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A thin dielectric disk with radius a has a total charge +Q distributed uniformly over its...

A thin dielectric disk with radius a has a total charge +Q distributed uniformly over its surface (Figure 1). It rotates n times per second about an axis perpendicular to the surface of the disk and passing through its center. Find the magnetic field at the center of the disk.

Find the current of the rotating ring.

Express your answer in terms of some or all of the variables Q, a, r, dr, n, and the constant π

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