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16.1 Static Electricity

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16.1 Static Electricity Why do you sometimes get a shock when getting out of your car? Why do your clothes stick together when removed from your dryer? – PowerPoint PPT presentation

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Title: 16.1 Static Electricity


1
  • 16.1 Static Electricity
  • Why do you sometimes get a shock when getting out
    of your car?
  • Why do your clothes stick together when removed
    from your dryer?
  • Electric charges are () or (-)
  • Like charges repel and opposite charges attract
  • Most objects are neutral What if they were not?
  • The total amount of charge is conserved in any
    process

2
  • 16.2 Electric Charge in the Atom
  • Which charges are transferred between objects?
  • Atomic structure
  • Objects usually leak charges after a short time.
    Why?

3
  • 16.3 Insulators and Conductors
  • Conductors metals, fluids containing ions
  • Insulators wood, plastic, rubber
  • Semiconductors silicon, germanium

4
  • 16.4 Induced Charge
  • Transfer of charge by contact or induction
  • Electroscope

5
  • 16.5 Coulombs Law
  • Experiments show that
  • 1. force product of the charges
  • 2. force 1/(separation of charges)2

6
  • 16.5 Coulombs Law
  • Unit of charge is coulomb (C)
  • Elementary charge (e 1.602 x 10-19 C)
  • Charge is quantized
  • k 9 x 109 Nm2/C2
  • Coulombs law applies to two point charges at
    rest.
  • Principle of superposition

7
  • 16.6 Coulombs Law and Vectors
  • Review sections 3.2 - 3.4, 4.9
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