Two wires of the same material have resistances in the ratio ` 16 : 81` and lengths in the ratio ` 1 : 4`. Compare their radii of cross-section.

Two wires of the same material have resistances in the ratio ` 16 : 81` and lengths in the ratio ` 1 : 4`. Compare their radii of cross-section.
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Two wires of the same material have resistances in the ratio ` 16 : 81` and lengths in the ratio ` 1 : 4`. Compare their radii of cross-section.
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