A) circuit 1 and circuit 2.
B) circuit 2 and circuit 3.
C) circuit 3 and circuit 1.
D) circuit 1 only.
Correct Answer: B
Solution :In circuit 2, both p-n junctions are in forward bias and have same resistance. Similarly in circuit 3, both p-n junctions are in reverse bias and have same resistance. Hence, in circuit 2 and 3, the potential drops across the two p-n junctions are equal. Hence, the correction option is [b].
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