What are Eddy Currents?

Eddy currents are indeed loops of electric current that are induced within conductors when they are exposed to a changing magnetic field. This phenomenon is a result of Faraday's law of electromagnetic induction, which explains how a changing magnetic field can induce currents in conductive materials.

These induced currents circulate within the conductor, creating their own magnetic fields that can oppose the original magnetic field, leading to energy loss primarily in the form of heat due to the resistance of the material. This is an important concept in the design of electrical equipment, as excessive eddy currents can lead to inefficiencies and overheating.

The other options either misrepresent the nature of eddy currents or do not accurately describe their behavior in electrical circuits. While positive and negative currents, constant current flow, and circuit behavior are important concepts in their own right, they do not capture the specific characteristics and implications of eddy currents as described in the correct choice.