09.18: A wire has a conventional current I directed to the right. Ab4y8yjyuo50x m4fuxj +oz .p+t the instant shown in the figure, an electron has a velocitz4byfxuyy0 5 o+pm j+x48u.joy directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magne9mwmdu h7 gn1weyg.sg-/dk * 7t shown in the figure, which choice best describes the direction of the magnetic field at the point P located direcd wnmg1megy-/w7k .g*9h 7udstly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conven gbs,yxq)8 ha-tional current I shown. At the instant shown, what is thhb q,gsx8-ya)e direction 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 protoq *euw)kdc 11gn moving toward the top of the page at the instant shown, what is the di d1qc)*uewk1 grection of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upward dwr*b7d j ikg//irection as shown in the figure. (Electron flow is downward.) At the instant a proton okw*gd/ i/ b7rjf 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 jtxl*y()qbh;wg4 8sm with constant speed enters a uniform magnetic field whose direction is perpendicular tw;t(hgy )bm4 jsl* 8xqo the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a p*bqo(v 7uenjsai 2-(uniform magnetic field whose direction is parallel to the particle’s velocity. The pae 2vo*jb n-pu(ai7s( qrticle will

  03.34: A positively charged particle of mass M is at rest on4:c 0 ig.5wycnktfzx+hl4 r(c a table. A non- zero electric field E is directed into the plane of the tableir:tgcx fn05 + z y4w4kh.(lcc. 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 constan)wa 5cmeib 0r2t non-zero velocity in a region of space that has a 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 erm0) 5cib2awe lectric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from rest n a-.z*y+xpza between the poles of a x.n-pzzaa +*yhorseshoe magnet 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 pm h2)nzv6 + wjp.c;mavlane 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 el vpvw+n;mz6m2h .a)cjectron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves withhk 6 ;0ytwfr 7bkolz.0 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 anmu-c yg)/ pd-m(d9 jlod 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 d)o m-yg( u9pcjld -m/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,af9q1f:9 s2 zrmb8qa i 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 qrm 9fas1f9 b2zi:8aq be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. A helis1/2 aup+,mh rehl 7c:yaf8cvum nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnet:y f 8r,ucvam2a7e1 lh/c+hsp ic 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 pebi qkdr(l77zb 85,6ksgyo y2erpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnel gr7(q eo6ybbd,isz7 2k85yktic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle move :s2uf,wtz8(zoq h*mps to the right. It enters 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 ip2s 8zu,wq(fm* zt:ho n this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M an7fxjo-*cb7d7r y4hty d 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 particlesdf,l8j e 59ibgxa: y.i is commonly determined byfl5ie ,:d.bjgx8ia y9

  09.27: A proton moves straight up the plane of this page into a region 6v18 atbqb mr)aiwmmy3x 2a+q ykx 679that has a magnetic field directed to the right. If the particle is undeflected as2tqqwa3a9)rbi xm67mx+k6vm by81 ya it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regions :uvi;a;clr 60 fyg2ieof space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed intrc: ;luaiif;e 6g2y 0vo 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 const)v; *amv6fjd8mb7a z uant velocity through a region of space cobmja8 ; afudz 6v*v7m)ntaining 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 constwx0,ocfz -px.qh rtx w .r5t07ant non-zero 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 thwx0z xf.wohrqc5t- 0t,. xrp7e 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.