A homemade metal detector

A homemade metal detector. This is the second item that is in the video. I assume it's iron or alloy. For example, steel, the magnetic permeability of which is very different from copper. This means that the inductance of the coil is very different. Consequently, according to Thomson's formula, the frequency of the oscillatory circuit also changes. The oscilloscope is programmed to visualize this change. This is how all induction type metal detectors work. I'm glad you're with me. Sincerely, Yuri Kovalenok #physics #science