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Suppose We have a charged rotating cylinder such that the magnetic field inside it is the same as a solenoid of the exact same dimensions. Obviously, the current per-unit length for both will be the same.

Now, what can we say about the magnetic flux in the cylinder since there is no n (turns per unit length)? What can we comment about inductance? It depends on n and not current.

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  • $\begingroup$ Cab you give the charge on the cylinder to achieve the same current? Why nor spin a charged coil first coil ? and discuss the charge needed $\endgroup$
    – trula
    Commented Aug 21, 2023 at 21:36
  • $\begingroup$ The charge density and angular velocity will determine the current. You are free to choose any value and match the field with a solenoid of same dimensions $\endgroup$
    – Physics Kota
    Commented Aug 22, 2023 at 6:15

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