According to the concept of conservation of charge, no matter what processes take place within an isolated system, the total electric charge stays constant over time. This indicates that charge may only be moved from one area of the system to another; it cannot be created or destroyed.
The net charge before and after a movement of charges within an isolated system (such as electrons traveling through a conductor) stays constant. Even though atoms or molecules may exchange electrons during chemical processes, the system’s total charge stays constant.
If we represent the total charge of an isolated system at time t1 as 𝑄1 and at a later time t2 as 𝑄2, then
Q1 = Q2
In electrostatics, when two charged items come into contact, the charge is transferred between them, but the total charge of the system (the sum of both objects’ charges) remains constant.