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

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

(a)   30  dynes (b)  60 dynes (c)   750 dynes (d)  750 π dynes Ans. d (47)
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