I am trying to understand why the magnetic field outside a solenoid of very long length can be assumed to be near zero.
I gather that the field inside the solenoid will be very dense and therefore strong, and that the field lines that loop back round outside the solenoid can spread out. Is this the correct understanding.
If so why do the field lines spread out outside the solenoid so much so that their density tends to zero as the solenoid gets longer?
I gather that the field inside the solenoid will be very dense and therefore strong, and that the field lines that loop back round outside the solenoid can spread out. Is this the correct understanding.
If so why do the field lines spread out outside the solenoid so much so that their density tends to zero as the solenoid gets longer?
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