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
(7)