A steady electric current is flowing through a cylindrical conductor.


Using Ampere’s law, the electric field due to a current carrying conductor of cross section areas is:
magnetic field,
Where,

dl is the current element,


μ0 is the permeability of free space,


i is the current flowing


R is the radius of the conductor.
At the axis,


R=0 and so no area to enclose current.


Hence, B=0 at the axis of the conductor.


Electric field in the vicinity of the conductor is zero as a minimum distance between the point and the conductor is required to have electric field at that point.
Thus, options (B) and (C) are correct options.

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