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Question

The resistance of a metallic conductor increases with temperature due to:


A
change in carrier density
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B
change in dimension of the conductor
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C
increase in the number of collisions among the carriers
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D
increase in the rate of collisions between the carriers and the vibrating atoms of the conductor.
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Solution

The correct option is B increase in the rate of collisions between the carriers and the vibrating atoms of the conductor.
  1. When the temperature of metallic conductor increases, the velocity of free electrons increases but it also cause increase in amplitude of vibration of metallic atoms which cause some extra  resistance in the path of free electron. Hence resistance increases with increase in the temperature.


Physics

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