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.