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In a reverse biased diode when the applied voltage changes by 1 V, the current is found to change by 0.5 μA. The reverse bias resistance of the diode is

In a reverse biased diode when the applied voltage changes by 1 V, the current is found to change by 0.5 μA. The reverse bias resistance of the diode is Correct Answer 2 × 10<sup>6</sup> Ω

The correct answer is option 3) i.e. 2 × 106 Ω.

CONCEPT:

  • Diode: A diode is a two-terminal semiconductor device that acts as a one-way switch for current.
    • The diode allows current to flow in one direction easily and restricts current flowing in the opposite direction.
    • An ideal diode has zero resistance in one direction, and infinite resistance in the reverse direction.​​
  • Reverse bias: In reverse bias, the n-type material is connected to the positive terminal of the battery and the p-type material is connected to the negative terminal of the battery.​​​ 
    • When a diode is reverse biased, the voltage at the cathode is higher than that at the anode. Therefore, no current will flow which means that the resistance is greater.

Additional Information

  • In forward bias, the n-type material is connected to the negative terminal of the battery, and the p-type material is connected to the positive terminal of the battery.​​​ 
  • Therefore, the current will flow easily which means that the resistance is lower.
  • In forward biasing the diode operates as a conductor whereas in reverse bias the diode acts as an insulator.

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