A circular loop of thin wire of radius 5/pi cm is suspended from one arm of a balance. The plane of the loop is in contact with the surface of soap solution. The pull on the loop due to S.T. is found to be 0.8 x 10-3 kg-wt. Calculate the S.T. of a soap solution, assuming its angle of contact to be 0 deg.

A circular loop of thin wire of radius 5/pi cm is suspended from one arm of a balance. The plane of the loop is in contact with the surface of soap solution. The pull on the loop due to S.T. is found to be 0.8 x 10-3 kg-wt. Calculate the S.T. of a soap solution, assuming its angle of contact to be 0 deg.