The lengths of two wires made of same material are 2m and 1m. Their radii are 1mm and 2mm. The ratio of their specific resistances is

2 : 1

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1 : 1

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4 : 1

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8 : 1

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Solution

The correct option is C 1 : 1
Specific resistance $ρ$ does not depend on length and radius it is the property of material.As both wires has the same material the ration is $1 : 1$

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Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare (i) their resistances, (ii) their specific resistance.

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