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Q.

The work done to blow a bubble is W. The extra work to be done to double its radius is

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a

W

b

2W

c

3W

d

4W

answer is C.

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Detailed Solution

W1=8πR2T;W2=32πR2TΔW=W2−W1=24πR2T⇒ΔW=3W
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