# Why can't weak core-less electromagnets be used in conjunction with strong permanent magnets to perpetually harvest energy? [closed]

Why can't weak core-less electromagnets be used in conjunction with strong permanent magnets to perpetually harvest energy?

Magnets will attract ferrous materials but some materials like copper or silicon are not effectively magnetic unless a current is passed through them, if that is the case then why can't we arrange a core-less electromagnet made of copper in conjunction with strong permanent magnets to create a system in which one could easily harvest energy? Once a weak current is passed through the core-less electromagnet it could become attracted to a strong permanent magnet due to a relatively weak magnetic field surrounding it, energy would be harvested by means of compression between the electromagnet and the strong permanent magnet, the electromagnet would be turned off and another permanent magnet would drag the electromagnet away by attracting an attached permeable material, then the electromagnet could be switched back on and the cycle would reset.

The simple device below portrays my question in better light

A= Weaker permanent magnet

D= Ferrous material

C= Core-less copper electromagnet (Copper circuit)

B= Very strong permanent magnet

(A and D are both out of the effective magnetic range of C and B)

D is instantly attracted to A

A very weak current in passed through C creating a weak but existent magnetic field, it's instantly attracted to B the much stronger permanent magnet, dragging D from A, since C's current/magnetic field can be extremely weak as long as B's magnetic field is extremely strong, couldn't one perpetually harvest energy from this arrangement?

I had another picture but I don't have enough reputation to post it

I'm not overly familiar with the formal physical laws that will most likely prevent a system like this from working so a practical answer will be highly appreciated, I hope these images will help explain my question.

Thank you.

## closed as off-topic by AccidentalFourierTransform, John Rennie, Jon Custer, user191954, Kyle KanosOct 28 '18 at 11:15

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "We deal with mainstream physics here. Questions about the general correctness of unpublished personal theories are off topic, although specific questions evaluating new theories in the context of established science are usually allowed. For more information, see Is non mainstream physics appropriate for this site?." – AccidentalFourierTransform, Jon Custer, Community, Kyle Kanos
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• Interestingly, we do have use for a similar circuit in generators, but we don't use it to generate free energy (there's no free lunch). In modern generators, we have very large powerful electromagnets, because using permanent magnets would be prohibitively expensive. We waste a little of the generator's production to keep this electromagnet operating (wasted by turning into heat). However, when you want to start the generator up, there's no power to start the electromagnet! Our solution: a small permanent magnet that permits generating just enough power to feed the – Cort Ammon Dec 1 '16 at 3:52
• electromagnet, so that it can "bootstrap" itself. It's no perpetual motion machine. There's waste heat all through the process, but it turns out to be a more cost effective way of generating power than trying to use all permanent magnets! – Cort Ammon Dec 1 '16 at 3:53