Question:
The quantities that don’t change when a resistor connected to a battery is heated due to the current are:
The quantities that don’t change when a resistor connected to a battery is heated due to the current are:
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Heating a conductor affects resistivity and resistance, but the number of free electrons (carrier density) remains constant in metals.
Updated On: May 17, 2025
- Drift speed
- Resistivity
- Resistance
- Number of free electrons
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The Correct Option is B
Solution and Explanation
- Drift speed (A) depends on current and may change with temperature.
- Resistivity (B) increases with temperature for conductors.
- Resistance (C) also increases due to its dependence on resistivity.
- Number of free electrons (D) remains constant in a metallic conductor unless ionization or material change occurs.
Therefore, the only quantity that doesn’t change when a resistor is heated is the number of free electrons.
- Resistivity (B) increases with temperature for conductors.
- Resistance (C) also increases due to its dependence on resistivity.
- Number of free electrons (D) remains constant in a metallic conductor unless ionization or material change occurs.
Therefore, the only quantity that doesn’t change when a resistor is heated is the number of free electrons.
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