"Determine the mass of an unknown hanging object: An unknown mass of washers was hung from the Circular Motion Apparatus and he following data was collected for a bob traveling in a circle at various"

An electron moving at 5.06 103 m/s in a 1.23 t magnetic field experiences a magnetic force of 1.40 10-16 n. what angle does the velocity of the electron make with the magnetic field? there are two answers between 0° and 180°. (enter your answers from smallest to largest.)