Two copper wires of length l and $2$ l have radii, r and $2 r$ respectively. What is the ratio of their specific resistances?

1 : 2

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2 : 1

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1 : 1

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1 : 3

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Solution

The correct option is A $1 : 1$
Specific resistance does not depend on the dimensions of the wire but is a property of the material. As both the wires are of copper, the ratio of the specific resistance will be 1: 1.

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