In: Physics
A long straight cylindrical shell has an inner radius Ri and an outer radius R0. It carries a current I, uniformly distributed over its cross section. A wire is parallel to the cylinder axis, in the hollow region (r < Ri). The magnetic field is zero everywhere outside the shell (r > R0).
We conclude that the wire:
A) is on the cylinder axis and carries current I in the same direction as the current in the shell
B) may be anywhere in the hollow region but must be carrying current I in the direction opposite to that of the current in the shell
C) may be anywhere in the hollow region but must be carrying current I in the same direction as the current in the shell
D) is on the cylinder axis and carries current I in the direction opposite to that of the current in the shell
E) does not carry any current.