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how to make a solenoid multiple layers winding to produce a desired magnetic field? In that case, the normal solenoid formula(muni) will be valid or not?

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    – Ariser
    Aug 28, 2019 at 7:21

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The formula still works but the magnetic coupling from the wire-turns to your core will be worse. It is quite normal to have multiple layers of wire-turns on a core.

In the typical transformer equivalent circuit this will present itself as a greater portion of series inductance.

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