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How can I expand the magnetic field to apply over larger distances?

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Hol

Hol

Electrical
Dec 18, 2013
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An electromagnet can pull with 100N on ferromagnets 0.5cm away, when r is near zero the force increases significantly, what are the possible methods of keeping that same rate of force (100N) applied over large distances over 0.5cm?
Increasing the size of the electromagnet? Or applying more voltage?
 
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As I increase the turns of the electromagnets, eventually more voltage is needed to maintain the same magnetic field. Thank you @IRstuff, eventually the field will become larger. But would the force change and become greater?
 
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