(a) 30 dynes (b) 60 dynes (c) 750 dynes (d) 750 π dynes Ans. d (37)
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