A positive charge q = +8 nC is at the origin, and a second positive charge q = +12 nC is on the x axis at a = 4 m, Find the net electric field (a) at point P, on the x axis at x=7 m, and (b) at point P on the x axis at x=3 m. 91-+8nC P 1 2 3 12=+12nC kgi P E 2 x, m 7