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Torsional Pendulum Experiment Part B contains How to experimentally determine the Time Period and d1 & d2 distance. d1 is the distance between the center of mass and the wire when the masses are kept closest distance. d2 is the distance between center of mass and the wire when the masses are farthest distance.

Torsional Pendulum Experiment is done in three parts. part t helps the students to know how to determine the radius of wire part B and Part C helps to determine Rigidity modulus of the wire