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

  $\frac{{\mathrm{\pi R}}^2}{\mathrm{T}}$

• B

  ${\mathrm{\pi R}}^2\mathrm{T}$

• C

  $2\mathrm{\pi RT}$

• D

  $2\mathrm{RT}$