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Four charges of +q, -q, +q and +q are pl...

Four charges of +q, -q, +q and +q are placed at the corners A, B, C and D of a square. The resultant force on the charge at D is

A

`(q^(2))/(4pi epsi_(0) a^(2)) (sqrt2 - (1)/(2))`

B

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

C

`(q^(2))/(8pi epsi_(0)a^(2)) 2 sqrt2`

D

zero

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A
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