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The flux tube provides a good approximation at angles close to 90 degrees with respect to the interpolar axis. This is because the flux tube approximation is most accurate for magnetic field lines that are perpendicular to the direction of the current flow, which in many contexts correlates to being perpendicular or near-perpendicular to the interpolar axis in magnetized plasma configurations or in models of magnetic confinement systems.
Answer: c
Explanation: The flux tube crossing the air gap at 60° from the interpolar axis will always give a good approximation. The calculation of the magnetizing mmf should be based upon the value of the flux density at 60° from the interpolar axis.