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## Main Question or Discussion Point

I was inquiring about how much force will a 1000 lb pull force electromagnet pull at 4-6 inches away from the magnet

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I was inquiring about how much force will a 1000 lb pull force electromagnet pull at 4-6 inches away from the magnet

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There is no way of knowing.

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it is a 6 inch radius and it is cylinder shaped pulling a 4 inch cylinder shaped object

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That's science-speak for 'impossibly complicated and impossible to know without doing lots and lots and lots of careful measurements and probably not even then'in a complex way

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Assuming the magnet is a sphere with a 6 inch radius, the 1000 lb force is effective at 6 inches from the magnet. Thus 4 and 6 inches from the magnet becomes 10 and 12 inches respectively. Simplest force law representation is the inverse square law, m/r^2. Since m/r^2 = 1000 where r = 6 at the magnet surface, then m = 3600. Now solve for other r. Note: this is only roughly valid in the units provided, and a slew of other assumptions about geometry and material properties. But probably good enough for many purposes.

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I should imagine this is a ring magnet anyway. The field would be highly localised.

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Yes, if the magnet is flat, and the 1000 lb pull is at the flat surface, you've blown my calculation out of the water :tongue:

I should imagine this is a ring magnet anyway. The field would be highly localised.

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