Write an expression of magnitude of magnetic field at point lies on equatorial line of a bar magnet.
Write an expression of magnitude of magnetic field at point lies on equatorial line of a bar magnet.
$\mathrm{B}=-\frac{\mu_{0} m}{4 \pi r^{3}}$
where $\frac{\mu_{0}}{4 \pi}=$ constant
${l}m=\text { magnetic dipole moment }$ $r=\text { perpendicular distance from the mid point of magnet }$
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