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Q.

A wire ring of diameter 14 cm is gently lowered on to a liquid surface and then pulled up. When the film just breaks, the force required is 0.0616 N. The surface tension of the liquid is

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a

70 N m-1

b

7 Nm-1

c

70 dyne cm-1

d

None of these

answer is C.

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Detailed Solution

2×2πr×σ = 0.0616×105(in CGS)or σ = 61602×2×(227)×7dyne cm-1       = 70 dyne cm-1
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A wire ring of diameter 14 cm is gently lowered on to a liquid surface and then pulled up. When the film just breaks, the force required is 0.0616 N. The surface tension of the liquid is