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Four charges of +q, +q +q and +q are pla...

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

A

`(q^(2))/(8pi in_(0)a^(2)) (1 + 2 sqrt2)`

B

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

C

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

D

zero

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A
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