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25. The maximum force, in addition to the weight required to

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

(a) 7.28 N/cm

(b) 7.28 dyne/cm

(c)   72.8 dyne/cm

(d) 7.28×102 dyne/cm

Ans. c

(8)

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