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## Homework Statement

Hi,

I've got a presentation on an experiment we did using the Helmholtz coil and I'm starting to run dry on material. As some additional applications I found that you can:

- Use the coil set up to cancel external interference (Shield other experiments? Not sure about that one.)

- Produce a more stable and uniform field when a third coil is added around the outside.

I'm struggling to find anything regarding these that may be worth talking about. Just wondering if anyone has a very brief, qualitative description of how these two effects work. It's just a small presentation so I don't want to delve into the mathematical depths; especially having gone through all the data...

Many thanks