Tesla which is directed either out of the paper or into the paper. The figure shows the velocity vector at various points around the circular path of the particle. Draw the acceleration vector at each point.
Acceleration points inward towards the center.
Force points in the same direction. The particle is negatively charged. For the velocities shown, this requires a magnetic field that is out of the paper. Find the magnetic force and then find the radius of the circle that the particle moves in . After the electric field is applied the particle moves in a straight line at constant speed.