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Q.

The diagram below shows three soap bubbles A, B and C prepared by blowing the capillary tube fitted with stop cocks S, S1, S2 and S3. When all the three stop cocks S1, S2 and S3 are opened and S closed, then

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a

B will start collapsing with the increasing volume of A and C

b

C will start collapsing with the increasing volume of A and B

c

volumes of A, B and C will become equal at equilibrium

d

C and A will both start collapsing with the increasing volume of B

answer is D.

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Detailed Solution

The excess pressure inside a bubble of soap is given by p=4TrIt means excess pressure inside the bubbles A and C is more than inside B. So, air will go towards B from A and C. So, A and C will start collapsing with the increasing volume of B.

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