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A disc of radius R has a concentric hole...

A disc of radius R has a concentric hole of radius r. It is floating on a liquid of surface tension T . What is the force of surface tension on the disc ?

A

`4pi(R+r)T`

B

`4pi(R-r)T`

C

`2pi(R-r)T`

D

`2pi(R+r)T`

Text Solution

Verified by Experts

The correct Answer is:
D
`S.T = F/T " " :. F = T xx L `
In this case , `L = 2 piR + 2pi r = 2 pi (R+r)`
` :. F = 2pi (R+r) T `
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