(b) By changing the magnitude of the source of magnetic flux. (a) moving the coil or the source of flux relative to each other or This effect was first observed and explained by Ampere and Faraday between 18. If magnetic flux through a coil is altered then an e.m.f. Around 1830 to 1832, Joseph Henry made a similar discovery, but did not publish his findings until later. Michael Faraday is generally credited with the discovery of induction in 1831 though it may have been anticipated by the work of Francesco Zantedeschi in 1829. This process of electromagnetic induction, in turn, causes an electrical current, it is said to induce the current. unit is the weber (Wb).Įlectromagnetic induction (or sometimes just induction) is a process where a conductor placed in a changing magnetic field (or a conductor moving through a stationary magnetic field) causes the production of a voltage across the conductor. Magnetic Flux is defined as the product of the magnetic flux density and the area normal to the field through which the field is passing. Induction can produce electricity (in coils), heat (in ferrous metals), or waves (in a radio transmitter).įinally, it is referring to the phenomenon where an emf is induced when the magnetic flux linking a conductor change. Electromagnetic induction is when an electromagnetic field causes molecules in another object to flow. This process of generating current in a conductor by placing the conductor in a changing magnetic field is called induction.Įlectromagnetic induction is the production of a potential difference (voltage) across a conductor when it is exposed to a varying magnetic field. The magnetic field disappears when the current is turned off. To study the phenomenon of Electromagnetic InductionĪn electromagnet is a type of magnet in which the magnetic field is produced by electric current. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution License. Use the information below to generate a citation. Then you must include on every digital page view the following attribution: If you are redistributing all or part of this book in a digital format, Then you must include on every physical page the following attribution: If you are redistributing all or part of this book in a print format, Want to cite, share, or modify this book? This book uses the The faster the motion, the greater the emf, and there is no emf when the magnet is stationary relative to the coil. The same results are produced if the coil is moved rather than the magnet-it is the relative motion that is important. Emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. An emf is induced when the magnetic field in the coil is changed by pushing a bar magnet into or out of the coil. One of his early experiments is represented in Figure 13.2. The first productive experiments concerning the effects of time-varying magnetic fields were performed by Michael Faraday in 1831. Use Faraday’s law to determine the magnitude of induced emf in a closed loop due to changing magnetic flux through the loop.Determine the magnetic flux through a surface, knowing the strength of the magnetic field, the surface area, and the angle between the normal to the surface and the magnetic field.By the end of this section, you will be able to:
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