In a U-tube the radii of two columns are respectively r 1 and r 2 . When a liquid of density ρ , contact angle θ = 0 o is filled in it, a level difference of h is observed in the two arms, then the surface tension of the liquid is

Question

In a U-tube the radii of two columns are respectively r 1 and r 2 . When a liquid of density ρ , contact angle θ = 0 o is filled in it, a level difference of h is observed in the two arms, then the surface tension of the liquid is, ρ g h r 1 r 2 2 ( r 2 – r 1 ), h ρ g ( r 2 – r 1 ), h ρ g ( r 2 – r 1 ) 2, h ρ g 2 ( r 2 – r 1 )

MARKS App · Accepted Answer

ρ g h = 2 T 1 r 1 – 1 r 2 = 2 T r 2 – r l r 1 r 2 ∴ T = ρ g h r 1 r 2 2 ( r 2 – r 1 )

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