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How to magnetise something?

How to demagnetize something?

How can permanent magnets attract unmagnetized materials?

In what direction to magnetic field lines go?

What do magnetic field lines show?

What metal is usually used for electromagnets?

Why doesn't the coil have to be magnetic in an electromagnet?

What are the ways of increasing an electromagnet's strength?

What is the great thing about electromagnets?

What are the uses of electromagnets?