Page:A Treatise on Electricity and Magnetism - Volume 2.djvu/140

108 To find the value of $$L$$ we have the equations of moments Rh and the geometrical equation Rh whence we obtain, Rh

If $$m$$ is the mass of the suspended apparatus, and $$g$$ the intensity of gravity, Rh

If we also write Rh we find Rh

The value of $$L$$ is therefore a maximum with respect to $$n$$ when $$n$$