First slide

Surface tension and surface energy

Question

Two soap bubbles of radii r₁ and r₂ equal to 4 cm and 5 cm are touching each other over a common surface S₁S₂ (shown in figure). Its radius will be

Moderate

A

4 cm
B

20 cm
C

5 cm
D

4.5 cm

Solution

$r = \frac{r_{1} r_{2}}{r_{1} - r_{2}} = \frac{5 \times 4}{5 - 4} = 20 cm$

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