what is the relation between electric field intensity and electric potential?

Q. Define intensity of electric field (E) and the potential differences (V) between two points. Derive the relation between them.

Q. Write down the relation between electric field and potential at a point

Q. Which of the following statement is true about the relation between electric field and potential?

Q. For a metallic conductor, what is the relation between current density $\left(j\right)$, conductivity $\left(\sigma \right)$ and electric field Intensity $E$?