lecture15 - Electromagnetic Waves and Polarization Physics...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

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

Unformatted text preview: Electromagnetic Waves and Polarization Physics 102: Lecture 15 HE2: Monday March 15 Material covered: lectures through 12 NOT INCLUDING AC CIRCUITS! discussions through 6 homework through 6 labs through 5 Review: Sunday March 14, 3-4:30, room 141 Will go over Fall 2009 Exam Today: Electromagnetic Waves Energy Intensity Polarization x z y E B Only the loop in the xy plane will have a magnetic flux through it as the wave passes. The flux will oscillate with time and induce an emf. (Faradays Law!!!) loop in xy plane loop in xz plane l o o p i n y z p l a n e 1 2 3 7 Preflight 15.1, 15.2 In o rde r to find the lo o p tha t de te c ts the e le c tro m a g ne tic wa ve , we s ho uld find the lo o p tha t ha s the g re a te s t flux thro ug h the lo o p. 32% 26% 42% Propagation of EM Waves Changing B field creates E field Changing E field creates B field E = c B x z y 10 If you decrease E, you also decrease B! This is important ! Preflight 15.4 Suppose that the electric field of an electromagnetic wave decreases in magnitude. The magnetic field: 1 increases 2 decreases 3 remains the same E=cB 17% 74% 8% Energy in E field 13 Electric Fields Recall Capacitor Energy: U = C V 2 Energy Density (U/Volume): u E = E 2 Ad E d E d A CV U 2 2 1 2 2 2 1 2 2 1 = = = d A E d A C o = Ed V = Energy in B field 13 Magnetic Fields Recall Inductor Energy:...
View Full Document

This note was uploaded on 01/25/2012 for the course PHYS 102 taught by Professor Lee during the Spring '08 term at University of Illinois, Urbana Champaign.

Page1 / 22

lecture15 - Electromagnetic Waves and Polarization Physics...

This preview shows document pages 1 - 8. Sign up to view the full document.

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