Q93 / 120 · VITEEE 2007 · Physics

Two identical P-N junctions are connected in series in three different ways as shown below to a battery. The potential drop across the P-N junctions are equal in Figure

  • Correct answer
    A
    in circuits 2 and 3
  • B
    in circuits 1 and 2
  • C
    in circuits 1 and 3
  • D
    in none of the circuit

Solution

If the p-n junctions are identical, then their resistances would be same. In circuit 1 , the first p-n function is forward biased and second is reverse biased. Hence the voltages across them would be different. In circuit 2 both are reverse biased. So potential drop would be same. In circuit 3 both are forward biased; again voltages would be same.

Hence, the correct answer is option: 'A'.

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