Hello everyone! I'm in my first year of my bachelor in physics and astrophysics at Leiden University, The Netherlands. We have to perform a small experiment were we use a transducer to measure a logarithmic correlation between two certain quantities. As an example our prof. said you could measure light intensity as a function of time with a photodetector. Every group has a different transducer. Me and my partner have to work with a magnetic field detector (GMR), but the problem is that we cannot think of a quantity that has a logarithmic relation to the magnetic field. I did some research, but I couldn't find anything that matches our needs (we only have four hours to do the experiment itself, we have more time for the analysis of the data) Does anyone of you have any suggestions? thanks alot! PS I am new to this forum but I already love it!