Ampere's circuital law states that the line integral of the magnetic field around a closed loop is equal to the sum of the enclosed current multiplied by the permeability of free space.
Ampere's circuital law is one of the four Maxwell's equations that describe the behavior of electric and magnetic fields. It relates the magnetic field to the current that creates it, making it a fundamental law in electromagnetism.
No, Ampere's circuital law can only be applied to uniform magnetic fields where the strength of the field is constant at all points. In non-uniform fields, the law does not hold true.
Ampere's circuital law deals with the relationship between the magnetic field and the current that creates it, while Faraday's law of induction describes the relationship between the electric field and the changing magnetic field. They are two separate laws that are both essential in understanding electromagnetism.
Ampere's circuital law is used in a variety of practical applications, such as designing electromagnets, motors, and generators. It is also used in the study of magnetic materials and in the development of magnetic storage devices, such as hard drives.