Question

the force on a charge moving with velocity (v) in a magnetic field (B) half of a maximum force.

Calculate the angle between V and B. F=qvB

Answer 1

The Lorentz force is given by

$$F=qvB\sin\theta$$

Hence, the angle between field and velocity

$$\theta=\sin^{-1}\left(\frac{F}{qvB}\right)$$