Two identical bar magnets lie end to end with a narrow gap. The field lines run from left to right across the centre of the gap. The right-hand magnet is then turned end for end. Which describes the original facing poles and the new pattern in the gap?
Originally north faces south; the new lines bend away from the central gap.
Originally north faces south; the new lines run straight across the central gap.
Originally south faces north; the new lines bend away from the central gap.
Originally south faces north; the new lines run straight across the central gap.