First slide

Surface tension and surface energy

Question

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)

Moderate

A

$280 π d y n e$
B

$250 π d y n e$
C

$140 π d y n e$
D

$210 π d y n e$

Solution

$Force required, F = 2 π r T = 2 π \times 2 \times 70 = 280 π .Dyne$

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