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习题练习:Physics Unit20: Magnetism



 作者: admin发布日期: 2022-08-20 20:38   总分: 81分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 20:38  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  
  If the north poles of two bar magnets are brout 5 mrjs9q s9us3)uoee5p/wd 4ght close to each other, the magnets will5 m9ows/3des549 tue srq)upj

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the south pole of one bar magnet ip fqoq4b ,e(/xs brought near the north pole of a second bar magnet, the two magnets pbf(,qx e/4oqwill

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a bar magnet is divided into qm6c76v w4fkr gh-sbq1e4e i2 two equal pieces,

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Earth's geographic North Pole is magnxis27lhuqv/ao p61u 9etically a

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The south pole of a magnet poin:,e yu . qrk0ge;2orjgts toward the Earth's

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric current produj:f53i*j- *e jemjmeyces

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is correc6) xzey,d++/u buid-g(ogm)op.rwza t?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A vertical wire carries a current straight down. To the easthnsnd* 7 61ss+6b mby aogg8,u of this wire, the magnetic field poin 6n *+1g7bs,d yasnmhosb68ugts

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal wire carries a current straight toward you. From your point of : ; e+auw3)xox7ohte p.-tbbs view, the magnetic field caused by this currsxe3+ )b. pwet7 -:bx tooahu;ent

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A current carrying loop of wire lies flat on a table top. When viewe 23- gkz8umk. q/s5nml(ux zggd from above, the current moves around the loop in a counterclockwise xg/8-kn2sgz3g .5ul( kzummq sense. What is the direction of the magnetic field caused by this current, outside the loop? The magnetic field

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A current carrying circular loop of wire lies flat on a table t.j ;g.ygwzb 2u2i2 orbop. When viewed from above, the current moves around the loop in a counterclockwise sense. What is the direction of the magnetic field cau2z2 gbo y2rjiu;g..w bsed by this current, inside the loop? The magnetic field

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The SI unit of magnetic field,gqc,rnt: 98 /cjfvg y is the

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  1 T is equivalent tomu+h9u 7yeb 63byqns+

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The direction of the fo,f +m cxmj.:esrce on a current-carrying wire in a magnetic field is described by which jm ex.,c+ fm:sof the following?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The force on a current-carrying wire in a magnetic field is trst,j wseqy- v6i+j w1j3.7 cndha+4dhe strongest when

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The force on a current-carrying wire in fck+itwunp 54w9p co/md24r .ma f0tj*k:4da a magnetic field is equal to zero when

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A vertical wire carries a current st8p/the1q o.dv-xy en7 raight up in a region where the magnetic field vector points due north. What is the direction of the result- oy/d1 xvt7eph qne.8ing force on this current?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle moves and experiencev - 0ko;gau2pas no magnetic force. From this we can conclude vapu 2aog-k;0that

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle moves with a constant speed through a rel78:80x8ob uensj svvgion where a uniform magnetic field is present. If the magnetic field points straight upward, the 0s v8e: ju88xbs 7ovnlmagnetic force acting on this particle will be maximum when the particle moves

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle movesyf(,vv- ke tgcb-*a xiq sd4.( across a constant magnetic field. The magnetic force on this 4e(ds k,y.vabx c* g(vi-t-qf particle

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle is injected into a uniform magnetic field suchsruz m9m8 -nk/gy ,ee6 that its velocity vector is perpendicular to the magnetic fie-69u,enr 8zgm k e/mysld vector. Ignoring the particle's weight, the particle will

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charged particle is observed traveling in a circular path in a unvz * s*/dzzu)tiform magnetic field. If the particle had been traveling twice as fast, the rtz z) */vuds*zadius of the circular path would be

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A particle carrying a charge of +e travels in a circular path in a uns)(rlq)vbh+bcbg iuq19o- (2jk:ytw-o (e xoiform magnetic field. If instead the particle carried a char(cb(2+s -uh i v rbl9-wobqtg:)1qxkyjo)eo (ge of +2e, the radius of the circular path would have been

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a particular instant, wroa;o) f7pcz( b;w*h an electron moves eastward at speed V in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it i;h)paf7 cbo;(zw orw* s

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron has an initial velocity to the south bl (sp :cwfc:.k)lis0u ut is observed to curve upward l)k:ci:u f .(0pcs wlsas the result of a magnetic field. The direction of the magnetic field is

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron moving along the +x adf7s9dn :e cb1 maq:lqzl 16a1xis enters a region where there is a uniform magnetic fieled aclmad:1q: bz6q1f1s7nl9d in the +y direction. What is the direction of the magnetic force on the electron? (+x to right, +y up, and +z out of the page.)

