A student is performing an investigation in which she wraps a current-carrying wire around an iron rod. She places the north pole of a bar magnet near the top of the rod. The magnet moves away from the rod. The student claims that a field exists between the rod and the magnet.
Which argument best supports her claim?
A. The current in the wire has created a magnetic field with its north pole at the top of the rod.
B. The current in the wire has created a magnetic field with its south pole at the top of the rod.
C. The current in the wire has created a gravitational field with its north pole at the top of the rod.
D. The current in the wire has created a gravitational field with its south pole at the top of the rod