I had understood the magnetic field outside a toroid to be zero, but the 'barrel toroid' in the ATLAS detector at CERN I think generates a magnetic field at the centre of the 'barrel' ie. outside of the surrounding toroids. Have I misunderstood the magnetic field from a barrel toroid?
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$\begingroup$ Note, ATLAS includes several magnets, including a solenoid in the middle. Would you clarify what exactly are you asking about? $\endgroup$– user1079505Commented Nov 18 at 16:31
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$\begingroup$ I am asking about the 8 toroids around the edge and whether they contribute to the magnetic field in the centre of the 'barrel'. Thanks $\endgroup$– PhysMsCommented Nov 27 at 20:49
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