question_answer

For a given plate-voltage, the plate current in a triode is maximum when the potential of [IIT-JEE 1985; CPMT 1995; AFMC 1999]

A)            The grid is positive and plate is negative

B)            The grid is positive and plate is positive

C)            The grid is zero and plate is positive

D)            The grid is negative and plate is positive

Correct Answer: B

Solution :

                   When grid is given positive potential more electrons will cross the grid to reach the positive plate P. Hence current increases.