2006-07-20 03:33:53 · 16 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Nowhere. Magnets will ruin a television.
2006-07-20 03:36:10 · answer #1 · answered by Blunt Honesty 7 · 0⤊ 0⤋
In a classical CRT telly, I can think of at least 3 places:
The loudspeaker will have at least its main magnet, and may have a second one to cancel the fringing field from the first one.
There will be a set of magnets on small rotating adjusters near the rear of the tube, used to tweak the convergence of the 3 electron beams.
There may also be a magnet used to bias a ferrite core to improve the horizontal linearity, basically by making the ferrite saturation asymmetrical.
Some of these will have been replaced by sophisticated electronics in modern sets, but there was nothing wrong with the clever magnetic tricks.
Regards, Dan.
2006-07-22 17:36:03 · answer #2 · answered by Dan M 3 · 0⤊ 0⤋
In a Cathode Ray Tube (CRT) television, magnets are used to bend the electron beam coming from the cathode so that it can be scanned over the back of the glass at the front causing fluorescence, thus forming an image on the screen.
2006-07-21 05:26:21 · answer #3 · answered by Anonymous · 0⤊ 0⤋
An electromagnet is essential to the workings of a conventional CRT television (not a flat panel). CRT stands for "Cathode Ray Tube", which is what is used to display the actual image on a TV. The TV's screen is one end of the CRT, at the opposite end of it (towards the back) an electromagnet is used to make the cathode rays (electrons in a vacuum) scan the screen and produce the image you see. The electromagnet is controlled by the TV signal so the cathode rays "sweep" the screen starting at the upper left and going right and then down creating 525 lines (the NTSC format) to produce one frame, and then repeating this 30 times per second to produce the image.
2006-07-20 10:53:20 · answer #4 · answered by Luis T 2 · 0⤊ 0⤋
in the speakers and at the back around the coil. They do exist in a TV, they are used to control the cathode rays. Its a big ol electromagnet.
The steering coils are simply copper windings . These coils are able to create magnetic fields inside the tube, and the electron beam responds to the fields. One set of coils creates a magnetic field that moves the electron beam vertically, while another set moves the beam horizontally. By controlling the voltages in the coils, you can position the electron beam at any point on the screen.
2006-07-20 10:39:58 · answer #5 · answered by Preacher 4 · 0⤊ 0⤋
In tube type TVs there is a magnet at the back of the tube that is used to focus and direct the electrons that hit the screen. The electrons cause a special coating on the inside of the screen to fluoresce.
2006-07-20 10:37:20 · answer #6 · answered by Oh Boy! 5 · 0⤊ 0⤋
The speakers will be having permanent magnets. Besides, the electron beam is deflected with the help of a coil, which is a electro magnet
2006-07-21 02:42:38 · answer #7 · answered by mkaamsel 4 · 0⤊ 0⤋
"To form a display, or image, on the screen, the electron beam is deflected in the vertical and horizontal directions either by the electrostatic effect of electrodes within the tube or by MAGNETIC fields produced by coils located around the neck of the tube."
so, there are magnetic fields, but not magnets, per se in a TV/CRT.
2006-07-20 10:40:07 · answer #8 · answered by nickipettis 7 · 0⤊ 0⤋
On the Orthocode ray which is the bit that sticks out of the back of a CRT. magnets are used to scan the sreen at 50 hz or 100 hz
2006-07-20 10:38:39 · answer #9 · answered by BackMan 4 · 0⤊ 0⤋
There are magnets in speakers for sure.
In TV, instead of being confused with all arguments,
take a metal substance and move just a bit above the parts of the TV. wherever it is attracted, you have a magnet inside :-)
simple, but effective !
2006-07-20 13:22:42 · answer #10 · answered by rahulthesweet 3 · 0⤊ 0⤋