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1. There is a horizontal film of soap solution. On it a thread is placed in the form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R. If the surface tension of the loop be T, then what will be the tension in the thread

(a)   πR2/T

(b)   πR2T

(c)   2πRT

(d)   2RT

Ans. d

(21)

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