L32_a - ELECTROMAGNETIC WAVES(Chapter 24 in text James...

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

View Full Document Right Arrow Icon
ELECTROMAGNETIC WAVES (Chapter 24 in text) James Maxwell (1831-1879) found behaviour of E r and B r described by 4 equations equations combine to give wave equation light) of speed m/s 10 99 . 2 1 wave of speed 8 0 0 = × = = µ ε c Maxwell’s discovery showed that light is an electromagnetic wave First step was to “complete” Ampere’s law
Background image of page 1

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

View Full DocumentRight Arrow Icon
Ampere’s law before Maxwell (and so far in this course): = loop around enclosed 0 I s d B µ r r Maxwell noticed a problem: consider 2 plates charging as current flows as current flows, electric flux through surface between plates changes found that t d d E 0 Φ ε acts like a current Result: General version of Ampere’s Law: t d d I s d B E 0 0 0 Φ + = r r IMPORTANT: says that magnetic field is produced in TWO ways: around current in a wire around surface through which electric flux E + - I
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.

Page1 / 7

L32_a - ELECTROMAGNETIC WAVES(Chapter 24 in text James...

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