The definition of a magnetic field is a place in space near a magnet or an electric current where a physical field is created from a moving electric charge that creates force on another moving electric charge.
An example of a magnetic field is the Earth's magnetic field.
a physical field that arises from an electric charge in motion, producing a force on a moving electric charge
A condition found in the region around a magnet or an electric current, characterized by the existence of a detectable magnetic force at every point in the region and by the existence of magnetic poles.
iron filings show the magnetic field surrounding opposite poles