1. The problem statement, all variables and given/known data Consider a non conducting ring of radius r and mass m which has a total charge q distributed uniformly on it.The ring is rotated about its axis with an angular speed ω. a)Find the equivalent electric current in the circuit. b)Find the magnetic moment μ of the ring. 2. Relevant equations 3. The attempt at a solution I know how to solve this problem .But I am finding it difficult to understand whether a rotating charge actually constitutes a current.If we consider any cross section of the ring then it looks like charge passes through it.But the cross section itself is moving . I found a thread https://www.physicsforums.com/showthread.php?t=187946 somewhat related , especially post#5 by DaleSpam .But haven't been able to understand properly. I would be grateful if someone could help me understand this.