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A wire ring of diameter 14cm is gently l...

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

A

70N `m^(-1)`

B

`7N m^(-1)`

C

70 dyne `cm^(-1)`

D

7 dyne `cm^(-1)`

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The correct Answer is:
C
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TARGET PUBLICATION-SURFACE TENSION -CRITICAL THINKING
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