Question

Assertion (A) : A large soap bubble expands while a small bubble shrinks, when they are connected to each other by a capillary tube.
Reason (R) : The excess pressure (due to surface tension) inside a spherical bubble is more due to its small volume.

• A. Both Assertion (A) and Reason (R) are true and the Reason (R) is correct explanation of the Assertion(A) .
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not correct explanation of the Assertion(A) .
• C. Assertion (A) is true, but the Reason (R) is false.
• D. Assertrion (A) is false, but the Reason (R) is true.

Answer 1

Answer: (A)

Both Assertion (A) and Reason (R) are true and the Reason (R) is correct explanation of the Assertion(A) .

$P_{ex}=\frac{4T}{r}$
$P_{ex}\propto \frac{1}{r}$
$\therefore$ In order to increase pressure inside. the larger one and decrease that in a smaller one, larger one expands and small bubble shrinks