Ampere's Circuital Law

Inside this lesson

State Ampere's circuital law and identify each quantity in the equation
Determine when Ampere's law is practical versus when Biot-Savart is the better tool
Apply the Amperian-loop recipe to derive the magnetic field of an infinite straight wire
Calculate B at a specified distance from a long current-carrying wire

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Educational content covering topics typical of a first- and second-year electrical engineering curriculum. Not a substitute for accredited coursework, and not suitable for real antenna, transmission-line, or signal-processing system design without review by a licensed professional engineer.