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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The electric field across the junction of a Zener diode is very high (of the order of 5 10^6 V/m ) even for a small reverse bias voltage of about 5 V . Reason (R): Both p and n regions of a Zener diode are lightly doped, which results in a wide depletion region. In the light of the above statements

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
  2. BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
  3. CAssertion (A) is true but Reason (R) is false
  4. DAssertion (A) is false but Reason (R) is true

Correct answer

C. Assertion (A) is true but Reason (R) is false

Step-by-step solution

Assertion (A) is true. In a Zener diode, a small reverse bias voltage (e.g., 5 V ) across a very thin depletion region (e.g., Reason (R) is false. A Zener diode is heavily doped on both the p and n sides, which is exactly what causes the depletion region to be very thin, not wide. Answer: Assertion (A) is true but Reason (R) is false

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