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Let L be the length and d be the diamete...

Let L be the length and d be the diameter of cross section of a wire. Wires of the same material with different L and d are subjected to the same tension along the length of the wire. In which of the following cases, the extension of wire will be the maximum?
L= 200 cm, d=0.5 mm
L= 300 cm, d=1.0 mm
L= 50 cm, d= 0.05 mm
L=100 cm, d=0.2 mm

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