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A massless inextensible string in the fo...

A massless inextensible string in the form of a loop is placed on a horizontal film of soap solution of surface tension T. If film is pierced inside the loop and it convert into a circular loop of diameter d, then the tension produced in string is

A

Td

B

`pi`Td

C

`pid^(2)`T

D

`(pid^(2)T)/4`

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