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Q. Direction of magnetic field at equatorial point is

MHT CETMHT CET 2005Magnetism and Matter

Solution:

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
Hence, in equatorial position, the direction of magnetic field is parallel to magnetic axis direction from north pole to south pole ie, parallel to M.