Question

explain why soft iron cannot be used to make a permanent magnet​

Answer 1

Answer:

Materials for making permanent magnets should have high coercivity so that magnetisation is not erased by stray magnetic fields, temperature fluctuations or minor mechanical damages. Soft iron/pure iron has much smaller coercivity

Answer 2

Answer: As the soft Iron cannot retain the electro magnetism after electric flow is stopped in the coil wound around the soft iron soft iron not used for making a permanent magnet. so the permanent magnets are made by the magnetic substances which can retain magnetism and have more retentivity like steel.