Which of the following is the most suitable material for making the core of an electromagnet?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Soft iron
An electromagnet must be a strong magnet while the current flows and lose its magnetism as soon as the current is switched off. Soft iron does exactly this, so it is used for the core. Steel keeps its magnetism and is used for permanent magnets, and aluminium is not attracted by a magnet at all.