The maximum force, in addition to the weight required to pull a wire of 5.0 cm long from the surface of water at temperature 20oC is 728 dynes. The surface tension of water is

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7.28 N/cm

7.28 dyne/cm

72.8 dyne/cm

7.28 x 102 dyne/cm

answer is C.

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Detailed Solution

T=F2l=7282×5∴T=72.8 dyne /cm

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