5H30.10-Magnet and TV

5h3010magnet_and_tv_2 5h3010magnet_and_tv

Video: Watch this demo

Instructor’s video

MIT Demo Video

Description: This demonstration shows what happens when you bring a magnet near a CRT television screen.
The magnet bends the electron beam so the electrons no longer hit the correct phosphors on the screen, which interferes with the colors and the displayed image.


  • Color Cathode Ray Tube (will not work correctly after demo)
  • Large magnet
  • Electric Magnetizer

Setup Procedure:

  1. Using the electric magnetizer, magnetize two bar magnets.
  2. Tune the TV to either a white screen or a video feed.

Demonstration Procedure:

  1. Bring the magnet near the screen and note the changes in color and screen distortions.