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The current density inside a long, solid, cylindrical wire of radius a = 2.3 mm is...

The current density inside a long, solid, cylindrical wire of radius a = 2.3 mm is in the direction of the central axis and its magnitude varies linearly with radial distance r from the axis according to J = J0r/a, where J0 = 380 A/m2. Find the magnitude of the magnetic field at a distance (a) r=0, (b) r = 1.6 mm and (c) r=2.3 mm from the center.

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