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What is the surface tension of the soap film formed when a U-shaped wire is dipped in a soap solution and removed, and a thin soap film between the wire and the light slider supports a weight of 1.5 × 10 ⁻² N (including the small weight of the slider), with the length of the slider being 30 cm?

Options

  1. A1.0 × 10 ⁻² N/m
  2. B2.5 × 10 ⁻² N/m
  3. C5.0 × 10 ⁻² N/m
  4. D7.5 × 10 ⁻² N/m

Correct answer

B. 2.5 × 10 ⁻² N/m

Step-by-step solution

Correct Option is : (B) 2.5 × 10 ⁻² N/m

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