Question
A steady electric current is flowing through a cylindrical conductor.
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Answer
- The magnetic field at the axis of the conductor is zero.
- The electric field in the vicinity of the conductor is zero.
As the current is flowing through a conductor so it it is distributed only on the surface of the conductor not in the volume of the cylindrical conductor. It is equivalent to charge distribution on a cylindrical sheet for which electric field inside a conducting cylindrical sheet is always zero.
Magnetic fields at any point inside the conducting cylinder is proportional to the distance from the axis of the cylinder.
At the axis, r = 0.
This implies that field will be zero at the axis.
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