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## Homework Statement

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 .

## Homework Equations

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 :)