A bar magnet and a second object are hung from metal rods. The diagram below shows what happens when both objects are released. At left, rectangular box with 2 black lines running straight down from it, each to a horizontal bar magnet with the left magnet labeled N to the left and S to the right and the right magnet unlabeled. There is a gap between the magnets. At right, a rectangular box with 2 black lines running down from it, each to a horizontal bar magnet with the left magnet labeled N to the left and S to the right and the right magnet unlabeled. There is a gap between the magnets. The left magnet hangs to the left. The right magnet hangs to the right. Which best describes the object on the right? an iron bar a steel bar a bar magnet with its north pole on the left a bar magnet with its south pole on the left