Magnetism and CRT's I am doing a simple science project with my
son. I accidently waived a magnet by a CRT screen and saw the
magnetic fields in colors. I want to do this experiment at the
school along with a 4th grade explanation on the reaction
between screen and magnet. Can you help? On a CRT, the picture
is drawn by three separate electron beams scanned rapidly across
the screen. Each bean is supposed to strike only one of the
three primary color phosphors on the interior of the CRT face.
The beams are guided to their proper location by the interplay
of electric and magnetic fields applied back in the area of the
CRT tube's neck. When you applied the magnet to the CRT face,
the externally imposed magnetic field distorted the aim of the
electron beams, thereby causing a mis-registration of their
intended points of impact. Older color TV sets can be
temporarily damaged by application of a magnet to the screen. No
damage will occur if the TV CRT is of the black and white style.
This is similar to the generat