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Q.

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)

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a

280π dyne

b

250π dyne

c

140π dyne

d

210π dyne

answer is A.

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Detailed Solution

Force required, F=2πrT=2π×2×70=280π.Dyne
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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)