Answer :

Surface tension is related with both angle of contact and dip in the height as,


Where,


h = dip height


ρ = density = 13.6 × 103 kg/m3


g = acceleration due to gravity = 9.81 m/s


r = radius of the dipped tube = 1 × 10-3 m


θ = contact angle = 1400


and, Surface Tension S = 0.465 N/m


Thus, height of dip down,




= -0.00534 m


= -5.34 mm


Negative sign indicates decrease in level of mercury in tube. Hence the mercury level is dipped by 5.34 mm.


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