Question

Find the current through gate if the FET was given with gate to source voltage =10V and drain to source voltage =20V, the pinch off voltage was -2V and ID=2mA.

(a) 10mA

(b) 20mA

(c) 0mA

(d) 2mA

The question was asked in a national level competition.

This interesting question is from The Pinch off Voltage Vp in division Field-Effect Transistors of Electronic Devices & Circuits

Answer 1

Correct answer is (c) 0mA

Best explanation: We know that for a FET, the gate terminal is heavily doped with an insulator, resulting in infinite resistance. Hence no current flows through the gate terminal. It has no relationship with the other current parameters. It is constant for all FETs.