lec4 - PEP112 Spring 2008 Prof. Svetlana Malinovskaya 28...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
PEP112 – Spring 2008 Prof. Svetlana Malinovskaya 28 January 2008 The Parallel-Plate Capacitor. Motion in an Electric Field.
Background image of page 1

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

View Full DocumentRight Arrow Icon
A Disk of Charge 2 23 / 2 0 2 / 2 1 0 22 0 2 0 1 4 () 4 1 2 1 4 i iz i N i disk z i i disk z disk z z Q E rz zQ E z E z R zR Q E z πε η ε = Δ = + Δ = + =− + = ±
Background image of page 2
A Plane of Charge Many electronic devices use charged, flat surfaces – disks, squares, rectangles, etc. These charged surfaces are called electrodes. We can often model an electrode as an infinite plane of charge. 22 0 0 0 0 1 2 2 0 2 0 2 disk z plane plane z E z R R E z E z η ε =− + →∞ = > = −<
Background image of page 3

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

View Full DocumentRight Arrow Icon
The Parallel-Plate Capacitor Two electrodes with charge +Q and –Q placed face-to-face a distance d apart are called a parallel-plate capacitor. Our goal is to find the electric field inside and outside the capacitor. The net charge of the capacitor is zero. Capacitors are charged by transferring electrons from one plate to another. The plate that gains electrons has charge –Q=N(-e).
Background image of page 4
The electric fields inside and outside a charged parallel-plate capacitor All of the charge is on the inner surfaces of the two plates. Thus plates can be modeled by infinitely-large planes as long as distance d is much less than the side of the plate.
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 16

lec4 - PEP112 Spring 2008 Prof. Svetlana Malinovskaya 28...

This preview shows document pages 1 - 6. Sign up to view the full document.

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