The effect of the earth’s magnetic field is neglected *
A dot appears like the tip of an arrow pointed at you, a cross is like the feathered
tail of an arrow moving away from you Hans Christian Oersted
(1777–1851) 
Danish
physicist and chemist,
professor at Copenhagen He 
observed 
that 
compass needle suffers aa
deflection when placed
near a wire carrying an
electric 
current