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

(a)0.250 Nm-1

(b) 0.125 Nm-1

(c)0.2Nm-1

(d) 8.0 Nm-1

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