question_answer

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

A) \[\frac{3{{q}^{2}}}{4\pi {{\varepsilon }_{0}}{{a}^{2}}}\]                 

B) \[\frac{{{q}^{2}}}{4\pi {{\varepsilon }_{0}}{{a}^{2}}}\]

C) \[\left[ \frac{2\sqrt{2+1}}{2} \right]\frac{{{q}^{2}}}{4\pi {{\varepsilon }_{0}}{{a}^{2}}}\]

D)   \[\left[ 2+\frac{1}{\sqrt{2}} \right]\frac{{{q}^{2}}}{4\pi {{\varepsilon }_{0}}{{a}^{2}}}\]