What leads to eddy current loss in conductors?

Eddy current loss in conductors primarily occurs due to the phenomenon where changing magnetic fields induce circulating currents within the conductor itself. The key to understanding this effect lies in the concept that whenever there is a change in a magnetic field surrounding a conductor, such as during the rapid oscillation of voltage, these induced currents create loops within the material.

The heating of the core with increasing resistance is closely associated with the losses that occur from these eddy currents. When a conductor is exposed to alternating current, the constantly changing direction of the current leads to the generation of eddy currents. These currents flow in opposite directions within the conductor, causing localized heating and energy loss due to the inherent resistance of the material. This is a critical aspect of electromagnetic theory, where the efficiency of electrical systems can be significantly impacted by eddy current losses, particularly in transformers and other inductive devices.

It's important to note that while the other options touch on aspects related to conductors and electrical systems, they do not address the specific mechanism of eddy current loss as accurately as the concept involving heating due to increasing resistance does. Understanding this relationship aids in optimizing the design and operation of various electrical components to minimize energy losses.