A wire of radius 0*8cm carries a current...

A wire of radius `08cm` carries a current of `100A` which is uniformly distributed over its cross-section. Find the magnetic field (a) at `02cm` from the axis of the wire (b) at the surface of the wire and (c) at a point outside the wire `0*4cm` from the surface of the wire. Neglect the permeability of the material of wire.

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