How to magnetize a concrete wall?

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Concrete is primarily an insulator and cannot be magnetized under normal conditions, even with high voltage, as it does not conduct electricity effectively. While electric current can generate a magnetic field, the concrete itself does not retain magnetization once the current ceases. The discussion highlights that concrete can contain metallic aggregates, which may become magnetized under specific conditions, such as during electric welding. Lightning strikes can theoretically magnetize steel reinforcement within concrete due to the heavy currents involved, but this does not apply to the concrete itself. Ultimately, ordinary concrete cannot be magnetized, and any magnetic properties would depend on the presence of metals or other materials within it.
  • #51
Not so much trolling; he hasn't actually made anyone cry yet. But attention-seeking, perhaps, in an unimaginative way.
 

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