Charge Interactions

Charge Interactions

1. History of Electricity

   • 624 BC
     • Thales of Miletus discovered that a yellow petrified tree resin called elektron
       • Later it was discovered it was an electrostatic phenomena

2. Concept of Electric Charge and its Interactions

   • Inside of the atoms there are charged particles that move around and form part of the nucleus.
     • valence electrons
       • materials with an extra number of electrons, while others have a lack of electrons.

3. Coulomb’s Law and Continuous Distributions

   • charges attract or repel each other but we don’t know what force they exert.
     • 1780
       • Charles Coulomb
         • designed a torsion balance experiment, in which the electric force causes torsion in a thread that is suspended from its upper end
           • used to calculate the magnitude of the electric forces.

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