magnetism Flashcards
What is the name of the naturally magnetic iron ore?
Magnetite
Magnetite is a type of iron oxide that is naturally magnetic.
What is a magnet?
Produces a force of attraction
A magnet is an object that can generate a magnetic field.
What direction do lines of magnetic force travel?
From North to South
What are the lines that pass through the space surrounding a magnet called?
Magnetic Flux
Materials capable of being magnetised are called what?
Magnetic materials
What happens if two like poles are brought close together?
Repel
What happens when two unlike poles are brought together?
Attract
Which will give magnetic lines of force an easier path to travel, soft iron or air?
Soft iron
Name two types of commonly used permanent magnets.
- bar
- Horseshoe
By convention, it is considered that lines of force outside a magnet take a path from _____ to _____.
North Pole to South Pole
Materials which are easily magnetised but become demagnetised as soon as the influence is removed are what type of magnets?
Temporary magnets
When a piece of un-magnetised soft iron is placed in the magnetic field of a permanent magnet, the soft iron itself becomes magnetised. What’s this process called?
Magnetic Induction
What is another method of magnetic induction to produce a magnet?
Stroking method
What determines the strength of a magnetic field around a conductor?
Amount of current
Give some examples of how we commonly use electromagnetism.
- Generators
- Motors
- Relays
What is one method by which magnetism can be made to produce electricity?
Move magnet past stationary wire
How do we produce electricity from magnetism?
Relative movement
How do we produce a continuous source of electricity?
Maintain a continuous motion
What is the principle of the electric generator?
Through wire to move in a constant circle
