Question

In an electron gun the control grid is given a negative potential relative to cathode in order to

• A. Decelerate electrons
• B. Repel electrons and thus to control the number of electrons passing through it
• C. To select electrons of same velocity and to converge them along the axis
• D. To decrease the kinetic energy of electrons

Answer 1

The correct option is B Repel electrons and thus to control the number of electrons passing through it

You must know the working of an electron gun.
In an electron gun the control grid is given a negative potential relative to cathode in order to repel electrons and thus to control the number of electrons passing through it.