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The magnetic field produced by a long straight currebnhjr8j2w vh 86we8) ent-carrying wire is

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At double the distance from a long current-carrying wire, th)mr nh(g4xo3u e strength of the magnetic field produced by that wire decreases to4o)n mx grhu(3

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wi dcjhs;f8 zl -s/2aga3res placed side-by-side on a horizontal table carry identical size currents il8 3gzs2 j-fsh a/c;dan opposite directions. The wire on your right carries current toward you, and the wire on your left carries current away from you. From your point of view, the magnetic field at the point exactly midway between the two wires

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires placed si( 5 6k f5c2pvg0g;kwfeuj;d7bf6cdf dde-by-side on a horizontal table carry identical current straight toward you. From your point of view, the magnetic field at the point exactly betweb6d75 j cfc u(f ddfp5kg;0f;26wke vgen the two wires

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry equal currents. The magnitude of the force betwz,bc- 1llboz-j b:( cojfy/d6 een the wires is F. The current in each wire is now doubled. What is the magnitude of the new force between the t-/l1:co ,oj(lby jz6bzcd-fb wo wires?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire carries current towarvjh:+(-rbdtoug+ y8 omj;4 i qd the east. A proton moves toward the east alongside and just soquvjt;bio-hr +m 4y8gjo+:d(uth of the wire. What is the direction of the force on the proton?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire lying in the planubd)5f5lt;fx68 4hnkro z qe- e of the page carries a current toward the bottom of the page. What is the direction of the magnetic force it produces on an elect5fo4 lzk;et fxdu6) 85hnr-q bron that is moving perpendicularly toward the wire, also in the plane of the page, from your right?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires are placed side-by-side on a horizontal tabvr2p1:wa/ rbxl i* bk g9wj)79 coi.wble. If the wires carry current inx97k )r cww:g2bjavro.9i*/ w il1bbp the same direction,

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires are plac5jzc.r/hfo0dbr . 2q sed side-by-side on a horizontal table. If the wires carry current in oppc.0soq r db/fz5j2h .rosite directions,

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two current-carrying circular loops. Both are madek,70 mi vamhw9 from one strand of wire and both carry the same current, but one has twice the radius of the imkw0mh,a 79vother. Compared to the magnetic field at the center of the smaller loop, the magnetic field at the center of the larger loop is

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two current-carrying circular loops. Both are made from on6 lyy,-ptnpi klthk(sg 1d6 *6e strand of wire and both carry the same current, but one has twice the radius of the other. Compared to the magnetic moment of*t(y6k1i lsdl 6 ,gtk-npyh6 p the smaller loop, the magnetic moment of the larger loop is

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The maximum torque on a current carrying loop occur99/tf;(izl 6eywjf qts when the angle between the loop's magnetic moment and the magnetic field vector 9i;tzewjyf(6l /q ft9 is

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When placed askew in a magnetic field, a current carrying loop that is fref)r:3rup0 y(8d l (ppodluq h6e to rotate in any direction will experience ald)ppu :h ryfo308(rpduq6( l torque until its magnetic moment vector

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What fundamental fact underlies the operation of essent4j)ah jippw fd6gng p-),9nw,or l1v-ially all electric motors)p4 wvno-6 ar9g1jjlfpwp,h- g ,d i)n?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular wire loop lies+w9xnt 5idr-b in a horizontal plane on a table and carries current in a counterclockwise direction when viewed from above. At this point, tw rtbin95d+x- he Earth's magnetic field points to the north and dips below the horizontal. Which side of the coil tends to lift off of the table because of the torque caused by the currents interaction with the magnetic field?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a mass spectrometer a particle of mass m and charge q is accelejj+0sb6tg 4b um)g (gdrated through a potential difference V and allowed to enter a magnetic field B, where it is deflected in a semi-circular path of radius R. The magnetic field is uniform and oriented perpendicular to the velocity of the particle. Derive an em g4+tbj6d0 u)gbsj g(xpression for the mass of the particle in terms of B, q, V, and R.

