Solution (source code)

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= Solution

Pairing adjacent contributions from the <Biot-Savart law> gives magnitude $\mu_0IN(N+1)/(4\pi a)$, directed opposite to the first wire's field at the observation point.

Full derivation: <past-exam-of-the-physics-b-course-of-the-university-of-cambridge/2010/paper-2a/section-a/2/solution>.

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