**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