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Electrostatics Ch. 20

Electrostatics Ch. 20. Electrical Charge. Positive – protons Negative – electrons Only electrons jump from one object to another. Positive Charge – loss of electrons Negative Charge – gain of electrons Like charges repel Opposite charges attract. Polarization.

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Electrostatics Ch. 20

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  1. Electrostatics Ch. 20

  2. Electrical Charge • Positive – protons Negative – electrons • Only electrons jump from one object to another. • Positive Charge – loss of electrons • Negative Charge – gain of electrons • Like charges repel • Opposite charges attract

  3. Polarization Separation of Charges

  4. Charging By Conduction • Charging a neutral body by touching it with a charged body

  5. Charging By Induction • Charging of an object without touching it

  6. Insulators – materials through which charges will not easily move • Conductors – materials through which charges will easily move

  7. Coulomb’s Law • The force between 2 charges is proportional to the size of the charges and inversely proportional to the square of the distances. • F= k(qAqB/d2) • k = constant = 9.0 x 109 N.m2/c2

  8. SI unit of charge is the Coulomb (c) • 1 coulomb is the charge of 6.25 x 1018 electrons or protons • 1 electron = -1.6 x 10-19 C • A lightning bolt is about 10 coulombs

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