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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a