The magnetic flux inside a hollow conductor is zero, even if the observer is inside and the conductor is rotating, as the net effect of equal numbers of protons and electrons remains zero. However, if a current is driven around the circular conductor, the situation changes, potentially generating a magnetic field. The discussion also raises the possibility of spinning a charged tube with an imbalance of protons and electrons, which could create different magnetic effects. The presence of a DC current flowing through the conductor may further influence the magnetic field dynamics. Overall, the interaction of current and rotation in conductors is complex and context-dependent.
