The most fundamental law of magnetism states that like poles repel, and unlike poles attract. This means that two north poles or two south poles will push each other away, while a north pole and a south pole will pull towards each other. This principle governs the behavior of magnets and underlies many magnetic phenomena.
However, the term "magnetic law" is broad and encompasses several principles beyond just the attraction and repulsion of poles. Several other relevant laws and principles in magnetism include:
Key Laws and Principles in Magnetism:
-
Faraday's Law of Induction: This law describes how a changing magnetic field creates an electric current. It's crucial for understanding how generators and transformers work. A changing magnetic flux induces a voltage in a coil of wire. The magnitude of the induced voltage is proportional to the rate of change of the magnetic flux. (Magnetic flux and Faraday's law (article) | Khan Academy)
-
Curie-Weiss Law: This law describes the relationship between the magnetic susceptibility of a material and its temperature, particularly in paramagnetic materials. (Tutorial: a beginner's guide to interpreting magnetic susceptibility ...)
-
Hopkinson's Law (for magnetic circuits): This law is analogous to Ohm's law in electrical circuits. It relates magnetic flux, magnetomotive force, and magnetic reluctance in a magnetic circuit. (Magnetic circuit - Wikipedia)
-
Magnetic Snell's Law: This law describes the refraction of spin waves at the interface between two magnetic materials. (Magnetic Snell's law and spin-wave fiber with Dzyaloshinskii-Moriya ...)
These laws and principles, along with others, provide a comprehensive understanding of magnetism and its applications in various fields like electricity generation, data storage, and medical imaging. The basic attraction and repulsion of magnetic poles remains the foundational concept, however.
