Charges Q are placed at the ends of a di...

Charges Q are placed at the ends of a diagonal of a square and charges q are placed at the other two corners. The conditions for the net electric force on Q to be zero is

`Q=-2sqrt2q`, being-ve

`Q=-q/2`, q being -ve

`Q=2sqrt2q`,q being -ve

`Q=2q`, q being -ve

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