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#magnetism concept

2 public questions tagged with this topic.

Hysteresis, Retentivity, Coercivity and Permanent Magnets

The magnetic field inside a bar magnet is directed from:

**Soft ferromagnetic materials** have low coercivity and retentivity, narrow hysteresis loop, lose magnetism when external field removed, ideal for electromagnets and transformer cores. Energy loss per cycle proportional to loop area, explaining why soft materials minimize loss. Inside a bar magnet, magnetic field lines run from the south pole to the north pole to form closed loops with the external field (north to south), maintaining continuity as there are no magnetic monopoles. Substituting values gives South to north, which matches expected magnitude for this magnetic configuration, confir

Ref: NCERT > Physics Book > Magnetism and Matter > Hysteresis, Retentivity, Coercivity and Permanent Magnets

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Magnetic Field Lines, Bar Magnet and Dipole Moment

If a bar magnet is broken into two pieces, each piece retains both a north and a south pole. This observation supports t

**Bar magnet properties** include dipole moment m = pole strength × separation, unit A·m², field lines emerge from north and enter south outside. Lines never cross, ensuring single valued B at any point, and pattern reflects dipole nature with symmetric loops around magnet. Unlike electric charges, magnetic poles cannot be isolated. Breaking a magnet creates two smaller magnets, each with its own north and south pole, indicating that magnetic monopoles do not exist in nature, a key principle in magnetism. Substituting values gives Magnetic monopoles do not exist, which matches expected magnitu

Ref: NCERT > Physics Book > Magnetism and Matter > Magnetic Field Lines, Bar Magnet and Dipole Moment

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