Explanation

(d) Magnetic field due to a magnet at any point or equatorial line is given by
$B = \frac{\mu_{0}}{4\pi}\frac{M}{d^{3}}$
Direction of B is shown in figure.
[image:5_image51.emf]
Hence, in equatorial position, the direction of magnetic field is parallel to magnetic axis in direction from north pole to south pole ie, anti-parallel to M.