Eddy currents are produced when

Eddy currents are produced when a conductor is exposed to a changing magnetic field. Here are the steps that explain this process:

1. A magnetic field is applied to a conductor: Eddy currents are induced in conductors when they are placed in a magnetic field. This is due to Faraday's law of electromagnetic induction, which states that a change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil.

2. The magnetic field changes: The key to inducing eddy currents is that the magnetic field must be changing. This can happen either because the magnetic field itself is fluctuating or because the conductor is moving through a stationary magnetic field.

3. Current loops are formed: When the magnetic field changes, it causes electrons in the conductor to move, creating loops of electrical current within the conductor. These loops of current are called "eddy currents".

4. Eddy currents create their own magnetic field: According to Ampere's law, any current-carrying conductor will produce a magnetic field. Therefore, the eddy currents create their own magnetic field, which opposes the original changing magnetic field.

5. Energy is dissipated as heat: The eddy currents flowing through the resistance of the conductor will cause power to be dissipated in the form of heat. This is often undesirable as it represents energy loss, but can be useful in applications like induction heating.

In summary, eddy currents are produced when a conductor is exposed to a changing magnetic field, causing loops of current to form within the conductor, which then create their own opposing magnetic field and dissipate energy as heat.