09.18: A wire has a conventionawr er.uod 6d51l current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetr u o.5dw6der1ic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes the7ws)d8 -ulwv0iudig1 .bn l, f direction of the magnetic field at the point P located directly above the center of the magne,uddw i fun.)1 8iws7vb -0gllt?

  11.34: A wire lies in the plane of the q- 8ii7rj m8jhpage with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that 8 8j7-hmiirjq is moving directly to the right toward the wire?

  13.30: Electrons flow t al ba, 8dfg;m s5ra7a: dwgsh,onj0:9o the left in a wire as shown. For the proton moving toward the top of the page dwg 7a09s;,a: ang5 h,d:mol8bsfj raat 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 flows in the upwarg7pirsyuhq:p 1:+bi 9 d direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distpuhp7 igr+ib:9 sy:q 1ance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant spe ;b0ow.nilx(hzx;ab 93wrzfp- l+/qued enters a uniform magnetic field whose direction is perpendic (frxl xqba;b 9h3-ln.0w/+oi pzwz ;uular to the particle’s velocity. The particle will:

  98.10: A charged particle 4jg*prh:ma4 7 ; txzt(cu+qs hwith constant velocity enters a uniform magnetic field whose direction isru(h74jz s*4apgh t;:mxcq t+ parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table (.zsoeb) +yjn. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed bz.y+soj)e(n 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-zej6kz9,e * o7ptdzhkcsk j4t /*d6kp+rro velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves7*/,rzt6skpek kjod ctjd z 4hk9*p+ 6 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 w qtj v 2.:,8xnnu-cfcweight is released from rest between the poles of a horseshoe magnet as shownn-.2 x:wv8qjut , ccfn. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plan)m7r u d6dv9g+q4vm-a76 e,febmqjt hhz-.xee 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, which best describes the direction of the resulqbv vd,7+9. hgmz--6eer aeq )ut64hd jmfmx7 ting magnetic force on the electron?

  11.29: An electron moves with speed:ko /o r,9-aezkn il(lgre9 s+ $1.00× 10^3\: m/s$ 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 speexpt4ew.qacw r/x5 n.4d v in a plane perpendicular to a magnetic field of magnitude B. The electron f.4wt /e.5xpaw n 4xqcrollows 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 charge q n9(zp*bufx92(d .q +pslja of, 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 unchp9(f9 jzd2(b.nsx *aoqu+p lfanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circul9.hap3ein5 a har orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences thenha.9hi a5 3pe 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 the same unif*xxk b 5gkqi,:v v9x)form magnetic field. The ions c*9k g :xxvfi)5xbq kv,arry the 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 e5qm4)n1 xzdne ov;o*onters 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 a constant1em oq )zx5d on*;onv4 velocity?

  96.40: A proton of mass M and kindjy; zc-)1xo)jq+dg qdg2 sn:etic 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 particht5x(dzoi)t hk )q 41wles is commonly determined b z1dto(tq 5)x 4hhik)wy

  09.27: A proton moves straigu/e-m 6*7orcb5snq pnn6rk tyn.);iq ht up the plane 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-qn qer;k75ns)/ y6nmt6.pbcou*n i r there be a component of electric field? Ignore gravity.

  08.36: An electron mot + - wep)dsksar*znucc8 cm0+ 3yp5f,ves in the plane of the page through two regions of space along the dotted-line trajectory shown in the figure.cs)r8s , u+w05t zmde pf3yk+*-ccnpa 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 through a region of spav- 19 sgx*l9yqnvefn5 ce containing both an el*gnyv-5s n 9fvq91x
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 t+k44iga8 mwzconstant non-zero velocity directly between two long straight wires. The conventional current in each wire has the same zt48mi+aw k 4gmagnitude, 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.