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The work done in increasing the size of ...

The work done in increasing the size of a soap film from 10 cm × 6 cm to 10 cm × 11 cm is `3 xx10^(-4)` joule . The surface tension of the film is

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
`W = 2T(A_2-A_1) = 2 xx T (110 - 60) xx10^(-4)`
`implies 3 xx10^(-4) = 2xxT xx 50 xx10^(-4)`
`implies T = 3 xx10^(-2) N//m`
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