cap sizing

[ishkabidle]

I'm designing a circuit, and I'm going to use 1020 steel for an end cap. Can someone tell me, or point me to, a way to determine the dimensions of the cap for it to be slightly less than saturated by the flux from the pole of an n35 magnet?

 

[EdStainless]

For a rough pass, take the maximum Br of your magnet, and the saturation of your steel. Assume that you will work at 85% of the steal saturation and take the ratio. That is how much you can taper the pole and still be OK.

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