How the diode will act in these situations in transition period

[electron2]

http://i30.tinypic.com/2i2r9i.gif

 

[negitron]

Is this homework or coursework?

 

[electron2]

no
i am learning circuit theory

 

[negitron]

Then, it's coursework. We won't do your work for you here; no, not even if you're trying to teach yourself. We'll certainly help you, however. Tell us what you've done so far to solve the problem and how you've gone about it. Show any relevant equations and how you've gone about attempting a solution.