Question

Write a relation between electric field and potential difference between two points in a field

Answer 1

electrostatics - Relation between Electric field and potential ... Hence electric field is the negative gradient of the scalar potential. The negative sign came as a result because the potential difference is the work done per unit charge against the electrostatic force to move a charge from a to b. However, this equation is valid only for static electrostatic fields.

Answer 2

The relation between electric field and potential difference between two points in a field is
E = -dV/dr