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Q.

If T is the surface tension of soap solution, the amount of work done in blowing a soap bubble from a diameter D to 2D is

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a

2πD2T

b

4πD2T

c

6πD2T

d

8πD2T

answer is C.

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Detailed Solution

Work done to increase the diameter of bubble from d to D W=2π(D2−d2)T=2π[(2D)2−(D)2] T=6πD2T
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