Magnets and magnetic properties

Introduction to Magnets

Think about the small black stones found inside old radio speakers or the strip that keeps your fridge door closed. Those are magnets. A magnet is simply a material that can pull or attract things made of iron, steel, or cobalt towards itself.

In simple terms, a magnet is a special object that acts like a 'glue' for metals like iron.

Properties of Magnets

If you hold a magnet, you will notice it has two ends. These ends are called poles. Every magnet has a North pole (N) and a South pole (S). Even if you break a magnet into many small pieces, each piece will still have a North and a South pole.

Think of poles as the 'power centers' of the magnet where the pulling force is most active.

Law of Magnetism

If you try to bring two magnets together, you will feel something. If you bring two North poles together, they will push each other away. But if you bring a North pole near a South pole, they will jump together and stick.

The Law of Magnetism states that like poles repel each other while unlike poles attract each other.

Simply put, same sides hate each other, but opposite sides love each other.

Magnetic and Non-Magnetic Materials

Not everything can be picked up by a magnet. If you put a magnet near a plastic cup or a piece of wood, nothing happens. We group materials into two categories based on how they react to magnets:

Magnetic Materials: These are materials that a magnet can pull. Examples include Iron, Steel, Nickel, and Cobalt.

Non-magnetic Materials: These are materials that a magnet cannot pull. Examples include Copper, Aluminum, Wood, Plastic, and Gold.

Magnetic Induction

Have you ever noticed that if you leave a needle stuck to a strong magnet for a long time, the needle itself starts to pick up other small pins? This is called Magnetic Induction. The magnet 'convinces' the iron nail to behave like a magnet temporarily.

This means a magnet can turn an ordinary nail into a temporary magnet just by being close to it.

Permanent and Temporary Magnets

Steel is hard to magnetize, but once it becomes a magnet, it stays that way for a long time. We call this a Permanent Magnet. Iron is very easy to magnetize, but it loses its power quickly once the main magnet is removed. We call this a Temporary Magnet.