Ampere’s law is used to calculate the magnetic field generated by an electric current. It has many applications, including:
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Calculating magnetic fields
Ampere’s law can be used to calculate the magnetic field inside a toroid, the magnetic field inside a conductor, or the magnetic field around a long straight wire.
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Calculating forces
Ampere’s law can be used to calculate the forces between two currents.
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Building machines
Ampere’s law is used in the construction of generators, motors, transformers, and electromagnets.
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Simplifying calculations
Ampere’s law can be used instead of Biot-Savart’s law because it uses symmetry to simplify calculations.
Ampere’s law is valid for all closed paths surrounding a conductor, but it can be difficult to calculate the integral along some paths.
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