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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): When a forward-biased p-n junction diode and a reverse-biased p-n junction diode are connected in series across a DC source, the potential drop across the forward-biased diode is much greater than that across the reverse-biased diode. Reason (R): The reverse-biased diode has a wider depletion layer

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

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

Step-by-step solution

In a series circuit, the potential drop across a component is directly proportional to its resistance ( V = IR ). A reverse-biased p-n junction diode has a wider depletion layer, which results in an extremely high resistance compared to a forward-biased diode. Therefore, when connected in series, almost the entire source voltage drops across the reverse-biased diode, making the potential drop across the forward-biased diode negligibly small. Thus, the Assertion is false, but the Reason is true. Answer: Assertion (A

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