I came to find out through books and actual experiment that the torsional constant of a wire in a torsional pendulum is directly inverse to its length I find the torsional constant using the rotational version of hooke's law, t=k*theta. I have always thought that a greater length should give a greater torque (thus a higher torsional constant) because it has a higher momentum. I tried to search for more specific explainations as to why it is a inverse relation on the internet, but without much help. The books I got in the libraries are either too simple or too advaned for me. Any explainations would be greatly appreciated. Thx!