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Feb29-12, 05:27 PM
HW Helper
P: 5,344
Quote Quote by Femme_physics View Post
Well, sum of all I entering that crossection I marked in red

3 -2 -I1 = 0
I1 = 1 mA

There you go.../
I believe you realise this is so not right that you need to make a fresh start.

Hint: you know V+ so determine V_.