09.18: A wire has a conventiovsojq 8e+t :t 1y+,ga4nz *ckinal current I directed to the right. At the instant shown in the figure, an electron has ay+nkev1cjtsgot *i+8z,:4 qa velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figurtue7/ b3hfjcv, v+jt c.)p ;gie, which choice best describes the direction of the magnetic field at the point P located directly above theti37g tb)vpc;v c,.he +/jjuf center of the magnet?

  11.34: A wire lies in the plane s jxst:o( didjx47qy)y)c*ds -jm)(fof the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that d)xs7q(ysdjsjd - x)j(:f *c)toiy4mis moving directly to the right toward the wire?

  13.30: Electrons flow to the lef6g9lab,1k oc(a-.b /xf5d n8yr cbhrjt in a wire as shown. For the proton moving toward t6 gj-r5rkoy,(b9 8cb/daxfnb. c1lhahe top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flowstxrrh1-n1c; v in the upward direction as shown in the figure. (Electron flow is dow1x- rh 1crvtn;nward.) At the instant 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 particle with constant speed enters a unifowkkmd.13b2dy/ cx91nl4tsao+t3 ep xrm magnetic field whsnlw ax/1y .k49+e3c1 do2kd tmx3pbt ose direction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a unif/j:zuz2lrm8 g n2p9o vorm magnetic field whose dire pmln2z92u:vz r/8goj ction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of maf 8(s+ayfq e bz37 4+krnujdf.ss M is at rest on a table. 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 tf jyz r+de +fs (nqak.3b8u74fhe 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 with constant * *cez7h5mqbu d9kbi4non-zero velocity in a region of space that has amzhic* b9dek54uq7b * uniform 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 wem+ijh9t z;9y hnq8b(sight is released from rest between the poles of a horseshoe magnet as sh(si; ybqz8th9nm+h9 j own. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane d7olk1e+9 alb8j yg9c of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the l 9gyo9+d 81c7k jbealpage 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 spyzq-tv:8g7i,vfyq )+x,t7u 5gzj vepeed $1.00× 10^3\: m/s$ 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 st54d u 9gtdho4peed v in a plane perpendicular to a magnetic field of magnit4hutt4do9 5dgude B. The electron follows 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 chars bxg mmc etvxm1p+2z-1 l*y j)7vuo/(ge q, mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, what wilx7jx s1yl cmo( z mm -)buvt1vg*pe2+/l be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform mauq9y9y/t pjvgrf+ob5 2x22az gnetic 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+o x2zyur/gb9 jqp5 ftva9y22, 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 (l:6y .znvhivlu3v q9magnetic field. The ions carry the same charge and have the same path radius in the magnetic field.l6l vy3u.iq: hz(9 vnv Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It +1rd 8 fbd*v :7tocfreenters a region of space in which there is an electric field directed up the plane of the paper (see figure). Inov :t d*f1de+ c8f7rrb 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 acqt,,)lka*kh-yr w 2ynd kinetic 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 particlgzr y lhz;ol:9adb/ 54es is commonly determined ba9r;gzlh4/lz ob:d y 5y

  09.27: A proton moves straight up the plane of this pa jn2t8qv.;ic dq,9mlj ge into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must there be a cjqv;,i9qc82nmt . dl jomponent of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page th5l2 )vb*.77z0v mfuzjjtnyid rough two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field vzu v2 )7 l57 0i*zfjnymjdb.tin 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 co rmc7anpo41w 9nstant velocity through a region of space 9p7wm ocnar 14containing both 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 at constant non-zero velocity directly between j p,sl7w 0jzq50+ 3vs7thztljtwo long straight wires. The conventional current in each wire has the same magnitude, but t 7ttz3qls 0+w,pjjv05sj7 hz lhe 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.