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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: 游客未登录  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 wb 7aj+lk7km;q+u xe8 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 that the 8 xgj(d )cil2v$emf$ 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 kinx iwt 27rr)lp9d of change on the indl)7xr prw 29tiuced $emf$, 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 thrtcstllut th 4),emo3 ft;:j , 77;vkhrough a loop of wire produces what kind of change ontt l7otrfh l73ht;c:kvs4 u,jm;)et, 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 q 7( q /y5w(qvby6qd 3sn,iubcchange on the induc ,s5u(c6bq7ni d3vw yq(qqby /ed $emf$, 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 maf4hp7yan33/yv v5c o egnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor willx7+i jal4 9mcu be that which tends t 9l4umxic7a +jo 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 horizonr;wjcwmuq 1,)tal table. A bar magnet is held above its center with its north pole pointing down.q )wu wrj1m,;c 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 ta ks4b+.q e/x-zkl8mzzbf )th/ble. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fallh+4 z e8 b)b mtkslkz.z/x/-fqing 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 re*y4mguv c .r n1gop,6zgion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of thecgmzv1g* r,yu6.np4 o 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 re0 x0gn) c9bned4t x9hagion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is thd)c x90t9 x0n hagbe4ne 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 horizl( rr-+ab7:dygxh2cm ontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field ah7bc my+r:d -g2rxl(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-increasi. cu u f wt*ol45yqn;/kegito831pe2g ng current northward. Two tl*/cfeqeu n; pyw3 21uo5k.g8ti4o gcoils of 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-lifw rm3q9-h wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abri- m9l3 hfqw-ove)

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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 rotatedl5 ) sbn ;ut f*,pi7kt,manb.i at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induc.tnft; 5naiub bm ),sp7 k*,iled $emf$ 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 speeh.x o kn/mxo1e+mkd)2 d about an axis whose direction can be varied. In a region where a uxh)2kemmnkx 1+/d . ooniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.r+oyx irn;:k 1
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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 tl7+.(b oivw ckhat 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. 4;7nnjbtsb y 2The $emf$ 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 it(mb29mu p t/ajp zd(ip4g q*64eyn h/n the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rotudhgey *p / 6/panzi4t4 (b(mj 2m9qpd.

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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 cons :5h8ansr .ieo6jep l(tant 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 transfo .tlr5;1 wfio.c shwm;rms

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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 throughk,g l *v;es5ar+0tjtv 60 revolutions each second. The frequency of t;g lv 0v5* kte+asr,tjhe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a de lh.sfehic pm-uef;7f e 3y3*sj 3mzem;(,)vevice 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 devic baa.8:v8j/j2uzpkm a:rp)f ke 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 9txr92 +fden n6,ervm secondary coil contains more loops than the primary coil then it fm n2dev e,t6rnx9r+ 9is 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 than the seconda/ly9ho+*n0e bmn/hb z ry coih/ n+/lmnbbz e0ho*9yl then it 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 podvq90el nmkfj 1v-6*p o.+,hvoecen 4wer 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 circ5l 2yvdye; wr: u)wy*juit,

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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 toaew8uhhw 8a:x9- l/ fo an ideal battery of constant terminal voltage. At the moment contact hxehwua w9f88/ol -a: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 connes/ pk33vnk3 ggcted in series to an ideal battery of constant terminal voltage. At the moment contactk g3/3snkv pg3 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 resistanceg ;wltpt2t,xad. 49f q R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to w, c7lsk/n0 w yh5 vf /-nfoegaj/;.cdan $emf$. 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 gs o)e(;m :cjftime constant for the circuit represents the time required for the current j;ofg m ecs)(: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 i ;i 5clwc(hoe)-9wsarn series to a battery. The battery is suddenly removed from talew;o(ccih- wsr 59) he 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 a(5 wnw6*mkn e(yrt(psame 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 cr lwcz e(+i8g+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 cir+fown0r 0 y2ayq2x 0mbcuit, the curren noa+x00 mrby0 yq2fw2t

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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 lc:u:s gh gatlnkj .));2 k:dfchanges by what factor when the frequency is trn2df:g)c)tguah:ll; k.j s k:ipled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doublee-nfb1zv rs 4fi p1me6-zb2 u;xypg ;3d, the inductive reactance 1x1- p; ;f- 4pur6 zfbv2yzneig b3semof 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 vo/2n046jui,nkyc s -asm1 l dwnltage across an inductor approaches zero, the inductive reactance of that coilacn y -un06lkj1/isw s2, 4dnm

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. cc/nx)z yiq2 fv/. ia*,(hagj In this circuit, the curre.g cqxh /vnyiaij)a(z c,2f/*nt

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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 th.mor /1 yx m(1jkoktq0etu 4-we frequency i1kytu-.qrx( m/0motw4 o kj1es 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 zmz 7-at:xmn ba4n;d 6dero, the capacina bmdd6xa;t 7-4m :nztive 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 aninw :. kn6v:ekgle between the voltages of the inductor and capacitor in a RLC series c6w. kikn:ven: ircuit?

