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Energy required to form a soap bubble of diameter 20 cm will be (Surface tension for soap solution is 30 dynes/cm )

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Energy required to form a soap bubble of diameter 20 cm will be (Surface tension for soap solution is 30 dynes/cm )
A. `12000 pi ergs`
B. `1200 pi ergs`
C. `2400 pi ergs`
D. `24000 pi ergs`
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Correct Answer - D
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