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If work done in increasing the size of a...

If work done in increasing the size of a soap film from 10 cm x 6 cm to 10 cm x 11 cm is `2xx10^(-4) J`, then the surface tension is

A

`2xx10^(-2)Nm^(-1)`

B

`2xx10^(-4)Nm^(-1)`

C

`2xx10^(-6)Nm^(-1)`

D

`2xx10^(-8)Nm^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`T=(W)/(DeltaA)=(2xx10^(-4))/(2xx(50xx10^(-4)))=2xx10^(-2)N//m`.
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