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The work done is increasing the size of ...

The work done is increasing the size of a soap film from 10 cm `xx` 6 cm to 10 cm `xx` 11 cm is ` 3 xx 10^(-4)` joule. The surface tension of the film is

A

`3.0xx10^(-2)N//m`

B

`6.0xx10^(-2)N//m`

C

`1.5xx10^(-2)N//m`

D

`11.0xx10^(-2)N//m`

Text Solution

Verified by Experts

The correct Answer is:
A
The work …………..
`(10xx11-10xx6)xx10^(-4)xx2T=Delta w`
`50xx10^(-4)xx2T = 3xx10^(-4)`
`implies T = (3)/(100) = 3xx10^(-2)N//m`
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