A proton, at rest in some region of space where there is an electric and magnetic field, experiences a net electromagnetic force of 8.0 x 10-13 N pointing in the positive-x direction. If the same proton then moves with a speed of 1.5 x 106 m/s in the positive-y direction, the net electromagnetic force on it decreases in magnitude to 7.5 x 10-13 N, still pointing in the positive-x direction. Find the magnitude and direction of both the electric field and the magnetic field in which this proton is moving.