Two wires of the same material and length have the radii of their cross-section are $r$ and $2 r$ respectively. The ratio of their resistances

1 : 1

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4 : 1

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1 : 4

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3 : 2

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Solution

The correct option is B $4 : 1$
The correct option should be B

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Similar questions

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.

There are two wires of the same length and of the same material and radii r and 2r . The ratio of their specific resistance is

1 : 2

R, 2 R

3 R

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