if R increases. When , nn89yeu7uz.ie8tg k is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circjt-kr0lf7:zp n2 3quguit. The impedance 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 impedance of u -ala-ye) b8-joxx6dthe 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 capaciecvwo ,d 1hr m/u*h+c;cs-(-a 5ogfqqtance both double in an LRC series circuit, the resonan-o- cesfoq +hg;/a1m*ud5 wcc(,rv qht frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonancelypq0rv7 k05gf345 1cuh ouv m,

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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 occht* ) f0kpa51ssy/y3mb6m bps urs 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 fie0y3l pz ok)oa)ld of 0.20 T. Find the magnetic flux through the loop when thya)0 po)k zlo3e 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 bhp. npb2f6 rc pg5:dt*ibv72uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are rn2pcbdvt*bph7fp5. igb26 :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 rdgzg08j5i) np.t;l,e :bd ely otating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie ne g.,5pb zj )dt0glley:;d8ild 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 t-ss09z(ic 8yyq2u3h/ hvbdj 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 coi 5m :y e)sm1c3jcs5c)pffspm:l 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 square frame with sidb k-j3v b3yf 5)wkexl6r;* 1heslpsv4es 18 cm. A uniform 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 averagw vke3 b65y4l) 1bv3kheprsjs*l- x ;fe 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 tuthel7pk43 *9uwm;tn arns 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 anl86fo hbzee;. d 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 o;wz zi.f3*z yp1n 4uqof 60 m flies horizontally at a location where the downward component of the Earth'syzqf.*4poz3uz 1; ni w 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 a( b r/is3fzq-dni+a(-bcu1 wpt a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends1d/rfqiu an pi--wbb3+( s( cz 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-sectiontnp0vq6kh9a)nk i:ja5o t 2-pal 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 oizz b fz7g;(9xslp26hf 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 :;-p3enofgpar :l79n ibi q;fek 8 1iorectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicularn- ob9g qanrei:i1fpik:pe8 ;37 ;of l 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 turzf45sjmf54 /;nmsep mns 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 an output of 12 dp(c g(60tbw7as9zy wmsz)5 nV ma)7sa ty gd(b9sw6zwz m05c pn(ximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wiv mtiwj2c)gwcy74 dh ,3d(lc1th 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 oqpf3ikmyjg n,9 36o (zperates 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 -rrd2;bk on)toperates on 120 V AC, and when running at full speed it genk2-od )r;rtnb erates 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 connv0 cso 86qwm 5e.qq-xpected to a 24-V power supply. The operating current is 1.0 A. What is the start-up 8x.w-v sqp6e0qc q5mocurrent?

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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 2t8 u 6 j m5ehpz3 bo/6zhumwr9wq7 iv:n6xki(power supply. The operating current is 1.0 A at full speed. What is the 5wi7uw:ibz8vz966u he j( o2k3tmnxqh6r/mpback $emf$ 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 (z,xrk3-ykx+q/qgv 3 rsrl x (power supply. The operating current is 1.0 A at full speed. What is-,3qr vsg( q+lyxz/x(kxr3rk 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 primary voltagesbb7vx: bc;kza5r5v 7 8j;xhr of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in riy.wi o4 jf9bu9xa8 :fs+ e*qd/0t:a9hkgzm the secondary. How many turns are in the secon*9uq8.zg f4wd fr/0:sa9ax9t himb eoj+ k:iydary?

