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LBT. Magnetic Fields & Electromagnetism

'Learn Burn Tuesday'. Your weekly GCSE science workout.

· GCSE Science Notes

Present (P)

The region around a magnet where a force acts on another magnet or on a magnetic material (iron, steel, cobalt, and nickel) is called the magnetic field. 


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The following is true of magnetic fields:

  • The force between a magnet and a magnetic material is always one of attraction.
  • The strength of the magnetic field depends on the distance from the magnet.
  • The field is strongest at the poles of the magnet.
  • The direction of the magnetic field at any point is given by the direction of the force that would act on another north pole placed at that point.
  • The direction of a magnetic field line is from the north (seeking) pole of a magnet to the south (seeking) pole of the magnet.  


Analyse (A)

To help with analyses of electromagnetism, have a go at making your own and investigating the science below.

When a current flows through a conducting wire a magnetic field is produced around the wire.  


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The strength of the magnetic field depends on: 

  • the current through the wire and 
  • the distance from the wire.    


Shaping a wire to form a solenoid increases the strength of the magnetic field created by a current through the wire.  


An electromagnet is a solenoid with an iron core. 


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To make the electromagnet stronger: 

  • Increase more number of turns to the coil. 
  • Increase the flow of current through the coil. 
  • Wrap the coil around the iron piece.  
  • Increase in current or voltage. 


Electromagnets have many uses. Below shows the use of an electromagnet in an electric bell:


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Self-asses with GCSE exam questions.


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Don't forget to check your answers.


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