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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.


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

Physics

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