Final answer:
Ampere's Law is used to calculate the magnetic field created by current in a wire. To find the magnetic field intensity at a point, you need to consider the current distribution and apply Ampere's Law.
Step-by-step explanation:
Ampere's Law is used to calculate the magnetic field created by current in a wire. To find the magnetic field intensity at a point, you need to consider the current distribution and apply Ampere's Law. This law states that the line integral of the magnetic field around a closed loop is equal to the product of the current passing through the loop and the permeability of free space.
In other words, the magnetic field strength at a point can be found by integrating the magnetic field at each segment along a closed loop and summing up the contributions from those segments.
For example, if you have a current loop consisting of two concentric circular arcs and two perpendicular radial lines, you can calculate the magnetic field at point P by applying Ampere's Law and considering the current distribution in the loop.