First slide

Surface tension and surface energy

Question

Water rises upto a height h in a capillary on the surface of earth in stationary condition. Value of h increases if this tube is taken

Moderate

A

On sun
B

On poles
C

In a lift going upward with acceleration
D

In a lift going downward with acceleration

Solution

If lift moves downward with some acceleration then effective g decreases, so h increases.
$As h = \frac{2 Tcos θ}{rdg} ∴ h \propto \frac{1}{g}$

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