1. The problem statement, all variables and given/known data At a particular instant a proton is traveling in the +z direction, with speed 4105 m/s. At the location of the proton there is a magnetic field of magnitude 0.25 T in the +x direction, due to current running in a nearby coil. what is the direction and magnitude of force on the proton? 2. Relevant equations none i think? 3. The attempt at a solution Do you use the right hand rule possibly?