5.12 (a). A short bar magnet has a magnetic moment of . Give the direction and magnitude of the magnetic field produced by the magnet at a distance of 10 cm from the centre of the magnet on the axis,
The magnetic moment of the bar magnet, m = 0.48
Distance from the centre, d = 10 cm = 0.1 m
We know, The magnetic field at distance d, from the centre of the magnet on the axis is:
Therefore, the magnetic field on the axis, B = 0.96 G
Note: The magnetic field is along the S−N direction (like a dipole!).