My question is if I use a cone shaped pole piece to focus the flux to a smaller area over the gap can I pretty much divide the larger area by the new smaller area to get a value >1 and multiply that by the value I would have gotten across the same size gap with the larger area to find my new Bg?

Also, how much, if any, will the pole piece help with uniformity?

Hope this is clear

Thanks for any help

-Todd Massure