Question

Four point charges qA = 2 µ C and qB = -5 µ C, qC= 2 µ c and qD = -5 µ c are located at the corners of a square A B C D of side 10 cm. What is the force on a charge of 2 µ c placed at the centre of the square?

Answer 1

Fa = Fc and Fb = Fd

so the net force on the particle is 0