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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 

(8)

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