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Find the flux density at a distance of 20 cm from a north pole of strength 550 amp-meters in a medium with relative permeability 50

Find the flux density at a distance of 20 cm from a north pole of strength 550 amp-meters in a medium with relative permeability 50 . Also find the force on another north pole of equal strength at this distance. Assume that the south poles are at a large distance.

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