Applications of Ampere law:-
- Infinite straight current-carrying wire:-
In this, the current is longitudinal (source is longitudinal) but the field produced is circumferential. The magnetic field is tangential to every point of the observed path.
- M.F of cylindrical current-carrying wire:-
A cylindrical wire having radius ‘R’, carrying a uniform current density
The magnetic field will be circumferential. We can choose a circular path as the integration path to calculate the magnetic field anywhere.
For outside points, the M.F is similar to the field attained in the case of an st. current-carrying wire. That means, for outside points, it is behaving as if the entire current is passing through the axis.