Christoph Holz from the University of Münster has just added a fascinating new experiment to our Wiki: Hysteresis curve of an iron core.
He has created a phyphox experiment file which allows you to measure a hysteresis curve of a coil with an iron core using your phone’s magnetometer. In order to measure it as a function of the current through the coil he uses a simple method that could certainly be applied to other experiments as well – He simply uses a second coil without an iron core, which produces a magnetic field on another axis of the magnetometer, which is proportional to the current.
This is the first extensive contribution to our Wiki and this is exactly how the Wiki is meant to be used. If you have an experiment you would like to share, simply create a user account and start adding your article/experiment/note to the Wiki. Even if it is just a small contribution, we will welcome it glady.