Calculating the magnetic energy stored in a permanent magnet involves integrating the magnetic field strength over the entire volume of the magnet. While practical examples can be complex due to the need for precise measurements of field strength, rough estimates can be made with coarse measurements. Manufacturers typically rely on established design calculations to ensure the magnetic field's strength and direction are correct, rather than focusing on exact energy values. The distinction between 1 J or 2 J of energy in the magnetic field is often negligible in practical applications. Understanding these principles is essential for effectively working with permanent magnets.
