User:K.r.sasikumar/Sandbox

ELECTROMAGNETIC INDUCTION Electricity and magnetism were considered as separate and unrelated phenomena for the nineteenth century,experiments on electric current by oersted,ampere and few others established the fact that electricity and magnetism are interrelated. they found that moving electric charges produce magnetic fields.for example,an electric current deflects a magnetic compass needle placed in its vicinity. this naturally raises the question like-is the converse effect possible?can moving magnets produce electric currents?does the nature permit such a relation between electricity and magnetism?the answer is "yes" The experiments OF Michael Faraday in England and Joseph henry in USA, conducted around 1830,demonstrated conclusively that electric currents were induced in closed coils when subjected to changing magnetic fields. in this phase,we shall study the phenomena associated with changing magnetic fields and understand the underlying principles. The phenomenon in which an emf is generated when there is change in magnetic flux associated with a closed loop or when a moving conductor cuts the magnetic flux lines is called electromagnetic induction. the phenomenon in which electric current is produced by varying magnetic fields is called electro magnetic induction.