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Dependence of Resistance on Temperature

Which of the ...

Question

Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?

A

Drift speed

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B

Resistivity

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C

Resistance

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D

Number of free electrons

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Solution

The correct option is C Number of free electrons
Resistance, resistivity and drift velocity varies with relaxation time which is dependent on temperature.
Number of free electrons in a conductor remains invariant even if its temperature changes.Hence correct option is option D.

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