09.18: A wire has a conventional current I directed to 5vnv)sz vdo49u7n dwbz:0k( ethe right. At the instant shown in the figure, an eldbv0 nvovnzd )5e:4 us(k7z9wectron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice7r*bw+sk6oig best describes the direction of the magnetic field at the point P located directly above the center o+ ioswg*b76kr f the magnet?

  11.34: A wire lies in the-t,n )fagvk m8 plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic a)kg , vmnft8-force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a ky5fe5v *m xj ps3(cap67hm1vwire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the protonh5 (16j3 pmxcf*ks5yvvpm 7a e?

  94.30: The conventionalxto 988-hd3j /qalhuoef1 ux4 current I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the ihjx a8 qfd83 4ut/h-o x9el1ounstant a proton of charge +e is a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particc(ofjc2zb pe31(chb/ le with constant speed enters a uniform magnetic field whose direction is perpendicular to thcecfb 32bhpoc( j(1/z e particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniforvw8cqx7 ioy*:j0 krk e7gw -)am magnetic field whose direction is parax7wk-k0aywvr:8e*gi j c) o q7llel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table3j d.0ml5bf,qwxw e,a. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the table. What is true about the mxl3qf w0mj, bawd, e.5agnitude of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velocits1x3)g p 0cb *2c . y+cbccqz;l(dftnuy in a region of space that has a unf l n0tc3csucz (.xby qpcc1*);+2g bdiform magnetic field directed into the plane of the page. The proton moves directly up the plane of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released fro-0l-6j7*r 2zyl(lcf.jqv rjmiq4r hk m rest between the poles of a horseshoe magneizf-r q7 6j.yc2k4m r0v rq *jll-lhj(t as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the pacg mt+:9r,ihwr7 0bre ge at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the instant that the electron enters the magnetic field, which best describes the direction : bwi +rtm7 0rgerch9,of the resulting magnetic force on the electron?

  11.29: An electron mhmf t;39b8etk oves with speed $1.00× 10^3\: m/s$ as it enters a region of space that has only a uniform magnetic field. The electron is accelerated because of this field with a constant magnitude of $8.00× 10^5\: m/s^2$ for the entire time of $1.00× 10^{−3}s $ that it is in the field. With what speed would the electron exit the field? Ignore gravity.

  14.29 An electron with charge −e and mass m travels at a speed v in a plane p h uil6xs /t67ab*xew.erpendicular to a magnetic field of magnitude B. The electron follows * bx sut.7awi6x6lhe/ a circular path of radius R. In a time t, the electron travels halfway around the circle. What is the amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m,tw+xk* 0c z3:. z ucaz0pyzvf4 and speed v enters a magnetic field B and is deflected into a pat .c+uxzwf zz:y*vac4 0t3 zk0ph with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. c*cm;66 lqb tjA helium nucleus mocbj6m*6lc q ;tves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force during its motion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetigb es5;i/xr7i c field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must bex/ 7b egi;sri5 the same for the two ions?

  02.15: A positively charged particle moves to the right. It x ,g pkw,waw14enters a region of space in which ther4wp1kw,a gxw, e is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and k- uhdpqmg8g6tkv8d/ g z3 9/nva,yeb7 inetic energy $E_k$ passes undeflected through a region with electric
and magnetic fields perpendicular to each other. The electric field has magnitude E. The magnitude
of the magnetic field B is:

  04.25: The speed of electrically chargua( dzs4.wor 1ed beta particles is commonly determined b.d wrua so(z41y

  09.27: A proton moves straight up the plane of this pan2web2wm.soqngh,k2 8*wuqsjb6i 1- ge into a region that has a magnetic field directed to the right. If the particle is undeflected as itwhm 681sgw q22w,ij*qo.2bnus n- e bk passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in theiut ,vy80(:c+i bd;2(u nuftycwd.lx plane of the page through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed into the plane of the page (as shown). There is no electric fieid8ux(2vubf( dlnc ;yt i0wcu,: t+y. ld in Region II. What is a necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocigyb 60 ivn ql.jj:eoij23s. )qty through a region of space containing bothlij6j:sn j3 q0ig.v2yqe. bo ) an
electric field and a magnetic field. The electric field is directed out of the plane of the page.
Ignoring any gravitational field, which one of the following choices represents possible directions
of both the particle’s velocity and the total magnetic field in the region of space?

  15.29: An electron movkma//a s2ps:t es at constant non-zero velocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directions as show stkp//a a:m2sn in the figure. Ignoring gravity, which choice best reflects the direction of the magnetic field and the direction of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.