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A rectangular film of liquid is extended from $$(4cm\times2cm)$$ to $$(5cm\times4cm)$$. If the work done is $$3\times10^{-4}$$ J, the value of the surface tension of the liquid is
$$0.125 Nm^{-1}$$
$$0.2 Nm^{-1}$$
$$8.0 Nm^{-1}$$
$$0.250 Nm^{-1}$$
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