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Water rise in a capillary upto an extension heightsuch that upward force of surface tension balancesthe force of 75 × 10-4 N. due to weight of water. Ifsurface tension of water is 6 × 10-2 N/m. Theinternal circumference of the capillary must be :-98.(1) 12.5× 10-2 m(2) 6.5 x 10-2 m(3) 0.5 × 10-2m(4) 1.25 x 102 m |
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Answer» The upward force due to the change in pressure in the capillary.F(up)=∆P*A =(2*S.T.*cos(angle of contact)/R)*πR^2 assuming angle of contact to be zero =2*π*R*S.T.=(circumference)*(6*10^(-2)) This F(up)=75*10^(-4) From there you will get Circumference is 12.5*10^(-2)m. |
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