It’s a well known fact that

Why? How? Almost, every book (really every book) takes that fact as

David J. Griffiths does the prove but I find his proof very very

Solenoid 1

Solenoid 2

Solenoid 3

Solenoid 4

So, is there any other proof of why the magnetic will be uniform and parallel to the axis of the solenoid?

*For a very long coil the field exists practically only in the interior. There it is uniform and parallel to the axis of the coil*.Why? How? Almost, every book (really every book) takes that fact as

*granted*and then they solve for the magnitude of magnetic field by drawing a rectangular**Amperian Loop**.David J. Griffiths does the prove but I find his proof very very

*personal*. Here are the images, have a look:Solenoid 1

Solenoid 2

Solenoid 3

Solenoid 4

So, is there any other proof of why the magnetic will be uniform and parallel to the axis of the solenoid?

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