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A very light, rectangular wire-frame of ...

A very light, rectangular wire-frame of dimensions `7 cm xx 5 cm` hangs just above the free surface of a liquid of surface tension T, with its plane parallel to the free surface. The wire -frame is just brought in contact with the liquid surface and then, lifted up. If the force required to lift the wire-frame is 3.36 N, then what is the value of T in `(N m^(-1))`?

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