A square of side a has charge Q at its centre and charge q at one of the corners. The work required to be done in moving the charge q from the corner to the digitally opposite corner is :

Options

A. Zero
B. `(Qq)/(4 pi epsilon_0 a)`
C. `(Qq sqrt2)/(4 pi epsilon_0 a)`
D. `(Qq)/(2 pi epsilon_0 a)`

Answer

A