Here's why:

* Newton's Third Law: For every action, there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B exerts an equal and opposite force on object A.

* Electrostatic Force: This force arises from the interaction of charged particles. It's attractive between opposite charges and repulsive between like charges.

* The Principle in Action: When two charged objects interact:

* Object 1 exerts an electrostatic force on object 2, pushing or pulling it.

* Simultaneously, object 2 exerts an equal and opposite force on object 1. These forces act along the line connecting the centers of the charges.

Important Note: While the magnitudes of the forces are equal, the effects on the objects may differ. This depends on the masses of the objects. A lighter object will experience a greater acceleration due to the same force.

Example: Imagine two charged spheres. If one sphere is negatively charged and the other positively charged, they will attract each other. The negatively charged sphere exerts a force on the positively charged sphere, pulling it towards itself. At the same time, the positively charged sphere exerts an equal and opposite force on the negatively charged sphere, pulling it towards itself.