[Solved] Proton orbit direction 1. The problem statement, all variables and given/known data A solenoid has a magnetic field in the +z direction. A proton in the center of the solenoid moves towards the sides sides of the solenoid. Will this proton move with a clockwise or counterclockwise motion? 2. Relevant equations F = qv x B B in a solenoid = (u0)(n)(I) 3. The attempt at a solution I have no idea how to start this problem.