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  • question_answer
    The resistance of a discharge tube is:                                                                     [AIPMT 1999]

    A)  zero       

    B)     ohmic

    C)  non-ohmic

    D)      infinity

    Correct Answer: C

    Solution :

    In discharge tube, the current is due to flow of positive ions and electrons. Moreover secondary emission of electrons is also possible. So, V-I curve is non-linear, hence its resistance is non-ohmic.


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