Please explain Electromagnetic induction.
Answers
Electromagnetic Induction or Induction is a process in which a conductor is put in a particular position and magnetic field keeps varying or magnetic field is stationary and a conductor is moving. This produces a Voltage or EMF (Electromotive Force) across the electrical conductor.
Please explain Electromagnetic induction
Electromagnetic Induction was discovered by Michael Faraday in 1831 and James Clerk Maxwell mathematically described it as Faraday’s law of induction.
Electromagnetic Induction is a current produced because of voltage production (electromotive force) due to a changing magnetic field.
This either happens when a conductor is placed in a moving magnetic field (when using AC power source) or when a conductor is constantly moving in a stationary magnetic field.
Michael Faraday 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 measures the voltage in the circuit.
Electromagnetic Induction
Through his experiment, he discovered that there are certain factors that influence this voltage production. They are:
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
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.
You may also want to check out these concept related to induction:
Induction – Self Induction and Mutual Induction
Electromagnetism
Magnetic Induction Formula
Applications of Electromagnetic Induction
Based on his experiments we now have Faraday’s law according to which the amount of voltage induced in a coil is proportional to the number of turns of the coil and the rate of changing magnetic field.
AC generator works on the principle of electromagnetic induction.
The working of electrical transformers are based on the electromagnetic induction.
The magnetic flow meter is based on the electromagnetic induction.
Electromagnetic Induction Formula
Mathematically, the induced voltage can be given by the following relation:
e = N × dΦ / dt
Where,
e is the induced voltage (in volts)
N is the number of turns in the coil
Φ is the magnetic flux – the amount of magnetic field at a surface (in Webbers)
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. Everyday machines like motors, generators and transformers work on the principle of electromagnetic induction.