Faraday’s Laws of Electromagnetic Induction
Faraday's law of electromagnetic induction describes the linking between an electrical circuit and a magnetic field. It is explained by Michael Faraday to the scientist community. Most electric motors, generators, transformers etc. are working on the principle of electromagnetic induction.
Faraday's First Law
Whenever a conductor is placed in a varying magnetic field, then the EMF gets induced across the conductor which is called the induced emf, and if the circuit is closed then the current will flows through the circuit.
Magnetic field can be varied in different ways –
1. By taking a magnet near or away from the coil.
2. By taking the coil in or out of the magnetic field.
3. By varying the area of a coil placed in the magnetic field.
4. By revolving the coil relative to the magnet.
Faraday's Second Law
The second law of Faraday's electromagnetic induction states that the magnitude of the induced emf is equal to the rate of change of the flux linkage with the coil. The flux linkage is the product of the number of turns and the flux linked with the coil.
According to Faraday's electromagnetic induction law, the rate of change of flux linkage is equal to induced emf.
E= -N (d∅)/dt
Induced EMF can be increased by-
- Increase the number of turns in the coil.
- Increase magnetic field strength to increase flux ф.
- increase the speed of the motion between the coil and the magnet.
