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Two vertical parallel glass plates are partially submerged in water. The distance between the plates is d and the length is `l`. Assume that the water between the plates does not reach the upper edges of the plates and the plates and the wetting is complete. The water will rise to height (`rho=` density of water and `alpha =` surface tension of water)
A. `(2sigma)/(rhogd)`
B. `(sigma)/(2rhogd)`
C. `(4sigma)/(rhogd)`
D. `(5sigma)/(rhogd)`

1 Answer

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Correct Answer - A
Total upward force due to surface tension `=2sigmal`
Weight of lifted liquid `=(h//d)rhog`
Equating, we get `h=(2sigma)/(rhogd)`

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