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In the given circuits (a), (b) and (c), the potential drop across the two junctions are equal in:
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Both circuits (a) and (c)
In circuit(a), both p-n junctions are in forward bias, hence current will flow and potential drop will be equal.
In circuit(c), both p-n junctions are in reverse bias and hence negligible current will flow through the circuit and potential drop will be equal.
In circuit(b), one p-n junctions is in reverse bias and one in forward bias. So, they will show different resistances. Also, negligible current will flow through the circuit. Hence, potential drop will be different.
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