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A strong enough magnet brought close enough to the screen or to certain other parts of a television or computer monitor that uses a cathode ray tube will distort the displayed image.

This happens because a cathode ray tube image is created by shooting electrons at a phosphor-coated layer that glows where the electron stream strikes it. The stream of electrons is focused and targeted by magnetic fields within the TV tube. A strong enough magnetic field from another source will send the beam of electrons off target, distorting the image.

This does NOT happen with modern flat screen TVs and computer monitors because they do not use cathode ray tube technology to create the image.

The picture as seen on TV screen is due to moving charged particles (electrons).

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10y ago

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