Question

A steady electric current is flowing through a cylindrical conductor

• A. the electric field at the axis of the conductor is zero
• B. the magnetic field at the axis of the conductor is zero
• C. the electric field in the vicinity of the conductor is zero
• D. the magnetic field in the vicinity of the conductor is zero

Answer 1

Answer: (B), (C)

the magnetic field at the axis of the conductor is zero
the electric field in the vicinity of the conductor is zero

If a current passes through any conductor, net charge through any section is zero. hence electric field in the vicinity of the conductor is zero. hence, electric field in the vicinity of the conductor is zero. we can observe using biot and savart law that the magnetic field at the axis of the cylindrical wire will be zero .electric field at the axis of the wire cannot be zero otherwise the current through the wire cannot flow.