An engineer suspects that several steel lock-pins removed from a magnetic clamping jig have become permanently magnetised.
Describe a simple test the engineer could carry out to determine whether a lock-pin has retained any magnetism, stating the observation that would confirm this.
30 exam-style questions on Edexcel GCSE Physics 12.1 Magnets and magnetic fields. Each one has a worked solution and a mark scheme showing where the marks go.