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The surface tension of a liquid is 5Nm^-...

The surface tension of a liquid is `5Nm^-1`. If a thin film formed on a loop of area `0.02m^-2` then its surface energy will be

A

`5xx10^(2) J`

B

`2.5 xx10^(-2) J`

C

`2xx10^(-1) J`

D

`5 xx10^(-1) J`

Text Solution

Verified by Experts

The correct Answer is:
C
`W = T xx DeltaA = 5 xx 2 xx(0.02)` [Film has two surfaces]
`=2 xx10^(-1)J`
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