A 7.12 μC charge is moving at the speed of light in a magnetic field of 4.02 mT. What is the force on the charge?

858.7 N

Explanation:

The magnetic force on the charge F = Bqv where B = magnetic field strength = 4.02 mT = 4.02 * 10⁻³ T, q = charge = 7.12 μC = 7.12 * 10⁻⁶ C and v = c = speed of light = 3 * 10⁸ m/s

F = Bqc

= 4.02 * 10⁻³ T * 7.12 * 10⁻⁶ C * 3 * 10⁸ m/s

= 858.7 N