A Charge +Q₁ Is Brought to a Point a Distance

Multiple Choice

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

A) V/4.
B) V/2.
C) V.
D) 2V.
E) 4V.