First slide

Surface tension and surface energy

Question

A shell having a hole of radius r is dipped in water. It holds the water upto a depth of h then the value of r is

Moderate

A

$r = \frac{2 T}{h d g}$
B

$r = \frac{T}{h d g}$
C

$r = \frac{T g}{h d}$
D

None of these

Solution

$\frac{2 T}{r} = h d g \Rightarrow r = \frac{2 T}{h d g}$

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