Question

Suppose tension in thread is ( F )
then for small part ( Delta l ) of thread
[
Delta l=R theta text { and }
]
( 2 F sin theta / 2=2 T Delta l=2 T R theta )
( Rightarrow F=frac{T R theta}{sin theta / 2}=frac{T R theta}{theta / 2}=2 T R )

# W 1.7 XIV Joule 111. (a) 7.22X10 June (c) 2.88 x 10 Joule (d) 5.76 x 10- Joule 106. There is a horizontal film of soap solution. On it a thread Vis 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) TR?IT ( 027RT (d) 2RT 107 A larme number of water drons each of radius r combine (b) TRT

Solution