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Q.

The work done in blowing a soap bubble of 10 cm radius is (Surface tension of the soap solution is 3100N/m )

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a

75.36×10−4joule

b

37.68×10−4joule

c

150.72×10−4joule

d

75.36 joule

answer is A.

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Detailed Solution

W=8πR2T=8×3.14×10×10−2×3100=7.536×10−3J
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The work done in blowing a soap bubble of 10 cm radius is (Surface tension of the soap solution is 3100N/m )