Question

a) A +100-μC charge produces 1.5 T field 2 cm from the charge. Determine the magnitude of velocity of the charge. b) What magnetic field is produced by a charge twice that in part a) 4 cm away from it?

Answer 1

a) By the famous equation:

$$v=\dfrac F{qB}=\dfrac F{1.5·10^{-4}.}$$

b) 4 times smaller.