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A velocity selector consists of a charge +yo,ma9ym3qfzgmf08d particle passing through crossed electric and magnetic field9y3mm0+ goazym,8qf fs. The forces exerted by these fields are in opposite directions, and only particles of a certain velocity will move in a straight line. In the following, disregard the magnitudes of the fields. In a velocity selector, the particles move toward the east, and the magnetic field is directed to the north. What direction should the electric field point?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-m wire carrying a current of 0.60 A is oriented parallel to a uniforq7e n2-x,b(:nzof55ddqsm qw:qr( h v m magnetic field nsrxq-dovqfzbd(h5:q7 5qe, w (n:2 mof
0.50 T. What is the magnitude of the force it experiences?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire carries a current of 10 A-y bq6mppx9pdl:we) 8 in a direction of $30^{\circ}$ with respect to the direction of a 0.30-T magnetic field. Find the magnitude of the magnetic force on a 0.50-m length of the wire.

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the force per meter on a straight wire carrying 5.0 A when it is o vl)fu7):fe hplaced in a magnetic fiv :fh7ef )uo)leld of 0.020 T? The wire makes an angle of $27^{\circ}$ with respect to the magnetic field lines.

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A thin copper rod 1.0 m long h /qun ga l/,ycmkhp4:+as a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic fouk4,c /:gmnaqlh/y p+rce to cancel the weight of the rod?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stationary proton is in a uniform mpww:i4t yj afz 3+oa951/ iivy,ygcm/h,4fylagnetic field of 0.20 T. What is the magnitude of the magnetic force on thewo: c5pjm 4y,a 9 lyhvii/y,a1 z/fg+t4iwfy 3 proton?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton moving at $4.0 \times 10^4 \; m/s$ horizontally enters a region where a magnetic field of 0.13 T is present, directed vertically downward. What force acts on the proton?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron moves with a+eq9upt pa-; g;ty.f k .k+ljb speed of $5.0 \times 10^4 \; m/s$ perpendicular to a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the electron?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton travels at a speko+jyxhftf .iol0 n.-/p1*wj k5)zg s ed of $5.0 \times 10^7 \; m/s$ through a 1.0-T magnetic field. What is the magnitude of the magnetic force which acts on the proton if the angle between the proton's velocity and the magnetic field vector is $30^{\circ}$?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron traveling due north wii- 5f.e9w gudtth speed $4.0 \times 10^5 \; m/s$ enters a region where the Earth's magnetic field has the magnitude $5.0 \times 10^{-5} \; T$ and is directed downward at $45^{\circ}$ below horizontal. What force acts on the electron?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron moves with a speed of-nh9t sp m s1;5geb:qh $8.0 \times 10^6 \; m/s$ along the +x axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of $60^{\circ}$ to the +x axis and lying in the $xy$ plane. Calculate the magnetic force of the electron.

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron moves with a sj1bpl1*s 9oyr peed of $8.0 \times 10^6 \; m/s$ along the +x axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of $60^{\circ}$ to the +x axis and lying in the $xy$ plane. Calculate the acceleration of the electron.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton has a speed oxx(knofb ( 30nf $3.0 \times 10^6 \; m/s$ in a direction perpendicular to a uniform magnetic field, and the proton moves in a circle of radius 0.20 m. What is the magnitude of the magnetic field?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A very long straight wire carries a current of 25 A. What is the magq t5di 3dt.apngk( yx(ok5;g :nitude of the magnetic field agtg(n ;5:d.d3q5 oykkpa(ti x t a distance of 0.15 m from the wire?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A high power line carrying 1000 A generates what magnetic field at t :64*drm+ttz-m 68 hyg,ilku l,svkouhe ground, 10 m-,:tr48l+il tsv6guyz6 kum, o*dhk m away?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much current must flow for x-wng3u6 n0t /yim4 nw$1.0 \times 10^{-3} \; T$ of magnetic field to be present 1.0 cm from a wire?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what distance from a long straight wire carrying a current of 5.0me 33atwvk x)3 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's )k33weatm3v xmagnetic field of about $5.0 \times 10^{-5} \; T$?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry currents of 10 A in opposite directions. Theyqihvf hjz .x (.bt9wdqd8-42o are separated by 40 cm. What is the magnetic field in the plane of the wires at a pointzvqqhw4i2bf8jdhxd 9 o -.(. t that is 20 cm from one wire and 60 cm from the other?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry curre -:zodte:3k:ehy m3nents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the magnetic field midway between the two wine -3y kt:hem :3oe:dzres?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry currents of 20 A and 5.0 A in ot 3ag:fd7yr, gpposite directions. The wires are separated by 0.20 m. At what point between the t7r y3agdt,gf:wo wires are the contributions from the two wires the same?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Four long parallel we;r/ ( o4fywueires each carry 2.0 A in the same direction. They are parallel to the z-axis, and they pass through the corners of a square of side 4.0 cm positioned in the x-y plane. What magnetic field does one of the wires experience due to the other wi;( we/u4erofy res?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two long parallel wires carry currents of 5g8;kghl y5 mto-.sb-o;.kc ds.0 A and 8.0 A in the opposite direction. The wires are separated by 0.30 m. Find the magnet; go-l.s ydk8mchg ts-o.k;5 bic force per unit length between the two wires.

