Resistor value at the gate of a JFET

[nothing909]

Homework Statement

Referring to the diagrams below, what would a suitable value for Rg and why?

I have did a lot of research and can't get a clear answer, can someone clear it up for me?

 

[lewando]

Can you provide some specifics as to what part of your research was unclear?

Also-- you must use proper homework template, or risk thread obliteration.