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MHT CET 2025 (23 Apr, Shift 1) · Force due to Surface Tension

Force due to Surface Tension question from MHT CET 2025 (23 Apr, Shift 1)

Q6MHT CET 2025 · 23 APR · SHIFT 1Medium

Force due to Surface Tension

A disc of paper of radius ' $R$ ' has a hole of radius ' $r$ '. It is floating on a liquid of surface tension ' T '. The force of surface tension on the disc is

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Answer: (b)

Surface tension acts along every boundary in contact with the liquid surface.
Outer edge length $2\pi R$ , inner (hole) edge length $2\pi r$ .
$F = T(2\pi R + 2\pi r) = 2\pi T(R + r)$ . So the answer is (b).

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