Electromagnetic Induction

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Sonali Purohit
Gateways
3/13/19
Electromagnetic Induction
Michael Faraday, a British scientist and inventor, is credited with heavily contributing on the discovery and study of electromagnetism and electrochemistry. He is also noted the homopolar generator, electrolysis and the bicycle dynamo. However, he is hardly ever acknowledged for his discovery of electromagnetic induction 1831. The formal name for the physics equation that defines the behavior of an induced electromagnetic field from the magnetic flux (change in a magnetic field) is Faraday's law of electromagnetic induction. The more generalized equation is one of Maxwell's equations, called the Maxwell-Faraday equation, which defines the relationship between changes in electrical fields and magnetic fields. This widely used equation looks like…(see picture below)



To reiterate what was said before, in 1831, Michael Faraday carried out numerous experiments in his attempt to prove that electricity could be generated from magnetism. Within the course of a few weeks, the great experimentalist not only had clearly demonstrated this phenomenon, now known as electromagnetic induction, but also had developed a good conception of the processes involved. One of the experiments performed by Faraday in that important year featured a permanent magnet and a galvanometer connected to a coil of wire wound around a paper cylinder.


Electromagnetic induction (or sometimes just induction) is a process in which a conductor is placed in a changing magnetic field (or a conductor moving through a stationary magnetic field). This results in the production of a voltage across the conductor. This process of electromagnetic induction, in turn, causes an electrical current.  The process of electromagnetic induction works in reverse as well, so that a moving electrical charge generates a magnetic field. In fact, a traditional magnet is the result of the individual motion of the electrons within the individual atoms of the magnet, aligned so that the generated magnetic field is in a uniform direction. In non-magnetic materials, the electrons move in such a way that the individual magnetic fields point in different directions, so they cancel each other out and the net magnetic field generated is negligible.

As some uses for electromagnetic induction include washing machines, guitar pickups, welding and many more, the possibilities for the possible future uses are infinite. But perhaps the most amazing one can be to advance to technology of transportation. Most specifically, trains. Electromagnetic induction is already utilized by various train stations, therefore it would not be hard to figure out how to implement it in trains. However, the evolution of trains could be developed greatly in ways that are unimaginable now. For example, the bullet trains in Japan have technology that is far beyond our reach. Some improved electromagnetic tech could be the thing we needed in order to get farther in our inventions.


https://www.techopedia.com/definition/19997/electromagnetic-induction



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