Electromagnetic Induction



You will learn about “Electromagnetic Induction” in this video. Michael Faraday was a scientist who was curious to know whether a magnetic field could produce a current. He set up an experiment in which he took a coil having many turns and connected it to a galvanometer. He then took a magnet and held it next to the coil. The needle of the galvanometer showed no deflection. Now he started moving the magnet close to of the coil. The needle of the galvanometer started deflecting, indicating that current was being induced in the coil. However, when he stopped moving the magnet, the needle also stopped deflecting.

Then, he kept the magnet fixed and moved the coil. He again saw deflection. This made him realize that current was induced in the coil due to relative motion between the magnet and coil. Now, he moved the magnet away from the coil. As a result, the needle of the galvanometer deflected in the opposite direction. This meant the current was now being induced in the opposite direction.

Michael Farday then wanted to see whether speed played a role as well or not. He started moving the magnet faster towards the coil. He saw that faster motion of the magnet led to faster needle deflection. That meant rate at which current was induced was more. He then decided to reverse the poles of the magnet. He noticed that deflection reversed when the poles reversed.

After doing all these experiments, Michael Faraday gave to the world, Faraday’s law of electromagnetic induction. This production of electric current across a conductor when exposed to a changing magnetic field is known as electromagnetic induction.

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