A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents,[1]: ch1 [2] and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.
Properties of Magnetic Field Lines
Magnetic field lines never cross each other
The density of the field lines indicates the strength of the field
Magnetic field lines always make closed loops
Magnetic field lines always emerge or start from the north pole and terminate at the south pole.
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