Concept: Coulombโs Inverse Square Law for magnetism describes the interaction between two magnetic poles (similar to electrostatic force between charges). It applies to ideal magnetic poles and helps quantify magnetic force. The law states that:
Like poles repel and unlike poles attract.
The magnitude of force depends on pole strength and distance between poles.
Statement of Coulombโs Law (Magnetism): The force between two magnetic poles is:
Directly proportional to the product of their pole strengths.
Inversely proportional to the square of the distance between them.
Acts along the line joining the two poles.
Mathematical Expression: Let,
= pole strengths
= distance between poles
Then, Combining both relations: Introducing proportionality constant: where,
= permeability of free space
Nature of Force:
Attractive for unlike poles
Repulsive for like poles
Acts along the straight line joining the poles