# How do electric and magnetic fields affect matter?

Like electricity, magnetism causes attraction and repulsion between objects. Although electricity is based on positive and negative charges, magnetic monopoles are not known. Any magnetic particle or object has a north pole and a south pole, and the directions are based on the orientation of the Earth's magnetic field. Both electric and magnetic fields are the result of the attraction and repulsion of electrical charges.

However, a magnetic effect is caused by moving electrical charges, while an electric field is caused by stationary charges. Electricity and magnetism are two aspects of the electromagnetic force. Ampère's law says that when charged particles flow in a conductor, they produce a magnetic field. The intensity of an electrical current flowing in a cable determines the intensity of this field near the cable.

On the other hand, an electric field in the space around a given charge is given by Coulomb's law. Determine the force exerted on a second nearby charged particle. Their relationship can be clearly explained with the help of Maxwell's equations, a set of partial differential equations that relate electric and magnetic fields to their sources, current density and charge density. The analysis of several of these sandwiches helps to answer technical questions related to the control of the magnetism of thin ferromagnetic films, as they could be used in memory and logic devices.

However, setting the test charge (+) in motion with a speed equal to the electrons (-) will make the charge density (+) of the cable appear to be contracted relative to the charge density (-). This, and whether the charge generated by the field is stationary or moving, are the only differences. The study shows how the electric field, and not the change in the density of electrons in the film (called doping), leads to the control of magnetism in current experiments. Magnets don't attract all metals, but iron, nickel, cobalt, and steel are the most common examples of metals that are attracted to magnets.

An object with a higher charge will have a stronger field, and the field will get stronger as you get closer to the object. The study is called Anisotropy in Rashba's rotating orbit and control of the electric field of magnetism. The co-authors are Jun'ichi Ieda and Sadamichi Maekawa, from the Center for Advanced Scientific Research of the Japan Atomic Energy Agency, in Tokai, and CREST, of the Japan Science and Technology Agency, Sanbancho, in Tokyo. This property of magnetic materials, in which the magnetization is oriented in a preferred direction, is called anisotropy.

This charge density imbalance will now have an associated electric field E that will repel the test charge (+). Adding more coils or increasing the amount of electricity flowing through the coil will make the magnetic field stronger. For observers of this system in the cable frame, the culomb force in the frame of the test load (+) will appear as the magnetic force. A larger magnet has a stronger magnetic field than a smaller magnet when the two magnets are made of the same material.

The researcher and his collaborators from the University of Miami (UM) did not discover the electrical control of magnetism, but rather a new understanding of the phenomenon.