Camila 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. Camila claims that a field exists between the rod and the magnet.

Question

Which argument best supports Camila's claim?

The current in the wire has created a magnetic field with its north pole at the top of the rod.
The current in the wire has created a magnetic field with its south pole at the top of the rod.
The current in the wire has created a gravitational field with its north pole at the top of the rod.
The current in the wire has created a gravitational field with its south pole at the top of the rod.

Answer 1

The argument that best supports Camila's claim is: The current in the wire has created a magnetic field with its north pole at the top of the rod.

This statement is supported by the right-hand rule, which states that if you wrap your fingers around the wire in the direction of the current, your thumb will point in the direction of the magnetic field lines created by that current. In this case, if the current is flowing in such a way that it generates a magnetic field with the north pole at the top of the rod, it can interact with the north pole of the magnet placed nearby. If the magnet moves away from the rod, it indicates that there is a repulsive force due to the similar poles (two north poles) interacting, which further substantiates the existence of a magnetic field in that region. Therefore, this argument aligns with the principles of electromagnetism.