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NEET 1995 (AIPMT) · Electric Charge & Coulomb's Law

Electric Charge & Coulomb's Law question from NEET 1995 (AIPMT)

Q82NEET 1995 · AIPMTEasy

Electric Charge & Coulomb's Law

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

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Answer: (c)

For an end charge $Q$ (separation $2r$ ): $\dfrac{kQ^2}{4r^2} + \dfrac{kQq}{r^2} = 0$ .
$q = -\dfrac{Q}{4}$
So the answer is (c) $-Q/4$ .

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