In common base configuration, collector and base are reverse bias.when a negative potential is applied to the base-collector, why does that behave as if it is forward biased??Do u say that when a negative potential or voltage is appliied to a system in reverse bias...it behaves as forward biased??pls explain with reasons?????

hi murali

pls specify whether it is n-p-n transistor or p-n-p transistor

and when you apply any voltage across base and collector it actually is a diode

in case of n-p-n base acts as p and collector acts as n and vice versa in p - n - p

so when you apply a negative  voltage across base and collector it will be forward bias .

in case of n-p-n

hi murali

pls specify whether the transistor is npn or pnp configuration

and forward bias is when n is connceted to lower voltage than p and reverse bias is when n is connected to higher

voltage than p you can easily see that in diode biasing when p is connected to + voltage and n to - voltage then

it is forward bias and behaves as short circuit .