Gauss’s law for magnetism states that there the total magnetic flux through a closed surface is always zero. Mathematically, . This is the same as saying that monopoles do not exist.
The magnetic field lines due to a bar magnetic have the following four properties:
(i) The magnetic field lines due to a bar magnet form continuous closed loops.
(ii) The magnetic field lines due to a bar magnet never intersect each other.
(iii) The tangent to the field line at a given point gives the direction of magnetic field at that point.
(iv) The number of field lines crossing per unit area is proportional to the magnitude of the magnetic field.
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