Dielectric materials - PowerPoint PPT Presentation

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Dielectric materials

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For a given Q, V is reduced. C is increased by K. K is characteristic of the dielectric. Effect of dielectric on E ... Potential difference between the plates ... – PowerPoint PPT presentation

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Title: Dielectric materials


1
Dielectric materials
  • Their effect on capacitance.

2
What is a dielectric?
  • an insulator

3
Effect on Capacitance
  • C is increased
  • E is weakened by dielectric
  • For a given Q, V is reduced
  • C is increased by K.
  • K is characteristic of the dielectric

4
Effect of dielectric on E
  • Start w/ isolated, charged capacitor
  • constant Q
  • slide dielectric between plates
  • E Eo/K
  • C kCo
  • e K eo

5
Dielectric introduced while C connected to battery
  • battery pumps more Q to maintain constant V
  • QKQo

6
Multiple Dielectrics
  • Potential difference between the plates is the
    sum of the potential difference across each
    material.
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