When a weight of 10 kg is suspended from...

When a weight of `10 kg` is suspended from a copper wire of length 3 metres and diameters `0.4 mm`, its length increases by `2.4 cm`. If the diameter of the wire is doubled, then the extension in its length will be

9.6 cm

4.8 cm

1.2 cm

0.6 cm

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