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(C) In Circuit $1$,both $p-n$ junctions are forward-biased. Since they are identical,the potential drop across each junction is equal.In Circuit $2$,o

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Circuit $1$ and Circuit $3$

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(C) In Circuit $1$,both $p-n$ junctions are forward-biased. Since they are identical,the potential drop across each junction is equal.In Circuit $2$,one $p-n$ junction is forward-biased and the other is reverse-biased. The reverse-biased junction has a very high resistance compared to the forward-biased one,so almost the entire potential drop occurs across the reverse-biased junction. Thus,the potential drops are not equal.In Circuit $3$,both $p-n$ junctions are reverse-biased. Since they are identical,the potential drop across each junction is equal.Therefore,the potential drops across the two $p-n$ junctions are equal in Circuit $1$ and Circuit $3$.

Two identical $p-n$ junctions are connected in series with a battery in three ways,as shown below. The potential drops across the two $p-n$ junctions are equal in:

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