Three equal charges each 'q' are placed at three corners of a square of side a. The magnitude of electric field at the fourth corner will be

Options

A. `(3q)/(4piepsilon_0a^2)`
B. `(4q)/(4piepsilon_0a^2)`
C. `[(1+2sqrt2)/2](q)/(4piepsilon_0a^2)`
D. `[2+1/sqrt2](q)/(4piepsilon_0a^2)`

Answer

C