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Question: The resistivity of iron is\(1 \times 10^{- 7}ohm - m\). The resistance of a iron wire of particular ...

The resistivity of iron is1×10−7ohm−m1 \times 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−mohm - m will be

A

1×10−71 \times 10^{- 7}

B

2×10−72 \times 10^{- 7}

C

4×10−74 \times 10^{- 7}

D

8×10−78 \times 10^{- 7}

Answer

1×10−71 \times 10^{- 7}

Explanation

Solution

Resistivity of some material is its intrinsic property and is constant at particular temperature. Resistivity does not depend upon shape.