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The length of one edge of a glass plate of thickness 0.2 cm is 9.8 cm. If this edge of the glass pate 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)

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1000 dyne

1100 dyne

1200 dyne

2400 dyne

answer is D.

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Detailed Solution

The glass plate's length and thickness are affected by surface tension.

Total length at which Surface tension acts is

$F_{s} = T \times 2 (l + b) = 60 \times 2 (9.8 + 0.2) = 1200 dyne$

Hence the correct answer is 1200 dynes.

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