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The work done in increasing the size of ...

The work done in increasing the size of a rectangular soap film with dimensions 8 cm x 3.75 cm to 10 cm x 6 cm is `2 xx 10^(-4) J`. The surface tension of the film in `(N m^(-1))` is

A

`165xx10^(-2)`

B

`3.3xx10^(-2)`

C

`6.6xx10^(-2)`

D

`8.25xx10^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`T=(W)/(DeltaA)rArr w=2DeltaAT` (Soap film have two surface areas)
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