Inside the current carrying conductor magnetic field is zero. As seen from figure, if we assume current is flowing at distributed lines inside the coductor, the field produced by a given line of current will be cancelled due to the magnetic field produced by neighbouring line of current.

As seen from figure, if we assume current is flowing at distributed lines inside the coductor, the field produced by a given line of current will be cancelled due to the magnetic field produced by neighbouring line of current.