can we find the quantity of the charge of a magnet?

Yes, the quantity of the charge of a magnet is measured in units called magnetic moments. The magnetic moment of a magnet is a measure of its strength and can be calculated by multiplying the strength of the magnetic field by the area of the loop forming the magnet. This quantity is typically measured in units of ampere meters squared (A.m^2) or joules per tesla (J/T).