iron filings get attracted towards a bar magnet because of
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because of magnetic force
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Explananside the bar magnet, the B is actually stronger at the centre (like in the case of a solenoid). Outside the bar magnet, B is small near the centre since there are very less open field lines there. A bar magnet can be very well modeled by a current carrying solenoid with very large no. of turnings (current bearing loops) per unit lengthtion:
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