Physics-Resistance & Resistivity
NEET Physics Resistance & Resistivity Assertion Reason Question
Type: Assertion Reason-assertion-Medium-Class 12
Assertion (A): The resistivity of metals is largely independent of temperature changes. | Reason (R): The number of free electrons per unit volume in metals does not significantly change with temperature.
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false.
Correct Answer
Option A
Detailed Explanation
The NCERT context states that in metals, the number of free electrons per unit volume (n) is not dependent on temperature to any appreciable extent, thus explaining why the resistivity of metals is largely independent of temperature changes.
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