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Bernoulli's Principle

The length of...

Question

The length of one edge of a glass plate of thickness 0.2 cm is 9.8 cm. If this edge of the glass plate touches the surface of a liquid of surface tension 60 dyne/cm, then it ispulled down with a force of (Assume that angle of contact to be zero)

A

1100 dyne

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B

2400 dyne

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C

1000 dyne

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D

1200 dyne

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Solution

The correct option is B 1200 dyne
Surface tension acts along the length and thickness of the glassplate. Total length where ST acts $= 2 l + 2 t = 20 c m$
Total pulling down force $= 20 \times 60 = 1200 d y n e s$

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