Electromagnets Flashcards

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What is a magnetic field and how is it created?

A magnetic field is created when an electric current flows through a wire.

What is an electromagnet?

An electromagnet is a temporary magnet that produces a magnetic field when an electric current passes through a coil. The magnetic field disappears when the current stops.

How does the direction of the current affect the magnetic field in a wire?

If the current flows upwards in the wire, it produces a circular magnetic field around the wire.

What happens to an electromagnet when the power supply is turned off?

When the power supply is turned off, the electromagnet loses its magnetism.

How can you make an electromagnet stronger?

  • You can make an electromagnet stronger by:

    Wrapping the coil around an iron core.
    Increasing the current flowing through the coil.
    Increasing the number of turns of the coil.

How does a coil of wire in an electromagnet produce a magnetic field?

When current flows through the coil, the resulting magnetic field looks similar to that of a bar magnet, flowing out from the north pole and into the south pole.

Revision Notes
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