Equipotential lines and surfaces are a big thing in electrostatics. Graphically, these provide a way of trying to visualize an abstract quantity such as voltage, and mathematically it makes use of a gradient - E-field = dV/dr
The graphing program and site DESMOS has a wonderful visualization and simulator for this. We just wanted to be sure everyone has access to this, and hopefully it will help make sense out of this abstract, mathematical concept.
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