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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 def v 0ahzqfi,e,(ined 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 impedanceap2*)k )enykdjis2( p of the circuit increases if R increases. When iypk (2sei pdknj)2)a*s this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasxum sk-q 3z+w x0;gh:w7z/dsl es 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 incp5nmk1.r sgzvd6m 7i (reases 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 LRCv j lg3f9g68cm series circuit, the resonant frequency of j6l8f v39g gmcthat 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 1k1m7x/ vbvyt s pg/z2AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs who78t2dpz 4 inh3r dobet5 6ywky/ v+;sen

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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 unif4ze);u aakfj-orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of f u)je4;zaa-kthe 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 uniforgri)im ketov/6 f (c2jwh5h f/o/s5)wm magnetic field of 0.20 T. Find the magnetic flux through the loop ow ts wik meo)6iv 5jr2/h(f/5cfgh)/ 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(6jqb //b-y1h,i -9euk d4otu:ted ted7dyyo is rotating in a uniform magnetic field of 0.20 T. Find the magnet/eite dd jh4o /-dq(e6k:7butoyyd, 91 -ybtuic 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 ofy*rxu,wo *6pk 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 from8:-8ezy t::jb:1dmgbfejju d $4.0 \times 10^{-5} \; Wb$ 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 witf)y ap(;4)e mzs( r4kde r+zpqh sides 18 cm. A uniform magnetic field is yzs(fa 4+qm)p drz4 ep(e;)krapplied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and8-f2a1gy0ai wcs xca+ft/i. p 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 c /az8cxhg*7wm ,frzhg3t rn) (z3s:xand 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 horizontal1a cfldfiqyt0liwy8b ) 9/(7jly at a location where the downwl1fi q80j (iafwb/ dty7lc9)y ard component 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 blomc6)f5+xcc f20ets:ax d bz +zk7o:ar that is 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 magnetic fib cm) f5k+x07o exlcas+cz :2:ot6fzdeld 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 of ip(+rsm:: ngf $0.25 \; m^{2}$. 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 :l3lidc it1c) *4ttpo of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its :b1 .gl:criqyp9 *v ea 69auraarmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rr*qrauli geba 1 pa9.:c 96:vypm 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 of 100 turns of wire of8mjeeqk-4 ,jrmc4b 1z 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 .9li.wqk+hisf 38dn)-eeufa construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avfi )nqlsfihu w.a-8+d.ee 39kailable. 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 xt 2;4tts; :iy2jp( gmtcgp1f 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 motdnhbpl*gco*1db * -8 gfvoau(d:)h(gor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistzkygad4h4zx o,7m: z 2ance of 6.00 W. The motor operates on 120 V AC, and when running aozz7 h mdk4,24x gza:yt full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Thhm0jvd oz y4tf3 9;jb)e operating current is 1.0 A. What is the stad y vj4bm9h3);zf0otj rt-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 subde gegb2p koik p59m/.i+51 ppply. The operating current is 1.0 A at full speed. be9ikg1b.dp5p eo5p/i +g2m kWhat 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 interna *ryyi+cl+k +vl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at f+*+ylry kic+v ull 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 transformyrm6,5:m*1s v cnu mgqer 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 tr;mh fz(xp/*c0h 7dnszansformer causes 14 A to flow in the secondary. How many turns are ihc xz/hs7z(d0pf ;m*nn 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 t5 lariy4zgpp603x9v primary if the 24-V secondary has 100vzx4p0g5ip69y3tr l a 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 andd;1xs 1-jy+vw xb54w li1vti6(uw zzm a 2000-turn secondary coil. If the current in the secondary is 3.x-dw4 sy ij zi1lv1ztv6(;m+wbuw1x50 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assu q 4jew)rm6olx5y0m-ihv30 wrh9x7 zl ming 100% efficiency, how many amps at 24 V can flow in the sechi 39m0v ox6wrxwemlzlr 054yj)hq7-ondary?

