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Fields & electromagnetismUndergraduate & beyond

Ampère's law

For steady currents, the circulation of magnetic field around a closed path equals μ₀ times the enclosed current.

Notes & references

The Ampère–Maxwell form adds displacement current for time-varying electric fields.

Also known as: Ampere circuital law

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A growing reference from school fundamentals through undergraduate and selected advanced physics. No finite collection contains every specialised equation or theory; use topic and level filters, and always check assumptions.

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Equations use SI quantities unless stated otherwise. Numerical values retain the units, precision and conditions of their source. Diagrams are explanatory models; their captions identify simplifications.

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