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 $d = 0.8\, gm/cc$)
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
$3.9\, dyne/m$
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- [AIEEE 2004]
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