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A charge q is placed at the centre of the line joining two exactly equal positive charges Q.

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A charge q is placed at the centre of the line joining two exactly equal positive charges Q. The system of three charges will be in equilibrium, if q is equal to

(a) -Q

(b) Q/2

(c) -Q/4

(d) +Q

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Correct option  (c) -Q/4

Explanation:

For equilibrium of charge Q, the force of repulsion due to similar charges Q should be balanced by, the force of attraction due to charge q and

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