The discussion centers on the feasibility of switching from a PhD in engineering, specifically focused on "Electromagnetic problem solving techniques and applications to power electronics," to a PhD in Physics. It highlights that once a dissertation title is established, transitioning to a different field can be challenging and may extend the duration of the PhD program. The availability of a suitable supervisor and departmental resources is crucial, as different universities may have varying capabilities to support such research. Additionally, course requirements differ between engineering and physics, necessitating the completion of new foundational courses if a switch is made. Overall, while it is theoretically possible to pursue a physics thesis on this topic, practical considerations such as departmental policies and the need for reapplication complicate the process.