An engineer is manufacturing permanent magnets to be used in high-efficiency brushless DC motors for wind turbines. The magnets must retain a strong, permanent magnetic field indefinitely and resist demagnetization.
Suggest a suitable metal or alloy for these permanent magnets.
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.