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Equal charges q are placed at the four c...

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

A

`(3q^(2))/(4pi in_(0) a^(2))`

B

`q^(2)/(pi in_(0) a^(2))`

C

`((1+2sqrt(2))/2) q^(2)/(4pi in_(0) a^(2))`

D

`(2+1/sqrt(2)) q^(2)/(4pi in_(0) a^(2))`

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