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A frame made of metalic wire enclosing a...

A frame made of metalic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metallic wire is reduced by `50%` the energy of the soap film will be changed by:

A

`100%`

B

`75%`

C

`50%`

D

`25%`

Text Solution

Verified by Experts

The correct Answer is:
C
`W = T xx 2A`
`W_1 = T xx 2 (A//2) = T xxA`
% decreases in energy
`(W-W_1)/Wxx100 = (2TA-TA)/(2TA)=50%`
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