Two point charges are on the y-axis. One, with charge a of +q, is located at point a. The other, with a charge of +2q is located at point -a. Determine the magnitude and direction of the electric field at the origin. Express answers in terms of q,a, and constants.
The Attempt at a Solution
Do i just do k(2q)/a^2 - k(q)/a^2 and that's the answer?
K(2q)/a^2 - k(q)/a^2= kq/a^2
this in preparation of the ap exam and i learned this last semester so i just need a little refreshing