A nonconducting ring of radius R is uniformly charged with
Chapter 30, Problem 56(choose chapter or problem)
A nonconducting ring of radius R is uniformly charged with a total positive charge q. The ring rotates at a constant angular speed v about an axis through its center, perpendicular to the plane of the ring. What is the magnitude of the magnetic field on the axis of the ring a distance 1 2R from its center?
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