Physics
Fluid-Mechanics
Easy

Question

Two very wide parallel glass plates are held vertically at a small separation d and dipped in water. Some water climbs up in the gap between the plates. Let S be the surface tension of water, p0 = atmospheric pressure, p = pressure of water just below the water surface in the region between the plates. Then (assume hemispherical meniscus)

  1. p equals p subscript 0 minus fraction numerator 2 S over denominator d end fraction
  2. p equals p subscript 0 plus fraction numerator 2 S over denominator d end fraction
  3. p equals p subscript 0 minus fraction numerator 4 S over denominator d end fraction
  4. p equals p subscript 0 plus fraction numerator 4 S over denominator d end fraction

The correct answer is: p equals p subscript 0 minus fraction numerator 2 S over denominator d end fraction

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