Design Electromagnet: Pickup 5kg Iron at 300mm Distance

[Paramjit Singh]

Homework Statement

I want to design Electromagnet in aluminium strip/wire for pickup 5kg iron piece at distance of 300mm and i try many books to calculate the said magnet but failed. I want to know how i calculate above magnet. Please help

Homework Equations

The Attempt at a Solution

 

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you want to calculate the strength of an electromagnet?? Try http://sci-toys.com/scitoys/scitoys/magnets/calculating/calculating.html"