Question

In a magnetic field of 8x10^-4 T oriented south, a 3.21x10^-6 C flows east at a velocity of

4x10^6 m/s. How strong is the magnetic force operating on the charge?

Answer 1

$$F=qvB\\ =3.21*10^{-6}*4*10^6*8*10^{-4}=0.01\:\rm N$$