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Q.

Excess pressure in a soap bubble is 10 N/m2. If radius of the soap bubble is 5 mm, the total surface energy stored in the bubble is

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a

12.45 μJ

b

6.75 μJ

c

5.25 μJ

d

7.85 μJ

answer is D.

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Detailed Solution

ΔP =4Tr⇒4T=r.ΔPTotal surface energy, U=4πr2T×2=2πr3.ΔP⇒U=2×3.14×5×10−33×10J=7.85 μJ
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