Electromagnetic radiation | physics | britannica., General considerations occurrence and importance. close to 0.01 percent of the mass/energy of the entire universe occurs in the form of electromagnetic radiation. all human life is immersed in it, and modern communications technology and medical services are particularly dependent on one or another of its forms..
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Magnetism questions – answers, Magnetism is simply an abstraction that people use for the changes in electromagnetic force created by the motion of electric charges. there are different types of magnetism that include electromagnetism, ferromagnetism, paramagnetism, and diamagnetism..
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