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Q.

A soap bubble is blown slowly at the end of a tube by a pump supplying air at a constant rate. Which one of the following  graphs represents the correct variation of the excess of pressure inside the bubble with time?

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a

b

c

d

answer is B.

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Detailed Solution

As time goes  on radius increases and hence the pressure decreases hence P - t graph is rectangular hyperbola.  2 nd option is correct.
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