Physics P4

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Sparks

Electrons

  • An atom consists of a small positively charged nucleus surrounded by an equal number of negatively charged electrons
  • In a stable, neutral atom there are the same amounts of positive and negative charges
  • All electrostatic effects are due to the movement of electrons
  • Like charges repel, unlike charges attract
  • When a polythene rod is rubbed with a duster, electrons are transferred from the duster to the polythene, making the polythene rod negatively charged
  • When a acetate rod is rubbed with a duster, electrons are transferred from the acetate to the duster, leaving the acetate rod positively charged
  • An object has : 1) a negative charge to an excess of electrons. 2) a positive charge due to a lack of electrons
  • Atoms or molecules that

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