1. The problem statement, all variables and given/known data A charge enters a magnetic field. Draw the path the charge will follow and find the radius and period of the particle's path. v=10m/s (drawn as a straight line pointing right) q=3c B=4T (points outward) 2. Relevant equations I'm not sure. 3. The attempt at a solution The charge is drawn as positive. Wouldn't I need the mass for an equation? I don't know what the mass would be. Would it just be the mass of a proton? Also, anyone know what equation I would use?