A wire ring of diameter 14 cm is gently lowered on to a liquid surface and then pulled up. When the film just breaks, the force required is 0.0616 N. The surface tension of the liquid is
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A wire ring of diameter 14 cm is gently lowered on to a liquid surface and then pulled up. When the film just breaks, the force required is 0.0616 N. The surface tension of the liquid is