What happens to BJT when base current is zero?

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Who can explain what happens (in terms of electrons) what happens when base current is zero, especially why current flowing to collector is zero under this condition?
 
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Hi KUstudent. Kansas University? Anyway, welcome to Physics Forums.

I always like to use this as a good image reference for this question.
tran10.gif

For more, check out their pages starting here:
http://hyperphysics.phy-astr.gsu.edu/hbase/solids/trans2.html"
 
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