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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

(4)

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