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The electric bell electromagnets in action

Electric Bell. Questions (1). a) What happens to the magnetic field of an electromagnet if you switch off the current?b) How is this different from a bar magnet?c) Why do you think bar magnets are sometimes called permanent magnets?Which materials could an electromagnet pick up?How could you make a very strong electromagnet? There are three things you could do..

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The electric bell electromagnets in action

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    1. The electric bell –electromagnets in action 8J Magnets & Electromagnets

    3. Questions (1) a) What happens to the magnetic field of an electromagnet if you switch off the current? b) How is this different from a bar magnet? c) Why do you think bar magnets are sometimes called permanent magnets? Which materials could an electromagnet pick up? How could you make a very strong electromagnet? There are three things you could do.

    4. Questions (2) Look at your electric bell worksheet and answer these questions: Describe the path of the current from the cell around the circuit. a) What will happen when the current flows around the electromagnet? b) What will this do to the armature? c) What materials could the armature be made of?

    5. Questions (3) Look at your electric bell worksheet and answer these questions: When the current stops: What happens to the magnetic field around the electromagnet? What happens to the armature? What happens to the contacts? The kind of switch used to in the bell is called a make and break switch. Why do you think it has this name?

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