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QJEEM12Phda5e: JEE Main 2012 Physics - Class 11 JEEM12Phda5e Solution: A thin liquid film formed between a U-shaped wire and a light…

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5×10−2  N1.5 \times {10^{ - 2}}\,\,N (see figure). The length of the slider is 3030 cmcm and its weight negligible. The surface tension of the liquid film is AIEEE 2012 Physics - Properties of Matter Question 244 English

Multiple Choice Options

  • A 0.0125  Nm−10.0125\,\,N{m^{ - 1}}
  • B 0.1  Nm−10.1\,\,N{m^{ - 1}}
  • C 0.05  Nm−10.05\,\,N{m^{ - 1}}
  • D 0.025  Nm−10.025\,\,N{m^{ - 1}}

Step-by-Step Verified Solution

At equilibrium,
2Tl=mg2Tl = mg
T=mg2l=1.5×10−22×30×10−2=1.560T = {{mg} \over {2l}} = {{1.5 \times {{10}^{ - 2}}} \over {2 \times 30 \times {{10}^{ - 2}}}} = {{1.5} \over {60}}
=0.025 N/m=0.025Nm= 0.025\,N/m = 0.025Nm

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