The resistivity of iron is 1 xx 10^(-7) ...

The resistivity of iron is `1 xx 10^(-7)` ohm -m. The resistance of a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm-m will be

A

`1 xx 10^(-7)`

B

`2 xx 10^(-7)`

C

`4 xx 10^(-7)`

D

`8 xx 10^(-7)`

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The correct Answer is:

A

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