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A wire ring of diameter 14cm is gently l...

A wire ring of diameter `14cm` is gently lowered on to a liquid surface and then pulled up. When the film just breaks, the force required is `0.0616N`. The surface tension of the liquid is

A

`70Nm^-1`

B

`7Nm^-1`

C

`70dynecm^-1`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
`2xx2pirxxsigma=0.0616xx10^5`
or `sigma=(6160)/(2xx2xx((22)/(7))xx7)dyn ecm^-1`
`=70dyn ecm^-1`
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