A charge +q₁ is brought to a point a distance r₁ from a charge +q. Then +q₁ is removed and a charge +4q₁ is brought to a point a distance 2r₁ from +q. If the electrostatic potential at r₁ is V, the electrostatic potential at 2r₁ is

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The electrostatic potential V due to a charge is given by V = kq/r, where k is Coulomb's constant, q is the charge, and r is the distance from the charge. When the charge is +4q and the distance is doubled to 2r, the new potential becomes V' = k(4q)/(2r) = 2kq/(2r) = kq/r, which is V/2.

A Charge +Q1 Is Brought to a Point a Distance

A Charge +Q₁ Is Brought to a Point a Distance