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A long wire is known to have a radius greater than 4.0 mm and to carry a current that is uniformly distributed over its cross section. The magnitude of the magnetic field due to that current is 0.38 mT at a point 4.0 mm from the axis of the wire, and 0.23 mT at a point 10 mm from the axis of the wire. What is the radius of the wire?

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