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23 Nov 2019
A long wire is known to have a radius greater than 5.7 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 0.58 mT at a point 4.0 mm from the axis of the wire, and 0.30 mT at a point 38 mm from the axis of the wire. What is the radius (in mm) of the wire?
A long wire is known to have a radius greater than 5.7 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 0.58 mT at a point 4.0 mm from the axis of the wire, and 0.30 mT at a point 38 mm from the axis of the wire. What is the radius (in mm) of the wire?
