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MHT CET Physics question

PhysicsMechanical Properties of FluidsMHT CET

In air, a charged soap bubble radius ‘r’ is in equilibrium having outside and inside pressures being equal. The charge on the drop is ( = permittivity of free space, T = surface tension of soap solution)

Answer: (D)

Solution

The electrostatic pressure balances the pressure due to the two surfaces of the bubble, so

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Question ID VK-075725