When finding the angles for the finite length Biot-Savart formula of a filamentary conductor(adsbygoogle = window.adsbygoogle || []).push({}); H= I*(cos(α_{2}) - cos(α_{1}))a_{Φ}/(4πρ), is α_{1}supposed to be calculated at the start of the current, and α_{2}at the end? I'm just wondering because my book does it this way and vice-versa, so I'm not entirely sure which way is correct.

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# Question on Biot-Savart Law for Finite Length Filamentary Conductor

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