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the magnetic field at the center of a circular loop of wirf 9: .ddrbb slm2w/)qfe of radius 4.0 cm when a curr2 dd/)l9. bmfq: rswbfent of 2.0 A flows in the wire?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solenoid 20 cm long is wound with 5000 turns i tk1*tad6p-b of wire. What magnetic field is produced at the centertb*i a6pdk1- t of the solenoid when a current of 10 A flows?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solenoid with 500 turns is 0.10 m long and carriw v7y3.tgh:q tes a current of 4.0 A. What str yt3qw 7h.vt:gength of magnetic field will it have at its center?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much current must pass through a 400 turn 6u3p.lxa8n k.xf +6wkp+pb j scoil 4.0 cm long to generate a 1.0-T mppxkf+ 6.k aulbx+.s j86n3 wpagnetic field at the center?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many turns should i/n.*td/bfzf ml0y 6c a 10-cm long solenoid have if it is to generate a $1.5 \times 10^{-3} \; T$ magnetic field on 1.0 A of current?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the magnetic moment of a rectangular loop of 120 -jusemrc 638n 0a0ivnturns that carries 6.0 A if its dimens0nj3acs v6u8 irn-e 0mions are 4.0 cm x 8.0 cm?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire of radill6bv,-w-mei a r 9thr4/ke r1us 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetw6,ev-t l/ekr9l1rm 4a b-h iric field?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wd xwid,r0l 4,oxi l:4lire of cross-sectional area $0.12 \; m^{2}$ consists of 200 turns, each carrying 0.50 A current. It is placed in a magnetic field of 0.050 T oriented at $30^{\circ}$ to the plane of the loop. What torque acts on the loop?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop carryin,:jel 39l /2ijwkecb gg a current of 2.0 A is in a magnetic field of 3.5 T. The e3w9kjl:i b 2 je,c/glloop has an area of $0.12 \; m^{2}$ and its plane is oriented at a $37^{\circ}$ angle to the field. What is the magnitude of the magnetic torque on the loop?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire of radius 0.50 m is in a uniform magnetic qse7a6o+6d xq mbastappbo2 93y+04 afield of 0.30 T. The current im9d ao6+bapo3pb6x q0s7s at4yeaq 2 +n the loop is 2.0 A. What is the magnetic torque when the plane of the loop is parallel to the magnetic field?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire ofb tn;h *2 -mofy8bao+z radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is pa b hnya;8t-f m*b+oo2zrallel to the magnetic field?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular wire loop of are qen a )q/bv6-fs+n3cx(v0i bia $0.25 \; m^{2}$ carries a current of 5.0 A. The coil lies in a horizontal plane with the current flowing in the counterclockwise direction when viewed from above. At this point, the Earth's magnetic field is $1.2 \times 10^{-4} \; T$ directed $60^{\circ}$ below the horizontal. What is the magnitude of the torque which acts on the loop?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a mass spectrometer, a single-charged particle (charge e) mwo3m ;cywc1+*t 1dre has a speed of $1.0 \times 10^6 \; m/s$ and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit is 0.020 m. What is the mass of the particle?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A doubly charged ion with velocitudf:4zvww7tnc2k- t t;9c7zmy $6.9 \times 10^6 \; m/s$ moves in a path of radius 30 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton travels through a potential of 1.0 kn gyjl09q91 glV and then moves into a magnetic field of 0.040 T. What is the radius of the proton's resulting g9j lyl1 q09gnorbit?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton is accelerated from rest(h5ai b6fbzp s7 8u,tf through 500 V. It enters a magnetic field of 0.30 T oriented perpendicular to its direction ofi5fu,tz6hb f (a b8ps7 motion. Determine the radius of the path it follows.

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A beam of electrons is accelerated through a potential difference of 10 / 2t k/tzqe;+1/ubu: olceudh kV before entering a velocity selector. If the B-field of the velocity selector has a value of 0.010 T, what value of the E-field is required if the partl 2 uhtzu1:+;qe t/oukbd/ce/icles are to be undeflected?

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