MR Mik,
I can see by your questions that you need some lessons in basic electronics, and this is not the purpose of this thread. Get a good basic electronics book, and experiment with what you learn, and eventually it will all become clear.
It all gets down to ohms law.
Fully understand that formula and how op amps work, and you will understand how the value of the 4.7 M resistor will effect things.
No shortcut to understanding.
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