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Question

what special property does the north pole of a magnet possess or why is that the all the magnetic field lines starts or originates from it and ends or goes in to the South Pole.

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Solution

no reason just convention we takes or assumes

Why magnetic lines start from north pole? That is equivalent to asking why electric field lines begin from a positive charge and end into a negative charge?
or why the direction of the current is the direction of flow of positive charges?
Or why protons are positive and electrons are negative ?
Or why A is called A or B is called B? :D

Get it? it is just a convention, there is no reason, we have to chose one direction and then work with it right?
we liked to think of north pole as similar to a positive charge
And so we liked to think of magnetic field lines starting from N and ending towards S

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