GCSE Physics (AQA)

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Electric Field Strength

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Electricity Static electricity

Electric Field Strength

3:10 Static Electricity and Electric Fields
Spec 4.2.5.2
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  • Closer charges result in stronger electrostatic forces.
  • Electrostatic forces occur between charged objects; like charges repel, opposite charges attract.
  • Two charged spheres, one positive and one negative, experience electrostatic attraction.
  • The force is stronger when charges are close and weaker when further apart.
  • Electric fields explain the variation in force strength with distance.
  • Electric fields weaken with distance from the charge's center.
  • An electric field is a region where charges experience electrostatic forces.
  • Field strength is indicated by the proximity of field lines; closer lines mean a stronger field.
  • Field lines represent the direction of force on a positive charge.
  • For positively charged spheres, field lines point away, indicating repulsion of positive charges.
  • Field strength is stronger near the charge where lines are close together and weaker further away where lines are apart.
  • Larger charges generate stronger electric fields.
  • A smaller charge has a weak electric field, represented by fewer field lines.
  • A larger charge has a strong field, represented by more field lines.
  • Understanding field strength changes and representation is necessary for exams.
  • Larger charges generally mean stronger fields.

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