Laws of Magnetism - JSS3 Basic science Lesson Note

The laws of magnetism describe the behavior of magnetic fields and the interactions between magnets and magnetic materials. These laws include:

 

Law of attraction and repulsion: Like magnetic poles repel each other, and opposite poles attract each other. This fundamental law governs the behavior of magnets and magnetic materials.

 

Law of magnetic poles: Every magnet has two poles - north and south. Magnetic field lines flow from the north pole to the south pole outside the magnet and from the south pole to the north pole inside the magnet.

 

Inverse square law: The strength of the magnetic force between two magnets or a magnet and a magnetic material decreases with the square of the distance between them. In other words, doubling the distance between two magnets reduces the force between them to one-fourth of its original strength.

 

Magnetic induction: When a magnetic material is placed in a magnetic field, it becomes magnetized, acquiring its own magnetic field. This phenomenon is known as magnetic induction and is the basis for the operation of electromagnets and transformers.