Conceptual doubt -Rotating nonconducting ring

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 http://ift.tt/OWUmgr somewhat related .But haven’t been able to understand properly.

I would be grateful if someone could help me understand this.

http://ift.tt/OWUmwH

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