Let us 

The gain of a Common Source JFET amplifier is given as

$A_V=-g_mR_D$

Hence the transconductance can be calculated as

$g_m=\dfrac{-A_V}{R_D}=-0.0833$

The drain current is given by the equation

$I_D=\dfrac{V_G}{R_D}$

Voltage between gate and ground is given by the equation

$V_G=R_LI_D=360V$

Applying KVL  at the Drain  Source Junction we …