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NEET 2010 (AIPMT, Prelims) · Electric Charge & Coulomb's Law

Electric Charge & Coulomb's Law question from NEET 2010 (AIPMT, Prelims)

Q74NEET 2010 · AIPMT · PRELIMSEasy

Electric Charge & Coulomb's Law

Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge on an electron)

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Answer: (c)

Charge on each ion $q = ne$ .
$F = \dfrac{1}{4\pi\varepsilon_0}\dfrac{n^2e^2}{d^2} \Rightarrow n = \sqrt{\dfrac{4\pi\varepsilon_0 F d^2}{e^2}}$
So the answer is (c).

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