Magnetism — Important Questions

They form closed loops, They emerge from north pole and enter south pole

Magnetic field lines form continuous closed loops, emerging from the north pole and entering the south pole externally, and continuing inside the magnet from south to north.

Declination

Declination is the angle between the geographic north and magnetic north at a location.

Bismuth

Diamagnetic materials like bismuth have negative susceptibility, meaning they are weakly repelled by magnetic fields.

Ampere/meter

Magnetisation (I) is magnetic moment per unit volume, and its SI unit is Ampere per meter (A/m).