Can Magnetic Fields Heat Metal & Create Eddy Currents?

[brainyman89]

let's say we have a square piece of metal and we put this piece in a variable magnetic field, would it get heated? is this the idea of a current?

If we have a rotating metal disk (as the case of a saw for instance), and the we put this rotating disk in a constant uniform magnetic field such that angle between normal vector and B vector is 0 and is not changing since the disk is rotating along the normal axis, would this disk stop rotating? if yes how comes eddy current are induced though we are not changing any of these area, B nor the angle? if no then what is the idea of creating brakes by eddy currents?

if we have a short piece of straight rectilinear wire in motion with velocity V in a uniform constant magnetic field, would we have a potential difference(voltage) on the edges of this wire? if yes how comes we got induced emf without changing any of these area, B nor the angle?

thanks in advance

 

[brainyman89]

anybody?

 

[brainyman89]

what is the idea of eddy current and how does it differ than the induced current?

 

[brainyman89]

can anybody help?

 

[sardar]

I can confirm that magnetic fields have the ability to heat metal and create eddy currents. This is known as the Joule heating effect, where an electric current is induced in a conductor when it is placed in a changing magnetic field. This current generates heat due to the resistance of the metal.

In the case of a rotating metal disk, the eddy currents will be induced due to the changing magnetic field as the disk rotates. This will result in the disk experiencing a braking force, causing it to slow down and eventually stop rotating.

Similarly, in the case of a straight wire in motion in a magnetic field, the wire will experience a force due to the induced current. This force will cause a potential difference, or voltage, to appear across the wire, resulting in an induced EMF.

In both cases, the key factor is the changing magnetic field. It is not necessary for the area or angle between the magnetic field and the conductor to change for eddy currents to be induced. As long as there is a changing magnetic field, eddy currents can be induced in a conductor, resulting in heating or the generation of an EMF.

I hope this explanation helps to clarify the concept of eddy currents and their relationship to magnetic fields. If you have any further questions, please do not hesitate to ask. Thank you.