Please anyone i need help in understanding about the Op-amp!

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I have a confusion that involves the op-amp.
Both from May/June 2011
41 question no, 9 c (i)
43 question no. 9 b (ii)
Please help me understand........... I M FREAKING OUT ABOUT PHYSICS!!!!!
I have no clue how to answer those application questions......they indeed are horrible!
 
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