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.
70 exam-style questions on Edexcel GCSE Physics 12.1 Magnets and magnetic fields, covering 12.1.1 Magnetic poles, 12.1.2 Magnetic materials; permanent and induced magnets, 12.1.3 Magnetic fields, and 12.1.4 Plotting compasses and the Earth's magnetic field. Each one has a worked solution and a mark scheme showing where the marks go.