Question

Applications of Ampere circuital law ??

Answer 1

For a solenoid, of a finite length L( for which we cannot assume: length >> diameter) the magnetic field, at axial points, has a nearly constant value over only those axial points that lie close to its center

Ampere's circuital law states that the line integral of the magnetic field  (circulation of H ) around a closed path is the net current enclosed by this path

Ampère's Law has many practical applications. It can be used to know what magnetic field is generated by an electric current. This is useful in building electromagnets, motors, generators, transformers, and more. ... Magnetic field that is perpendicular to the curve is excluded