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Why does magnetic field lines form closed loops?

Answer»

Gauss’ law of magnetism states that “ The MAGNETIC flux though any closed surface is ZERO “ .

This is just another way of saying that magnetic mono-poles do not exist, and that all magnetic FIELDS are actually generated by circulating currents.

An immediate corollary of the above law is that the number of magnetic field-lines which enter a closed surface is always EQUAL to the number of field-lines which leave the surface. In other words:

Magnetic field-lines form closed loops which never begin or END.



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