Question

Why do the eddy currents have a negative effect, as they produce?

Answer 1

Eddy currents:

1. An electric current induced by an alternating magnetic field is called an eddy current.
2. Eddy currents are formed in a conductor whenever it is exposed to a time-varying magnetic field. Such currents flow through the conductor, producing a magnetic field of reverse polarity as the applied magnetic field.
3. The involvement of multiple magnetic fields produces a force that opposes the change in magnetic flux. Consequently, because of the conductive material's internal resistance, the eddy currents are dissipated as heat and the force has been lost.
4. Even as eddy currents diminish, energy is withdrawn from the systems, resulting in a damping effect.

Therefore, eddy currents have a negative effect, as they produce heating and damping.