The second Maxwell equation, which Faraday describes, is even simpler than the first. Since there are no free carriers of magnetic charges, therefore, there is no magnetic current, there is only a magnetic displacement In, causing magnetic polarization of the medium, for example, the magnetization of iron. The change in this displacement per unit of time plays the role of a magnetic current. Faraday got it by bringing a magnet closer to a coil of wire. And there was an electric current in the wire. But it was the result of something more important. This something is the electric field created by the movement of the magnet. It moves electric charges in a wire or in some body or medium, no matter what. Even in a vacuum, an electric field is generated, although no conduction current is generated. In a conductive medium, it creates circular currents, i.e., according to Faraday, it is rotating. Let's denote it with the letter E. And then, in differential form, we get the surprisingly simple second Maxwell equation in which the minus sign means that in the induction phenomenon, the rotation of the electric field with increasing B occurs in the opposite direction compared to the rotation of the magnetic field with increasing D in the Oersted phenomenon for the displacement current.
These two equations describe all macroscopic phenomena of electrodynamics. Confirming the known and predicting the unknown, they are so striking in their simplicity that the surprised Boltzmann excitedly exclaimed: "Wasn't it God who wrote these signs?" The electric displacement D is greater the stronger the electric field E, which moves charges in the medium. To a first approximation, D and E are mutually proportional.
Each time change in the electric field vector E leads to the appearance of a circular magnetic field H. But the appearance of a vortex H leads to a time change in the vector E. As a result of a change in the vector H, a vortex vector E arises, etc. Consequently, electric and magnetic fields are so interconnected that it is enough for one of them to arise or disappear, or change its intensity, as another field associated with it will immediately arise; then again the first and again the other, so that any weak, The electric or magnetic excitation of an electromagnetic wave will travel through the entire space to infinity. Maxwell combined these two equations into one and obtained the equation of a wave propagating in an elastic medium, which he had already known before. Le code promo 1xbet est votre sésame pour un bonus de bienvenue impressionnant. Activez-le et obtenez un bonus de 100% sur votre premier dépôt, pour un maximum de 15000 XOF. Ce boost financier vous permet de parier sur vos sports favoris comme le football ou le basketball, ou de découvrir les tournois de poker et les jeux en direct sans pression. Profitez de cette offre pour tester des stratégies et augmenter votre bankroll initiale.