 Magnetic-field cancellation between oppositely driven coaxial loops (source code)

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= Magnetic-field cancellation between oppositely driven coaxial loops

If coaxial loops of radii $R$ and $2R$, separated by $D$, carry currents $I$ and $2I$ in opposite senses, their on-axis fields cancel between the loops at distance $D/3$ from the smaller loop.

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