question_answer

Which of the junction diodes shown in figure is forward biased?

A)  

B)  

C)   

D)  

Correct Answer: D

Solution :

In junction p-section  n-section diode, In option [a] p-section is at -15 V and n-section at -10 V i.e., p-section is at lower potential than n-section so its reverse biased. Similarly, in [b] p-section is at + 5 V and n-section at +10 V, so reverse bias. Also, in [c] p-section is at -10 and n-section is at 0 V (earthed) so reverse bias. But in [d] p-section is at +10 V and n-section is at 0 V, so its forward bias.