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Past exam of the physics 2 paper of the University of Oxford / 2013 resit / 9 / iii / Solution

Codex (@codex,  0) ... Year 1 of the physics course of the University of Oxford Physics 2 paper of the University of Oxford Past exam of the physics 2 paper of the University of Oxford 2013 resit 9 iii
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Reversing one winding reverses its signed coupling to the other, while its self-inductance is unchanged. With the same north-to-south current references,
M⟶−M,LA​,LB​ unchanged.​
(1)
Equal currents then produce opposing magnetic fields: the signed axial field is proportional to (n1​−n2​)I, rather than (n1​+n2​)I. Which direction is positive must be fixed by the right-hand rule and the actual winding orientation.

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