A complete summarised group of documents complete for GCSE Physics AQA 9-1. To make these Summaries I used 3 sources: The CGP revision guide, My GCSE Science Videos and Free science lessons videos. I achieved an 8 in GCSE AQA Triple Physics.
P7 Magnetism and Electromagnetism
Permanent and Induced Magnets
Intro
Magnets have two poles NORTH (red) and SOUTH (blue)
Same poles repel each other, opposite poles attract
Magnetic forces are a NON CONTACT FORCE
Magnetic Field
The region around a magnet where it will exert a FORCE on another magnet or on a MAGNETIC
MATERIAL (iron, steel, nickel, cobalt)
Plotting compass: used to investigate then magnetic field around a
bar magnet
Magnetic field lines ALWAYS point from north pole to south pole
Magnetic field is stronger where the field lines are closer together
(the poles of the magnet)
Magnetic field of the earth
South pole is at geographical north and vice versa
This is why compasses point north because they are
attracted to the south pole which is geographical north
Earth’s magnetic field is due to the core.
Permanent magnets
A magnet which produces its own magnetic field, always has the same north and South Pole
Induced magnets
Induced magnet: a material that becomes a magnet when it is placed inside magnetic field
Induced magnets are only ever attracted to PERMANENET MAGNETS
When it is removed from a magnetic field it will be demagnetised
Electromagnetism
Electromagnetism in a circuit
When a current flows through a conducting wire a magnetic field is produced around
the wire.
You can use fleming’s right hand rule to find out the direction of the magnetic field in
a wire
Strength of the magnetic field depends on:
1. Size of current
2. Distance from the wire
Solenoid
Solenoid produced by wrapping a wire in a cylinder shape lots of times
Magnetic field of a solenoid looks identical to bar magnet, its STRONG AND UNIFORM
Adding an iron core increases the strength of the magnetic field of the solenoid, this is an
electromagnet
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