In 1st experiment using Coulomb's law we have seen force due to point charges on other. In this experiment we will estimate electric fields due to various charge distributions.
Electric field is defined as the electric force per unit charge. The direction of the field is taken to be the direction of the force it would exert on a positive test charge. The electric field is radially outward from a positive charge and radially in toward a negative point charge.
where, F is the electric force experienced by the particle q is its charge E is the electric field wherein the particle is located.
In the above figure qt is the unit test charge to evaluate the Electric Field.
Fe is the force on qt due to the charge at centre.
The following video may help you to better understand the basic concepts of Electrostatic Field