09.18: A wire has a sh2k0 .o y)acyconventional current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force o)oykha 2 c.y0sn the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best d waw8bwh:m 87vescribes the direction o:a8h8wbv7mw wf 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 current I shown. Agyblr 6tbht )1,v 0(zmt the instant shown, what is the direction of the magnetic force on the electron thatbrzg,lyt ht0v)6b(1m is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. Flck xgcq2gb q*,4-;k ztr:+b uor the proton moving toward 2; ,q-l tuqg+ck:rcx* kgb4bz the 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 straighteck le qf)ybmgq s05*z w:p3/v40mb,v 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 directly toward it, the force on the proton ipl/eegmqcv,z:v5qm f3 *0)bs kbw y40s:

  95.16: A charged particle with constant speed enters a uniform magnetic fiel331twj6;1xxz+b kmme )fqwe2qz 5 esld whose direction is perpendicular to the particle’s velocity. The partict1 ql3j;z6 x5kf 1wzee)e3 m2xmqb +swle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fie 9 dfqorpfezdg) /3 ch3dr-/5lld whose direction is parallel to the o)d5qef rlc/9dhfg /-z 3pdr3particle’s velocity. The particle will

  03.34: A positively charged particle 5s*m dgge7y6 yof 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 ym 6dgg*y se57magnitude 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 velocitycxnx 8gx vf(cr;78cn/ in a region of space that has a uniform magnetic field directed into the plane of the pagfx xc7v (xcn;8gnr8/ ce. 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 charg621taplc acl6e of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the ma6 2 ll1capat6cgnetic field?

  10.26: An electron moving in the plie4dnon,a0x k)- wh 3lane 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 page as shown. At the instant that the electron enters the magnetic field)0nx wd3l,a - ihk4eon, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves witia+n mj qwsq0icm1y*/f9bj wz-d k+,4h 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 chargeuo79h-(bbg a p7.x np2vdfa1v −e and 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 the circle. What is the amount of work done by the magnetic force on the 1(pg2- up v.bvb7ha7fna9 xodelectron in this time?

  97.28: An ion with charge q, mass m, and speed v enters gn9whu *uvi08a magnetic field B and is deflected into a path with a radius ou gh 9in0uw*8vf 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 o8vnrr4ej.hk wv 40 bh9we0f)krbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same w84r wvf9rvhjek0).kbe hn0 4 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 perpen a +wffq+f/mu4dicular 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 follo+m wa f4/q+fufwing quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a region of q/ckx3jp n::kxcj-t0c, /ske space in which there is an,et3:xnc/: jq/sk ckjxk-0c p 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 kinetis-ra-hgq 6c rdc yd/-+c 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 bet1;qjf0gwkspymrlh 3 ,qk,8po2dw ;s1a particles is commonly determined by ;,wo8q l10ksdwghp, 1s32mpkj;q fyr

  09.27: A proton moves straight up the plane oavd), 6z2tupdf this page 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 comp 6z,t ud2d)pvaonent of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through tzpe e8iw, /dnmup,t +)w) 9azwwo 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 zud9pn , pw ea+e)m/wt,8 zi)wis 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 through a region soh3 9g0( l.mcy2wyge 33nof kof space conta e33yofkl gmgw(o930c .2hynsining 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-zerohl/ b, osp 3;onzt5t0g 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 shown in the figure. Ignoring gravity, which choice b,0tz5 /ton3hl ; gospbest 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.