Can someone show me how to find Id and Vgs for the following...?

Question

The datasheet for a 2N5459 jFET shows typically Idss=10mA & Vgs(off)= - 7V(max). Using these values, determine Id for Vgs = 0V, -1V, -2V, -3V and -5V. also how would u find Gm at Vgs = -4V???? can anyone help me out?

Answer 1

for a fet, Id = Idss(1 - (Vgs / Vgs(off)) ) ^2

wat Gm you talkin 'bout?