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The three charges q/2. q and q/2 are pla...

The three charges q/2. q and q/2 are placed at the corners A, B and C of a square of side 'a' as shown in figure. The magnitude of electric field (E) at the comer D of the square, is :

A

`q/(4piin_0a^2)(1/(sqrt2)+1/2)`

B

`q/(4piin_0a^2)(1+1/(sqrt2))`

C

`q/(4piin_0a^2)(1-1/(sqrt2))`

D

`q/(4piin_0a^2)(1/(sqrt2)-1/2)`

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