[PDF] Magnets & Electromagnets - The Hart School PDF

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e) simple electromagnets and magnetism The electromagnet is a special type of magnet Electromagnets only exert a magnetic force when they

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When current is removed, the magnetic field disappears One way an electromagnet differs from a permanent magnet is that you can switch an electromagnet's field

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What is the unit for Magnetic flux density? [1] Tesla (T) 35 A bar magnet has a length of 0 15m and is connected to a circuit carrying a current of

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We can use electricity to make magnets which are called electromagnets An electromagnet is a type of magnet in which the magnetic field is produced by the flow

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[PDF] Magnets & Electromagnets - The Hart School

Y8 - Knowledge organiser 8 8 – Magnets Electromagnets Magnets • A non contact force (magnetism) is experienced by metals close to a magnet

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86769_3HSC_KO_1920_Y08_Science_Autumn1_Magnets_Electomagnetspdf.pdf Y8 - Knowledge organiser 8.8 - Magnets & Electromagnets

Magnets

A non contact force (magnetism) is experienced

by metals close to a magnet. Permanent magnet: an object that is magnetic most of the time Induced magnet: a magnet that becomes magnetic inside a magnetic field.

Magnets contain poles:Magnetic fields

The area around a

magnet/ which experiences a force.

The closer the lines,

the stronger the force. Earth & Magnets

The Earth has a

magnetic core.

Compassespoint to

magnetic North and are used for navigation.

Electromagnets

Current flowing through a wire causes a

magnetic field.

Electromagnet: a non-permanent magnet

turned on and off by controlling the current through it. Solenoid: wire wound into a tight coil, part of an electromagnet Core: soft iron metal which the solenoid is wrapped around. Increasing the strength

The strength of an

electromagnet can be increased in the following ways:

Increase the number

of coils

Increase the current

Include a core in the

electromagnet. Uses of electromagnets

Used in

loudspeakers and microphones- where electrical energy is transferred into sound energy.

Electric bells:

1 2 3 4 5 6