Electromagnetism

• Intimate relationship between electricity and magnetism
• Theory of electromagnetism developed by James Clark Maxwell
  • Deals with particles electric charges and their effects, especially when they are moving
• Electric and magnetic field changes --> trigger each other
  • Changing magnetic fields can produce electric currents
    • Changing electric fields
  • Changing electric fields can produce changing magnetic fields

Electromagnetic Waves

• Can move through a vacuum
  • The aether was made up in the nineteenth century because scientists couldn't grasp the fact that these waves can move in a vacuum
• All electromagnetic waves move at the same speed in empty space
  • The speed of light
  • Fastest possible speed in the Universe
  • Since they move at the same speed, wavelength and frequency are related

Physics