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MHT CET Physics question

PhysicsMechanical Properties of FluidsMHT CET

If 500 erg of work is done in blowing a soap bubble of radius 'r' then the additional work required to be done to blow it to a radius equal to '3r' will be [MHT-CET 2019]

Answer: (A)

Solution

, so the work for radius is erg and the additional work is $4500 - 500

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Question ID VK-062341