CIE A Level Physics (9702) 2019-2021

Revision Notes

10.1.1 Introduction to Electric Fields

Electric Field Definition

  • An electric field is a region of space in which an electric charge “feels” a force
  • Electric field strength (N C-1) is defined as the electric force per unit positive charge acting on a stationary point charge


Electric Field Strength, downloadable AS & A Level Physics revision notes

Representing Electric Fields

  • Electric field lines should always be drawn perpendicular to the source
    • Therefore, the lines must touch the surface of the charge
  • The field lines are directed from positive to negative
    • Therefore, the field lines must be pointed away from the positive charge and towards the negative charge


Point charges, downloadable AS & A Level Physics revision notes

How to represent electric fields around point charges

  • A uniform electric field is a field of force in which the strength of the electric force is the same throughout
  • In a non-uniform electric field:
    • The strength increases where the lines of the field are closer to each other
    • A weaker field is represented by the region where the lines of electric fields are further apart


Uniform and Non-Uniform Fields, downloadable AS & A Level Physics revision notes

Uniform and non-uniform electric fields

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