The resistivity of iron is $1 \times 10^{- 7}$ ohm -m. The resistance of an iron wire of a 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:

1 \times 10^{- 7}

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2 \times 10^{- 7}

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4 \times 10^{- 7}

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8 \times 10^{- 7}

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Solution

The correct option is A $1 \times 10^{- 7}$
Resistivity of some material is its intrinsic property an is constant at particular. Resistivity does not depend upon shape.

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

The correct option is A 1×10−7Resistivity of some material is its intrinsic property an is constant at particular. Resistivity does not depend upon shape.

The resistivity of iron is $1 \times 10^{- 7}$ ohm -m. The resistance of an iron wire of a 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:

The correct option is A $1 \times 10^{- 7}$
Resistivity of some material is its intrinsic property an is constant at particular. Resistivity does not depend upon shape.