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Consider a U-shaped frame with a sliding...

Consider a U-shaped frame with a sliding wire of length `l` and mass 'm' on its arm. It is dipped in a soap solution, taken out and placed in vertical position as shown in figure. Choose minimum value of m so that does not descent (Surface tension of soap solution is S)

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The correct Answer is:
D
For wire to be in equilibrium,
`mg = 2Sl rArr m = (2Sl)/(g)`
For mass less than `(2Sl)/(g)` it will move upward So amongst the options `(Sl)/(4g)` is the minimum mass.
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