Consider a circular plate of radius 5 cm...

Consider a circular plate of radius 5 cm placed on the surface of a water body such that their planes are parallel. Force necessary to pull the circular plate from water surface for which surface tension is `75 "dyne" cm^(-1)` is:

30 dyne

60 dyne

750 dyne

`750 pi` dyne

Text Solution

Verified by Experts

The correct Answer is:

The length of the circular plate on which the force will act = `2piR`
Force to pull = (surface tension) `xx` (length)
`F = 75 xx 2pi xx 5`
`F = 750 pi` dyne

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