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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a