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JEE Main 2026 (22 Jan, Shift 2) · Electric Potential & Equipotentials

Electric Potential & Equipotentials question from JEE Main 2026 (22 Jan, Shift 2)

Q4JEE Main 2026 · 22 JAN · SHIFT 2Easy

Electric Potential & Equipotentials

Three small identical bubbles of water having same charge on each coalesce to form a bigger bubble. Then the ratio of the potentials on one initial bubble and that on the resultant bigger bubble is:

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Answer: (a)

Charge is conserved: $Q = nq$ ; volume is conserved: $\frac{4}{3}\pi R^3 = n\cdot\frac{4}{3}\pi r^3 \Rightarrow R = n^{1/3}r$
$V' = \frac{kQ}{R} = \frac{knq}{n^{1/3}r} = n^{2/3}V$
$\frac{V}{V'} = \frac{1}{3^{2/3}}$
So the answer is (a) $1 : 3^{2/3}$ .

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