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Equalc harges q are placed at four corne...

Equalc harges q are placed at four corners A, B, C and D of a square of length a. the magnitude of the force on the charge at B will be

A

`(3q^2)/(4piepsilon_0a^2)`

B

`(4q^2)/(4piepsilon_0a^2)`

C

`((1+2sqrt2)/2)(q^2)/(4piepsilon_0a^2)`

D

`(2+1/(2sqrt2))(q^2)/(4piepsilon_0a^2)`

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