4. Two parallel glass plates are dipped partly in the liquid of density ‘d’ keeping them vertical. If the distance between the plates is ‘x’, surface tension for liquids is T and angle of contact is θ, then rise of liquid between the plates due to capillary will be
(a) T cosθ/xd
(b) 2T cosθ/xdg
(c) 2T/xdg cosθ
(d) T cosθ/xdg
Ans. b
(9)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)