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45. The force required to take away a flat circular plate of radius 2 cm from the surface of water, will be (the surface tension of water is 70 dyne/cm)

(a) 280  π dyne

(b) 250 π dyne

(c)  140 π dyne

(d) 210 π dyne

Ans. a

(38)

5/5 - (1 vote)

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