Question

Four charges are arranged at the corners of a square $ABCD$, as shown in the adjoining figure. The force on the charge kept at the centre $O$ is

• A. zero
• B. along the diagonal $AC$
• C. along the diagonal $BD$
• D. perpendicular to side $AB$

Answer 1

The correct option is C along the diagonal $BD$

If we put a unit positve charge at $O$, resultant force due to the charges placed at $A$ and $C$ is zero and resultant force due to charges placed at $B$ and $D$ is towards $D$ along the diagonal $BD$.

Hence, net force is along the diagonal $BD$.