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Understanding Capacitors and Magnetism: A Comprehensive Instructor Course

Dive into the intricacies of capacitors and their applications in this detailed instructor course. Covering topics from dielectric materials to RC circuits, this course prepares you for upcoming examinations and practical lab reports. Explore key concepts of capacitance, magnetic fields, and the effects of electric fields in various materials. Engage with quizzes, discussions on magnetism, and hands-on activities to solidify your understanding. Perfect for students returning after spring break, this unit provides essential knowledge for future studies in physics.

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Understanding Capacitors and Magnetism: A Comprehensive Instructor Course

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  1. Ye olde capacitor8.3 InstructorCourse

  2. Today & Beyond • Quiz • Material on Capacitors not in the unit. • Complete the unit (9) • SPRING BREAK • RETURN • Monday – Begin Unit on Magnetism. (Bring to class) • Wednesday – EXAMINATION #2 / Bring in units 4-9 / Lab Reports Due. • Friday – Continue magnetism unit.

  3. What is the current through the 4- resistor in this circuit? a) 0.67 A b) 0.75 A c) 1.0 A d) 1.5 A e) 4.5 A Text Answer

  4. What's Happening? DIELECTRIC

  5. Polar Materials (Water)

  6. Apply an Electric Field Some LOCAL ordering Larger Scale Ordering

  7. Adding things up.. - + Net effect REDUCES the field

  8. Non-Polar Material

  9. APPLICATION OF GAUSS’ LAW

  10. We can measure the C of a capacitor (later) C0 = Vacuum or air Value C = With dielectric in place C=kC0

  11. Dielectric Breakdown!

  12. Recall the 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

  13. Let’s talk about this…

  14. 20.13 RC Circuits Capacitor charging time constant

  15. 20.13 RC Circuits Capacitor discharging time constant

  16. Stored Energy • Charge the Capacitor by moving Dq charge from + to – side. • Work = Dq Ed= Dq(V/d)d=DqV

  17. DW=DqV=Sum of strips DV

  18. Energy Density

  19. A Thunker Find the equivalent capacitance between points a and b in the combination of capacitors shown in the figure. V(ab) same across each

  20. Let’s Finish the Unit

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