Ø
Ørsted noticed a
compass needle deflected from magnetic north when an electric current from a
battery was switched on and off, confirming a direct relationship between
electricity and magnetism On 21 April 1820.
Ø
According to its
his initial interpretation the magnetic effect create from all the side the
electric wire.
Ø After three years
he published his finding which is show that an electric current produces a
circular magnetic field as it flows through a wire.
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