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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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Bizarre gravitational energy equation
In "Electricity and magnetism" by Benjamin Crowell page 39 there is this:
Recall that the gravitational energy of two gravitationally
interacting spheres is given by $PE = -Gm_1m_2/r$ where $r$ …