ampere's law: meaning, definition, pronunciation and examples

Both calculate magnetic fields from currents. The Biot-Savart law is a 'building block' law that gives the field from a tiny current element. Ampere's law is an integral law relating the total field around a closed loop to the total current enclosed. Ampere's law is often simpler for situations with high symmetry.

The original Ampere's law is only strictly true for magnetostatics (steady, non-changing currents). James Clerk Maxwell modified it by adding the 'displacement current' term, creating the Ampere-Maxwell law, which is always true and is one of the four fundamental Maxwell's equations.

No, not directly. Ampere's law in its standard form relates magnetic fields to electric currents. A bar magnet's field arises from the intrinsic spin of electrons (atomic currents), not a macroscopic conduction current. To use Ampere's law for materials, one must consider bound currents, which is an advanced application.

The line integral (circulation) measures the total 'twist' or 'curl' of the magnetic field around a path. Ampere's law states that this total twist is sourced *only* by the current passing through the area bounded by that path, making it a powerful tool for relating global field properties to their sources.

A fundamental law of electromagnetism that quantitatively relates the magnetic field around a closed loop to the electric current passing through that loop.

Ampere's law is usually highly technical/scientific in register.

Ampere's law: in British English it is pronounced /ˈæmpeəz lɔː/, and in American English it is pronounced /ˈæmpɪrz lɔ/ (also /æmˈpɪrz/ for 'Ampere'). Tap the audio buttons above to hear it.