09.18: A wire has a conventional curr or7o80quag25k soy3fent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. Th5oufs2 gk0oy o 783qrae magnetic force on the electron at this instant is

  14.24: For the bar makyjg8s *ik4 9w(uorf- gnet shown in the figure, which choice best describes the direction of the magnetic field at the point P located directly ab o9g-ifk *(u r8ywsk4jove the center of the magnet?

  11.34: A wire lies in the plane of td r./5n9 fdtsz .c:pndhe page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward tf:.n5ddts9.p dzcn r/he wire?

  13.30: Electrons flow to ttslx)t j,()urzm 3.uthe left in a wire as shown. For the proton moving toward the top of the page a.tu,l t)3u(z) rtjx smt the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long/w300m40urcyj oqgz1c .fxc d straight wire flows in the upward direction as shown in the figure. (Electron flow is c00uyo0rcxz .q3/dc fm4w1gj downward.) 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 w.mrsl6z5* m2ja dkqa,;ti7c jch*j5bith constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle wisa7 a2cz 55lb6 jj;th c* kmq*.mdjr,ill:

  98.10: A charged particle with constant velocity9yxzg/bvcew op+ iwr8(-c: f0 enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle willb +w/: 0fr ( p8egwix9zoc-cyv

  03.34: A positively charged particle ofsu+jb iq8 p/*m 3an b/ban(2 ,s*zeicb mass 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 the magnitude of the electric force on the partijb8n q+i(u3ian sb csbz,/meb 2** /pacle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velocity in a region of space thaw5x32ta r20z8 uaxscgt has a uniform magnetic field directed into the plane of the3asa8w2 gc05 z2rxtxu 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 bgx9nyo j(/m -;zmh 1m17wwxoprv 69ufrom rest between the poles of a horseshoe magnet as shown. What would be the direction of thenyom1 6u hwxwvjr ;9-xm/ z(obmp 791g acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of th..d+ uwnnw wy6e page 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 yn . 6uwwwdn+.the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron m.;veinjb/( p ;0vum fd+yhgvd 56f2sh 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 aj9iz4uu lxv/6k)jq w 9nd mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the electron travels halfway around i)4 v9q6luzwj9ku/j xthe 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 en.03nq/zu7f zj xtlvm ;x;)ke cqi ,l(hters 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 will be the radius of the second ion’s ;qliu0 n(e ,;tq/3) hxzfjvk7 z.xl mcpath?

  16.44: A proton moves in a circular orbit in a uniform magnetic fiazqjkms s9v)ar;95 x.eld B. A helium nucleus ma.x;jaq9 sz )rkv59s 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 of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to tbvwmv:9b)8 v b db5c7the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of td598 bc :7 b)mbvtvvbwhe following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It ent8l+ zcnbs8ala7c(. pe m- )wzbers a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction dzpa )clz+b(w8lsm7nea- . cb8oes 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 kinetic e;l- 3ygoy 5vj;rsx 0ainergy $E_k$ 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 * o;yjx+osis4gg-31gaffdyu k t* a6zj;+fy3beta particles is commonly determined bt f 4odgzuso63++j kff ajyaxs 3 ;-i;gg1**yyy

  09.27: A proton moves straight up the plane of this page into a region thfcqlg y 00em,(at 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 component of electric field? Ignore0,mcl g e(0yqf gravity.

  08.36: An electron moves in the planet 4emmn ;,vnp) of the page through two regions of space along the dot)4mptn,ev;nm ted-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 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 conqz-fr +tbkik5o((-kv stant velocity through a region of space contain-oi5 f((kkzk rbq+v- ting 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 tw x8oa:z)qsl3 oe e,x(to long straight wires. The conventional curren l qtaoz(8xx,:e 3seo)t in each wire has the same magnitude, 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.