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The volume current for a solid sphere of radius R and total charge Q uniformly distributed through-
out its volume that is rotating with angular velocity w = wî is
3Qwr sin 0
4т R3
J(r) =
where (r, 0, ø) are the usual spherical coordinates. Using the Biot-Savart law, compute the magnetic
field B(2) along the z-axis (both inside and outside the sphere).

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