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Q.

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 40 cm, the surface tension of the film of soap is

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a

25 Nm-1

b

2.5 Nm-1

c

2.5 x 10-2 Nm-1

d

2.5 x 10-3 Nm-1

answer is C.

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