Okay kiddo, have you ever played with magnets before? You know how they stick to some things and not others right? Well, that's because some materials are more attracted to magnets than others. We call this attraction "magnetic susceptibility".
Let's break it down like this: every material is made up of tiny particles called atoms. Inside each atom, there are even smaller particles called electrons that spin around. Some materials have electrons that spin in a way that makes them more likely to be attracted to magnets, while others have electrons that spin in a way that makes them less likely to be attracted to magnets.
So when we say a material has high magnetic susceptibility, it means that its electrons are spinning in a way that makes it very attracted to magnets. And when we say a material has low magnetic susceptibility, it means that its electrons are spinning in a way that makes it not very attracted to magnets.
Scientists use magnetic susceptibility to study all kinds of materials, from rocks to metals to living things like animals and plants. It helps them understand how these materials interact with magnets and how they might be used in things like technology and medicine.
So there you have it, magnetic susceptibility is just a fancy way of talking about how much different materials like magnets. Pretty cool, huh?