11-26-2021, 11:50 AM
(11-26-2021, 05:55 AM)Erik Josefsson Wrote: I would like to use my phone as a Dip circle: https://en.wikipedia.org/wiki/Dip_circle
This approach, https://twitter.com/DocWhalley/status/12...9632817152, is quite illustrative. If you turn the smartphone upside down, so that the z-compenent gets positive, the magnetic field goes from the bottom to the top of the smartphone.