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NEET 2012 (AIPMT, Prelims) · Electric Potential & Equipotentials

Electric Potential & Equipotentials question from NEET 2012 (AIPMT, Prelims)

Q114NEET 2012 · AIPMT · PRELIMSEasy

Electric Potential & Equipotentials

Four point charges $-$ Q, $-$ q, 2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is

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Answer: (a)

All four charges are at the same distance $a$ from the centre, so $V = \frac{k}{a}(-Q - q + 2q + 2Q)$
$V = \frac{k}{a}(Q + q) = 0 \Rightarrow Q = -q$
So the answer is (a) $Q = -q$ .

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