An electron is accelerated through 2550 V from rest and then enters a region where there is a uniform 1.30 T magnetic field. What are the maximum and minimum magnitudes of the magentic force acting on this electron?

Answer 1

First get the velocity (v) by setting
e V = (1/2) m v^2 (the kinetic energy)

(Capital V is the voltage)

The minumum magnetic force is zero (and occurs when v and B are parallel) and the maximum is e*v*B.