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A ring of inner and outer radii 8 and 9 ...

A ring of inner and outer radii 8 and 9 cm is pulled out of water surface with a force of [S.T of water `(T)=70"dyne"//cm]`

A

`26xx10^(-2)N`

B

`12.6xx10^(-2)N`

C

`7.48xx10^(-2)N`

D

`3.08xx10^(-2)N`

Text Solution

Verified by Experts

The correct Answer is:
C
`F=2pi(r_(1)+r_(2))T`
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