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MIT 8.02 Electricity and Magnetism, Spring 2002 12 Online
OpenStudy (anonymous):

is the formula for infinite solenoid \[\mu n i \] valid for solenoids of all cross sections

OpenStudy (anonymous):

Yes, it is valid for any cross section shape as long as it remains the same along the solenoid.

OpenStudy (anonymous):

if it is an infinite solenoid ,then yes. this formula can also be used as an approximation when the cross-section is very small compared to its length

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