In a system of charges on the xy plane, zero volts does not indicate a position where a charge will remain stationary. Instead, a charge will not move only where the electric field is zero, as the field represents the force per charge. Voltage reflects electric potential energy per charge, similar to how gravitational potential energy can be defined at any point. Therefore, a charge placed at a point of zero voltage can still move if there is a non-zero electric field present. This illustrates that zero volts does not equate to stability for a charge.
