Students studying magnetic forces arranged ceramic magnet rings over a wooden dowel in different ways, as shown in Figure 1: Magnetic Force
Figure 1: Magnetic Force Image Description
On one side there are four magnetic rings (top one is yellow, then green, then blue, and the last one is red) that are all flat on the ground touching each other. On the other side, there are the same four magnetic rings, but they all appear to be floating, whilst the red one (at the bottom) is laying flat.
Which sentence should a student include when constructing an explanation of why the red magnet is not floating in Setup B in Figure 1?
The combined magnetic and gravitation forces acting on the red magnet are equal to the force that the base is applying to the magnet.
The combined magnetic and gravitational forces acting on the red magnet are less than the force that the base is applying to the magnet.
The combined gravitational force, magnetic force, and force applied by the base are acting on the red magnet in the same direction.
The combined magnetic force and force applied by the base oppose the gravitational force acting on the red magnet.