Three soap bubbles A, B and C are formed at the opened ends of a T-shaped pepe. S is a stop cock and initially it is closed. Bubbles B and C are same in size and A has the smallest radius. Then after S is opened

Moderate

A

A will grow in size and size of B and C will be reduced.
B

radii of A and C will decrease and that of B will increase
C

radii of B and C will increase and finally become equal whereas the radius of A will reduce and finally become zero
D

radii of A and B will increase and finally become equal where as the radius of C will decrease and finally become zero.

Solution

Excess pressure in a soap bubble $Δp = \frac{4 T}{r} i . e . Δp \propto \frac{1}{r}$ . Therefore initially $Δp$ is maximum in A and are equal in B and C. So after S is opened, air will start flowing from A into B and C. Hence option - (3) is correct.

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