If work done in increasing the size of a soap film from 10 cm ×6 cm to 10 cm×11 cm is 2×10-4 J then the surface tension is

(a) 2×10-2 Nm-1              (b) 2×10-4 Nm-1

(c) 2×10-6 Nm-1              (d) 2×10-8 Nm-1

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