[Bored chemist]

It shows that a ferrite rod and a steel coil have different effect when used as the core of a solenoid.

That's why ferrite was invented.

[hamdani yusuf (OP)]

Here's a great video explaining how and why induction heaters work.

[Origin]

Yep, good video and a nice way to end the thread.

[hamdani yusuf (OP)]

Yep, good video and a nice way to end the thread.

He promised a follow up video. If you are no interested, you can simply skip it.

[hamdani yusuf (OP)]

Here's a video of induction heater involving a ferrite rod.
The first interesting thing we can find is that the insertion of ferrite rod can reduce total power consumption, even though it absorbs some energy and generate heat. To do that, it must have taken the energy from somewhere else, e.g. the energy that was previously spread to the surrounding of the coil.

Or the energy that was previously dissipated by the coil.

[hamdani yusuf (OP)]

0:00​ Wrong Way of Detecting Metal
1:48​ Theory Behind How Metals Effect Inductance
6:10​ More Fake and Real Metal Detector Video Tutorials
7:32​ Designing a ?Simple? Metal Detector Circuit
15:48​ Testing the DIY Metal Detector Circuit

This video provides important information on how metal objects react to induced AC currentcurrent, depending on the frequency.