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A bar magnet is 0.10 m long and its pole...

A bar magnet is `0.10` m long and its pole strength is 120 Am . Find magnitude of magnetic field at a point on its axis at a distance 20 cm from it .

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`B _("axial" ) = (mu _(0))/(4pi)(2M xx r )/((r ^(2) - l ^(2))^(2))= (10 ^(-7) xx 2 xx (120xx 0.1)xx 0.2)/([ (0.2)^(2) - (0.05)^(2) ]^(2))= 3.4 xx 10 ^(-5) T`
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