Two identical p-n junctions may be connected in series with a battery in three ways, as shown in figure.
The potential drops across the two 
-n junctions are equal in
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B
In circuit 1, first p-n junction is forward biased and second is reverse biased. Their potential drops cannot be equal. In circuits 2 and 3, the two p-n junctions are connected in series, they carry equal (forward or reverse) currents. Their potential drops are equal.
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