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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a