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Capillary Action

A soap bubble...

Question

A soap bubble is being blown on a tube of radius 1cm. The surface tension of the soap solution is 0.05 N/m and the bubble makes an angle of $60^{\circ}$ with the tube as shown. The excess of pressure in the tube is:

A

5Pa

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B

1 Pa

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C

10Pa

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D

20Pa

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Solution

The correct option is C 10Pa
$R = 2 c m; Δ P = \frac{4 S}{R} = \frac{4 \times 0.05}{2 \times 10^{- 2}} = 10 P a$

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