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Physics, 24.04.2020 18:02 help4068

A nonconducting ring of radius R is uniformly charged with a total positive charge q. The ring rotates at a constant angular speed ω 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 (1/5)*R from its center? (Use any variable or symbol stated above as necessary.)

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