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 is pulled
down with a force of (Assume that angle of
contact to be zero)
1) 1100 dyne
3) 1000 dyne
2) 2400 dyne
4) 1200 dyne
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 is pulled
down with a force of (Assume that angle of
contact to be zero)
1) 1100 dyne
3) 1000 dyne
2) 2400 dyne
4) 1200 dyne
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Answer: Surface tension acts along the length and thickness of the glassplate.
Total length where ST acts =2l+2t=20cm
Total pulling down force =20×60=1200 dynes