A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of...

A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on Q is zero, then Q / q equals
[AIEEE 2009; Similar MP PET 2008]
(a) -2 √(2)
(b) -1
(c) 1
(d) -1/√(2)
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[@bhupenderkumar9195]

How 2/√2 become -√2 pls explain

[@KehkashaUsmani-l8n]

Exactly I also don't understand

[@Shiwali-q6f]

KQ²/2a² = - 2/√2×√2/√2 ( + ) main tha (=) main shift karenge to ( - )hoga = -2√2/2 (2 cancle each other = -√2