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By increasing the temperature, the specific resistance of a conductor and a semiconductor
- a)increases for both
- b)decreases for both
- c)increases, decreases
- d)decreases, increases
Correct answer is option 'C'. Can you explain this answer?
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By increasing the temperature, the specific resistance of a conductor ...
Specific resistance is resistivity which is given by
where n = no. of free electrons per unit volume and τ = average relaxation time For a conductor with rise in temperature n increases and τ decreases. But decrease in t is more dominant than increase in n resulting an increase in the value of ρ.
For a semiconductor with rise in temperature, n increases and τ decreases. But the increase in n is more dominant than decrease in τ resulting in a decrease in the value of ρ.
For a semiconductor with rise in temperature, n increases and τ decreases. But the increase in n is more dominant than decrease in τ resulting in a decrease in the value of ρ.
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By increasing the temperature, the specific resistance of a conductor and a semiconductora)increases for bothb)decreases for bothc)increases, decreasesd)decreases, increasesCorrect answer is option 'C'. Can you explain this answer?
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