Final answer:
The electric potential V at a distance r from a point charge is calculated with the formula V = kQ / r, decreasing as the distance increases.
Step-by-step explanation:
The electric potential at a distance r from a point charge can be calculated using the formula V = kQ / r, where V is the electric potential, k is Coulomb's constant (approximately 8.99 x 109 Nm2/C2), Q is the magnitude of the point charge, and r is the distance from the point charge to the point in question. This equation comes from the work needed to move a test charge from a reference point at infinity to a distance r from the point charge, assuming no other forces are present. The electric potential created by a point charge decreases as the distance from the charge increases.