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JIPMER 2009
Exam
JIPMER
Year
2009
Subject
Physics
Chapter
Mechanical Properties of Fluids

JIPMER 2009 · Physics · Mechanical Properties of Fluids

A frame made of metallic wire enclosing a surface area A is covered...

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

Options

  1. A100%100 \%
  2. B75%75 \%
  3. C50%50 \%
  4. D25%25 \%

Correct answer

C. 50%50 \%

Step-by-step solution

Surface energy = surface tension ×\times surface area E=T×2AE=T \times 2 A New surface energy, E1=T×2(A2)=T×A%E_1=T \times 2\left(\frac{A}{2}\right)=T \times A \% decrease in surface energy =E−E1E×100=2TA−TA2TA×100=50%\begin{aligned} & =\frac{E-E_1}{E} \times 100 \\ & =\frac{2 T A-T A}{2 T A} \times 100=50 \% \end{aligned}
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