The surface tension of liquid is 0.5 N /...

The surface tension of liquid is 0.5 N / m . If a film is held on a ring of area 0.02 m 2, its surface energy is

A

`5xx10^(-2) j

B

`2.5xx10^(-2) j

C

`2xx10^(-1) j

D

`3xx10^(-1) j

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