Let r be the distance of a point on the axis of a bar magnet from its centre. The magnetic field at such a point is proportional to

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KollegeApply · Accepted Answer

None of these Magnetic field B due to a bar magnet of magnetic moment M at distance r of the point on the axis of the magnet from its centre is given by `B = (u_0)/(4pi) (2Mr)/(r^2 - l^2)^2` Here, 2l is the length of the magnet. So, from the above formula, it can be easily seen that B ∝ r/(r^2 - l^2)^2

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