Two Point Charges of Opposite Sign ("Dipole")

A function to calculate the electric potential energy of a dipole:

The electric field of a dipole:

The electric potential of a dipole:
(The contours represent factors of 10 difference in energy.)

Both the electric field and electric potential of dipole on the same plot:
(Note how the field is always perpendicular to the equipotential lines.)

A 3-D view of the electric potential of a dipole:

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