schematics

lines of force of equipotential surfaces (1865) by james clerk maxwell

the method of drawing lines of force so that the charge of any center is indicated by the number of lines which converge to it, and the induction through any surface cut off in the way described is measured by the number of lines of force which pass through it. the dotted straight lines on the left hand side of Fig. 6 represent the lines of force due to each of two electrified points whose charges are 10 and —10 respectively.

artist • philomath • developer • optimist • 
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an equipotential or isopotential refers to a region in space where every point is at the same potential. an equipotential of a scalar potential function in n-dimensional space is typically an (n − 1)-dimensional space.