MHT CET 2025 Physics question
One end of a capillary tube is dipped in water, the rise of water column is 'h'. The upward force of 98 dyne due to surface tension is balanced by the force due to the weight of the water column. The inner circumference of the capillary is
(surface tension of water = Nm)
Answer: (A)
Solution
The upward force due to surface tension acts along the line of contact of the liquid with the tube, i.e. along the inner circumference : , with for water and glass, so . Convert the force to SI: dyne
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