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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux except4r-ov8hgas ;n

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states t*apvk;d d1fdi jbb 6pq-1re/*hat 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 of1g 2uv,)s wkko change on t kv)o,kwg s21uhe 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 kn;t,eu,/fn xproduces what kind of change x, etkn;, /nufon 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 whag ai :5pje3z94jwrh w:t kind of change on the indu rpgjaj :wi34:ez5h 9wced $emf$, 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 r 1u r12d.:nczonj.wo from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced curka*hlvj- j 6k8de6f2xrent in a conductor will be that which t-dv68j hj *x6efl2k kaends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies s()c7nv fbp4o1k7it eut)/c xeqk *v;flat on a horizontal table. A bar magnet is held above its center with its north pole pointincq) k eit4 c)tpo1;b7ukv/(exvf s7*ng 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 m 8syis o5go,/ragnet is held above its /g 5oosr8 y,iscenter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where thebs,v:wc lnb+e- b1op1 magnetic field vector points straight up. The magnetic field vanishes suddeo e 1,n+vbp:c lbswb-1nly. 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 topsya t go3 23oy ,xeud-ul(lq0+ in a region where the magnetic field vector points straight up. The magne0y2xe,y+-(d o luq tou3s3la gtic 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 *nsxqaf,8h/ i8xo hx:mr.ci / horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above/or*s :x/i.nxix8,hcm8h a f q, 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 a3b(dq)c is abg65im /wnd carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on e)/wbisba3 (gi m 6qcd5ither 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 nxh( ie,dfh5 r:orth pole entering first. As the north pole enter5i hedfx: ,h(rs 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 rotates5ur(15 ;sem m967gizph unu+ogb w)ed 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 ofg)9; (u5e7 shounbwmu1 6gzis5erp+m 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 axis u/rggqmaf- t j gk4fh ;5w4y-.whose direction can be varied. In a region where ar. -gwa4f;q gty4j5 -k/gfhum 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 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.i5jcm kds *tk 430586pom wppd:jfr 9m
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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 that2ziaq6e +b,n dmzz2 g7 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. The hpolt)en 0( r616wy d4l0nl/sq jd b3f$emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is mov/yt;kv d wghot l9s:9/ed northward at constant velocity through a magnetic field that points straight down. Make a statew//d ; t9lkhgo 9ty:svment 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 cont be 8-vg7l*f+xsic3/bkhes p7:mu6rstant 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 transform;tbl/o)- fgtw*cz( tz s

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatesm/ohf(j5azqw4u /z1+ebev; w, 4qj x t through 60 revolutions each second. The frequency of thz,h/boaw (4v/e zuq 5qfme;jwj1+ x4 te $emf$ 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 ushu)u eavxl2./ qqd.+ ybu72mmed 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 d.yf sm: b-,cl5awt3ikevice 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(htji-.3gd-nh (,58rqi *yr ww qwimm coil contains more loops than the primary coil then,d-8g mwiqh-qyrw i(ijw*hm tn35.r( 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 prv r)r soz na-)q2jk2l4imary coil contains more loops than the secondary coil then 2 azjq )klrvn- 2o)r4sit 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 powern9kg 3*wpmk.w0enl :p 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 ciretl*rkd), 3 bkcuit,

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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 indug ud o)k;zn;p0ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with t;gpu)od 0n; kzhe 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 cu d,ps jd1lo;fv1srm/5d8 .vhonnected in series to an ideal battery of constant terminal voltage. At the moment contact is madejv8dv r1d,;5sfm/ opshd1ul . 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 inducf*pa,;-d *i4vut oxgdqc ;ox(tance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista u30 vxwvh79fhnce 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 7 9fsmx-e7uu tare connected in series to a battery. The time constant for the circuit represents the ti 9e7s7txfm-uu me 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 connected in series to a batterybp u qpakk9q,nb 7os+771xyj;. The battery is suddenly removed from the circuit. The time constant for of the circui kajq sbn7 +kxpq,971up b7yo;t 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 ;2e9saqzkf og mnyauv:)vm6 qr)0k /0same 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 c ft-n-rrd2)59wrnks iqbpe59 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 (tie65 en4ht:zgs l-az*e o 3gg)0rut to an AC power supply. In this circuit, the currentteg-46n0i 3ea gtusg5zrh e *) :lo(tz

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reacta /- 3dld*, ugmgviou.pnce in an ac circuit changes by what factor when the frequency is tripp, .m- odgl/u*di 3gvuled?

