09.18: A wire has a conventional current I directed to the right. At the instantvuwqhe ( m 8(wjbc:4/ x-wplyp6g-p3b shown in the figure, an electron hbxpbpwe(:8 3c4vlqj(mw h- u/ p6gy-w as a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in th3x; l rj)5.o uuu u*,wmmtwj7me figure, which choice best describes the direction of the magnetic field at the point P located directujt57owu ;)mulmr 3wj.,xmu* ly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current)/di :ab4zgl(ukqwld sns88u p2a o5 42if3p t I shown. At the instant shown, what is the directiono38aqg24pzi fl a()t/p84n iu:uskld2ds5 wb 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 moving tow /n rp*etr/ k9dm zt)al/j kqkz(jtz1p:(l j3.ard the top of the page at the instant shownj1p*eqp:9t(k/ /kzjk/l nla ttzm3dr( zjr.), what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wirko 28vz h09pcpio42o ayy3 ,pre flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a protoyaop, h2y89opv0 4p3 kir2 cozn 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 c3) 9-dulay1 pf qv/xedt rld45onstant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocitpt9x-vll/5 3d r )df dya4q1euy. The particle will:

  98.10: A charged particle with constant velocity enters a uniknyfy *ddi h,s 9r.b1-pw,q5nform magnetic field whose direction is parallel to the particle’s velocity. The particle 1ddnyk9,fwr5 -b .hp*s,y qinwill

  03.34: A positively charged pmx;z)8a (c ;mypda+jn article of mass M is at rest on a table. A non- zero electric field(jma8zc +xdpn ;;y am) 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 with constant non-zero velocity wr-4i* x+wehq in a region of space that has a uniform magnetic field directed into the *+ -whqr4ixweplane 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 weis6tu 5y2xndeo,w * 7cight is released from rest between the poles of a horseshoe magnet cxny2w*tu65 s iedo7, 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 wie :a n++5g7vo6awthc m3:daof 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 7t365+na:whvda cea+wo i m:g direction of the resulting magnetic force on the electron?

  11.29: An electron mo*wi-h hcj0t(t*pdv e2ves 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 ar 1*kt m/wm0va 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 halfwava0wr mk/*t m1y 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 l4lp xm8, +b awdgp5)9c)n ihgq, 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 will be the radidip8nl459amgbxc p,g ) h) +wlus of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniformd(d 47;q9wf2fzsgfn n magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each par( f;q2 df ngz4f7nsw9dticle 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 perpendicularg 1fjoep r7p bo5a;om1 g*6:va to the same uniform magnetic field. The ions carry th1oo6ppaf15r v :oam; jggb7*e e same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a r,dx*p3b vcolp -l* 4leegion 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 poixc dvlo* el43l*pbp,- nt in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass Md h(b7uep jr3tix c.7- and 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 par4cd q:m9rba0 dticles is commonly determined by:q 4ac90rddb m

  09.27: A proton moves straight up the pmv h1 nl7aojl. z261uflane of 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 uh7m a6 v11nj2flloz .be a component of electric field? Ignore gravity.

  08.36: An electron moves i2cbz lzz3w6h(n the plane of the page through two regions of space along tw6zc2(hbzz l 3he 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 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 m 03hq(l/7 uio;xrlu7xw bpx6foves with constant velocity through a region of space containi lxqx h(w;xf03bpo /lu77r6uing 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 vel v-mmodw+p tjtdc/:mw ; hd l(tg41o60ocity 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 gravitym;m(-0 hl p6 /wj: 4tctmvddo+dgwo1t , 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.