Exploring Effects of Magnets on TV Screens

In summary, a student in grade 12 physics is researching the effect of placing a strong magnet on the screen of a television set. The observations include a distorted picture and a completely dark screen in the area where the magnetic field is strongest. The student is struggling to find a detailed explanation for this phenomenon and is seeking help and reputable sources for their research project. The student has provided some websites they have found but they do not fully explain the effect. The student is specifically looking for information on how a magnetic field can cause an electron to do a U-turn, which is part of a circular trajectory.
  • #1

Homework Statement

A strong magnet is placed on the screen of a television set (permanently damaging the tube). Explain the following observations.
a) the picture becomes distorted
b) the screen is completely dark where the field is strongest

Homework Equations


The Attempt at a Solution

Hi. I am in grade 12 physics and this is a research project that I have to do. I have been researching for about two hours but cannot find a website that explains what is really happening in detail (I have to write from 500 - 1000 words). So far I have found out that TV’s shoot electrons across the front of the screen or something...and when you put the magnet in front it changes the direction of the electron. I need a more detailed explanation of why this is occurring, and I also need to find out why the screen is "completely dark where the field is strongest". If anyone can help I would greatly appreciate it. If you can please post websites that I can go to to read about it because I have to source where I find my information, and I’m pretty sure (no offence to anyone that uses these forums) my teacher will say that “physics help and math help forums” is not a reputable source...even though I know it is because I’ve gotten help here many times before on questions and got them correct.

Here’s some websites I found on my own but they don’t explain the phenomenon very well.

http://howthingswork.virginia.edu/television.html [Broken]
http://www.theharmonychipstory.com/viewart.html?id=479-2 [Broken]
http://www.colorado.edu/physics/2000/tv/merging_color.html [Broken]

So yea, if you know anything about this and where to find information on it please post the websites on here. Thanks.
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  • #2
"Completely dark" means no electrons are hitting the screen there. Find out how a magnetic field could make an electron do a U-turn.
  • #3
i can't find anything on U-turns of electrons in magnetic fields
  • #4
You should be able to find something about charged particle trajectories in magnetic fields. For example circling or spiralling trajectories. A U-turn is part of a circle.

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