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working of transistor in a circuit

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amangupta009

Joined Apr 13, 2011
3
In the given figure , when base voltage of Q2 is made 3.2 V then why Q1 reaches cut off and Q1 in active region and when base voltage of Q2 is made 3.5 V the why Q2 reaches active region and Q1 in cut off ??
 

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