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unit north pole??

Prashan_punk
in Physics

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the intensity of magnetic field at a point is defined as the force experienced by a unit north pole placed at that point .

 

WHat does unit north pole mean ???

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thanks guys...but i have trouble understandin the expression for the magnetic field intensity i.e

 

B = F/m

 

where 'B' is magnetic field intensity, F is force experienced by The unit pole and 'm' is the strength of another magnet...

 

just confused how this relation came

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