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A wire ring of 9/11 cm. radius and negli...

A wire ring of 9/11 cm. radius and negligible weight rests flat on the surface of a liquid and then raised. The pull required is 3 gm wt. before the flim breaks. If `g=10m//s^(2)` calculate the surface tension of the liquid.

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The correct Answer is:
291.7 dyne/cm
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