MHT CET 2026 Physics question

Physics Mechanical Properties of Fluids MHT CET 2026

If 450 erg of work is done in blowing a soap bubble of radius 'r', the additional work required to be done to blow it to a radius equal to 3r is

(A)2400 erg
(B)3000 erg
(C)3600 ergCorrect
(D)4000 erg

Answer: (C)

Solution

Work done in blowing a soap bubble of radius is , so . For radius : erg. Additional work $= W' - W =

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Question ID VK-101570