Assertion ( A ): In a CRT, grid is kept at negative potential with respect to cathode.
Reason ( R ): The function of grid in an electronic tube is to control the number of electrons.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true
Share your understanding of this question with the correct explanation.