Q.

The work done in blowing a soap bubble of radius 0.2 m is (the surface tension of soap solution being 0.06 N/m)

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a

192π×10−4J

b

280π×10−4J

c

200π×10−3J

d

None of these

answer is A.

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Detailed Solution

W=8πr2×T=8π×(0.2)2×0.06=192π×10−4J
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The work done in blowing a soap bubble of radius 0.2 m is (the surface tension of soap solution being 0.06 N/m)