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Which of the Following Quantities Does Not Change When a Resistor Connected to a Battery is Heated Due to the Current? - Physics


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


  • Drift speed

  • Resistivity

  • Resistance

  • Number of free electrons

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Number of free electrons


As the resistor connected to the battery is heated, the thermal energy of the electrons increases. Thus, the relaxation time of the electrons will decrease and so will the drift velocity. Resistivity is inversely proportional to the relaxation time; thus, resistivity will increase with decrease in relaxation time. Therefore, resistance will also change. The number of electrons in a resistor will remain same.

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HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 10 Electric Current in Conductors
MCQ | Q 4 | Page 197
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