Question

The diagram below shows a cathode ray tube in which the arrow indicates a beam of charged particles approaching an electric field between the plates A and B. State the approximate potential difference applied between the anode and filament.

• A. 250 V
• B. 500 V
• C. 1000 V
• D. None of the above

Answer 1

The correct option is C 1000 V

Anode and filament potential should be high enough to accelerate the electrons in the electron gun. It should be in the order of ${10}^3$