[" A current I flows in an infinitely lo...

[" A current I flows in an infinitely long wire with cross section in the form of a "],[" radius "R" .The magnitude of the magnetic induction along its axis is "],[[" (1) "(18)/(2 pi^(2)R)," (2) "(mu_(0)!)/(2 pi R)],[" (3) "(Ad)/(d-2 pi)," (4) "(mu_(0)!)/(pi^(2)R)]]

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[" A current I flows in an infinitely long wire with cross section in the form of a "],[" radius "R" .The magnitude of the magnetic induction along its axis is "],[[" (1) "(18)/(2 pi^(2)R)," (2) "(mu_(0)!)/(2 pi R)],[" (3) "(Ad)/(d-2 pi)," (4) "(mu_(0)!)/(pi^(2)R)]]

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