Two Point Charges of Different Magnitude and Sign

A function to calculate the electric potential energy of two different charges (+2e and -1e):

The electric field of two different charges:

The electric potential of two different charges::
(The contours represent factors of 10 difference in energy.)

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

A 3-D view of the electric potential of two different charges:

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