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. What magnetic field does this ring produce at the center of the disk? Express your answer in terms of the variables Q, a, r, dr, n, and the constant and µ0, if needed. Dielectric disk. radius a. charge +Q- Ring, inner radius r. outer radius r + dr n rotations per second Bat center of disk = ?

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. What magnetic field does this ring produce at the center of the disk? Express your answer in terms of the variables Q, a, r, dr, n, and the constant and µ0, if needed. Dielectric disk. radius a. charge +Q- Ring, inner radius r. outer radius r + dr n rotations per second Bat center of disk = ?