First slide

Surface tension

Question

The amount of work done in increasing the size of a soap film 10 x 6 cm to 10 x 10 cm is : (S.T. = 30 x 10^-3 N/m)

Easy

A

$2.4 x 10^{- 2} J$
B

$1.2 x 10^{- 2} J$
C

$2.4 X 10^{- 4} J$
D

$1.2 X 10^{- 4} J$

Solution

$W = T \times 2 ∆ A = 30 \times 10^{- 3} \times 2 (10 \times 10 - 10 \times 6) \times 10^{- 4} = 2.4 \times 10^{- 4} J$

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