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Two large vertical glass plates are held parallel, 1 mm apart, dipped in a tank of water. To what height does water rise in the gap between the plates? (Surface tension of water = 0.075 N/m, contact angle = 0 deg, g = 9.8 m/s²)
- 1.5 cm
- 1.8 cm
- 2.5 cm
- 3.0 cm
Correct answer: 1.5 cm
Solution
Between two parallel plates the curved meniscus is cylindrical, giving a rise h = 2T/(rho*g*d), half the dependence form of a circular capillary but using the plate spacing d.
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