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Q.

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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a

1.65×10−2

b

3.33×10−2

c

6.66×10−2

d

8.25×10−2

answer is B.

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Detailed Solution

W=2×T×A2−A12×10−4=2×T×30×10−4⇒T=3.33×10−2Nm−1
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