Answer to Question #192689 in Electricity and Magnetism for Ahmed

Question

Suppose a charge is moving with a velocity

Answer 1

Usually problems that begin like that end like this:

...v in a magnetic field B so that the field is at 90° to the direction of motion. Find the magnitude of the magnetic force if the charge is e

Solution:

The answer is the Lorentz force:

$$F=evB.$$