<P> While preparing for an evening lecture on 21 April 1820 , Hans Christian Ørsted made a surprising observation . As he was setting up his materials , he noticed a compass needle deflected away from magnetic north when the electric current from the battery he was using was switched on and off . This deflection convinced him that magnetic fields radiate from all sides of a wire carrying an electric current , just as light and heat do , and that it confirmed a direct relationship between electricity and magnetism . </P>
<P> While preparing for an evening lecture on 21 April 1820 , Hans Christian Ørsted made a surprising observation . As he was setting up his materials , he noticed a compass needle deflected away from magnetic north when the electric current from the battery he was using was switched on and off . This deflection convinced him that magnetic fields radiate from all sides of a wire carrying an electric current , just as light and heat do , and that it confirmed a direct relationship between electricity and magnetism . </P>
who discovered the link between electricity and magnetism
who discovered the link between electricity and magnetism
Hans Christian Ørsted
Hans Christian Ørsted