Question

How can the brightness of the pattern on the screen or cathode ray tube be changed ?

• A. By changing the negative potential on grid.
• B. By changing the positive potential on grid.
• C. We can't increase the brightness
• D. None of the above

Answer 1

The correct option is A By changing the negative potential on grid.

By changing the negative potential of the grid, we can control the number of electrons per unit time or the current in the cathode ray tube which changes the brightness.