1. The problem statement, all variables and given/known data The figures showing the potential variation inside a PN junction normally shows the potential to be constant in the neutral P and N regions 2. Relevant equations V=Q/4ΠΣr 3. The attempt at a solution Since the potential due to the positive and negative charges should also exist in the neutral P and N region( since their electric field will definitly extend to those regions and electric field and potential are directly related); i have come up with a new figure showing how the actual variation of potential in the neutral N and P regions will take place. I have attached the figure with this thread. Figure showing the variation in potential from my textbook is also attached.