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JEE Main & Advanced Physics Semiconducting Devices Question Bank Assertion and Reason

  • question_answer
    Assertion             :       The dominant mechanism for motion of charge carriers in forward and reverse biased silicon P-N junction are drift in both forward and reverse bias.  Reason                 :       In reverse biasing, no current flow through the junction.

    A)             If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B)             If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C)             If assertion is true but reason is false.

    D)             If the assertion and reason both are false.

    E)             If assertion is false but reason is true.

    Correct Answer: D

    Solution :

                In PN-junction, the diffusion of majority carriers takes place when junction is forward biased and drifting of minority carriers takes place across the function, when reverse biased. The reverse bias opposes the majority carriers but makes the minority carriers to cross the PN-junction. Thus the small current in \[\mu A\]flows during reverse bias.


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