28. If the excess pressure inside a soap bubble is balanced by oil column of height 2 mm, then the surface tension of soap solution will be (r = 1 cm and density d = 0.8 gm/cc)
(a) 3.9 N/m
(b) 3.9 ×10–2 N/m
(c) 3.9 ×10–3 N/m
(d) 3.9 dyne/m
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a