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
Surface tension force = Weight of wire∴2l×0.8=10×10−3×10⇒l=6.25cm