Okay so this might sound kinda stupid but I'm new to electrostatics and I was doing a question that asked me to find the potential difference between two points . Now I calculated the potential at the various points previously and the question asked ' what is the potential difference between a and b'
Potential at a = -900 J/C Potential at b = 1928.57 J/C
My question is which one do I minus from which ( like a- b) or other way around ?