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A massless inextensible string in the form of a loop is placed on a horizontal film of a 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
$T d$
$π T d$
$π d^{2} T$
$\frac{π d^{2} T}{4}$

A

π d^{2} T

B

π T d

C

\frac{π d^{2} T}{4}

D

T d

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