Coercivity

Coercivity is like a magnet's personality. Some magnets are really easygoing and will let go of objects easily, while others are really stubborn and hold onto objects very tightly. Coercivity is a way to measure how "stubborn" a magnet is, or how hard it is to make it let go of an object it is magnetically attracted to.

When we talk about coercivity, we are talking about how hard you have to work to change the magnetic fields in a material. Think of a magnetic material like a giant jigsaw puzzle: the little pieces are all aligned to create a magnetic field. When you put that magnet next to something else, the puzzle pieces all try to align with the pieces in the other object. That's how the magnet sticks to the object.

But if you want to get the magnet off the object, you have to work to throw the pieces out of alignment. The higher the coercivity of the magnet, the harder you have to work to change the alignment of the pieces and break the magnetic force holding the magnet to the object.

So, if you have a magnet that has a high coercivity, it will be really hard to get it to let go of an object it's attached to. If you have a magnet with a low coercivity, it will be really easy to separate it from an object it's attracted to. Coercivity is measured in units called Oersteds (Oe), and magnets with higher coercivity will have a higher number of Oersteds.

In summary, coercivity is like a magnet's personality that tells us how easily it will let go of an object it's attracted to. The higher the coercivity, the harder it is to make the magnet let go.