The diagram below shows the magnetic field lines around a horseshoe magnet, with three specific regions labeled: PPP, QQQ, and RRR.

At which of the labeled regions, PPP, QQQ, or RRR, is the magnetic flux density the greatest? Explain your answer with reference to the magnetic field lines.
Practise AQA GCSE Physics Permanent and induced magnetism, magnetic forces and fields with exam-style questions for Foundation and Higher tier. 12 questions covering Poles of a magnet and Magnetic fields, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.