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Q.

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

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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.

answer is C.

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Detailed Solution

Excess pressure in a soap bubble Δp=4Tr i.e. Δp∝1r. 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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