Voltage due to a point charge

Since the potential energy of one charge due to another charge is:

PEel = k q1 q2 / r12

and since voltage is defined to be:

Vat 2 = PEof 2 / q2

we can find a nice formula for the voltage in space due to a single charge:

Vat 2 due to 1 = k q1 / r12 .

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