09.18: A wire has a conventional current fw)eq:-ns 4w/a4lhox6,iws f86op l aI directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. Thes)qn8lx aei:fow wlso4, -6/afwh64 p magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, whh1o:pzi w sq/7auoh p;mc)/h)ich choice best describes the di:p))ohz;au so1wqpc /hmhi/7rection of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional cu, fq p467jt* ldlje.l/8rxlixrrent I shown. At the instant shown, whxx /, lqild.fetpl67l* j 4jr8at is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving0+ rr avl1i3dn toward the top of thn r +0air1dvl3e page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional curre-9wyde(ihnk vv37w 8zu1p do7nt I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading direc7n(i-zvwh7oudkw y 318pd9 evtly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enter2 pt-l9qffti,s a uniform magnetic field whose direction is perpendicular to the particle’s,9tifql -p2 ft velocity. The particle will:

  98.10: A charged particle with constant )pdik.7zphl xs, : d3kvelocity enters a uniform magnetic field whose direction is parallel to the particle’s ve7pdk.khz,x il : dps3)locity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non- zeg3qckxzx *l8)6cc zzc .8/(zcgu,ss fro elec8c.zug8/s6zc gcxlf*),z( z 3qckc sxtric 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 magnitude of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves wj+tqjamkp( 33g wyrw3o/d n6-ith constant non-zero velocity in a region of space that has a uniform / -j3kwd m3nt6p+gajy rq(wo3magnetic 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 from 5ebk )d3j p0(gjivn *grest betwkp n ji(g*eb35 0dv)jgeen the poles of a horseshoe magnet 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 page at an angle of 300qg ,n35fkp+s c to the horizontal enters a region with a constan5 c+3,nqfgks pt 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 of the resulting magnetic force on the electron?

  11.29: An electron moves with speedhxgr(; zmx4sn82u7k xt2w9a ;jf n;yw $1.00× 10^3\: m/s$ 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 travelso jzei2 a4n-uqn+idq oq3;m;2h ug,5 a at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radii, ah-4 qquuij25 ao;+ge3doqnz 2 ;nmus 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, and speed v enters a p5+hk i,sj +aisg-kx6magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, whis56x- pkig,ish+a jk+le 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 unif4w/ h/gdo, qnn xz,u tek,ave+*;rva,orm magnetic field B. A helium nucleus moves 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 *hkz4 n/t, rqgo,xae; v/n+udea ,w,vof the helium to the speed of the proton?

  10.43: Two ions travel perpenav a-5c .;glcndicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the followi;-.vccn gl5aang quantities must be the same for the two ions?

  02.15: A positively charged particle moves to t-w jfk9zmql 24he right. It enters a region of space in which there 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 am-9l4k fwz2jq constant velocity?

  96.40: A proton of mass M and kinetic pivi id mu4he0-, 9lc5qb+o4fi,7nqip-u/ un 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 charged beta particles is commonl -,a) ipp+aojly determined byl),ojai+ -pp a

  09.27: A proton moves straight gj 5* cf:z+ bv4zm dfl3/a3zpvup the plane of this page into a region that has a magnetic field directed to the right. If the particlezdzl c 5+a:gv3fj *bmp/3z4vf is undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane oc.0 so :hfn6 :1o;sqxfvf fjg3f the page through two regions of space along the dotted-line trajectory shojs0h3f ;.fcf xovo6n: fs 1gq:wn 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 field 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 velocity throug c ogzau2xug2+f/n 4b vyif:;6h a region of space containing bothu6 vcn 4 2bugfgf+z y/2ia;xo: 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 moves 60vn,byz/a.4bjnkue ; 7plhiat constant non-zero velocity directly between two long straight wires. The conventional current in each wire has the same mahn,v;4i je. z60u7bnk/ ab ylpgnitude, but the currents are in opposite directions as shown 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.