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Estimating Capacitance and Stored Energy in Capacitors

This lecture covers the fundamental concepts of capacitance, focusing on how to estimate the capacitance of different configurations and the energy stored in a capacitor. Key topics include the role of dielectric mediums, fixed plate charges, and visual representations in understanding electric energy. The lecture also revisits essential figures that illustrate these concepts and provides hints for related homework problems. A preview of upcoming topics, including the magnetic field created by long wires, is included to bridge into the next chapter.

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Estimating Capacitance and Stored Energy in Capacitors

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Presentation Transcript

  1. Lecture 17 Capacitance: Computer Key Button – Estimate Capacitance: Please verify.

  2. Energy stored in a capacitor, Q, A, D Revisit:

  3. Fig(clicker) 17-1

  4. Fig(clicker) 17-1 cont. When there is E there is electric energy

  5. Dielectric Mediums For fixed plate charge Q Microscopic Picture: Examples of κ

  6. Dielectric Mediums continued... 2 limits: General κ and Q fixed:

  7. Fig(clicker) 17.2

  8. Fig(clicker) 17.3

  9. Hint on HW17-3 : 005 Hint:

  10. Where charges are all at the surface of the three shells

  11. Preview of Ch. 18: Magnetic Field due to a long wire

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