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Q.

Surface tension of oil is 34 dynes/cm. Then find the excess pressure of a drop of oil of radius 1 mm

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a

68N/m2

b

125N/m2

c

136N/m2

d

272N/m2

answer is A.

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Detailed Solution

Δp=2Tr=2×34×10−5/10−21×10−3N/m2=68N/m2
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Surface tension of oil is 34 dynes/cm. Then find the excess pressure of a drop of oil of radius 1 mm