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  4. Two identical p-n junctions may be connected in series with a battery in three ways. The potential drops across the two p-n junctions are equal in <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-bsber6syhzsdtoyr.jpg />

Q. Two identical junctions may be connected in series with a battery in three ways. The potential drops across the two junctions are equal in
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Solution:

In circuit 2 both the diodes are forward biased and in circuit 3 both the diodes are reverse biased.
When in forward bias both diodes will offer zero resistance(ideally) hence potential drop across it will be minimum & equal for both diodes but when both diodes are in reversed bias they will offer high resistance & hence potential drop will be maximum & equal for both.