Write the relation between the electric field of an electric charge and electrostatic potential at any point.

(N/A) The electric field $\vec{E}$ at any point is related to the electrostatic potential $V$ at that point by the negative gradient of the potential.
Mathematically,this is expressed as: $\vec{E} = -\nabla V$.
In Cartesian coordinates,this can be written as: $\vec{E} = -\left( \frac{\partial V}{\partial x} \hat{i} + \frac{\partial V}{\partial y} \hat{j} + \frac{\partial V}{\partial z} \hat{k} \right)$.
This relation signifies that the electric field points in the direction of the steepest decrease of the electrostatic potential.