There are four infinite parallel currents arranged in a square of side L. All four currents have the same magnitude (1). Use this X diagram for Questions #7-11. 7. Determine the direction of the net magnetic field at point P. You should certainly include a vector addition diagram as part of your solution. X R 8. Determine the magnitude of the magnetic field at point P. 9. There is a negative charge moving at point P. What velocities can it have so that the magnetic force on it is to the left? Explain your reasoning