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Q.

A film of liquid is formed between two thin wires A and B each of mass 10 gm and length l. Now wire A is held horizontally and wire B is suspended by the liquid film. If surface tension of the liquid is 0.8 N/m, find the length l.

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a

24.50 cm

b

32.25 cm

c

6.25 cm

d

50 cm

answer is C.

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Detailed Solution

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Surface tension force = Weight of wire

2l×0.8=10×103×10l=6.25cm

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A film of liquid is formed between two thin wires A and B each of mass 10 gm and length l. Now wire A is held horizontally and wire B is suspended by the liquid film. If surface tension of the liquid is 0.8 N/m, find the length l.