nagle_phys2020_fa07_lecture12

nagle_phys2020_fa07_lecture12 - Reminders Exam#1...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 15 Reminders…. • Exam #1 tomorrow (Tuesday September 24 at 7:30 pm in G1B30). • Please check out your seat assignment online. • There is a CAPA homework due on Friday (shorter). • Reading for last week Sections 17.7 – 17.11 • Reading ahead for this week All of Chapter 18. 16 Clicker Question A parallel plate capacitor is charge up (+Q on one plate and –Q on the other). The plates are isolated so the charge Q cannot change. The plates are then pulled apart so that the plate separation d increases. The total electrostatic energy stored in the capacitor? A) Increases B) Decreases C) Remains constant ----------------------------------------- -Q d QV CV C Q U 2 1 2 1 2 1 2 2 = = = 17 Where is this energy U? Answer = the electric field has energy. Energy density of E-field = . Vol U volume energy = () d A d E d A Vol CV = = 2 0 2 | | 2 1 . 2 1 v ε 2 0 | | 2 E v = Turns out work to charge capacitor is equal to energy stored. 18 What is this device? 19 Supernova instabilities National Ignition Facility at Livermore Lab 20
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 21 22 What will happen when I put the screwdriver across the capacitor?
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 3

nagle_phys2020_fa07_lecture12 - Reminders Exam#1...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online