How Strong Does an Electromagnet Need to Be to Lift a 10 kg Weight?

[Hansprunner]

Hello all,
I am not at all good at physics or have studied it but have been asked to build something rather peculiar.

I need to have an electromagnet which will have enough strength when activated to bring a 10 kg steel weight from above it down to meet the magnet. It would be positioned 150cm meter below the 10kg weight which is on a pivot with an armature length of 100 cm.

How can I figure out what size magnet and how many coils of copper I would need around what diameter and how many volts I need?

If anyone could help it would be greatly appreciated.

Thanks

 

[mikeph]

This is very tricky. You can calculate the magnetic field and the force required fairly easily, but to calculate the relationship between them is complicated, and will depend a lot on the geometry and the magnetic characteristics of the steel, and probably the core as well.

I'd recommend trial and error or a numerical approach.