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Q.

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

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a

2πD2T

b

4πD2T

c

6πD2T

d

8πD2T

answer is C.

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Detailed Solution

Work done =4π2×D22−D22T =4πD24[4−1]T=3πD2T Ihere are two surfaces of soap bubble ∴ W=2×3πD2T=6πD2T
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If T is surface tension of soap solution, the amount of work done in blowing a soap bubble from diameter D to a diameter 2 D is