IGCSE: Unit 9 - Magnets and currents

What is a permanent magent?

• Always have a magnetic field around them

• Always does not have a magnetic field around them

• Become magnetic only when in a magnetic field

What is an induced magnet?

• Always have a magnetic field around them

• Become magnetic only when in a magnetic field

• North and South poles

Definition of “field” – “the region in which a ............. will act”

Why is the equator hot and the poles cold?

• Poles are colder than the equatorial region because Sunrays do fall straight on poles

• Poles are hotter than the equatorial region because Sunrays don't fall straight on poles

• Poles are colder than the equatorial region because Sunrays don't fall straight on poles

How does a compass work?

• A wooden piece is what makes a compass point north -- the small magnetic pin in a compass is suspended so that it can spin freely inside its casing and respond to our planet's magnetism.

• A magnet is what makes a compass point north -- the small magnetic pin in a compass is suspended so that it can spin freely inside its casing and respond to our planet's magnetism.

• A magnet works due to the electromagent placed within the device.

The strength of an electromagnet can be increased by doing:

• Increasing the number of coils

• Inserting an iron core

• Inserting a plastic core

• Placing it closer to the equator

Magnetic field around a bar magnet is strongest at the ........

Same poles .............. . Different poles attract.

Direction of magnetism from each pole goes from .................. to South

The main magnetic metals are ............., steel, nickel and cobalt