Chapter 20, Problem 8MCQ

Particles of various masses, charges, and speeds are injected into a region in which a uniform $\stackrel{\to }{E}$ field and a uniform $\stackrel{\to }{B}$ field are perpendicular to each other. All the particles are initially moving in the same direction Which two conditions must be simultaneously fulfilled for the particles to continue moving in a straight line after entering the region?

a. The particles must have the same mass. b The particles must have the same charge.

c. The particles must have the same speed.

d. The particles must have the same kinetic energy.

e. The particles must have the same momentum.

f. The particles' velocities must be parallel to the $\stackrel{\to }{E}$ field.

g. The particles' velocities must be parallel to the $\stackrel{\to }{B}$ field.

h. The particles' velocities must be perpendicular to the $\stackrel{\to }{E}$ field and the $\stackrel{\to }{B}$ field.

i. The particles’ velocities must be perpendicular to the $\stackrel{\to }{B}$ field.

j. The particles' velocities must be perpendicular to the $\stackrel{\to }{E}$ field