Two long straight aluminum wires, each of diameter 0.42 mm, carry the same current b? Physic's Q: Please Help!?

(Idlr sin?)/r^3 Here, at 0º or 180º, B becomes minimum, i.e. 0, at 90º only, B is maximum. Therefore, if you want to get a maximum magnetic field out of the current carrying wire, you get it at 90º.

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