Eli5: What happens when you hold a magnet up to an old crt TV?

Question

Eli5: What happens when you hold a magnet up to an old crt TV?

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Answer 1

CRT tvs used electromagnets to move an electron beam across/down the screen. Where the beam hit lit up in a certain colour for each pixel depending on what part of the pixel the beam lands on. The magnet you’re holding adds to the built in magnets and the beam lands in the wrong place activating the wrong colors.