Physics - Deflection of an electron beam
Deflection of an electron beam
If a charged particle enters the space between the plates from outside the
plates, and it is moving fast enough, its path will be deviated by the
electric field.  The direction and magnitude of the force do not change,
so this is similar to a mass moving through a gravitational field - it
moves in a parabolic path. This is what happens in a cathode ray
oscilloscope. Once it leaves the field, it continues in a straight line
(assuming other forces are negligible) until it hits the screen, causing a
spot of light.
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