The graph of potential barrier versus width of depletion region for an unbiased diode is shown in graph A. In comparison to A ,graphs B and C are obtained after biasing the diode in different ways .Identify the type of biasing in B and C and justify your answer.
B - reverse biased
In the case of reverse biased diode the potential barrier becomes higher as the battery further raises the potential of the n side.
C -forward biased
Due to forward bias connection the potential of P side is raised and hence the height of the potential barrier decreases.