Question

Four point charges each with charge +q are placed at the four corners of a square of edge length l and a charge $\frac{-q}{4}$ is at centre of the square. Force on the charge at the centre due to other charges is

• A. Zero
• B. $\frac{\sqrt{2}{q}^2}{4\pi {\epsilon }_0{I}^2}$
• C. $\frac{q^2}{4\pi {\epsilon }_0{I}^2}$
• D. $\frac{2\sqrt{2}{q}^2}{4\pi {\epsilon }_0{I}^2}$

Answer 1

The correct option is A Zero

By symmetry net force on charge at centre is zero.