Comments by "Jovet" (@jovetj) on "Solenoid Basics Explained - Working Principle" video.

  1. The first coil was uninsulated because it was one strand of a larger conductor, but it worked fine because the loops of the coil were not allowed to touch one another.
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  2. It's the same as how a motor works, just the opposite. In a motor, a electromagnet creates a magnetic field which acts on a fixed magnet to generate rotational force. In a generator, a rotating magnetic field acts on a conductor to produce electricity.
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  3. The nail is made out of iron, which is naturally magnetic. When the nail is inside the magnetic field, the field and iron atoms exert force on one another, and the weaker one moves.
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  4. Winding the opposite direction would have the same effect as reversing the polarity.
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  5. Science does not prove things to begin with, so your argument is moot.
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  6. No, if I understand you right, the enamel makes the wire insulated. It is just a very thin insulation.
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  7. Magnetic fields have a "flow" to them like an electric current; it's no coincidence that magnetism and electricity are so closely related. Magnetic fields are realized by photons, which also is what all electromagnetic radiation (e.g. light) is. The N/S pole names drive from the magnetic field of the Earth itself. When you hear on the news about the "magnetic pole flip" that might be coming ... it's talking about the Earth's magnetic field literally reversing... so N would become S, and S would become N. One of science's holy grails is finding a magnetic monopole — a magnet with just one pole!
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  8. No, both the direction of the wind AND the polarity matter.
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  9. Needs to be enameled or insulated, yes. The loops can't connect electrically with each other, except through the wire itself.
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  10. If the wire or its insulation has a flaw, it could eventually become shorted. If too much voltage is applied or the coil gets too hot, the insulation could break down and the coil could short. If the wire has a nick in it, it could eventually break and the coil will no longer be complete. Remember that the magnetic forces acting on the nail can also act on the coil wire and move them, too! Well-designed and built coils should minimize this effect, but if there's an inherent flaw, it may cause eventual failure.
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  11. Because it's sensitive to magnetic fields, because it's made out of a magnetic material (iron). The magnetic field in the coil can move the nail.
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  12. Yes. That was demonstrated in the video.
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  13. The shape and density of the winding, the voltage, the gauge of the wire, all of those play into the shape and strength of the magnetic field. When two forces are acting on each other, the stronger one wins. The nail has its own magnetic force, but it's weaker than the coil, so the nail moves. Where and how far it moves depends on the strength and shape of the acting magnetic domain.
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  14. The word solenoid is derived from French and Greek.Yes, the wire must be insulated. It needs to go the entire long path, around and around and around. That is what concentrates the magnetic field.
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  15. Both.
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  16. There is some resistance in the wire itself, and there is power bleeding off into the magnetic field. That is called induction.
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  17. Electron current flow is electricity. Electron current flow creates a magnetic field around the substance flowing the current. Conversely, moving a magnetic field near a substance can induce an electron current flow inside it.
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