Rankers Physics
Topic: Solid and Fluids
Subtopic: Surface Tension and Viscosity

The radii of the two columns in U tube are r1 and r2 (r1 > r2). When a liquid of density \[\rho\] (angle of contact is 0ยบ) is filled in it, the level difference of liquid in two arms is h. The surface tension of liquid is (g = acceleration due to gravity):
\[\frac{\rho ghr_{1}r_{2}}{2(r_{1}-r_{2})}\]
\[\frac{\rho gh(r_{1}-r_{2})}{2r_{1}r_{2}}\]
\[\frac{2 (r_{2}-r_{1})}{\rho ghr_{1}r_{2}}\]
\[\frac{\rho gh}{2(r_{2}-r_{1})}\]

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