MHT CET 2022 Physics question

The amount of work done in blowing a soap bubble such that its diameter increases from 'd' to 'D' is (T = surface tension of solution)

Answer: (D)

Solution

A soap bubble has two free surfaces (inner and outer), so the work done equals increase in total surface area where and . Thus \dfrac{D^2}{4}$ -

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Question ID VK-094218