A long solenoid of length L has a mean d...

A long solenoid of length `L` has a mean diameter `D`. It has `n` layers of windings of `N` turns each. If it carries a current `‘i’` the magnetic field at its centre will be

Proportional to `D`

Inversely proportional to `D`

Independent of `D`

Proportinal to `L`

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