The potential on the axis of a uniformly charged disk at 4.7 from the disk center is 150 ; the potential 15 from the disk center is 100 .
I have no idea what the equations are, I read my textbook looking for equations and I've been searching online. I don't have any notes from class because he hasn't covered this.
The Attempt at a Solution
I don't need the solution, just an equation would be beautiful! Thank you in advance :)