A wire of length 5 m and radius 1 mm has a resistance of 1 ohm. What length of the
wire of the same material at the same temperature and of radius 2 mm will also have
a resistance of 1 ohm.
1) 1.25 m
2) 2.5 m
3) 10 m
4) 20 m
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4) 20 m.
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