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Force necessary to pull a circular plate of 5cm raduis from water surface for which surface tension is 75 dynes/cm, is

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Force necessary to pull a circular plate of 5cm raduis from water surface for which surface tension is 75 dynes/cm, is
A. 30 dynes
B. 60 dynes
C. 750 dynes
D. 750 `pi` dynes
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Correct Answer - D
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