Question

A soap bubble is blown with the help of a mechanical pump at the mouth of a tube. The pump produces a certain increase per minute in the volume of the bubble, irrespective of its internal pressure. The graph between the pressure inside the soap bubble and time t will be-

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

$△P=\frac{4T}{r}\therefore △P\propto \frac{1}{r}$