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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 acrid0hm r.9x 2jfxjq9k;oss an inductor is doubled, the inductive reactance q9;x9hd 0fjk.j i r2xmof 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 u u 7r6t; b.w9)nq adz+rrw6dxan inductor approaches zero, the inductive reacr6n+qdtb)zxw9d 76uru ; .wartance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In q x*n 1ffm;(cyogohb+2qa+f 1this circuit, the curre+ 1yofa(om+b g1ff n ;x2hc*qqnt

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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 fact-v7 hca .cedwt7r 03veor when the frequency isc dvc7aw.v eh et0r-37 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 voltag:7.(m4o0f zhvfrwys 1-futoqbp a ,.tgz;ie0e across a capacitor approaches zero, the capacitive reactance of that capae; ,fsq:0vpb1w0omht.ufr iao7g zft-4 .(yzcitor

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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 voltageii igzh, 5 vk2km5.trtp8t, kk vb-:5es of the inductor and capacitor in a RLC se. -pk5b:g v8tk2mkv5h,ii5t,it rz ek ries 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 aazzjd uo(29ux3glb-:n RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit zk:zk w8 k*m)vincreases if R increases. When is this stk)8mwz*: kv zkatement 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 in/wluo tfx+la8h,3fe ,cgql8 7creases 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 ino,hyzd4 - h0aycreases 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 an:.8 h;jpvrdcapacitance both double in an LRC series circuit, the resonant frequency of that circuiha;p :8n rjvd.t 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 appliedch/l gpj ;+/z8ma)tiv 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 serie p:(fzxpc f c8bm56d:us RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotat g4 yqodwy(bta6ex9j ,0) hl*xing in a uniform magnetic field of 0.20 T. Find the magnetic flux throug,tdah6x9byoxwl*4j0 (eg)qy h the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneelcxhz83 qf -nb .5exc5j3:myq6 nu(ktic field of 0.20 T. Find the magnetic flux through the loop when the plane of the locnq zbj6 5.(x3:k-f umyq3le5 hexnc 8op 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( z-wm-: hgeq uotjur)ea 86l, in a uniform magnetic field of 0.20 T. Find the mahe: -gozm 8,e wujl)a rt(-qu6gnetic 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 adjustable singlet2y r -f1ex(jxza. c(c d6dp5e 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 froml 9uqu8b )*l ssx3bji:g atu70 $4.0 \times 10^{-5} \; Wb$ 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 sides 18 cm. z4jyckfz/;p . 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 4fpjc yk/z .z;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 gy,mlmd (d2)s/c/x oo7 9ch 3mvm76bmyouj.x 15 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 wjfa4s6 2,*rly0i*n d6 x ugvy$0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where the *bt qt evt0scwmp*107downwp te1 vb*0wc0qttm7 *sard 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 bar that is 2.0 mm: v u0a:5 egnzo:s0io long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a coe:0:no 5 i smauozg:0vnstant 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 c6xlr3z+g oc vls10lp5 mr3p*cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire oqt7,ytf5wxdwm ,-z i m+y+4o rf area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cmu /g:h7m ws4nt long and 8 cm wide. The armature rotates at 1200 rpm about an axis paralle/h:g 7 utnw4sml 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 w yb-y h:0m)qhrfoo q3cg+m :tina/39of 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 wist.r i ,(m vgr zqb7a3f-hlioe65 cw:(eh to construct a simple AC generator with an output of 12 V maximum when rotated af 5g,ercai-7lhroti3e (.zv: b m(qw6t 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 with cl:l .c0y od -b5rywl-url34 d/lq5gx 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 motox qr ks(3(akh/r operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opeks+mncphb. 6gp5az87 2yzce;rates on 120 V AC, and when running at full speed it generates a n zkyhp6b;.8egz ca ms7pc52+ 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 conned mcepqz(2..a:ig u5p cted to a 24-V power supply. The operating current is 1.0 A. What is the guac5 .idp.p qmz:2(estart-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 laa7- 3wfk9 sda 24-V power supply. The operating a97 lwk-d3f sacurrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 8ylr vg91h * xj2jbw3q6.0 W is connected to a 24-V power supply. The operating current is 1.0 A a812gbjqxh 3* vj lw9ryt 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 t(+rddkwx9; s3 z+ uaquo reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flo1i4l) 8eonibmd2g 7iow in the secondary. How many turns areomgi8dil7)4 ie o1nb2 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 if the 24-V se fk2dc545nc ru*)xk r e(oiq*qcondary hasqquorcn 5k45f(*x )c rd ke2i* 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 onpo14x 2 (hnofn+x/v-nmch5 t f a 500-turn primary coil and a 2000-turn secondary coil. If the current in the+2 nnfhn5co vonhx1p t/-x( 4m secondary is 3.0 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 primk lmowc 8l8f*0ary of a transformer. Assuming 100% efficiency, how kflo8m*w l80 cmany amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Thi:09/gmi0s5jgnm k ta e primary coil operates on 120 V. What does 0sk/ 09j tmgng:m5iiathe 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 im:m11 l wfpa2vts secondary coil. If 120 V at 2.0 A is applied to the primary, what wv:pm2m l1f1 avoltage 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 p zy6+qj (uj.m(pjo nzki.bx;8rimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cuqpyjj ;n .6k.i8z(uj( oxmbz+rrent 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 secondaav0 5ki28 mffx1yuh 0v:9 xdzhukfz,(ry has 200 turns. If the input current at the primary is 100 A, we can expect the v89uffh0fkviz a0u: y, (2h xzmdxk15output 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 turnsbn ,lo4n0f ik8. If the input voltage to the primary is 100 Vflbn 084o, ink, 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 secondary ha3980 ous0erbrwsu )dis 200 turns. If the power input to the primary is 100 W, we can expect d3)u0 8 wsbr0orsie9uthe 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 cuz0d*utnq*16l d kgloa/ ;t:dqnek88j rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and 8tl z1 ql g;6aedno*u:d0k8 t d*jnk/qtransmitted 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 us8,/h:bxgktu fually stepped up to 4500 V by a transformer and trhfxb t, :8k/ugansmitted 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 currenoyzup 8pt*yivbhn2 +yw *v .(+nm6 m:mt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lim6h+nwp* i :y2.*b+ym ztn(oyvm8 vupne of total resistance 1.0 W. Find the percentage 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 resistancet;qei2nxeg517 zgo9lhqa,9 d of 0.60 W. A generator produces ae,i7o9;dt 2q 1h5 q9 gxzgeln100 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 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 resistanceo 9i gtig- )4ktj41spo of 0.60 W. A generator pro4t14) gok 9p-isjitgoduces 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 powe2k bcaa x j;vczzhf,6hl +4.,rr would be lost if t+.c6xhlh;a vzzac4 2fr k,,j bhe power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line ppy8 fjw0 gf*1with resistance of 0.60 W. To what voltage must the generator output be stepped up with a y8*f 0fw1pgp jtransformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5 63e-ii/falm)u r*o) wusgll-.0 A. How much energy is stored in the coil's mmlsi)oli6 r)--u3/ ea flg w*uagnetic 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 resistor and an 18-H inductor. What is thzokah)9.;lr;7jxi hwo gkz -5is circuit's time il75wgj-zkz;oakx;h9 .rho ) 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 wjq7 a qo,k,wd0z9. wxcircuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. ps)z*)y6 cev bWhat 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 e+,moo0m7fo l120-V AC outlet. What is the resistance of the lao0mfomo7 , le+mp?

