Basic Maths and Units and DimensionsHard

Question

A ring is cut from a platinum tube 8.5 cm internal and 8.7 cm external diameter. It is supported horizontally from the pan of a ballance, so that it comes in contact with the water in a glass vessel. If an extra 3.97. If is requruired to pull it away from water, the surface tensi0on of water is

Options

A.72 dyne cm-1
B.70.80 dyne cm-1
C.63.35 dyne cm-1
D.60 dyne cm-1

Solution

(2πr1 + 2πr2) σ = mg
σ = 3.97 × 980
⇒ σ = 72 dyne cm-2

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