Magnetic Field Inside Cylindrical Conductor

[pardesi]

why is the magnetic field just inside a cylindrical conductor with inner radii a, and outer radii b carrying a uniform current I distributed throught it's croos section just 0 inside the conductor.
I used ampere's law and that surely doesn't give 0

 

[granpa]

a current produces a magnetic field whose lines of force form circles around the wire carring the current. every loop (of field lines) must inclose a current and there is no current in the hollow part of the wire.

 

[charng]

inside the conductor

The magnetic field inside a cylindrical conductor with a uniform current distributed throughout its cross section is not zero, but it is very small. Ampere's law states that the magnetic field inside a conductor is proportional to the current and inversely proportional to the distance from the current. Therefore, as the distance from the current decreases (i.e. closer to the center of the conductor), the magnetic field will also decrease. This is why the magnetic field is very small just inside the conductor, as the distance from the current is very small.

However, the magnetic field is not exactly zero because there is still a non-zero current flowing through the conductor. Therefore, there is still a magnetic field present, just at a very low magnitude. Additionally, the shape and size of the conductor can also affect the distribution of the magnetic field, so it may not be completely uniform throughout the entire cross section.

In conclusion, while the magnetic field inside a cylindrical conductor with a uniform current may be very small, it is not exactly zero and is still present due to the current flowing through the conductor. Ampere's law is still applicable in this situation, but the magnitude of the magnetic field may be different depending on the specific conditions of the conductor.