Maxwell coil

A Maxwell coil is a type of coil that is used to create a magnetic field. Think of it as a big, round rubber band that you can stretch out so that it sits flat like a pancake. When you pass electricity through the coil, it creates a magnetic field that flows around the outside of the coil, kind of like a big invisible bubble.

Now, imagine that you take another wire and run it through the center of the coil. This wire is connected to a device that measures how much electricity is flowing through it. When you pass electricity through the coil, it creates a changing magnetic field that flows through the wire in the center of the coil. This changing magnetic field causes electricity to flow through the wire in the center of the coil, and this electricity can be measured by the device connected to it.

This is important because it allows us to measure how much electricity is flowing through the coil without actually touching it. This is useful in situations where touching the coil could be dangerous or where it's difficult to get a physical connection to the coil.

So, to summarize, a Maxwell coil is a coil that creates a magnetic field when electricity is passed through it. This magnetic field can be used to measure how much electricity is flowing through the coil without physically touching it.