Question

.In the following figures, diodes are either forward biased or reversed biased. Choose the following:

$P-$left diode

$Q-$right diode

• A. both $\left(P\right)$ and $\left(Q\right)$ forward biased
• B. both $\left(P\right)$ and $\left(Q\right)$ reverse biased
• C. $\left(P\right)$ is forward biased and $\left(Q\right)$ is reverse biased
• D. $\left(Q\right)$ is forward biased and $\left(P\right)$ is reverse biased

Answer 1

Answer: (C)

$\left(P\right)$ is forward biased and $\left(Q\right)$ is reverse biased

In forward bias condition, the positive terminal of battery is connected to the p-type and the negative terminal of battery is connected to the n-type.
Here, in first figure, p-type is at $+8V$ and n-type is at $2V$ i.e. p-type is more positive than n-type.
And in second figure, p-type is at $-8V$ and n-type is at $-2V$ i.e. p-type is more negative than n-type.
Hence, (P) is forward biased and (Q) is reverse biased.