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MHT CET Physics question

PhysicsMechanical Properties of FluidsMHT CET

Surface tension of soap solution is 'T'. A charged soap bubble of radius 'r' is in equilibrium with outside and inside pressure being equal. The charge on the drop is ( = permittivity of free space) [MHT-CET 2019]

Answer: (C)

Solution

Outward electrostatic pressure equals the inward excess pressure , so

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Question ID VK-062337