Faraday's law of electromagnetic induction

Abstract: Faraday's law of electromagnetic induction information is provided to you by excellent flowmeter and flowmeter manufacturers. Faraday's law of electromagnetic induction formula: e=△/△t; there is also a method for finding electromotive force: e=blv, which is a special derivation of the above definition formula. When this formula is applied, the magnetic flux in the closed coil changes is the cutting motion of the conductor bar , is Faraday electromagnetic induction. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of Faraday's law of electromagnetic induction. Faraday's law of electromagnetic induction formula: e=△Φ/△t; There is also a method for finding electromotive force: e=blv, which is a special derivation of the above-mentioned definition formula. When this formula is applied, the change of the magnetic flux in the closed coil is the cutting motion of the conductor rod, which is the inference of Faraday’s law of electromagnetic induction. What is the law of electromagnetic induction? The law of electromagnetic induction is also called Faraday's law of electromagnetic induction. The phenomenon of electromagnetic induction refers to the phenomenon of induced electromotive force due to changes in magnetic flux. A current will be generated, the generated current is called induced current, and the generated electromotive force (voltage) is called induced electromotive force. The direction of the electromotive force in the law of electromagnetic induction can be determined by Lenz's law or the right-hand rule. The content of the right-hand rule: extend the right hand so that the thumb is perpendicular to the four fingers, the palm is facing the N pole of the magnetic field, the direction of the thumb is the same as the direction of the conductor movement, and the direction pointed by the four fingers is the direction of the induced current in the conductor (induced electromotive force). direction is the same as the direction of the induced current). Lenz's law states that the magnetic field of the induced current should hinder the change of the original magnetic flux. In short, as the magnetic flux increases, the generated current tends to decrease; while the magnetic flux decreases, the generated current tends to increase. Who discovered the law of electromagnetic induction Faraday discovered the law of electromagnetic induction. In the teaching of middle school physics for nearly 30 years, the textbooks used have also written that Faraday discovered the law of electromagnetic induction. On the other hand, it is written on page 15 of the third edition of the standard experimental textbook for ordinary high school curriculum in April 2010 that Newman (F.E.Neumann, 1798—1895), Weber (W.E.Weber, 1804)——1891) After a rigorous analysis of theoretical and experimental data, he pointed out in 1845 and 1846 that the magnitude of the induced electromotive force in a closed circuit is proportional to the rate of change of the magnetic flux passing through the circuit, which later generations called Faraday. The law of electromagnetic induction. That is to say, the author of the textbooks used in the teaching of physics in middle school, university and middle school is wrong about the discoverer of the law of electromagnetic induction. So, who discovered the law of electromagnetic induction? To answer this question clearly, it is necessary to understand Faraday (Michael Faraday, 1791).——1867), Lenz (Heinrich Friedrich Emil Lenz 1804——1865) Newman, Weber's contribution to electromagnetic induction. The development history of the law of electromagnetic induction 1. Overview Faraday's law was originally an experimental law based on observation. Later formalized, the restricted version of its partial derivatives, along with the other laws of electromagnetism, is listed as the modern Heaviside version of Maxwell's equations. Faraday's law of electromagnetic induction is based on Faraday's experiments in 1831. This effect was used by Joseph·Henry discovered it around the same time, but Faraday was published earlier. See Maxwell's original discussion of EMF. In 1834 by the Baltic German scientist Heinrich·Lenz's law, discovered by Lenz, provides the direction of the induced electromotive force and the direction of the current that generates the induced electromotive force. 2. Asking questions After H.C. Oster discovered the magnetic effect of current in 1820, many physicists tried to find its inverse effect, and raised the question of whether magnetism could generate electricity and whether magnetism could act on electricity. 3. Research on Faraday's Law of Electromagnetic Induction In 1822, D.F.J. Arago and A.von Humboldt accidentally discovered that metal had a damping effect on the oscillation of the nearby magnetic needle when measuring the geomagnetic intensity. In 1824, Arago made a copper disk experiment based on this phenomenon, and found that the rotating copper disk would drive the freely hanging magnetic needle above to rotate, but the rotation of the magnetic needle was not synchronized with the copper disk. After a little lag, electromagnetic damping and electromagnetic driving were the first electromagnetic induction phenomena discovered, but they could not be explained at that time because they did not directly manifest as induced currents. 4. Faraday's Law of Electromagnetic Induction was proposed In August 1831, Faraday wound two coils on both sides of the soft iron ring, one of which was a closed loop, a magnetic needle was placed in parallel near the lower end of the wire, and the other was connected to the battery pack and connected to the switch , forming a closed loop with power. The experiment found that when the switch is closed, the magnetic needle is deflected; when the switch is turned off, the magnetic needle is deflected in the opposite direction, which indicates that there is an induced current in the coil without the battery pack. Faraday immediately realized that this was a non-constant transient effect.
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