Which of the following features is common to the magnetic field patterns of BOTH a single circular loop carrying steady current and a bar magnet?
a) Field lines originate at the north face (or above the loop) and terminate at the south face without re-entering the material.
b) Inside the loop or magnet the field lines are straight and parallel, indicating a uniform field there.
c) Field lines form closed loops that emerge on one side and re-enter on the opposite side.
d) The magnetic field has the same magnitude at every point that is the same distance from the center.