Aqa Electromagnetism

A permanent magnet has which properties?

• Produce their own magnetic fields

• The magnetic fiield strength can be changed

• Can attract and repel other magnets

• Can be switched off and on

Opposite poles on a magnet will

• Attract

• Repel

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An induced magnet has which properties?

• Can only attract a magnet

• Can attract and repel magnets

• Loses their magnetism when removed from a magnetic field

• Are only magnetic when in a magnetic field

• Are made of all metals

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Magnetic fields go in the direction?

• South to North

• North to South

• They don't have fields

• Downhill

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Earth's geographical north is magnetic south - True or False?

• True

• False

A coil of wire with electricity travelling through it is called a ___________________?

• Solenoid

• Solaroid

• Magnetoid

• Coiloid

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To make an electromagnet stronger you usually have what added through the middle of the coil?

• A copper core

• An iron core

• A steel core

• A plastic core

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Flemming's left hand rule tell us which 3 things?

• Direction of force

• Direction of voltage

• Direction of current

• Direction of Magnetic field

• Magnetic field strength

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What is the unit of magnetic flux density?

• Bertram

• Newton

• Tesla

• Ampere

The force exerted by a magnetic field depends on 3 things. They are...

• Total length of the wire

• Length of the wire perpendicular to the magnetic field

• Magnetic field strength

• Electron density

• Current

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