The force required to take away a flat plate of radius 4 cm from the surface of water is (surface tension of water = 70 dyne/cm)

1758.4 dyne/cm

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1645.3 dyne/cm

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1221.2 dyne/cm

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1589. 2 dyne/cm

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Solution

The correct option is A
1758.4 dyne/cm

Force due to surface tension acts all along the circumference of the circular plate. Therefore, force required to take away of plate is,

F = T x 2πr = 70 x 2 x 3.14 x 4 = 1758.4 dyne/cm

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