What is the magnitude of the equational and axial fields due to a bar magnet of length 8.0 cm at a distance of 50 cm from its mid-point ? The magnetic moment of the bar magnet is `0.40 A m^(2)`,

Explanation

From Eq.
`B_(E) = (mu_(0)m)/(4pi r^(3)) = (10^(-7) xx 0.4)/((0.5)^(3)) = (10^(-7) xx 0.4)/(0.125) = 3.2 xx 10^(-7) T`
From Eq., `B_(A) = (mu_(0) 2m)/(4 pi r^(3)) = 6.4 xx 10^(-7) T`.