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Physics
Classical Physics
Electromagnetism
Coil Around A Tube - Iron Cylinder Inside Tube - How Many Turns Needed?
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[QUOTE="hutchphd, post: 6831182, member: 635497"] A long solenoid does not provide a long throw of strong pull (as [USER=8921]@berkeman[/USER] points out). Once the leading edge of rod gets into the solenoid, the ferrous rod is pretty well magnetized all down its length and the pull becomes much diminished. The useful range will be ~the diameter of the pole opening. This is one reason the scrapyard uses a flat cup magnet (on a crane). Also [B]for a given available voltage[/B], the strength of the pull will depend only on the magnet volume. More turns will draw less current because the wire is thinner with higher resistance and it is basicly a wash. But higher voltage will give more pull for the same magnet. So your "throw" requirement is tough. [/QUOTE]
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Physics
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Electromagnetism
Coil Around A Tube - Iron Cylinder Inside Tube - How Many Turns Needed?
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