Equal charges q are placed at the four corners A, B, C, D of a square of length a. The magnitude of the force on the charge at B will be

Options

A. `(3q^2)/(4 pi epsi_0 a^2)`
B. `(4q^2)/(4 pi epsi_0 a^2)`
C. `[(1+2 sqrt(2))/(2)] (q^2)/(4 pi epsi_0 a^2)`
D. `[2+ (1)/( sqrt(2))](q^2 )/(4 pi epsi_0 a^2)`

Answer

C