Hello, I have kind of an odd question here. I was wondering how to make an electric coil that will naturally resonate at a perticular frequency. I am a novice when it comes to the associated physics so I'm hopeing that someone can explain this to me. I also have another related question. I heard somewhere that the earth has an electromagnetic field that resonates at a perticular frequency (I've heard the phenomenia referred to as Schunmen Resonance). Is this in deed true? If so, I wanted to try and make a coil that would resonate with this 'natural' frequency. Any help is appreciated.