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Why can't you touch the hollow inductor coil_Inductance coil_Electromagnetic coil

Why can't you touch the hollow inductor?

Since the frequency of the circuit using the hollow inductor is high, if the parameters of the sumida inductor are changed slightly, the frequency of the circuit composed of it will be greatly changed, resulting in the circuit not working or the data supplied by it being inaccurate. .
The main parameters affecting the inductance coil - the main reason for the change in inductance is the magnetic medium, the density of the coil (tightness), the number of turns of the coil and the diameter of the wire, the line data, etc. If you touch it with your fingers, it will cause the magnetic medium. (It was originally air, now it is affected by your fingers) and the change in coil density (moving, the tightness has also changed), so you can't touch the hollow inductor.

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