If the electric field due to a point charge varies as $${r^{ - 2.5}}$$ instead of $${r^{ - 2}},$$ then the Gauss law will still be valid.

The Gauss law can be used to calculate the field distribution around an electric dipole.

If the electric field between two point charges is zero somewhere, then the sign of the two charges is the same.

The work done by the external force in moving a unit positive charge from point $$A$$ at potential $${V_A}$$ to point $$B$$ at potential $${V_B}$$ is $$\left( {{V_B} - {V_A}} \right).$$

$$\left| {{Q_1}} \right| > \left| {{Q_2}} \right|$$

$$\left| {{Q_1}} \right| < \left| {{Q_2}} \right|$$

at a finite distance to the left of $${{Q_1}}$$ the electric field is zero

at a finite distance to the right of $${{Q_2}}$$ the electric field is zero