CUET · PHYSICS · PYQ PAPER 2023
A metallic conductor connected to a battery is heated due to the passage of current. The quantity which does not change is :
- A Resistance
- B Resistivity
- C Number of free electrons per unit volume
- D Drift speed of electrons
Answer & Solution
Correct Answer
(C) Number of free electrons per unit volume
Step-by-step Solution
Detailed explanation
In a metallic conductor, the number of free electrons per unit volume \((n)\) is a constant characteristic of the material and does not change with temperature. In contrast, heating increases resistivity and resistance while decreasing drift speed due to more frequent lattice…
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