Page:A Treatise on Electricity and Magnetism - Volume 2.djvu/274

242 founded on the definition of the unit of electricity, Arts. 41, 42, and may be deduced from the equation, Rh which expresses that the resultant force $$\mathfrak{E}$$ at any point, due to the action of a quantity of electricity $$e$$ at a distance $$L$$, is found by dividing $$e$$ by $$L^2$$. Substituting the equations of dimension (1) and (8), we find Rh whencein the electrostatic system.

The electromagnetic system is founded on a precisely similar definition of the unit of strength of a magnetic pole, Art. 374, leading to the equation Rh whence and in the electromagnetic system. From these results we find the dimensions of the other quantities.

626.]