Derive an expression for magnetic field due to a bar magnet at arbitrary point.
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The magnetic field B1 at P due to N pole of magnet ,
And , the magnetic field B2 at P due to S pole of magnet ,
B=B1−B2 (-ive sign is due to opposite directionS of B1 and B2)
It is clear from eq1 and eq2 that B1>B2 ,therefore the direction of B will be along PX .
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