Three Charges

Three charges are fixed in place as shown. The squares in thegrid have sides of length s = 0.24 m. The magnitude ofq is 3 mu or micro Coulombs (1 mu or micro Coulomb = 10-6 Coulombs), while themagnitude of Q is 4.5 mu or micro Coulombs. What is the magnitude of the net force onq due to the other two charges?

F+q = N