Q- The current density in a cylindrical wire varies with the distance from its axis r, as j = j₀ (r/a). Hear j₀ is a constant and ‘a’ is the radius of the wire. Find

(a) Magnetic field at the axis of the wire

(b) Magnetic field at distance r from the axis of the wire.

(c) Magnetic field at the surface of the wire

(d) Current in the wire  

Solution