The change in current through a conductor directly affects the magnetic field strength at a given point according to Ampere’s Law. Specifically, an increase in current leads to a proportional increase in the strength of the magnetic field, and a decrease in current results in a corresponding decrease in magnetic field strength.

Ampere’s Law quantitatively expresses this relationship, stating that the magnetic field (B) at a given point around a current-carrying conductor is directly proportional to the current (I) passing through the conductor. Mathematically, this relationship is represented as:

B∝I

In simpler terms, if the current through a wire increases, the magnetic field around it becomes stronger, and if the current decreases, the magnetic field weakens. This fundamental principle is essential for understanding and manipulating magnetic fields in various applications, including electromagnets, transformers, and other electrical devices.