Ch 32: Electrostatic

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Ch 32 Electrostatic

• 2/28/07

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32.4 Conductors, Insulators, Superconductors
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Superconductors resist magnetic fields.
Superconductors are used in Maglev trains. NO
resistance means efficient use of electricity and
FAST! 310 mi/hr (500km/hr)
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32.5-6 3 ways to create charge

• Friction- rubbing moves electrons
• Ex. Fur/rod balloon/hair car/road
• Contact - conductor takes electrons from charged
  object
• Ex. metal pans on Van der Graaf
• Induction- movement of electrons on conductor
  surface to create charge without contact

Figure 32.8 pg 510
Charge is induced to move away
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32.6 Induction electroscope demo
Uncharged
Charged
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32.7 Charge Polarization
Charged Balloon
Wall (or other insulator)


Charge is polarized in non-conducting
wall Movement of charge within molecules






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32.7 Lightning- example of polarization

• Polarization in clouds due to friction (water
  and ice moving due to wind)
• Grounding of charge after polarization

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