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Q.

The resistivity of iron is 1 × 10−7  ohm-m. The resistance of an 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

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a

8 × 10−7 

b

1 × 10−7 

c

2 × 10−7 

d

4 × 10−7 

answer is A.

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Detailed Solution

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

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