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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 tha4(mwoyydf8 3c hc21o a 120-V ac power supply. What is the peak current through the resist (hhc 2dw yy8ac41mf3oor?

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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 toaplvne8x+) btr-7fxh , vn3t567p qey a 120-V ac power supply. What is the power dissipated in tthq37x rn+y8-l fv7 5n6txapp,ee)bvhe 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 rp(. 4iqbleio 2 h3mp,k0xb)mct 5s1sa esistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is 7tcu5+rruvin gls86. $I = 0.80 \sin (240 t)$. 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 50-7 va i;t4gr*u f2k a726qmrincW 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-mH inductor at tb6uhv2f9)d yr -q5 b u97uitr60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50r1-hf 9s6vx v i/s2obi-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 reac5qzj(a2nx4u e +b:brw6dhdnu+7 mtt 6tance?

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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 f 5ffg x7ll9l*vtfr* w2)9kpdaor 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 inductorh75z*q3c/iq4f.y pi buxgfx* when 120 V AC at a frequency of 20 kHz is3 x*4 q.if /piq5hy *bczug7fx applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz source36k hbmoq;t7yq gbpb- ( r+5w(cro:d w?

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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. eh.gz 0utg/jluv, lmusbm.h4 j850 c87-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 is needed to have 50 W of capacitive reactance at 10 k2 r7vxu8o0r5w v p5ayve2xj/)e0jd abHz?

