15.5 Electric Field
One charge exerts a force on another charge. This force is present everywhere around the charge, theoretically extending to infinity. However, the strength of the force decreases with distance.
lightbulbAn electric field is the region around a charge where it exerts a force on other charges.
The electric field strength decreases with distance from the charge, following an inverse square law for point charges:
E = k q / r²
The electrostatic force per unit positive charge when brought into the electric field of a source charge is called electric field intensity.