Force is equal to the charge times the electric field, plus the cross product of charge times the velocity and magnetic flux density.

F = qE + qv x B

Correct me if I'm a retard, but wouldn't this mean that you use your index finger to represent current, your middle finger to represent the polarity of the magnetic field, and you thumb to represent the force? A lot of the images I see represent current with the middle finger and magnetic field polarity with the index finger, which is opposite.