Mosfet as Diode Connected Transistor

Before starting , check the video(link given below) for Drain current vs Gate to source potential graph for nmos in Saturation:

When the drain and gate of a MOSFET are connected together , a two- terminal device known as a "Diode-connected transistor" results.
Check the video given below for detail explanation:

You can check the video from youtube via this link:

Now , let us try to solve some numericals based on this concept:

Example 2:

Example 3:

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