Figure shows a section of a very long cylindrical wire of diameter a, carrying a current I. The current density which is in the direction of the central axis of the wire varies linearly with radial distance r from the axis according to the relation J = J₀ r/a. Obtain the magnetic field B inside the wire at a distance r from its centre. - VgyanHub

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20. Figure shows a section of a very long cylindrical wire of diameter a, carrying a current I. The current density which is in the direction of the central axis of the wire varies linearly with radial distance r from the axis according to the relation J = J₀ r/a. Obtain the magnetic field B inside the wire at a distance r from its centre.

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