The conductors are enclosed in a lead pipe, 24 in.
Compared with nonmetallic solids, they in general are good conductors of heat and of electricity.
In some cases the value of this electromotive force between two points or conductors is independent of the precise path selected, and it is then called the potential difference (P.D.) of the two points or conductors.
The neutralizing conductors for each disk are placed at right angles to each other.
For since electricity tends to move between points or conductors at different potentials, if the electricity is at rest on them the potential must be everywhere the same.