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Question

# There are two wires of the same length and of the same material with radius r and 2r respectively. The ratio of their specific resistance is

A
1:2
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B
1:1
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C
1:4
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D
4:1
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Solution

## The correct option is A 1:1The resistivity or specific resistance of a material is an intensive property and it is defined as a resistance offered by a unit length and unit cross section area of that material when a fixed voltage is applied across it. so the specific resistance only depends upon temperature and material not on physical properties like size and shape.Hence B is correct option.

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