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• Instructor’s weekly informal sessions:

Tu 3:30-4:20, RAS 213 ; Fri 4-5, RLM 5.104

Lecture: 11 Capacitor & Dielectrics

Capacitances of capacitors with different symmetries :

• |Parallel plate capacitor
• Spherical capacitor
• Cylindrical capacitor
• Determination of energy stored in a capacitor: General method

Effect due to the presence of dielectrics

• On E
• On V
• On U. The fixed Q case vs the fixed V case.

Capacitor net work

• Series and || connections
• The deformation rule
• Capacitor with partially filled dielectrics.

Natural flow of energy: High U to low U.

• Motion of a positive charge
• Motion of a negative charge
• Motion of a dielectric slab

Reminders:

• Instructor’s informal session’s today. See above for time and place.
• Monday class(2/11): Review unit 1. I will highlight topics covered in unit 1.
• Wed class (2/13): Begin chapter 27. A simple question on the material covered in the class may be included in midterm 1. However, HW5 will not be included in midterm 1.
• In view of the fact that next week is the “midterm-week”, HW5 will be relatively short.

Preparation for midterm 1:

• Course summary: It contains the basic formula you need to know.

§ We suggest that you use it as a check-list as you study each chapter.

§ Download page 1 of the course summary, if you have not done it.

§ A fresh course summary will be included in your exam package, it is important for you to get familiar with it prior to the exam.

• Textbook: Skim through the text. Go through figures and examples (especially the ones related to your homework problems.)
• Homework problems: Understand the physics of each problem.
• Consult your class-notes for clarification.
• Pay special attention to the in-class-review of the unit.