Recommended by Ningbo Medical Device Magnetic Ring Manufacturers

Let the gravity of each magnetic ring be g, then when the two magnetic rings are at rest, the force between A and B is g, and the corresponding distance is h1;

When the magnetic ring C is sheathed on B and A, B and C are at rest, the force between B and C is G, the corresponding distance is h3, and the force between A and B is 2G, the corresponding distance is h2. According to the principle that the repulsion between magnetic rings increases with the distance decreasing, we can know that H 1 > H2, H2 < H3.

So choose B.