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Question
Two identical p-n junctions may be connected in series with a battery in three different ways as shown in the circuit diagrams. In which circuit diagram will the potential drop across the p-n junctions be equal?
Two identical p-n junctions may be connected in series with a battery in three different ways as shown in the circuit diagrams. In which circuit diagram will the potential drop across the p-n junctions be equal?
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Solution
The correct option is D Circuit (2) and (3)
The potential drop across p-n junction is equal when either both the junctions are forward biased or both are reverse biased. Since in the second circuit, both the p-n junctions are reverse biased, in the third circuit, both the p-n junctions are forward biased. In the first circuit, the first junction is forward biased and second junction is reverse biased.
The potential drop across p-n junction is equal when either both the junctions are forward biased or both are reverse biased. Since in the second circuit, both the p-n junctions are reverse biased, in the third circuit, both the p-n junctions are forward biased. In the first circuit, the first junction is forward biased and second junction is reverse biased.
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