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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-V*b ti3 gq3cv ;m0ftw0z se3;tvt*f 3 gb 0i0czmqwcondary 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-turn primary coil and a 2000-turn secondary coi5djzi5 b*4mty xsc7j0l. If the current in the secondary is 3.0 A, what is thex 4smbtcjd07 5izyj5 * 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 transfrb 35/9mpgt )evs tma)ormer. Assuming 100% efficiency, how many amps at 24 V can flow in 5t /3pmatbv )m9)gs rethe 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 vojohq d8e0v *7v760/bfa wxn a neon sign transformer provides 7500 V at 10.0 mA. The primary coil en7djvw7*0v6 qo 8 vofhx/0aboperates 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 tv uw l0mx+tro7, y.4zhas 60 turns on its primary coil and 300 turns on its secondary coiz4+w.t rl mx 7u0,vyotl. 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 coy(1tp8mdklf2b2 mgo5fy)y)rtb:odt ;sy : ;gil and 300 turns on its secondary co( sfo2my:;kgbyd5yt 1 d)8ryf)o;tg l2p bm:til. 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 100 turns and its secondary has at4g.h a yp):c19 app y2kf.aq200 turns. If the input current at the primary is 100 A, we can expect the ou. c t 4agaf.pph p9:y1qy2)kaatput 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 n7 :ziy / gcpyd1.-0xyr l/llg200 turns. If the input voltage to the prima z :cgng1 0yld7 i/rlyl-y.p/xry is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 y xqy+;+zja9r turns and its secondary has 200 turns. If the power inpyj+y9;raq+ zx ut to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vox x)f;*(w 6jg/rcosda t8uqe6ltage is usually stepped up to 4500 V by a tr*dax68)f6;t /wsc xrqg ej o(uansformer 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. hrjj e6u ffx.olzs y5 4om(.:,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.o:f 6eh5 ., ofuxrjlmys z4(j 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 7* l:lr wji2:if;vicx60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the tra illwf*::;rc xviji27nsmission 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 8k3o)zbo4am-9l thuw50 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, the voltage is stepped up wit 93u wbh-)8k az4mtoolh 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 totbdzphutb)j91ww8zx;mt70 q 6al resistance of 0.60 W. A generator producet9zt80b pb76uxw w1dmqj) z; hs 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 beeb k.3;16x og f /suyy9kfydd; lost if the pow/ y1 gesoudb9y3;k; x.fykd6f er were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to bn 5pp yqsd1xct) xa)58e 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 0.0np 1t8xay)x d)qpc5s5 10% 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 energynnija nl 1)71z is stored in the coil's ma i1an7j)lz nn1gnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resis26jcq m1 q-aeqzjn 8c*tor and an 18-H inductor. What is this circuit's timc8 qcqjz*enmja 2-q16e constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms * j i *ryly jp c)6gu(aps)c0y6z5r.tdvoltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curr8 mmbe )g2kv*dox0l a;m1c62,cfljp h z 8g1mjent?

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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 xkpxq-4l:w7g0w: iyzthe resistance of the lamp?7zl:w:px gx w-y 04qki

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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 p2dn1k : ngn5rteak current through the gknn1r2t n :d5resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What iog l/4q4,fdzc v ;u;vvs the power dissipated in the resisc/g df,v;vlu;q4 v4z otor?

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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-othwf( 9/ u2zn n2vp -qj.z l00e,bmmgW resistor 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- ljf9zf3*wkjz baa*)8W 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 resia uf-k (j .+qnq6ypnopq( :ddd* ukl)0stor 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 ofd0 snprg x oqs6g)wh9thc(4v**9io 6q a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive rwro;9ya. bohr:/dar cc,hm - )eactance 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 a 14.0-mH coil have 14.0 W of inductive rea;hmp4b3 -y6,c ljqcxpctance?

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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 fo 8jji;c o s3z+am34syfr 157 W of inductive 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 a7jmh4: jlgef+heirc2li v /)0t a frequency of 20 kHz is ap4v0 jfle7+/ch) :ihr2mlji geplied 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 1108:.n j8pxr uxh41rhw o-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 wvatjvm+s/yc 6-szb )* v2 xf5capacitor 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 needed to have 50 W of capacitig uofe d+3t8y+ve 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;uengbv/::j djnf t(; i07gn u-mF 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 capacitor be 100 Wh2- 8q2uaw0zycch:b n -2ccw0hnazyu 2bqh8: ?

