What is Electromagnetic Induction?
This phenomenon was discovered by Michael Faraday. He arranged a conducting wire as per the setup given below, attached to a device to measure the voltage across the circuit. When a bar magnet was moved through the coiling, the voltage detector measure a voltage in the circuit.
Through his experiments he discovered that there are certain factors that influence this voltage production. They are
1. Number of Coils: The induced voltage is directly proportional to the number of turns/coils of the wire. Greater the number of turns, greater is voltage produced
2. Changing Magnetic Field: Changing magnetic field affects the induced voltage. This can be done by either moving the magnetic field around the conductor or moving the conductor in the magnetic field.
Importance of Electromagnetic Induction:
Mathematically, the induced voltage can be given by the following relation.
e is the induced voltage (in volts)
N is the number of turns in the coil
Φ is the magnetic flux – amount of magnetic field at a surface (in Webers)
t is the time (in seconds)
The significance of this discovery is a way of producing electrical energy in a circuit by using magnetic fields and not just batteries anymore. Useful everyday machines like motors, generators and transformers work on the principle of electromagnetic induction.
Did you know that the principle of electromagnetic induction is also involved in the working of a credit card strip when you swipe it across the card machine? How do you think this works?
<Hint: The strip is magnetic>
Stay tuned with Byju’s to learn more about Faraday’s law, electromagnetic induction and much more.
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