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)` joule

B

`2.0xx10^(-2)` joule

C

`4xx10^(-2)` joule

D

`0.8 xx10^(-2)` joule

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The correct Answer is:

B

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