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Question

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

Pleft diode
Qright diode

15951.png

A
both (P) and (Q) forward biased
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B
both (P) and (Q) reverse biased
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C
(P) is forward biased and (Q) is reverse biased
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D
(Q) is forward biased and (P) is reverse biased
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Solution

The correct option is D (P) is forward biased and (Q) 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.

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