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Physics

Electromagnetic Induction

Electromagnetic Induction

Michael Faraday in 1832, at the age of 41 discovered that electricity could be produced without any  battery by using magnetic fields. This phenomenon is called “Electromagnetic when the speed of  the relative motion Induction”.

“Electromagnetic induction is thus defined as a process whereby an emf is produced or induced in  a conductor by the relative motion of the conductor and a magnetic field”. Experiments show that:

  1. an emf is induced in the coil whenever there is a relative motion between the coil and the
  2. the magnitude of the induced emf increases when the speed of the relative motion between the magnet and the coil, the strength of the magnet, the number of turns of the coil  all increases.
  3. the induced emf would also increase if there is soft iron core inside the coil.

However, current can also be induced in a straight conductor when a magnetic field is applied  perpendicular to it. The direction of the current is given by FLEMING’S RIGHT HAND RULE, which  state that, ‘’If the first three fingers of the right hand are held at right angle to each other, with the  Forefinger in the direction of the field, and the thumb in the direction of the motion, then the  mIddle finger is in the direction of the induced current’’.

File:Fleming-left-hand-rule.png

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