question_answer

In the following circuit of PN junction diodes\[{{D}_{1}}\], \[{{D}_{2}}\] and \[{{D}_{3}}\] are ideal then I is

A) \[E/R\]  

B) \[E/2R\]

C) \[2E/3R\]           

D) Zero

Correct Answer: A

Solution :

[a] Diodes \[{{D}_{1}}\]and \[{{D}_{3}}\] are forward biased and \[{{D}_{2}}\] is reverse biased so the circuit can be redrawn as follows. \[\Rightarrow i=\frac{E}{R}\]