Two wires of the same material and length but diameter in the ratio \( 1: 2 \) are stretched by ...

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Two wires of the same material and length but diameter in the ratio \( 1: 2 \) are stretched by the same force. The ratio of potential energy per unit volume for the two wires when stretched will be:
(1) \( 1: 1 \)
(2) \( 2: 1 \)
(3) \( 4: 1 \)
(4) \( 16: 1 \)
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