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A ring is cut from a platinum tube 8.5 c...

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

A

`7.2 xx 10^(-2) Nm^(-1)`

B

`3.6 xx 10^(-2) Nm^(-1)`

C

`1.8 xx 10^(-2) Nm^(-1)`

D

`2.4 xx 10^(-2) Nm^(-1)`

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