Question
Question: Resistivity of iron is 1 × 10<sup>–7</sup> ohm-metre. The resistance of the given wire of a particul...
Resistivity of iron is 1 × 10–7 ohm-metre. The resistance of the given wire of a particular thickness and length is 1 W. If the diameter and length of the wire both are doubled, the resistivity will be –
A
1 × 10–7
B
2 × 10–7
C
4 × 10–7
D
None of these
Answer
1 × 10–7
Explanation
Solution
Resistivity does not depend on length & cross section area.