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A material 'B' has twice the specific re...

A material 'B' has twice the specific resistance of 'A'. A circular wire made of 'B' has twice the diameter of a wire made of 'A'. Then for the two wires to have the same resistance, the ratio `l_(B)//l_(A) `of their respective lengths must be

A

`1/4`

B

2

C

1

D

`1/2`

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