A frame made of a metallic wire enclosing a surface area A is covered with a soap film . If the area of the frame of metallic wire will be changed by
A frame made of a metallic wire enclosing a surface area A is covered with a soap film . If the area of the frame of metallic wire will be changed by
A. 1
B. 0.5
C. 0.75
D. 0.25
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Correct Answer - B
`(E_(2))/(E_(1)) = (A_(2))/(A_(2)) = 50/100 = 0.5`
`E_(2) = 50 ` % E
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