Electromagnetic Wave

There are two basic laws which connects the electrical and magnetic phenomena:
First, electric currents can be produced (induced) magnetic field. This phenomenon is known as magnetic induction. The foundation stone of this concept is that Oersted had discovered this phenomenon experimentally and completely formulated by Ampere. Symptoms of magnetic induction is known as Ampere's Law.
Second, the magnetic field varies with time can generate (induce) electric fields in the form of electrical current. This phenomenon is known as electromagnetic induction phenomenon. The concept of electromagnetic induction discovered by Michael Faraday experimentally and formulated in full by Joseph Henry. Electromagnetic induction law itself became known as the Faraday-Henry's Law ..

From these two basic principles of electrical magnets above and taking into account the prevailing concept of symmetry in the laws of nature, James Clerk Maxwell submitted a proposal. Maxwell put forward the proposal, namely that if the magnetic field varies with time can produce an electric field then it might otherwise occur. Thus Maxwell suggested that the electric field varies with time can produce (induced) magnetic field. Maxwell's proposal was later to become the third law that links between electricity and magnetism.
So the third principle is the electric field changing with time can produce a magnetic field. This third principle proposed by Maxwell is a development of the formulation of Ampere's law. Therefore, this principle is known as Ampere-Maxwell Law.
Of the three basic principles of electricity and magnetism at the top, Maxwell saw the existence of a basic pattern. The magnetic field can generate time-varying electric fields that also vary with time, and the electric field varies with time can also generate magnetic fields. If this process is continuous it will produce a magnetic field and electric field are continuous. If the magnetic field and electric field simultaneously propagate (spread) in all directions in space then this is a wave phenomenon. Such waves are called electromagnetic waves because it consists of electric and magnetic fields that propagate in space.