| ASSERTION: Specific resistance is independent of cross-section of material used. |
| REASON: When the radius of a copper wire is doubled, its specific resistance gets increased. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: C
Solution :
Specific resistance is independent of the dimensions of wire. Specific resistance of wire is given by \[\rho =\frac{m}{n{{e}^{2}}\tau }\]where t is relaxation time. From this we find that the resistivity of a conductor depends upon the nature of material and temperature.
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