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MHT CET 2026 (13 May, Shift 2) · Force due to Surface Tension

Force due to Surface Tension question from MHT CET 2026 (13 May, Shift 2)

Q4MHT CET 2026 · 13 MAY · SHIFT 2Medium

Force due to Surface Tension

What is the radius of the biggest aluminium coin of thickness $t$ and density $\rho$ , which will be able to float on the water surface of surface tension $T$ ? ( $g$ = acceleration due to gravity)

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Answer: (c)

Surface tension acts along the rim: upward force $= 2\pi R T$ .
Weight $= \pi R^2 t \rho g$ .
Balance: $\pi R^2 t\rho g = 2\pi R T \Rightarrow R = \dfrac{2T}{\rho g t}$ .
So the answer is (c).

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