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A platinum wire ring of radius 2.5 cm fl...

A platinum wire ring of radius 2.5 cm floats horizontally on the surface of water. A vertical force of 0.022 N is required to detach the ring from the surface of water. Then surface tension of water is.

A

`6xx10^-2 N//m`

B

`8xx10^-2 N/m`

C

`7xx10^-2 N/m`

D

`9xx10^-2 N/m`

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