A rectangular film of liquid is extended from ( 4cm x 2 cm) to (5 cm X 4 cm). If the work done is 3 X 10-4 J, the value of the surface tension of the liquid is :
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A rectangular film of liquid is extended from ( 4cm x 2 cm) to (5 cm X 4 cm). If the work done is 3 X 10-4 J, the value of the surface tension of the liquid is :