Question

# Due to capillary action, a liquid will rise in a tube if angle of contact is

A
acute
B
obtuse
C
900
D
zero

Solution

## The correct option is A acuteAccording to ascent formula the height/depth $$h$$ through which a liquid will rise/fall in a capillary tube of radius $$r$$  is given by  $$h = \dfrac{2S \cos\theta}{ r \rho g}$$where $$S$$ is the surface tension, $$\rho$$ is the density of the liquid and $$\theta$$ is the angle of contact.If $$\theta<90^o \Rightarrow \cos \theta >0 \Rightarrow h>0 \Rightarrow$$ The liquid will rise when contact angle is acute. If $$\theta>90^o \Rightarrow \cos \theta <0 \Rightarrow h<0 \Rightarrow$$ The liquid will fall when contact angle is obtuse. Physics

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