Q. 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
Explanation
The correct answer is Option B: Repel electrons and thus to control the number of electrons passing through it.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.