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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 throu9 hn*7ca ad5lqgh 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 12ij -fxh/5p;rjw +ep)u a/mbs2 .0 W resistance, 15.0 W inductive reactance, and 10.0 W capac aiexhum) j/ +/fp5;b2rpjs w-itive 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 imped/m/j nyl.376ufr )jap sn3ooxance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in jyr/o f )7os6n.paux/jm3 3n lseries?

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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 an1np ns)-etk-hgle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecn1ktn)- heps -ted 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 connectedq d)xk6r0/ei y in series with a 20-mH inductor, what is the impedance at 1000 Hzd/i0k ry6q xe)?

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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 indyp8tsbb all .3a )8db6uctor, what is the phase angle at 1000 H)bl y3at bb86.8saldp z?

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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 infu x1eo: sf*5c a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impf51fco *:xsue edance 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*yg g 1 xdf)wy,9xdf:vcs)lc4apacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W a1f )g 4cv)fsyxgw :l*dc9xd y,t 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 500aqh1p 9p1ke)l -qiu2vtns2o3 0 Hz for a total imp p q-e1)9n2qs2vilh3ua1ptok edance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz forft/hg 5-kpxj zslw51, a total i 5g-z /fwx pkjhl,t15smpedance 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-mF capacitor. Whagx6w-j,:pn m ot is the impedance at gojm -wx:,6np1000 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 v 2. 6jqvb1uw)rds)mqh5llp7 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?bulh2m 1rs)v )wlqj6dp .qv57

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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 kHz tnc6s,it pv;h+ ed.sty:o u ;)for a phase ang;itstnsp.co+h:uv te6 , dy ;)le 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 insshk0a+3( nh;prjv fj em/a)7 series with a 30-W resistor at 1.0 kHz for a total impafamp ) h70rss3jhek+v;/nj (edance 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 capackw -e8byy paw(eat74 ;itor at 120 Hz. What is the phase angp w7(;-abyea k4ey8 twle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH co;;e, anlgz+ fi ;pq:klil, and 1.0-mFkgzn;eq , ;+; aliflp: 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 consists8rmjjt16d)y,w0n v vt of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power sup)t1r8 yjv v,jtndw m60ply. 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 reactance 30 W, a-3v6e c p to pkrq imxk:lokf314056ylnd an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows i:1ki3my ckolp650xo rq- fvk6 e 4t3pln 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 cont0fb cwjm 9kz/r9)v 5sqaining a 50-W resistor, a 10-mF capacitor, and a 0.45/b)js fr99k0vzcqmw5 -H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a ph s pr87suno;tqx (78aoase angle of usxpoa778 8 otn;rs(q$40^{\circ}$ 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 =5kq kq4o9s jptrpcl29 tcu55+ 200-mH, C = 10.0 mF. At what frequency should the circuit be driven s p945 5ot2lt cj kr9ck+pq5uqin 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 :baxdxi(; 4qz ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circu( xdx: q4iz;abit 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 ch:mlju2 sc kq4la m8vjs+1 l*,ircuit 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 an impedance of 60 W andb8 / acvh-e5aim(i9zn a resistance of 30 W. What is tvi/hz-nmi 8 (9ba e5cahe 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 forj p 8eku2 8r209pjcz1akty/n* 2 vrydc a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?89 jp2pa k8eu rjvryncc2d y2kt01z /*

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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 frequenmzyv2c 4p+ .szcy of a 1.0-mF capacitor and a 15-mH coil in series?. zvp+scyz4m2

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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 *rgrwq 5mt 8hwoh2d(2with a 4.7-mF capacitor for a resonant frequency of q(2 285odghwrrw*hmt10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a res ypb rpav*(r),k(bc;a onant frequency of 100 r(r; k)a,y*bva cbpp(0 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 mu :fp u+ak,gpwg/4ap j(st be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of theapja p(4p ,gg:fku+ w/ circuit is to be 1000 Hz?

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