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Two separate air bubbles (radii 0.002 cm...

Two separate air bubbles (radii `0.002 cm` and `0.004`) formed of the same liquid (surface tension `0.07 N//m`) come together to form a double bubble. Find the radius and the sense of curvature of the internal film surface common to both the bubbles.

A

0.001cm

B

0.002 cm

C

0.004 cm

D

0.003 cm

Text Solution

Verified by Experts

The correct Answer is:
C
`r=(r_(1)r_(2))/(r_(2)-r_(1))`
as the excesspressure is always towards concave surface & pressure in smaller bubble is greater than larger bubble, the common surface is concave towards the centre of the small bubble.
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