One of the concepts of electromagnetism and physics is a generic term for the electrical and magnetic properties of matter. such as electromagnetic induction, electromagnetic waves and so on. The electromagnetic phenomenon was first discovered by Faraday. Electromagnetic phenomena occur because of fluctuations in charge movement. To form a magnetic field, so all electromagnetic phenomena can not be separated from the magnetic field. Electromagnetism is a branch of physics that studies the interaction of electromagnetic and electromagnetic phenomena, their laws and applications. Maxwell's hypothesis of changing the magnetic field generated by electric field has laid the whole theoretical system of electromagnetism, developed electrical and electronic technology which has a great influence on modern civilization, and profoundly influenced people's thought of understanding the material world.