In figure, `V_(o)` is the potential barrier across a p-n junction, when no battery is connected across the junction.

Options

A. 1 and 3 both correspond to forward bias of junction.
B. 3 corresponds to forward bias of junction and 1 corresponds to reverse bias of junction.
C. 1 corresponds to forward bias and 3 corresponds to reverse bias of junction.
D. 3 and 1 both correspond to reverse bias of junction.

Answer

B

Explanation

3 corresponds to forward bias of junction and 1 corresponds to reverse bias of junction.
When p-n junction is forward biased, magnitude of barrier potential (i.e. height of potential barrier) becomes smaller than `V_(0)`, which is seen in graph 3.
When p-n junction is reverse biased, magnitude of barrier potential becomes greater than `V_(0)`, which is seen in graph 1.
Thus, option (B) is correct.