The rings of radius 1m is lying on the surface of liquid. It is lifted from the liquid surface by a force of Newtons in such a way that the liquid film in it remains intact. The surface tension of liquid will be:
A
12πN/m
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B
1πN/m
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C
13πN/m
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D
14πN/m
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Solution
The correct option is D1πN/m The force acting on the ring against the lift=2×Tl
where l is the length of ring in contact with water surface, and factor of 2 is included because of the inner and outer surfaces of the ring