Reading this result: The potential at any point is the superposition of every charge's k·q/r term, so overlapping fields simply add. Field lines run from high potential to low — out of + charges and into − charges — always crossing the equipotentials at right angles.
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How it works
The field is computed by superposition: every point charge contributes a 1/r potential and a 1/r² field, summed across the grid. The heatmap shows potential (red positive, blue negative) and the white curves are field lines traced by integrating along the electric field from each positive charge — the same physics behind capacitor and sensor design.
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