1. The problem statement, all variables and given/known data A proton travelling at a speed of 3.00*10^6 m/s north through a magnetic field experiences a force of 1.50*10^-14N up. What is the magnitude and direction of the magnetic field? Include the physics principle 2. Relevant equations Fm=qvB 3. The attempt at a solution I solved for a B of 3.13*10^-2T but my problem lies in applying the hand rules to find the direction of the field. Which of the directions, north or up would be referring to the piece of paper that the question is on? And would the physics principle be unbalanced forces?