On increasing the temperature of a conductor, its resistance increases because

On increasing the temperature of a conductor, its resistance increases because

  1. A

    relaxation time decreases

  2. B

    mass of the electrons increases

  3. C

    electron density decreases

  4. D

    relaxation time increases.

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    Solution:

    Resistance of conductor depends upon relaxation time as R1τ. With rise in temperature rms speed of free electrons inside the conductor increases, so relaxation time decreases and hence resistance increases.

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