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Question: If the excess pressure inside a soap bubble is balanced by oil column of height 2 mm, then the surfa...

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

Answer

3.9 ×10­–2 N/m

Explanation

Solution

T=Rhdg4T = \frac { R h d g } { 4 }

T =3.9×10−2 N/m= 3.9 \times 10 ^ { - 2 } \mathrm {~N} / \mathrm { m }