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Question

When a 'U' shaped slider of negligible mass is dipped in a soap solution and lifted, a thin film of soap is formed in the frame. It supports a weight of 2.0 x 10$$^{-2}$$ N. If the length of the slider is 40cm, the surface tension of the film of soap is:


A
25 Nm1
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B
2.5 Nm1
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C
2.5 x 102 Nm1
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D
2.5 x 103 Nm1
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Solution

The correct option is C 2.5 x 10$$^{-2}$$ Nm$$^{-1}$$
Given:
Length of the slider $$= 40$$ cm
Weight supports $$=2.0 \times 10^{−2}$$ N
The surface tension here is given as $$\sigma=\displaystyle\frac{F}{2l}=\frac{2\times 10^{-2}}{2\times 0.4}=2.5\times 10^{-2}Nm^{-1}$$

Physics

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