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.
1 answer
The best argument that supports the student's claim is:
A. The current in the wire has created a magnetic field with its north pole at the top of the rod.
This supports her claim because the presence of a magnetic field between the current-carrying wire (which creates its own magnetic field) and the bar magnet (which has a north pole) would explain why the magnet is moving away from the rod. The interaction between the magnetic fields is what would cause this movement.
