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A cylindrical wire of radius R=2.3cm carries a current of I=5A uniform distributed across its cross-section....

A cylindrical wire of radius R=2.3cm carries a current of I=5A uniform distributed across its cross-section. Find an expression (i.e. a formula) for the magnitude of the magnetic field created by this current as a function of radius both inside and outside the wire. Use this expression to determine the magnitude of the magnetic field at the surface of the wire (i.e. at r=R). Denote this magnitude by Bo. Is there a radius bigger than R where the magnitude of B is 1/2 Bo ? If so, find it. If not, explain why not. Is there a radius less than R where the magnitude of B is 1/2Bo? If so, find it. If not, explain why not.

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