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At the corners A, B, C of a square ABCD,...

At the corners A, B, C of a square ABCD, charges `10mC, -20 m C and 10mC` are placed. The electric intensity at the centre of the square to become zero, the charge to be placed at the corner D is

A

`-20 mC`

B

`+ 20 mC`

C

30 mC

D

`-30 mC`

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