I have been trying to come up with a good question for my Ib extended essay which is a 4000 words essay about any physics topic of my choice. However, with this topic I need to come up with an experiment to further investigate this topic and write up an analysis and conclusion. I am really interested in the topic magnetic force and relating to the concept of magnetic levitation trains. However, some of the topics I came up with were too easy and there is no depth to write about it later in the lab work. I was wondering if anyone can help me to come up with an experiment with a more complex relationship between variables for magnetic force? Thank you very much!