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Coefficient of Viscosity

Two soap bubb...

Question

Two soap bubbles each of radius r are touching each other. The radius of curvature of the common surface will be:

A

Infinite

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B

2 r

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C

r

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D

r / 2

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Solution

The correct option is A Infinite
Radius of curvature of common surface $\frac{1}{R} = \frac{1}{R_{1}} - \frac{1}{R_{2}}$
where $R_{1} = R_{2} = r$
Or $\frac{1}{R} = \frac{1}{r} - \frac{1}{r} = 0$
$⟹ R = \infty$

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