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MHT CET Physics question

PhysicsMechanical Properties of FluidsMHT CET

A glass rod of radius 'r' is inserted symmetrically into a vertical capillary tube of radius 'r' (r < r) such that their lower ends are at same level. The arrangement is dipped in water. The height to which water will rise into the tube will be ( = density of water, T = surface tension in water, g = acceleration due to gravity) [MHT-CET 2020]

Answer: (A)

Solution

Upward force (both circles wet) and weight , so ;

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Question ID VK-062287