Q112 / 180 · AIIMS 2016 · Physics

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

  • A
    relaxation time increases
  • B
    electron density decreases
  • Correct answer
    C
    relaxation time decreases
  • D
    relaxation time remains constant

Solution

Resistance of a conductor, $R=\frac{m}{n e^2 \tau} \frac{l}{A}$ where the symbols have their usual meaning. As the temperature increases, the relaxation time $\tau$ decreases.

Hence, the correct answer is option: 'C'.

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