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A horizontal circular loop of wire has radius 0.04 m. It is lowered into a liquid and a film is formed . The force due to the surface tension of the liquid is 0.033 N. Calculate the surface tension of the liquid.

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Data : r = 0.04 m . F = 0.033 N
Force due to the surface tension . F =2 T (2`pir`)
The suface tension , ` T= F/(4 pir) = 0.033/( 4xx 3.142 xx 0.04) = 0.00656 N//m`
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