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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 capacitx+*ztndkrm//1 a kt2ior 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 e: i)rirmyi(+w+b k+ ebe 100 W?i+irrme)( y+ib: kew+

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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 and *g qo6ly7y *f iqpp)i8/zwaj 85.0 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 rekm 5cg.2xtd 6rsistance, 15.0 W inductive reactax 2 tdgmckr5.6nce, and 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 impedi+ ti.jm-r 9vkance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri9t-km r.jv i+ies?

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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 coil, *8lr (07ndx5y *f9g mnwle pxcand 1.0-mF capacitor are connecgnx( y*d e m7xpl*859 rncl0wfted 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-mHc*5ot ,db)u gebr,g. e inductor, what is the impedance,bto5b. e*cu,g gred) 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 sey yi9 cr2sg7:s9wr i2aries with a 20-mH inductor, what is the phase angle at 10y2:y c2r9 i9g7asrisw00 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-mzd 4 ;*rhw .tr6ln1 rjqccfei4r4+gt2H coil and 1.0-mF capacitor for aj64+nt2rf t gi.z4dhr c r* ce1w;lq4r 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 capacitances is needed in series with a 100-W resistor aou e+5+z ao4 d;uhan)rnd 15-mH cn5z oe ;dh+rau)o4au+oil to get a total 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 mustj+uc6 5 vmo- u+qbrtr4 be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 jt+m ocuvbr45 +u-q6 rW?

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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 ouc : ogajfo1sz 48x*.for a total impedance of 15g4 ofo a*1xs:zu c8jo.0 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-mt) oh.byg5m97 x:ee;oncu+be F capacitor. What is the impedance at 10007geo9monc.ybx +;5uee: th)b 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 neede m lfov.96i-her,x i)uys7 hw*d in series with a 10-mF capacitor at 1.0 kHz for a total i 7m.xuio9 heh ,sv 6rfy)*-iwlmpedance 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 :as6rc(n1lc7oijg zrykk 3j-r( l:a /at 1.0 kHz for a phase angle aj37 o6 rzc:rs nalk g(r(lk 1yci-j:/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 wikjklnpze/v(gi +g7a hw6r 3,6th a 30-W resistor at 1.0 kHz for a total imp p+g7e(l/a w 3hvj,krk6g6nizedance 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 p6f i 8yzh1qbv c3a.-xd,ubh .a 100-mF capacitor at 120 Hz. What is the phase83 a zdcxh fv .qp1,ibh-bu.y6 angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V ar av8)n0;8mcghz zdzn* aba(/.sl2s ond 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriv;.8z nahd/ 02szl mca(b)*sg onar8zes?

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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,smv *bgia;w4sd o 248x a 10.0-mF capacitor, and a 0.350-H inductor. Thssm8i;ow 4a2 xbg4d *ve circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, aljqa) q3 3pd -b3qwc,mnd an inductor of inductive reactance 30 W are connected in seriepj mb3q)-c q,la qdw33s to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a seri0s zd:pt3usl,a, k8 ines RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppllis80,ntazd ,u:3k sp y?

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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 3lx)uu3;) ,gc+gwdpygdb;ud series with a 500-W resistor for a phase angle of dw ;bc3ypud) 3xg ,gug +d)lu;$40^{\circ}$ 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 = 200-mH, C = 10.0q:8h; pab,cjth b-qslv ;)/nc mF. At what frequency should the circuit be driven in order to; tb8lvqp-hj) qs :a cc;,n/bh 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 cir/ ,ozepcmer*g7py47n i 4t,b ocuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is on r4 etpze4ogy7ip , /mc*b,7connected 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 ; 19 slr,rs ny dktjpzr+zb0p0r /u6o:AC circuit 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 im0kgln j 9)c o2/)s cxez(f*lvppedance of 60 W and a resistance of 30 W. What is theflj(k c)z *n xpec)sgv/02lo9 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 circui y6iodnj*dkdm1 8u6.*uk* ylg t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when coinm d1u *yy6l* kd*gk8j6du.onnected 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 i f6x/yaj1ihq8p;st ql,gb : i8n series?y:g8/hit ia;fb,px js68l1 qq

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant fre:muv4(oj ;1-rcqqpdm ,z7 ytr q*axhu3. +lxvquency of dq u-pcu(+hm7yq.v: r 3l;jtxrm4z x*1aqvo, 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 series with a 3.7-mH inductor for a reshw 9,oep x7ms,onant frequxwhomp ,se, 79ency 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 resistor and a 40-mH (ng1wf o(wz90el:oj lk2,jprcoil if the resonant freq ewg9:z lo((w0ol,kjfr n 12jpuency of the circuit is to be 1000 Hz?

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