In fact, electrostatic charging was the first type of electricity that was discovered by humans, we can read on how Greek philosophers studied charging particles of different materials. In spite of this electrostatic charging continues to be involved in mysticism and many phenomena are badly understood. It is common that if something inexplicable happens, it is blamed on electrostatic charging. Electrostatic charging can ignite explosions and fires, leads to increased cohesiveness of powders, the particles adhere themselves to the surfaces and can lead to undesirable effects. At the same time, electrostatic charging of powder can also be useful; examples are modern copy machines, electrostatic powder painting and ordinary spray-painting.

Since electrostatic charging is not much understood, there is a need of much research in this field, and many have a need for getting their critical problems related to this phenomenon solved.

Investigation into the magnetic properties of particulate solids is also ongoing. It is known that, depending on their mineralogical composition, particulate solids exhibit magnetic properties. Such properties vary significantly from one kind of material to another, and are commonly classified as diamagnetic, paramagnetic and ferromagnetic material.

Ferromagnetic materials are further classified into soft and hard magnetic materials. Hard magnetic materials are used as permanent magnets, which have large coercive force. Typical hard magnetic materials are for example artificial alloys, ferrites, etc. On the other hand, properties of soft magnetic materials are high permeability, low coercive force, and high saturation magnetization. Typical soft magnetic materials are for example Barium Ferrite, Cobalt Magnet.