A permanent magnet is always magnetic. It has an invisible magnetic field. Only certain materials, such as iron, feel a magnetic force. Permanent magnets can come in lots of different shapes and sizes ...
Bigger magnets aren't always "stronger". But how do you make a comparison between different magnets? One way is to determine the magnetic dipole moment of the magnet. Maybe you aren't quite sure about ...
THE standard instrument for declination measurements at the Magnetic Observatory, Hermanus, is an Askania standard magnetometer-theodolite of the Schmidt type. The two declination magnets supplied ...
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