Electromagnetism is the branch of physics that deals with the study of electric and magnetic fields and their interactions with charged particles and currents.  It is one of the four fundamental forces of nature and is responsible for the behavior of electromagnetic waves, which include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.  The electric and magnetic fields are intimately related to each other and are described by Maxwell's equations, which provide a unified description of electric and magnetic phenomena.  These equations show that a changing electric field produces a magnetic field, and vice versa.  When these fields oscillate in time, they produce electromagnetic waves that propagate through space at the speed of light.

Electromagnetism has numerous applications in modern technology, including telecommunications, electronics, electric power generation and transmission, and medical imaging, among others.  It is also fundamental to our understanding of the behavior of matter at the atomic and subatomic level and plays a crucial role in modern physics, including the study of quantum mechanics and the theory of relativity.

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