alleryStart learning →How is the electron beam of a cathode ray tube aimed at a chosen point on the screen?
ABy a permanent magnet fixed behind a screen
BBy a single coil wound around the whole tube
CBy two pairs of coils, vertical and horizontal
DBy one pair of coils set at 45 degrees only
Answer & Solution
Correct answer: C. By two pairs of coils, vertical and horizontal
1. A cathode ray tube accelerates electrons from a cathode in an electron gun.
2. Magnetic fields from coils are then used to steer those electrons.
3. Two pairs of coils are used, one steering vertically and the other horizontally.
4. Two independent directions of deflection are what let the beam reach any point on the screen.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.11 More Applications of Magnetism_
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