Q.Draw the circuit diagram to plot the characteristics of n-channel JFET.

The characteristics are plotted from a test circuit that lets the gate-source and drain-source voltages be varied independently while the drain current is measured. …

[!TLDR]

The test circuit has an n-channel JFET with a variable $V_{GG}$ setting the gate-source voltage and a variable $V_{DD}$ setting the drain-source voltage, so that $I_D$ can be measured against either.

To obtain the drain and transfer characteristics of an n-channel JFET, the JFET is connected with two separate variable DC supplies. The gate is connected through a gate resistor $R_G$ to a variable supply $V_{GG}$, which fixes the gate-to-source voltage $V_{GS}$; the gate is kept reverse biased. The drain is connected through a drain resistor $R_D$ to a second variable supply $V_{DD}$, which fixes the drain-to-source voltage $V_{DS}$. The drain current $I_D$ flowing in the drain circuit is measured, and the source together with the negative ends of both supplies is tied to a common ground. By holding one voltage constant an …