The work done in increasing the size of a rectangular soap film with dimensions 8 cm×3.75 cm to 10 cm×6 cm is 2×10-4 J . The surface tension of the film in Nm-1 is

W=2×T×A2−A1 2×10−4=2×T×30×10−4 ⇒T=3.33×10−2Nm−1

The work done in increasing the size of a rectangular soap film with dimensions 8 cm×3.75 cm to 10 cm×6 cm is 2×10-4 J . The surface tension of the film in Nm-1 is

W=2×T×A2−A1 2×10−4=2×T×30×10−4 ⇒T=3.33×10−2Nm−1

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The work done in increasing the size of a rectangular soap film with dimensions 8 cm $\times$ 3.75 cm to 10 cm $\times$ 6 cm is 2 $\times$ 10^-4 J . The surface tension of the film in Nm^-1 is

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$1 .65 \times 10^{- 2}$

$3 .33 \times 10^{- 2}$

$6 .66 \times 10^{- 2}$

$8 .25 \times 10^{- 2}$

answer is B.

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$W = 2 \times T \times [A_{2} - A_{1}] 2 \times 10^{- 4} = 2 \times T \times 30 \times 10^{- 4} \Rightarrow T = 3 .33 \times 10^{- 2} {Nm}^{- 1}$

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The work done in increasing the size of a rectangular soap film with dimensions 8 cm×3.75 cm to 10 cm×6 cm is 2×10-4 J . The surface tension of the film in Nm-1 is

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The work done in increasing the size of a rectangular soap film with dimensions 8 cm $\times$ 3.75 cm to 10 cm $\times$ 6 cm is 2 $\times$ 10^-4 J . The surface tension of the film in Nm^-1 is