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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 neonihj(o,q*yorw)o4i;f cf y,) i sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doew,ofyio; ,4)c(r *ohj)qi ifys 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 turns on its sev(4mv b b2bh0npik3 yoh,s- o+-dc ki/condary coil. If 120 V at 2.0 A is applied to the primary, (2hpbso/kmy0 vc 4d3okbih-i + -b,v nwhat 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 cog+dxwj g-jx)a/j r8o:il and 300 turns on its secon+o) rdjjg 8j: gx-a/wxdary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondaryect*wul / sm)) has 200 turns. If the input current at the primary is 100 A, we can expec)ul ts*/em)wc t 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.q y+zaqfj:/ jlg79r g and its secondary has 200 turns. If the input voltage zgj+/alg:r 7f yj q9q.to the primary 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 turns and its sectwiahoqn - 7 ..)0m ih5dqf;noondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional loqw; fih-q.57nma o0.dn iho)t sses)

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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 fgp v.p;d(,bnm + w(ptat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line op vbfwn+t(;gpm, .(d pf 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 120hb6 -knj6qe6cnvl6+pmq)n0m 2o 1pbm V. The voltage is usually stepped up to 4500 V by a tran)66b-6vmq b e+l0n mh 21mcpnkq 6npojsformer and transmitted through a power line of total resistance 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 v6 zooyczm3wrbn iq 6*hb 1 e*5).e6hsholtage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the p5wh hrbe*oz y6hine)6 3b*o 1sqc .mz6ercentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A geo vp9fey.s, qh1x8r bous2- u3nerator produces 100 V at 70 A. In order -x su3, 2r98q 1puoseo.hvfby to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total r-ez1w0 x1lxjd/hgf d+ esistance 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 v-0/1 g1xlwhex f dzj+doltage 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 :qcc9e vu 6z:ka 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at c 9uk6e:qz:cv1000 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 e3r. ek*yr(sbk4 86c39uhj.zc a4bqnw fygd5 be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the oriz4b6ryf kd4ejub53g(*rsan.3 ec w9qk .y8hcginal 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 of07qzc,r,6cw xw9hv cw cm3 ns2)hz 1to 5.0 A. How much energy is stored in the coil'scwcvwc r69nc , h10,m s2zo) xzwh3qt7 magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-1y5 -car4gchu W resistor and an 18-H inductor. What is this circuit's timecaycg-4r 1 5uh 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 cirjsym0hq jr +-9cuit 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 outlytpwvz + 5nyq/12s5a det. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outx njjc08:j0sv: k rdt2let. What is the resistance of the la0cd2 ::xs jt0j vkjrn8mp?

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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 connectez98.x l qh.k;pcm*pubd to a 120-V ac power supply. What is the peak current through theb;8zu q. khclmp *x9p. resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is t r ug+sg3/ve3nd.cf 6fhe power dissipated in t n3d.fu+ v gfe3/g6rsche 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 )ym7zrub 1,a:c*w gtx v(bw6xresistor 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 )c .dk2gg: )t, *ahp7jn fecmj50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W relpqog- gn 1 9,k7d*nazx)ll9(zenqf; sistor 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 oucp4;w( zqk fh9 +h2p r;5wlpff 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 reactanc.pm h*yhli ne0gt818b (zidh s0k.rn(e 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 inrqmt(yq+xhuauy o ,4z ;)15fkductive 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 cisnt;, cb /rhtrn ,1r-.j hj,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-mj s ;r;i/-ks wyu(37d1gfbj3 mswl-zmH inductor when 120 V AC at a frequency of 20 kHz is applie; ; 3jm m-1 r/gz3bwlijs7ss uyd-f(kwd 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, 60.0 Hz soyz xr/ulj4(nj68*r ve urce?

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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 ao 9 nktlm( gc3,n3ro9k(kkn1m 4.7-mF capacitor 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 iebt 2z0 ,xadfhs .wc8,s needed 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 hae,zo os+w nhtak09 w.3ve 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 capaknbnh0d2pf t8i: 3l2,hcfk5 gcitor be 100 W 3hi2:kk d2n8p0 ,tgbc5 fflhn?

