Four charges are arranged at the comers of a square ABCD as shown in figure. The force on the charge kept at the centre O is

Zero

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Along the diagonal AC

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Along the diagonal BD

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Perpendicular to side AB

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Solution

The correct option is C Along the diagonal BD
The force on the charge at centre O due to charges +q and +q on A and C will be equal and in opposite direction. Force due to charge (+2q) on B will be in direction OD. Force due to charge (-2q) on D will be in direction OD.
$∴$ Net force will be along the diagonal BD.

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