Given,
Radius of the circular plate, r = 5 cm
Mass, m = 2 gm
Surface tension of water, T = 72 dyne/cm
Weight of plate is, W = mg=2 x 980 = 1960 dyne
The circumference of circular plate is given by,
The down pull on plate due to surface tension is given by,
Therefore, total force required to take plate away from water surface is,
F=W+f
=1960+2260.8
=4220.8 dyne