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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 thrgb3s wacx9(c6i*s.jf)2c c uxi(u0do ough 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 12.0 W resistance, 15.0 W is6g5ry/w-z l unductive reactance, and 10.0us -/l r5zwg6y 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 1500rp 0joa to1h).d(os/bj8nzf , Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sebzh,)s.1/njao8pjdrf( ot o0ries?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH ok0(x2 ohg 3zicoil, and 1.0-mF capacitzi x 3oog02(khor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what isx0tk ks:izr rd+7m6 62hvtfyk1nt;9 l the impedance at 1000 ks xt2m zr;79vr +k 06idlk:6tyhtf1nHz?

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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 witiy3.u ;ipo:o hc(pz,q mqo,tjr v7 g(pt1y9.ih a 20-mH inductor, what is the phase v:z7y po. h iio9,p1yom.q;3g t(ptu,cirjq( 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 wit3epe.p7 nnnimzr6r9or +-a9h j +*fx jh a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 -en*9emo+rj9rpf a jn36z7x rp +h i.nW at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wio. 035ap-0yuu jtqwi-d9atj qth a 100-W resistor and 15-mH coil to get a total impedance ofa-q.jtt3u5oq-uaijyp90 d 0w 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inwx* ad9d,4c7gjt gqq*ductor at 5000 Hz for a total impedgq,*w cdgxt7 94jaq d*ance 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 rhskai;ww 5*+ er6y5ak esistor at 1.0-MHz for a total impedance of 150 iakw +5;h*y 6skwar5ekW?

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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-m k-k l3cid0rbr,nr p7 4bcgfte5)rr/6F capacitor. What is the impedan5rkpne bbrrci, kt d)4cg3/l6r0f7 -rce at 1000 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-s+3go8 rg) ohfh.ak )mmF capacitor at 1.0 kHz for a total im+3roh))hkg o .mgfas 8pedance 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 kHz f 5lmvl3 m*bwwo)u43;jqm.ulllo t:l l ;6m6x sor a phase angle oll mj:l6m 4l)llblovo q*u33w t.x5msm; 6w u;f $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neocohec 6dtn n 869 fi;e49rhz6eded in series with a 30-W resistor at 1.0 kHz for a total impedanc46dh9zoct ni8 hrecno ;fe966e 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 th m9u/e ;ajbl)hdurl1) mo x/c9e phase m/lxcau9u mh ;er/ 9d))jbo1langle?

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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,z- 8 wvsqxt6v4vx1ra 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecteqs,8t 61xwvva zv-4xrd 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-me+r8 p 8:tmxo mjp4 2f(rzl.msF capacitor, and a 0.350-H inductor. The circuit is connected to a 1208rmxmmoptjepr s.: f(8+ l 4z2-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 ourn-am8c(6ev -.byopt jcll,r /07s 8 dm6pqcf capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected inad p,yn-q076u8ser 6-l/vcmpc. mc to l(j br8 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 angle95r c3 qrs9fmu for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectedu c mq9rr59sf3 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 a8i d(ak6+ tp5fa-iov:p6de awith a 500-W resistor for a phase angle of 5p ft8v(p 6:i6ke dd-+ aaaoai$40^{\circ}$ 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 d5 jpobu v:70lc rmj86has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power l:v65 c7dpor8jbmj 0 utransferred 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 cir1s xdb1u l5n/xs7 )xdncuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when th xdbx u/dn571s1 xsln)e 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 :uyjzpj 3y*; pis $63^{\circ}$. 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 d;jf)(lwwp lvyvh- 4 0W and a resistance of 30 W. What is the h ;lvpl )yw-dfvw4 0(jpower 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 clmukt/ns2 ;wy a8 gcg50d)(an ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,(ua 0ln;gs25 gy/ awnkcd8tm) 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-mpk 9m6;n ivmf4F capacitor and a 15-mH coil in series?p4k;mi 6f9vnm

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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 wiy-;j vxqi+,xz cfw 9ury5*74sy5xaa kth a 4.7-mF capacitor for a resonant frequency 9kay*i u55x + ;va-wqf, cxjyy4r7sx zof 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in seriespr) jk:i v(-e( omfb*h;kdqk4,u pt+p with a 3.7-mH inductor for a resonant freque- dkp j ei h4ktpu:v)mf(+*q;,kbrpo(ncy of 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 placed in series with a 30-W resis0;lu )rrvpqey4 8.m fltor and a 40-mH coil if the resonant frequency opu 0r8.l) rf;q4ylmve f the circuit is to be 1000 Hz?

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