What is the net electric charge on the charged capacitor?

The net electric charge on a charged capacitor is always zero.

A capacitor consists of two conductive plates separated by an insulating material (dielectric). When a voltage is applied across the plates, it creates an electric field between them. This electric field causes electrons to accumulate on one plate (the negative plate) and be depleted from the other plate (the positive plate).

The accumulation of electrons on one plate and the depletion of electrons on the other plate result in an equal and opposite charge on the plates, which cancels out to give a net charge of zero. In other words, the positive charge on one plate is equal in magnitude to the negative charge on the other plate, and the system as a whole is electrically neutral.

Mathematically, if Q+ represents the positive charge on one plate and Q- represents the negative charge on the other plate, then:

Q+ = -Q-

The sum of these charges is:

Q_total = Q+ + Q- = 0

So, the net electric charge on the charged capacitor is always zero. The energy stored in the electric field between the plates is a function of the voltage across the capacitor and the capacitance, but it does not depend on the net charge.