Electromagnetism

Electromagnetism

An electromagnet can be defined as a soft-iron core that is magnetised temporarily by passing a current through a coil of wire wound on the core.

Michael Faraday

(1791-1867)

Michael Faraday British physicist and chemist, best known for his discoveries of electromagnetic induction and of the laws of electrolysis. His biggest breakthrough in electricity was his invention of the electric motor.

• Michael Faraday the English scientist was the first person to prove that a magnet can create a current
  
  
• To test this he moved a magnet towards and away from the coil of wire connected to a galvanometer
  
  
• He observed that there was a deflection in the galvanometer indicating that a current is induced in it

• The current obtained due to the relative motion between the coil and the magnet is called induced current
  
  
• The phenomenon by which an emf or current is induced in a conductor due to change in the magnetic field near the conductor is known as electromagnetic induction
  
  
• Faraday arrived at a few conclusions by moving a bar magnet in and out of the coil of wire
  
  
• Some of the experiments performed by Faraday and his observations are tabulated here. Go through them