Diagram shows a shaft A B C containing two gears at B and C which is connected to a motor A where the torques of 20 Newton meter and T subscript c is applied on B and C and the distance A B is 1400 millimeter and B C is 1000 millimeter. The x axis is taken along the axis of the gears.

The relationship between internal torque T in a shaft and its angle of twist ϕ is given by:

ϕ=TLJG