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9.2 , surface tension — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.2 , surface tension1 Mark
MCQ
Two long parallel glass plates has water between them. Contact angle between glass and water is zero. If separation between the plates is $'d'$ ( $d$ is small). Surface tension of water is $'T'$ . Atmospheric pressure = $P_0$ . Then pressure inside water just below the air water interface is 
  • A
    ${P_0} + \frac{{2T}}{d}$
  • B
    ${P_0} + \frac{{2T}}{{\left( {d/2} \right)}}$
  • C
    ${P_0} + \frac{{8T}}{d}$
  • ✓
    ${P_0} - \frac{{2T}}{d}$
✓

Answer

Correct option: D.
${P_0} - \frac{{2T}}{d}$
d

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