magnetic force in physics

Question

An electron in a vacuum is first accelerated 

by a voltage of 15600 V and then enters a 

region in which there is a uniform magnetic 

field of 0.689 T at right angles to the direction 

of the electron’s motion. 

What is the force on the electron due to the 

magnetic field? 

Answer in units of N.

Answer 1

ΔU = q·ΔV

ΔK = –ΔU

K = ¹/₂ m v²

F = q v × B