Question

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 the liquid is T and angle of contact is q, then rise of liquid between the plates due to capillary will be

• A. $\frac{Tcos\theta }{xd}$
• B. $\frac{2Tcos\theta }{xdg}$
• C. $\frac{2T}{xdgcos\theta }$
• D. $\frac{Tcos\theta }{xdg}$

Answer 1

The correct option is B

$\frac{2Tcos\theta }{xdg}$

Surface tension force = weight of liquid

$T\left(2l\right)\left(cos\theta \right)=dxlhg$

$h=\frac{2Tcos\theta }{xdg}$