5H30.10-Magnet and TV

5h3010magnet_and_tv_2 5h3010magnet_and_tv

Video: Watch this demo

Instructor’s video

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


  • Color Cathod Ray Tube (such as TV or monitor) that can be ruined
  • Cow Magnet or Bar 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.