The current density J inside a long, solid, cylindrical wire
of radius a = 3.1 mm has a magnitude that varies linearly
with radial distance r from the axis according to
J(r) = J0(r/a), where
J0=310 A/m2.

Find the magnitude of the magnetic field at (a) r = 0,
(b) r = a/2, and (c) r = a.

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