MHT CET 2026 Physics question

Physics Mechanical Properties of Fluids MHT CET 2026

A soap bubble of radius cm is expanded to radius cm. Surface tension of soap solution is 25 dyne/cm. The work done during expansion in erg is

(A)800
(B)1200
(C)1600Correct
(D)2400

Answer: (C)

Solution

A soap bubble has two free surfaces (inside and outside), so the increase in surface area is (r_2^2r_1^2)\dfrac{9}{π}\dfrac{1}{π}$) =

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Question ID VK-100068