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Electrostatics is concerned with the electrical fields and scalar potentials of stationary electrical charges and charge distributions. Use this for questions about electromagnetic situations in which currents and magnetic fields are absent, otherwise use the [electromagnetism] and/or [magnetic-fields] tags.
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Field and equipotential lines of a negative ring around a postive disc
Let's say we've got a nice, negatively charged ring around a positively charged center disc. These objects are both 2D and reside on the same "plane".
From the side, the field and equipotential lines …