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Q.

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)

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a

3.9 N/m

b

3.9 ×10–2 N/m

c

3.9 ×10–3 N/m

d

3.9 dyne/m

answer is B.

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Detailed Solution

4TR=hdg ∴ T=Rhdg4T=10−2×2×10−3×0.8×103×9.84=3.9×10−2N/m
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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)