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11. A capillary tube of radius r is dipped in a liquid of density ρ and surface tension S. If the angle of contact is θ, the pressure difference between the two surfaces in the beaker and the capillary

(a)(S/r) cos θ

(b) (2S/r) cos θ

(c)  S/r cos θ

(d)  2S/r cos θ

Ans. b

(7)

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