Question: A current I is uniformly distributed over the cross section of a long, straight wire of radius 1.40 mm. At the surface of the wire,

A current I is uniformly distributed over the cross section of a long, straight wire of radius 1.40 mm. At the surface of the wire, the magnitude of the magnetic field is B = 2.46 mT. Find the magnitude of the magnetic field at

(a) 2.10 mm from the axis and

(b) 0.60 mm from the axis.

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