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Q.

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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a

1000 dyne

b

1100 dyne

c

1200 dyne

d

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 

Fs=T×2(l+b)=60×2(9.8+0.2)=1200 dyne

Hence the correct answer is 1200 dynes.

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