A thin solid square plate is placed gently on a liquid surface. The excess force required to lift the plate away from the surface is 12 mN . If the surface tension of the liquid is 0.06 N m^ -1 , the side length of the

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Correct answer: D. 5 cm

For a solid square plate, only the outer perimeter is in contact with the liquid surface.

Total effective length of contact,

L_{\text{eff}} = 4a

, where

a

is the side length of the plate.

Excess force required,

F = T \times L_{\text{eff}} = T \times 4a

12 \times 10^{-3} = 0.06 \times 4a

4a = \dfrac{12 \times 10^{-3}}{0.06} = 0.2\text{ m}

a = 0.05\text{ m} = 5\text{ cm}

Answer:

5\text{ cm}

A thin solid square plate is placed gently on a liquid surface. The...

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