Three positively charged particles, with charges q_1=q,q_2=2q , and q_3=q (where ), are located at the corners of a square with sides of length d . The charge q_2 is located diagonally from the remaining (empty) corner.
Determine the magnitude E_net of the net electric field at point P. Use K for the electrostatic constant. Express your answer in terms of q, d, and K.