EM: Electromagnets

• Physics
• Secondary Education
• Age 13

Magnetism 9.3

Electromagnets

How are you today?

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Highlights of the Day

• describe how to make an electromagnet and know that electromagnets have many applications

• Values :  Responsibility and Determination

Basic Concepts and Ideas

A material is described as _____________ if it is attracted to a magnet.

1. electric
2. magnetic
3. repulsive

Magnetic materials include the metals i_____, n_______ and c________.

Iron

Nickel

Cobalt

S_____ is another common magnetic metal. It is a mixture that contains a large proportion of iron.

Steel

Magnetic materials can be ___________. It means turned into a magnet.

1. magnetised
2. brushed
3. cut

__________ magnets have a magnetic field that is always there. You cannot switch the magnetic field off and on again.

1. Permanent
2. Artificial

One way to magnetise a magnetic material is by using "electricity". When this method is used, the magnet is called an ________________.

1. ferromagnet
2. electromagnetic

Electromagnets

Give ONE application of electromagnets in daily life.

Electromagnets

• An electromagnet is made by wrapping a wire around a magnetic material, such as iron. The wire that is wrapped around is a called a coil. The material in the middle of the coil is called the core.

Poles of an electromagnet

You can find out which pole is which in two simple ways.

• Use a magnetic compass. A magnetic compass points along magnetic field lines, so will point towards the south pole.
• Use a bar magnet with known poles. Opposite poles attract and like poles repel so, by bringing the bar magnet close to the electromagnet, you can detect which pole is which.

Give one way how you can find out which pole is in an electromagnet.

Self-survey: Rate your level of understanding and participation in this lesson.

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