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Capacitors & Review

Join us for a comprehensive review of capacitors followed by a problem-solving session. Don't miss the upcoming examination!

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Capacitors & Review

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  1. Capacitors & Review February 8, 2010

  2. What’s Up Doc? • Today • Complete Capacitors – Try to finish in first hour • Review Session • Problem Session immediately after class • Wednesday • EXAMINATION #1 • Friday • Begin next chapter • NO PROBLEM SESSION Friday or Monday (No material to cover yet.)

  3. Quick Click: Two plates of a capacitor have a potential difference V across them. The separation between the plates is “d”. The electric field in the gap is: • Vd • V/d • d/V • Can’t tell • Hey- I don’t start reading this stuff until Tuesday night!

  4. Capacitors • Last time we showed that the work to move a charge across the gap was qV • This is also equal to the force times the distance or qEd. • qEd=qV • Ed=V • E=V/d

  5. Capacitors

  6. More C Capacitance is only a function of geometry! How does your data compare???

  7. The first experiment – • Voltage across C seemed to drop rather than stay stable. • You were given a second capacitor and it held it’s value. • What’s going on??? • meters have resistors of 1-10MW

  8. NOW GET TO WORK!

  9. REVIEW SESSION We stop at the end of the hour. Problem session – after this review. Anyone may attend.

  10. Charge • Two kinds of charge • Positive • Negative • Like Charges Repel • Unlike charges attract • Methods of exchanging charge • Contact/Transfer • Polarization/Induction etc. • Read Textbook and Activity Sheets

  11. CHARGE • Materials • Conductors – Negative charges can move around due to other charges that are present • Insulators Balloon Physics

  12. Coulomb’s Law

  13. the electric field

  14. the capacitor structure • Important Application • s=q/A • E=s/e0 • V=? • C=q/V • KE & Dv THE REAL DEAL

  15. what happens

  16. field lines

  17. what can you learn from this?

  18. louseygaussey

  19. Potential • Review from 2053 • Potential Energy • Conservation of Energy • New Concept: Electrical Potential • Work necessary to bring a unit charge from a reference level to the point in question • Reference level is usually placed at a convenient point • For point charges – reference level is most convenient at infinity. • But consider the following …..

  20. x E ☻ unit charge Zero Potential(x)= (q=1)Ex=Ex

  21. equipotentials

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