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Identify the correct statement(s)...

Identify the correct statement(s)

A

force required to pull a wire of length 1 from the surface of a liquid of surface tension T is 21T

B

force required to pull a ring of radius r from the surface of a liquid of surface tension T is 4`pi`T

C

force required to pull a square loop of side 1 from the surface of a liquid of surface tension T is 8IT

D

force required to pull a semi circular ring of radius r from the surface of a liquid of surface tension T is 2`pi`rT

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The correct Answer is:
A, B, C
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