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Q.

A wire of mass 1 g is kept horizontally on the surface of water. The length of the wire that does not break the surface film is (surface tension of water is 70 dyne cm-1)

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a

3 cm

b

4 cm

c

7 cm

d

14 cm

answer is C.

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Detailed Solution

2lσ = 1× 980 or l = 9802×70cm = 7 cm
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